Jetting help bike bogging down
#1
Jetting help bike bogging down
I just bought a 97 cbr600 f3. The ******* I bought it from cut the entire top half of the airbox off and put a drop in k&n. The thing bogs down like crazy when you gun the throttle. I have to ease on the throttle slowly or it studders like its choking. I cant rip it.
I took the carbs off to see what its got in there for jets. I opened up one of the end bowls and the main jet is a 140. What is stock size? do you think 140 is too big or too small? I am no good at jetting it took me a month to get my quad jetted right. What do i need to throw in there? is the 140 too big or too small? My buddy runs 130s in his katana with pipe and filter.
I also have a D&D pipe on there.
What size jets?
I took the carbs off to see what its got in there for jets. I opened up one of the end bowls and the main jet is a 140. What is stock size? do you think 140 is too big or too small? I am no good at jetting it took me a month to get my quad jetted right. What do i need to throw in there? is the 140 too big or too small? My buddy runs 130s in his katana with pipe and filter.
I also have a D&D pipe on there.
What size jets?
#3
98 & 97 will be interchangeable tmk. The differences come into play 95 / 96 vs 97 / 98.
Stock jet sizes on the 97 / 98 are 138 on 1 & 4, 140 on 2 & 3. Sounds like the PO made some 'adjustments' for his 'mods' (aka improvised for his improvisations) if you found 140s on an outer carb. Also means the inner carbs are likely larger. Might have to take her back to stock just to get a known baseline.
Try getting a stock airbox on her and verify all your air hose routings. Clean the carbs if necessary and see how she runs with the current jetting. An aftermarket exhaust + k&n filter might need larger jets since they increase air flow. But half an airbox will definitely be screwing with performance.
Stock jet sizes on the 97 / 98 are 138 on 1 & 4, 140 on 2 & 3. Sounds like the PO made some 'adjustments' for his 'mods' (aka improvised for his improvisations) if you found 140s on an outer carb. Also means the inner carbs are likely larger. Might have to take her back to stock just to get a known baseline.
Try getting a stock airbox on her and verify all your air hose routings. Clean the carbs if necessary and see how she runs with the current jetting. An aftermarket exhaust + k&n filter might need larger jets since they increase air flow. But half an airbox will definitely be screwing with performance.
#5
So go with Honda933's #s
#6
#7
I would start with stock jets, when i bought my bike in Vegas it ran great with 140 on 1&4 and 142.5 on 2&3. got it back to Colorado and it blew flames like it was its damn job. cleaned the carbs, put in 140/138 and re-tuned/ sync'd them, ran better but recently dropped down to 138 and 135's finally and its perfect now. I have a Cali model with a K&N, ignition advancer, and Vance and Hines SSR2 exhaust. Good luck
#9
#10