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Hi all

I bought a L model track bike a few months back, well actually it must have been raced as it was lockwired up, anyway, first blast up the road with it and it ran fine and smooth in the first 4 gears then lost powerin 5th, thought, ah, carbs need cleaning (bike had been standing for a few months) as this happened exactly the same with my zxr750. Took the airbox off to find no snorkel and air filter but just some mesh, also the airbox itself was a knackered.

Cleaned the carbs, put them back on an in the meantime got a new airbox with k and n filter, took it up the road and it ran like a bag of shite and sounded like a tractor, took the snorkel off and it ran slightly better but only slightly, took the filter out and it ran much better but still sounds a bit like a tractor to me

I have not balanced the carbs yet but will do that next

The bike is running a full system (dnnt know what make) with an art can, I thnk it has dynojet needles (the ones with 2 circlips at the top) an is running with #96 main jets

Although now running much better after cleaning the carbs and without the snorkel and fiter, it sounds "gruff" for want of a better word compared to befroe claning the carbs

What do you think guys

Cheers

Rob

sounds like your bike is set up to run without snorkel and filter . needs the carbs put back to standard to run standard box and filter,thats if the engine is standard. trip to the dyno my friend......me thinks

with having an 'open' airbox with no snorkel or filter you will get alot of induction noise which can make the bike sound as if its not running properly, it definatly sounds like its been tracked so if you want to have the filter back in its gona have to be set back up on the dyno for best results.
are you planning to keep it as a track bike?

extonyg wrote:are you planning to keep it as a track bike?

Yep thats the plan, just bought it for a bit of fun on the smaller circuits

Rob

Just me or 96 jets seem a bit wee?

As Rob (mcmullen123) said a run on the dyno'll tell you exactly what you need to know but sounds lean to me. i'd recon going up to a 105 kehin would get you in the right ball park if you've got blocked air correctors.

Deswilkie wrote:Just me or 96 jets seem a bit wee?

As Rob (mcmullen123) said a run on the dyno'll tell you exactly what you need to know but sounds lean to me. i'd recon going up to a 105 kehin would get you in the right ball park if you've got blocked air correctors.

I thoght that with #96 jets after reading a few things

BTW, what are air correctors, do you mean mixture adjustment screws and how do you "block" them

Cheers

Rob

Attached a photo highlighting where the air correctors are, some folk block them with a dab of araldite (do not start the bike the same day or put in too much). Main jet would be about a 105 Kehin for this. To run without these blocked you're looking at about 132.5 Kehin. These are approx jet sizes but would get you in the right area. Then Dyno time

Heard various pros and cons to this but I've not seem much difference. If you're going to run it as a track bike I'd just leave them unblocked and see what like it runs with 130-132.5 kehin main jets. You can always block them off at a later stage if you wanted to but not the other way round.

Let us know how you get on.

Right, after mucho fecking about I have a bike that is running as it should be

Balanced the carbs, they were way out and its now running pretty smooth, took it up the road for a quick blast today, feels so right now, booked it into my mates for a dyno run next week

Now I can concentrate on the sussy and the brakes

Rob