Straight through exhaust

timo27 · 1 Straight through exhaust Mon Jul 22, 2019 1:36 pm

timo27

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Hi all, what do we think could be the long term damage from fitting a straight through exhaust, i've fitted a 4 into 1 collector and a china made stainless slip on to my k100rs 1988, you back off and it can back fire like a gun going off, i can fix this with a small baffle, i love the improvement on the looks and i dont mind the sound level i'm just worried i might be damaging the valves???????????

Laitch · 2 Re: Straight through exhaust Mon Jul 22, 2019 2:28 pm

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The only effect might be that because you don't mind the sound level, onlookers might view you as an inconsiderate, dimwitted novice when you ride among the general public and traffic with your ear-splitting moto but that is easily reversed by remounting a silencer. Your slip-on won't help the engine but probably won't damage it either.

Last edited by Laitch on Mon Jul 22, 2019 9:11 pm; edited 1 time in total

timo27 · 3 Re: Straight through exhaust Mon Jul 22, 2019 2:43 pm

timo27

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So helpful thankyou. Oh and i do like this bit ''dimwitted novice''

Laitch · 4 Re: Straight through exhaust Mon Jul 22, 2019 3:46 pm

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duck · 5 Re: Straight through exhaust Mon Jul 22, 2019 5:25 pm

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Loud pipes save egos.

Dai · 6 Re: Straight through exhaust Mon Jul 22, 2019 6:42 pm

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I'd dump the pipe, if only because you're subject to the BSAU 193/1983 standard (ironically I'm not, as the Motorcycle Noise Act 1987 does not apply to Northern Ireland) which restricts you to 87dba. It's an MOT failure, you can be pulled by Mr.Plod and you can be fined for excessive noise. How likely the latter is likely to happen is open to debate...

https://publications.parliament.uk/pa/ld200304/ldlwa/40525wa1.pdf

kioolt · 7 Re: Straight through exhaust Mon Jul 22, 2019 7:18 pm

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The louder the pipe the smaller the d**K.

caveman · 8 Re: Straight through exhaust Mon Jul 22, 2019 8:07 pm

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kioolt wrote:The louder the pipe the smaller the d**K.

Hay!
I would bet I have one of the smallest d**ks around and I still like to have a reasonably quite exhaust?

Rick G · 9 Re: Straight through exhaust Mon Jul 22, 2019 9:06 pm

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If you do not wish to be seen as an inconsiderate, dimwitted novice don't behave in a manner which makes you indistinguishable from one.

Point-Seven-five · 10 Re: Straight through exhaust Mon Jul 22, 2019 9:24 pm

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Not only is a loud exhaust rude and inconsiderate of others, but the lack of back pressure in the exhaust system, unless compensated for in the tuning of ignition timing and mixture, results in a lot of heat stress on exhaust valves(burning) and less fuel efficiency(power output vs. fuel consumed).

The engineers have done a very nice job of optimizing engine output and longevity with the stock system. Why not take advantage of their work? It's seldom that modifications to the exhaust improves any aspect of engine performance. Dyno tests have shown that for years.

timo27 · 11 Re: Straight through exhaust Tue Jul 23, 2019 1:25 am

timo27

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Thanks for all the constructive comments and help, i'll measure the decibel level later today with said baffle (db killer) fitted. Just to give you an idea this k will be used for light green laning (off roading) so the low level 20kg lump had to go. It will be used on the road for the odd commute to work and between lanes.
So back to the original question do we think a change from the standared exhaust could do damage to the valves? i understand changing anything from the manufactures standard will affect performance ie back pressure and scavenging, i very much doubt i'm the only person to have removed the standard exhaust, again my question is - has it caused any issues?
Oh and to rub salt into the wounds - i've removed the center stand as it was collecting to much dirt and fitted enduro tires - and yes i know i'm going to burn in hell for this.

Dai · 12 Re: Straight through exhaust Tue Jul 23, 2019 6:53 am

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timo27 wrote:Oh and to rub salt into the wounds - i've removed the center stand as it was collecting to much dirt and fitted enduro tires - and yes i know i'm going to burn in hell for this.

