www.zxrworld.co.uk

Just a question for the tuning gurus out there!!

If my bike is currently set up perfectly and I am now fitting a ram air system, will I need to alter jetting?

I am presuming not as the Ram air does not really affect things until the speed is up, but not sure

jetting will be WAY different with a ram air box .. and it depends who's system you are fitting as to where the jetting will end up.. and wether there's a filter etc etc ..

as a rough guide,

block the air jets, R1 needles and work down from 120 ish on the mains ..

really though go and get it setup on a dyno with a big fan by somemone who's done ramaired zxr400's before.

like http://dynopro-racing.co.uk/ or http://www.hobbsportracing.co.uk/

oh, and the sp shock you're flogging on ebay.. isnt an sp shock.