I am in need of jetting information for 39mm keihin FCR flatslide carburetors if any one can help it would be greatly appreciated. I have a 95' CBR900RR with a MVR 4 into 1 full exhaust and a stock motor. I asked SUDCO and they will not sell me or give me any jetting info. These carbs originally came off of a Yamaha and the jetting was way off for the 900rr. Changes have been made to them so far but still can't get them right, when you roll on the throttle it picks up good and goes, but when you hammer the throttle the bike boggs and hesitates before smoothing out and accelerating hard. Thanks

 

My setup is pretty similiar to yours. I run a #120 jet but it could use a little more. Also having them synchronized would help alot

 

I am building a pulling tractor with a 95 900rr engine. I was wondering what air filters and what are you getting these carbs off of?

 

I have a quick question about boring a 41mm FCR. Do you bore the 41mm carbs? and how large can you bore it to? I am looking at maybe boring it out when I bore my bike to a 500cc later this summer.Thanks, Rob Deimn guys! Black eyed peas - Boom boom pow has blowed my brain ))) try it and write me PM your mind)

 

with those carbs u can never just crack the throttle it will always bog

 

i have a 600f3 with the fcr carbs and i have the same problem. if i roll on the throttle it runs great but if i crack the throttle open it bogs.