Jetting help please

So they dont get muddled and lost in the directory, please post your tuning questions here.

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Hairbear
Posts: 14
Joined: Tue Mar 24, 2009 9:32 pm
Location: Essex

Jetting help please

Post by Hairbear »

Ex track bike, supposed to have reprofiled cams.
Std. airbor with extra holes drilled in it. Std. airfilter - K&N still in box.
Full Micron system.
Was running fine - 9 years ago! - when I stripped it, now back together and fitted with the Micron system. Prev. std. system and aftermarket can.
Carbs cleaned out and fine but now wont rev clean or out.
Just bought some 32mm carbs as the ones on it are 30mm, please advise jet / needle etc. so I can get in the ball park before it goes to the dyno.
Cheers
Gareth
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extonyg
zxr400 oc member
zxr400 oc member
Posts: 405
Joined: Tue May 12, 2009 9:40 pm
My Bike: zxr 400 L1 uk
Location: Portsmouth

Re: Jetting help please

Post by extonyg »

does it have standard needles?as this can also effect jet size.what are the mixture screws set at?
also where are the holes drilled in the airbox?why has it been drilled?is the snorkel fitted?
loads of factors effect jet size nearly every bike is different
why not just start at standard size and settings and go from there
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