Seriously though, a noisy pipe when greenlaning is really not a good idea. Ask the TRF (Trail Rider Fellowship). There were severe problems back in the Nineties when various self-interest groups tried very hard to get trail bikes banned from green lanes (non-asphalt roads for anyone else) even though legally the bikes (and cars) were allowed on them. Those self-interest groups almost suceeded and noisy exhausts was one of the weapons they used. They're still trying (particularly a small but unfortunately very vocal minority of the horsey crowd) - a noisy exhaust becomes a good supply of ammunition.

caveman · 13 Re: Straight through exhaust Tue Jul 23, 2019 7:29 am

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timo27,
I don't think your going to burn in hell for trying to convert K bike into somewhat of a duel sport type bike. I'm just plain lazy I would just get something more suitable for the job and easier to pick up out of the mud. But in the end to each his own, good luck!

timo27 · 14 Re: Straight through exhaust Tue Jul 23, 2019 7:46 am

timo27

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At 2000rpm its 74db at 3000rpm its 78db, thunder kicks in at 120db so it's not too loud, so any advise on the original question ?

Rick G · 15 Re: Straight through exhaust Tue Jul 23, 2019 9:46 am

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You will increase the risk of valve damage to answer your question.

timo27 · 16 Re: Straight through exhaust Tue Jul 23, 2019 10:05 am

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Thank you Rick

Laitch · 17 Re: Straight through exhaust Tue Jul 23, 2019 11:34 am

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I endorse the conversion of a moto into any kind of contraption that its owner desires; furthermore, I understand that employing a travel squad of trumpeting heralds to announce a distinguished rider's presence in the vicinity is beyond the reach of most people.

timo27 · 18 Re: Straight through exhaust Thu Jul 25, 2019 6:59 pm

timo27

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RicK G wrote:You will increase the risk of valve damage to answer your question.

just purchased a remus typ125 2031 so i guess this should have the correct set up, slip on style so still raised.

Dai · 19 Re: Straight through exhaust Fri Jul 26, 2019 2:03 pm

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That should solve all problems.

timo27 · 20 Re: Straight through exhaust Fri Jul 26, 2019 6:02 pm

timo27

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Laitch wrote:I endorse the conversion of a moto into any kind of contraption that its owner desires; furthermore, I understand that employing a travel squad of trumpeting heralds to announce a distinguished rider's presence in the vicinity is beyond the reach of most people.

Not sure what on earth you are on about mate but thanks.

timo27 · 21 Re: Straight through exhaust Fri Jul 26, 2019 6:42 pm

Fri Dec 20, 2013 3:34 am

Rick G · 22 Re: Straight through exhaust Fri Jul 26, 2019 9:15 pm

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I did do something about it and removed it and my hearing returned to normal soon afterwards.
That so called muffler has been sold on quite a few times since.
The K75 I am now riding has a staintune that is much quieter but still too intrusive for my comfort but maybe I am just getting old and cranky.

Point-Seven-five · 23 Re: Straight through exhaust Sat Jul 27, 2019 9:20 am

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Those aren't admiring looks you are getting from the people you pass when you're running with loud pipes. In most cases the first word springing into their mind is "asshole".

But, hey, it's your bike.

Laitch · 24 Re: Straight through exhaust Sat Jul 27, 2019 9:52 am

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timo27 wrote:

RicK G wrote:If you do not wish to be seen as an inconsiderate, dimwitted novice don't behave in a manner which makes you indistinguishable from one.

Rick G please dont take this the wrong way but i'm not dimwitted and the above is your quote.

That isn't a personal criticism; it's a proverb. Smile

timo27 · 25 Re: Straight through exhaust Sat Jul 27, 2019 4:40 pm

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Laitch wrote:

timo27 wrote:

RicK G wrote:If you do not wish to be seen as an inconsiderate, dimwitted novice don't behave in a manner which makes you indistinguishable from one.

Rick G please dont take this the wrong way but i'm not dimwitted and the above is your quote.

That isn't a personal criticism; it's a proverb.

Do to others as you would have them do to you

caveman · 26 Re: Straight through exhaust Sat Jul 27, 2019 9:14 pm

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Many of times I'm being an ass hole and it helps when someone points it out to me. You know the proverb thing works both ways.

Laitch · 27 Re: Straight through exhaust Sun Jul 28, 2019 1:34 am

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A stitch in time saves nine. Don't sleep under a coconut palm on a windy day. Snowflakes have a hard time in Hell.

