1988 fz 600 air filter cone issues

[billy_27]

ive just removed the original air box of my 88 fz 600 there a bloody nightmare to take on/off. just put some cones on and obviously it dont run right above 6000 revs below that its smooth. do i need a air adjuster kit if so were from or do i need something else. this bike ive chopped and changed for a bit of fun and aint bothered if i can ever get it spot on but no bloody way is that air box going back on il attempt to post a picture of it. i call it the turd

[Vincent]

Two ways I would go about re-jetting a bike after removing the airbox and fitting aftermarket "cone" filters:-
1/ Find someone who has done this already to the same bike, (by sweating, swearing, scraping knuckles for days on end etc), and ask nicely if he'll share what size jets he used etc.
2/ Buy a set of new jets for each carb with about 6 or 8 different main jet sizes and 4 pilot jets, + new needles if the original ones can't be moved, a good set of float bowl gaskets, (because after you've removed them about 30 times, they're going to be a bit rough), some spare float bowl screws, (because you always drop one or two), and then hire a Dyno with mechanic for an hour or two.

The third way involves guesswork - going 1 or two up on the mains, maybe lift the needles one groove, (if possible), and putting up with the bike if/when it runs like shite.
Bike airbox's are notoriously fiddly to get back together but most manufacturers spend a fair bit of time designing them to work well with the bike's engine and carbs. Sometimes they prioritise fuel economy and so "altering" the air flow in some way may release a few horsepower but it's very rarely easy to get things right from the off.
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Space Is Deep

[andym]

I fitted pods to my gpz and it ran like shit no matter what I done.... I ended up just taking the 2 days to refit the airbox eventually

[billy_27]

[billy_27]

[temeluchus]

it can be done. But you will need to find the right combination of main jet and needle position.

The correct mainjet will most proably be between 10-40% richer than stock and the only way to find out is to try it out.

once you have found a mainjet that works, you will then need to fiddle with the needles to get the midrange to behave.

likely you will never get it to pick up as well off idle, but it shouldnt be too bad.
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Some shite cruiser. Now with guns and FREEDOM!

[temeluchus]