Hi there folks, i am having trouble with my KZ900 A4, poor running, done almost everything imaginable to cure it, last but not least, the carbs were stripped, sonically cleaned, rebuilt, set, tuned, not much better, so my conclusion now is that there may have been a four into one on it at one time,...

chrisu wrote:std a4 jetting as follows :

main 115
pilot 17.5
needle 5DL31-3
cutaway 1.5
fuel level 3mm
float height 22mm


Check your choke seals as well

\much appreciated, thank you very much.

I think first you need to make sure valve settings and other basic settings are correct, then make sure what model carbs you have, then we can give you some base settings for it, are you running an original airbox? Sorry for the late reply, yeh standard airbox, 26mm Mikuni's, all valve clearances d...

What are your airscrews set to? Most references I've seen say 1 & 1/2 out from lightly seated but every a4 I've set up with colour tune burns the best colour at 3/4 out from lightly seated. Assuming stock jetting etc. 1 & 1/2 out means they are very lean at low revs. What plug colour do you...

Hi there folks, i am having trouble with my KZ900 A4, poor running, done almost everything imaginable to cure it, last but not least, the carbs were stripped, sonically cleaned, rebuilt, set, tuned, not much better, so my conclusion now is that there may have been a four into one on it at one time, ...

Hello guys/ladies, I'm a new member and need a wee bit of helpful advice, etc I have a KZ900 A4 (2 years) I love it, but it is not running 100%. The issue is it splutters at low speeds and not the kind of power I would have expected from a 900. Each pot compression checks ok, bucket shims adjusted, ...