How do you confirm that the idle speed that the tacho is telling us is correct... I know there is an adjustment that can be made inside if it isn't right. But what method is used to confirm in the first place it is correct....
I guess this may really be electrical mind hehe

I would recommend pulling the number 1 sparkplug wire, putting a screwdriver into it and hold onto the screwdriver shaft. While the engine is running, count the number of electrical pulses for 60 seconds, and then divide by 2 (remember: wasted spark system). That should give you an accurate RPM to work from...

and my eyes are watering too

Now for a serious reply TC I dont have any way of checking but once upon a time in another life I has a ignition timing light that would read the rpm according to the plug pulses that clubie wants you to hang onto. There probably are the same items available today but I dont use them anymore as I dont have a need, mine broke and it went into dumpster.

club_c wrote:I would recommend pulling the number 1 sparkplug wire, putting a screwdriver into it and hold onto the screwdriver shaft. While the engine is running, count the number of electrical pulses for 60 seconds, and then divide by 2 (remember: wasted spark system). That should give you an accurate RPM to work from...

OUCH!!! won't you lose count easily as youre getting electricuted?....hey my hair has grown back!!:afro:

some "auto" digital meters have a count cycle on them ....for tacho functions ...a good way to do it would be to tap into the injector pulses and divide by something . maybe 2 ?

I use one of these:
http://www.ebay.co.uk/itm/180697823584?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Hover K100 wrote:I use one of these:
[url=http://www.ebay.co.uk/itm/180697823584?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

http://www.ebay.co.uk/itm/180697823584?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649[/quote[/url]]

yep a nice cheep solution hover ....you would only need it for a short time to calibrate the guage ...as i dont think they stop working that often ..

could this be an ideal solution to pass around all the friends on the forum ....?

of corse a small contribution to the purchaser ...and "mail on freight cost" would certainly help ....

hey this thing could feasably circumnavigate the world several times huh ?

the replies have had me laughing away this morning! Logically using the HT lead I have calculated I need to stand in a pool of water without shoes on in order to get an accurate reading

I am thinking the safer option would be to measure from the low side of the Coils as that would be getting the signal to fire the HT side.

I think i have identified a tool that will do the job, designed for classic cars.... and with it being a wasted spark system the maths should speak for themselves... the tacho will read in the region of 1000-2000 but the readout would either be half or double what it should be so should be obvious....

The only reason I am looking to do it is because I had to do a repair to the tacho in which one of the legs had broken off I replaced it with a piece of wire which i suspect would have lower resistance but not sure how much difference and if it would be sufficient to cause a noticeable difference...

A wasted spark system fires on every up stroke just like a 2stroke would so its gonna read equal to rpm. I reccon the count method is for speed freaks as i cant hardly keep up with the cpr count - remember 1 thousand and 1 etc

A easier way to count when using the first metod.

1. Put the laptop at the seat.
2. Turn on the camera, in the direction to your face.
3. Start the bike, and grab the HT wire.
4. Run the bike untill you feel your nose starts to vibrate.
5. Watch the clip afterwards, count the number of times your eyes turn wide open during one minute.

ooh ooh slow mo on a video, now that would be something

I have no wheels on the bike at the moment! Just about to take them to get some new rubber on them, so can't move the bike at the moment but when I get back I will move the bike and get a video... I suspect that I may have trouble in counting back the number of time's my eyes go wide so will post it here for the normal site assistance!

Normal site assistance Normal??

wheels ........?

who needs wheels ?

cummon twincarb ...get the jack ...or block of wood under the sump going ....your just making excuses now !

Close to the redline:
......Marty`s left eye indicates a slight misfiring.

bwahahahahah ...classic inge .....thanks for the belly laugh !

Seriously friggin' hilarious Inge!

Thanks Inge haven't laughed so much for ages

Ok I got a multimeter which is capable of measuring the rpm by taking an inductive measurement from the HT leads. It is reading 1988 so not sure if it's reading the year the bike was made or if I need to half the reading! Which would put it very close to 1000 rpm. So I am happy for today.... going to try and balance the throttle bodies tomorrow and in a couple of days will get around to checking the idle mixture with a CO tester...

good work twincarb ..im impressed !

now throttle bodies and mixture settings are a whole new experience ... good luck !

From what I understand it's identical to setting up 4 carbs on any other bike..... Get the bike nice and warm. Connect the test equipment up to the bike, make adjustments to make sure that all 4 are even..........

Seem to recall some sort of warning that they are a nightmare mind................................

yep ...it is quite simple ...well if they were 20 years younger ..

its just the rubber issues we find (out here especially) giving vacuume leaks and stuff ..maybe its all the sun we get ?

I guess it is a mix of the bikes own heat on top of it and age. I am hoping that things will work out smooth for me... Just been out and grabbed a couple of T pieces so I can keep the vacuum connector jobby connected....

I guess I will know if I am on a loosing streak if I really struggle to get my gauges to settle down.... This time tomorrow I should know if I am in business lol

Of course I would go for the mechanical approach, stuff this on the crankshaft by the ignition sensor.



Can I ask why you need to know an accurate RPM reading?

Paul.

PS my outfit idles smoothly at around 600 RPM. (on the tacho, that is)

Hi Paul,

The only reason I was more curious than anything else is because of the repair I did to the tacho which involved replacing one of the legs which connects to the dial and carry on onto the circuit board. This meant that I had no idea what the reading had changed by.... It's also one of the tune up jobbies before adjusting the throttle bodies the idle should be set. As I wasn't sure if I was between 900 and 1000rpm. I now know that I am set to 1000rpm or just under.

I now know that I am approx 200rpm over on the tacho at idle... At some point I may adjust it to show a truer reading!

meter This is the meter I got which isn't to expensive and will be of use on the spitfire when I get the engine running...

You can borrow my meter and see what it reports your outfit as hehe I have to agree that a mechanical device connected to the crankshaft is the ideal way of measuring it and to use a piece of electronics would need a couple of hundred £ spending to ensure the accuracy of it.

This is one of the funniest post that we ever had.

Please don't start to push members of this forum to suicide.

CF

Are you suggesting that I shouldn't post a video of some of the possible suggestions and that I should't post it into the How to Section.....

Think I am going to have a quick read of the rules to check that it wouldn't be breaking them.... or is the rush now on to amend the rules before I can get a video posted!

twincarb wrote:CF

Are you suggesting that I shouldn't post a video of some of the possible suggestions and that I should't post it into the How to Section.....

Think I am going to have a quick read of the rules to check that it wouldn't be breaking them.... or is the rush now on to amend the rules before I can get a video posted!

I believe Club_C should demonstrate his idea into the 'how to section'.

It would be impressive to see a video of Club_C tied to the ignition coils of the bike and going uphill on the ski slopes of BC.

Crazy Frog wrote:

I believe Club_C should demonstrate his idea into the 'how to section'.

It would be impressive to see a video of Club_C tied to the ignition coils of the bike and going uphill on the ski slopes of BC.

So it has come to this, has it??

Well at least it'll put a spark in your life for those loooooong winter nights that are coming.

As I mentioned earlier I did the throttle body balancing this afternoon.... not to hard my old trusty gauges did the trick.... the only problem I had was I decided to use the exhaust extraction in the hanger... Silly me forgot it's designed for trucks really.... With it connected to the back of the exhaust and on switched on it sucked too much and I couldn't do the job....

Now you should not post pics like this! what if the epa saw it and started thinking we all need a shed like that to ride along in all connected up to and all. tsk tsk because I cant find waging finger in the emoticon thingy, nice blue bike that pug blue