FZRSupport: the FZROnline Archive

Hi

Will the YZF600 thundercat carbs fit and work on the FZR600 engine. Its for racing only so not really worried about losing a little low down ifs the top increases allot

Are there any other options? Preferably carbs that are easy to get hold of.

Can the YZF cams be fitted into the FZR as well??

I know about the 660 with the YZF top end but cannot race with a different cylinderhead or 660cc

Thanks

If you were to purchase cams from a shop, the YZF600 and FZR600 use the same performance grind profile. Which leads me to believe that the YZF600 and FZR600 cams are the same from the factory, so you will not get any benefit.

I've heard of people using an exhaust cam on the intake side for a performance gain though.

The YZF600 carbs will not fit onto the FZR600 head directly. The carb boots on the FZR600 are too small, and the YZF600 carb boots are a different shape at the head mount. You would need to make an adapter to mount the carbs. Not worth the effort really.

Thanks for the info

i'l have a look and a measure of the EX cam, I have a couple of spaire engines (in boxs) so this would be ideal.

Carbs seem a bit trickier, I'l keep it in mind though.

Thanks

arent cali cams supposed to be better too?

i think i remember reading about some one trying yzf carbs on a fzr and they said it was a fail. maybe yzf carbs are not designed for the higher velocity of smaller intakes? does that make sense to any one else? maybe they did a half-a$$ mod to get it to work... it was a long time ago that i read about it.

reground cams shouldnt run you too much at a local shop... maybe they may give you a discount on shaving the head some too?

speaking of which, does anyone know how far you can shave a fzr/yzf head? not tryin to thread crap

Are the yzf carbs bigger? If they are you will loose some power down low, but the top end will get better,(i made that mistake with a fzr400 superbike back in the day). Before you get yzf cams, you should look up the profile and compare to the fzr profile. As far as using a exhaust for intake cam, only do that if it is a kit grind and I would only do that if you are confident you can set it up, its not easy!!!!!

fzr600 and yzf600 have the same lift and I'm pretty sure the same duration. What you do is put an inlet cam on the exhaust side as it has more lift and duration, not the other way around. The inlet has 0.2mm(0.008") more lift than the exhaust and about another 10 degrees of duration. This will require a dial indicator, a timing wheel and adjustable cam gears to get done properly.

I have 98 yzf's on mine.Had to shoe horn them on because there 2mm biger,but they work fine.