MartinW · 28 Re: Straight through exhaust Sun Jul 28, 2019 2:26 am

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Softly softly catchee monkey. The oxen is slow but the Earth is patient. Don't try to paddle up a creek in a barb wire canoe without a paddle or even with a paddle. Do or do not there is no try.
Regards Yoda.

moriarti · 29 Re: Straight through exhaust Sun Jul 28, 2019 7:50 am

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The standard exhaust on the K is what gives the Ks that stealth like sound on approach soft yet crisp,changing to that whistle sound as it glides effortlessly by,leaving onlookers aghast by the sheer beauty of the Flying Brick as it disappears down the road.After 34 years of use and NEVER been taken off meaning its now welded itself together has absolutely nothing to do with my opinion on this matter. Straight through exhaust 44271

Woodie · 30 Re: Straight through exhaust Sun Jul 28, 2019 8:32 am

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"The standard exhaust on the K is what gives the Ks that stealth like sound on approach soft yet crisp,changing to that whistle sound as it glides effortlessly by,leaving onlookers aghast by the sheer beauty of the Flying Brick as it disappears down the road."

Hear hear! I tip my glass to you, good sir Laughing

Point-Seven-five · 31 Re: Straight through exhaust Sun Jul 28, 2019 2:17 pm

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moriarti wrote:The standard exhaust on the K is what gives the Ks that stealth like sound on approach soft yet crisp,changing to that whistle sound as it glides effortlessly by,leaving onlookers aghast by the sheer beauty of the Flying Brick as it disappears down the road.After 34 years of use and NEVER been taken off meaning its now welded itself together has absolutely nothing to do with my opinion on this matter.

Very nicely stated!

K75cster · 32 Re: Straight through exhaust Fri Aug 02, 2019 6:38 am

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I still don't understand Tino27, a Greenlander is a sort of motocrosser? Would those straight through be low pipes or were you planning to upsweep them. Same goes for the Remus is it up near the top frame tubes or low down.

One would expect a knobbly tyred K100 to throw clods of dirt from this paddock to the next? Is that what you are planning?

I've seen a few K75's changed over to GS type things and always thought the old XL350 Honda style pf pipe, like from 1974 would be neat. They ran the muffler up the back of the rear triangle and seemed a neat bike.

Yeah so straight throughs were ending in one pipe yes?? 4 into1's??

timo27 · 33 Re: Straight through exhaust Mon Aug 12, 2019 3:00 pm

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Point-Seven-five wrote:Those aren't admiring looks you are getting from the people you pass when you're running with loud pipes. In most cases the first word springing into their mind is "asshole".

But, hey, it's your bike.

You need to read all the posts point-seven-five.
remus typ125 2031 no louder the standard, slip on and 30 deg. incline.

92KK 84WW Olaf · 34 Re: Straight through exhaust Mon Aug 12, 2019 4:34 pm

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I have some mixed thoughts on this.

My K1100LT decided to crack the headers as they all do. Now when I took it home it was so silent I loved it. As quiet as the other Ks it was joining.

But it split, and for various reasons took time to get at it. But the most immediate effect was that in town pedestrians would walk out in front of me all the time.

Wisdom in the sense that a replacement used one was going to be expensive, and also likely to do the same thing.

So a Remus went on. Not particularly noisy but much more oomph in noise terms than the standard one. Now no issue with pedestrians walking out so a happy camper. Its done 18 months on it now. I go through a tunnel most days and what a sound.

But recently a relatively unused early K100RS has come. Stock exhaust and I just absolutely love the silence and turbine like sound. Would I change it? No. The sound of the stock pipe turns heads too.

I live rural and have happy horses in the fields around me, a riding school next to me. Would I recommend a noisy bike near green lanes, never. I have horses up and down past me all day, never an issue at all with anyone. We all exist together without a bother. Yes, if I meet a horse coming up the road toward me I pull over and kill the engine and without fail always a thank you.

MartinW · 35 Re: Straight through exhaust Mon Aug 12, 2019 5:15 pm

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A cop in the US found the cure for the cracking header pipes. They used to put a large jubilee clip around the four header pipes back from the muffler I think about 6"-8". It apparently changes the frequency of the exhaust resonance that was the cause of the cracking.
Regards Martin.

MartinW · 36 Re: Straight through exhaust Mon Aug 12, 2019 5:44 pm

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I found the picture of the cure.

Point-Seven-five · 37 Re: Straight through exhaust Tue Aug 13, 2019 1:36 am

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I had a Remus exhaust on my first K100RS16V when I got it.

I don't know much about the other models in the Remus line, but mine was embarrassingly noisy, especially so in the lower gears riding in town. I sold it and replaced it with a stock K100 2v exhaust which worked a treat after a bit of fiddling to get it to fit the mounts. Had 20,000 trouble-free miles with that pipe until the bike was totaled in an accident.

jbt · 38 Re: Straight through exhaust Thu Aug 22, 2019 2:06 pm

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As a potential damage, you could also receive, if you pass on the road near my house, and depending of my mood at the moment:
- biker friendly congratulations
- random slugs
- a bucket of cold water
- a bucket of boiling water
- a fistfull of small rops
- a fisfull of mid-size rops
- one big heavy rock (don't like this as I have to aim too precisely compared to rops)
- my cat
- my wife
- all my family together with rops and slugs in the pockets plus a boiled wet cat.

