looks about right for any head with lots of miles

a little valve grind and replace the valve stem seals ...clean up the intake rubbers and reseal them ...probably rings as well

+ a clean out of the carbon ....dont forget to do the intake and outlet ports ...there is a long held theory that about 400 grade polishing of the ports is the best option and get rid of casting flaws for better flow

the new head gasket should solve the rest .

Sounds about right to me Charlie... I am just debating whether to strip the top end down before putting it into the soda blaster.... or put it in whole....

I know i am going to have to take the valves out so i can clean them properly and reseat them!

Not to sure about the rings as looking up from the bottom into the back end of the cylinders it all looks good and nice and clean no sign of anything blowing...

I have got the new head gasket ready here so all is good in that respect

Pondering on the idea of taking both halves to an engineering workshop for them to dip them in a bath to chemically clean both halves....

Rick G wrote:Check that head for flat because the #3 combustion chamber had had a bit of water into it by the look of the valve heads and the piston crown.

The water that had got into Cylinder 3 was my fault when i set about the bike with the jet wash.... I hadn't secured the spark plug in properly hence it allowed water in.

Having been able to inspect things a bit closer I am not to worried about the state of it... It looks like cylinder 1 and 2 have a large build up of crap that would explain the staining i have on the outside of the spark plugs.

The head is now minus it's valves... all bagged up and ready for cleaning... If anyone else needs to remove their's i would reccomend this style tool.



It's far easier to use than the ones that have a compression handle.

All ready for a spot of soda blasting action tomorrow....

twincarb wrote:I have had a little niggle that there was something not quite right with my O/P shaft... I have now figured it out having had a look at Berts restoration page... My bike is an 88 model which means it should have 12 rivets but I can only count 6!

The 12 rivet shaft was first introduced on the 4V models (-89),
and then used on all other models shortly after this.

Inge K.

Oh right, I had though that they changed over in 85, my bad...

Today I have mainly been cleaning... I used the soda blaster to shift the majority of the crap, which took off most of the gasket, a few stubbon bits needed the assistance of a razor blade, and then back into the soda blaster to finish it off... Not as clean as getting it chemically cleaned mind... so that may still be an option.
I am thinking a chemical bath would be best for the bottom end as it would save me having to remove the pistons... Unless anyone thinks i am mad for doing it that way???







I have still got to remove the oil seals, has anyone got any tips?
I also still need to clean the valves, I tried one i/p and one exhaust valve in the soda blaster... The I/P cleaned up ok but the Exhaust is still well baked... best option to use oven cleaner on them?

oven cleaner sounds good ...but beware the cheap stuff ....it just doesnt work ...even in ovens

get those ports smoothed out ...some good casting marks in there i saw

I Use Oven Pride essentially you pour it into a bag and then place the part inside..... and then allow it to kick arse!

Think i will get 8 bags and split it between them and just allow it to do it's job.... all the time not mixing up the parts!

The Exhaust ports have definitly never recieved any port flowing hehe.... yet! I think being very carefull with the dremel would do the trick.....

twincarb wrote:I have still got to remove the oil seals, has anyone got any tips?

Here is a picture of a tool made for this use, you might get an idea of making your own..........a cheap needle nose plier and a mig welder.

Great work Twincarb love the photos you are really getting into this, the head looks fantastic how it cleaned up.

Halo

I wasn't sure if they would come out without a tool for the job, I will pop out tomorrow and get one i think. Be good to get the old seals out... Should have ordered new one's from motobins yesterday as i would have had them tomorrow and would have been able to get the bits all back in place (less likely to get mixed up then!)

Thanks Halo... I wasn't great at sorting photo's as i took the bike apart.... But am doing my best to record everything as it go's back together and as i work on each of the parts...

Tomorrow i will look at decoking the Piston Heads.... without having to strip the bottom end right down.... I am thinking about putting the whole thing into the Soda blaster as there is room, and then attacking it in there....

I am away on a course after the weekend and am going to be away for a week... so would like when i get back to be able to fit the new stem seals and get the engine put back together again.....

Yes TwinCarb I reckon you could just put the whole bottom end in the soda blaster cabinet and clean the pistons.

Halo

Little update for the day.... Have soda blasted the main block and it's not come up to bad... I have taken it to have one of the engine studs arc eroded as it snapped when i took it off! never mind these things happen.

I have also moved the frame into the garage so I can think about adding more to it and progressing the build along.







I am still trying to decide the order of fitting things back on but i am thinking Brakes, Handle Bars.... hmmmmm

Lovely deep lustre on the Blue...Keep it up my good man!

88KE

spending the day getting bits back onto the bike.... Thought i would show some pics of how it is taking shape..... I am definitley glad I choose the blue that i did! Can't wait to get the engine back so i can carry on with the Larger bits....

Oh the replacement Valve stem seals arrived today just a shame I am waiting for the insertion/extraction tool to arrive.... In the mean time the Valves are decoking in the kitchen!

Thats starting to look mighty nice Twincarb. I'm looking forward to the finished article

Ok, I haven't had a chance to do a lot since my last post, But took 10
mins out to drop into my local recovering shop... and had a chat with
them about recovering my seat.... I have now cleaned up the old one and
have dropped it off with them.... Am really looking forward to getting
it back as it is certainly going to compliment the bike!

Couple of before pics below....

Seat has just been returned from the upholsterer... and I have to say i am very happy with the end result!...

Good job. That's gonna look pretty!