Noise sucks.

timo27 · 39 Re: Straight through exhaust Thu Aug 29, 2019 12:41 pm

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Straight through exhaust 69691368_10219966977430224_404705654381477888_o.jpg?_nc_cat=103&_nc_oc=AQmxmgra2WsiVFdH-w8kC8u9HcLqNDTF6jkr_m1n-WKV8HV1PSfb2mJh40ExSznXF88&_nc_ht=scontent.fman2-1

timo27 · 40 Re: Straight through exhaust Thu Aug 29, 2019 12:49 pm

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So the Remus is a little louder than standard but you dont here it over wind noise, performance hard to say i would think no difference.
So we all now know no one likes loud exhausts Straight through exhaust 259495

we also know that no one reads the entire thread Straight through exhaust 797640

as for answers/advice to the original question - ONE - Straight through exhaust 212902

Laitch · 41 Re: Straight through exhaust Thu Aug 29, 2019 12:56 pm

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timo27 wrote:as for answers/advice to the original question - ONE -

There were at least three—starting with my first post—but who's counting? Straight through exhaust 652573

GF Wollongong · 42 Re: Straight through exhaust Fri Aug 30, 2019 9:17 am

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Okay, so he wants noisier exhaust system. And maybe it is "less social".

Don the anorak and give the Harley tossers grief, or the Ducati owners or the Guzzi Mk 111 etc etc.

Loosen the collar fellas and reflect on those times you had a smile from ear to ear as you roared down the road. The aural component is such a central element to so much of motorcycling.

And yes, the weekend warriors in their leather... astride the noisy chrome do give me the shits.

GF

Last edited by GF Wollongong on Fri Aug 30, 2019 5:21 pm; edited 1 time in total

Laitch · 43 Re: Straight through exhaust Fri Aug 30, 2019 9:28 am

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GF Wollongong wrote:Okay, so he wants noisier exhaust system. And maybe it is "less social".
But do we have to carry on like a pack of righteous Sunday christians showering cliched emojis like confetti?

I don't know about you but I do, if just one person can constitute a pack. Thanks for asking. cheers

moriarti · 44 Re: Straight through exhaust Fri Aug 30, 2019 12:12 pm

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Pardon me whilst i loosen my clerical collar,Would we contemplate fitting aftermarket Dunstall
reverse megas to the starship intergalactic spacecraft,(otherwise know as the K Series) No?
That is precisely the point one cannot improve perfection that is the K.Call me an old fart call
me old fashioned,but if you want a screaming machine buy an oriental bike,please don't Fkup
a legend. Straight through exhaust 39723

Dai · 45 Re: Straight through exhaust Fri Aug 30, 2019 2:47 pm

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GF Wollongong wrote: or the Guzzi Mk 111

Oi!!!!!

timo27 · 46 Re: Straight through exhaust Fri Aug 30, 2019 3:35 pm

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moriarti wrote:Pardon me whilst i loosen my clerical collar,Would we contemplate fitting aftermarket Dunstall
reverse megas to the starship intergalactic spacecraft,(otherwise know as the K Series) No?
That is precisely the point one cannot improve perfection that is the K.Call me an old fart call
me old fashioned,but if you want a screaming machine buy an oriental bike,please don't Fkup
a legend.

Your an old fart

timo27 · 47 Re: Straight through exhaust Fri Aug 30, 2019 4:31 pm

timo27

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This i thought was the most useful and helpful section of the forum and in the past has helped me beyond belief, however it seams alot of members just want to TRY bullying people instead of helping, your a very weird bunch. I'm ok i can take the lot, but you should all think before you post your bull, a million cars and bikes have exhausts which sound good the same amount that sound bad ffs you all need to grow up, And yes ive had a f--- shit day

timo27 · 48 Re: Straight through exhaust Fri Aug 30, 2019 5:35 pm

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i would say most if not all commenting on this thread dont own any spanners
lol!

timo27 · 49 Re: Straight through exhaust Fri Aug 30, 2019 5:40 pm

timo27

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HaHa youve all popped out to see if the tool roll is still under your seat ffs

timo27 · 50 Re: Straight through exhaust Fri Aug 30, 2019 5:43 pm

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