Yeah I think/hope so... I cant wait to get to the stage where i am ready to get her back on the road

Looks fantastic twincarb love the seat color with the bikes colors

wow

I've been toying a change of seat cover/colour on mine Twincarb, now I have to do it - that looks fab. With the deep lustre paint you're on track for one stunning looking K

88KE

Only looks better with the side panel in place! I think it should be on everyone's list when there bike is due a service next hehe

Been a bit quiet here... I kept getting distracted and not ordering some parts i needed.... But I have done that now and waiting for them to arrive...

I have also finished off sorting out the top and bottom end of the engine as the pics show...

Few More...





Ahh I missed to mention that the water/oil pump is now rebuilt!


Last one just to have a look to see how its looking more than anything else!



Thought I would share the stitching on the seat cause I likes it :afro:

Just testing to see if my signature works...

That looks awesome. And it's good to see you didn't waste the excess paint. That old mountain bike in the background is looking good too.
As magilla gorilla says " It's good to have a spare"

Been a busy day today...





Now what to do tomorrow... fuel injection side... .cooling bits.... air box....

I am waiting for my gearbox to come back from being cleaned and then will decide if i will keep it plain or spruce it up with a coat of the black i have used elsewhere.... The black parts are suffering from dust at the moment hence not coming out great!

Quick update,

I got the gearbox back today, wasn't impressed with how clean it was mind... but the inside was fine and I think I will spray it later... Did a write up in the How to section on how to reassemble a gearbox!

looks like i have been really quiet on the updating side....

Well So far I have got the bike all cleaned and painted... and pretty much back together.... managed to burn out the starter motor.... oops all my own fault and I know i shouldn't have been pressing the start button for soooo long...

When i went back over to see whats occurring with the fueling side I discovered that one of my injectors wasn't working, so have bought 3 off of eBay, with any luck i should have a couple of working ones there for spares as well...

Below is how the bike is looking... I have prepped ready to spray the last few bits, just waiting for a dry day...

Lookin great twincarb. Inspiring work. I really love the blue.



88KE

Quick photo from the phone in the garage, I put the lower parts of the fairing on to see how it fitted.... and to make sure I had all the bolts needed to hold it in place!!!

...........nice colour, blend in well with your workbench.

I see the lower side panels are set up for crash bars....are you fitting a set? Black or chrome?

88

I am going to be putting the chrome one's back on.... I loathe chrome mind lol however i think that the look will be right with them chrome... although I reserve the right to wake up one morning and respray them Blue hehe

Wow twincarb, that's coming together really well! Love that seat.

Thanks Blakey,

I need to wheel her out of the garage again so I can finish spraying the parts, so weather depending will take some more shots going to be spraying the fuel cap as well so need to cover the hole temporarily... I have got a new fuel pump in the bike and want to keep it immersed in fuel this time lol!!!!

that blue is rather good mate ....love the seat as well

Well final day of spraying bits black today, in work over the weekend so not going to have a chance to fit them... Come monday morning all the bits will be fitted to the bike, including the new Goodridge brake hose's to the rear. so i will be able to have some sort of brakes on the bike now

List of things left to do....

Fit new front brake hose's when they arrive...
Fit new starter motor when it arrives....
sort out the injector that's not working... resistance reading is good, but its not allowing fuel to pass through... 3 replacements on there way as well just incase... and hopefully a few spare...
Get the engine to fire....
Get her back on the road in her new Colours.

Inge K. wrote: ...........nice colour, blend in well with your workbench.

workbench I am thinking of turning it into a sidecar as it won't need respraying to match hehe

It is all this innovative thinking on this forum, that got me amazed.

Ok I have been quiet for a while been tied up with work and a couple of problems... well following struggling to get the K running smooth, I did a compression test with Cylinder 4 at 0psi.... and 3 at 90 odd.... injected some oil and 3 went to 120, and 4 increased by a huge margin.
So strip of the engine was needed I took out all 4 pistons and replaced all of the piston rings. cyl 1,3 and 4 now showing 150psi and 2 is 140psi. I have got to say it was a pita getting the pistons back in with the rings particularly the middle ring which on most attempts of compressing them decided it wanted to rotate round and not stay with the pin.... I hope that the 10 psi missing on cyl 2 isn't caused by another ring problem.
I took the opportunity to also replace the timing chain. She is sounding so much quieter now which is good.

The only issue I am left with is pinking at higher revs and a high idle... which I am guessing is a timing issue...

The above 2 photo's were mid way cleaning the bike! I had used her a couple for a couple of trips to work which probably caused more problems with the piston rings!

She was also being a PITA to start, which isn't a surprise with the lack of compression so took the opportunity to replace the HT leads as well nice set from RAM engineering in the UK great fit and along with new spark plugs she started within a second of pressing the go button..

good work twincarb

whilst you had the head off, how did the valves look ?

Great persistance towards a good result, twincarb. I love that shot down the cobbled street.

88

The valves were all good and all sitting perfectly I took the time to check the clearances with the head on the bench and all were bang on identical which is good. (well the inlets were all 0.25 and the outlets were all 0.15.)

Am I right in thinking it's probably the timing thats just out at the moment for the pinking at higher revs and the high idle?

88KE wrote:Great persistance towards a good result, twincarb. I love that shot down the cobbled street.

88

I have now got that as my desktop screen! looking at it I wished it had stopped raining when I had finished washing the bike as the final image would have been far better!

Congrats, a really nice final result, Twincarb!

Great result twincarb looks really good a love the color. Great persistence as mentioned well done mate

Halo

Hi twincarb,

If you want to check the timing I have the BMW tools to do the job.

For a photo of the kit, have a look at post 1 in: http://k100rt.aforumfree.com/t3804-checking-the-timing-of-a-k100?highlight=ignition+timing

Although I hold the BMW tools for the BMW Club UK, I also have a lot of them myself. For the price of the postage you can borrow the timing tools.

Hope this helps

Mike