Hey guys! Great site, been reading a lot here!
Last fall i bought a CB900f SS form a friend that gave up on it so i figured id give it a whirl. She only has 15k on it and it is in great shape! The problem is she doesn't have any power over 6k rpm and good luck getting her there! She will fall on her face. Revs right up in N tho, gives a loud backfire sometimes tho just in N. If you crack the throttle over 1/4 (sometimes you can ease it slowly to 1/2) she will bog bog catch bog bog catch. It is a miss across all 4 Cylinders. Keep the throttle under 1/4 and u can ride her right up to 60mph through the gears.
Pulled every jet in carbs and ultrasonic cleaned for 8 hrs @ 150 Deg. Full rebuild kits. Stock Jets (Got to try the new ultrasonic cleaner out yay! They look brand new & shiny! great investment)
Synced with Gauges running at 2k rpm i don think i could get em closer.
Cleaned Pepcock new fuel line with inline filter.
New Plugs
Timing Chain Adjusted to spec
Good Compression across the board , within 5 psi of each other
Stock Air Box and filter, new rubbers between carbs and head and airbox.
I was thinking it was starving for fuel but i see good flow through my filter. Any ideas? Im kinda thinking IGN? I dont know it to well on these bikes. If so i have a CB750 DOHC parts bike, any parts interchangeable?
-Blod
Last fall i bought a CB900f SS form a friend that gave up on it so i figured id give it a whirl. She only has 15k on it and it is in great shape! The problem is she doesn't have any power over 6k rpm and good luck getting her there! She will fall on her face. Revs right up in N tho, gives a loud backfire sometimes tho just in N. If you crack the throttle over 1/4 (sometimes you can ease it slowly to 1/2) she will bog bog catch bog bog catch. It is a miss across all 4 Cylinders. Keep the throttle under 1/4 and u can ride her right up to 60mph through the gears.
Pulled every jet in carbs and ultrasonic cleaned for 8 hrs @ 150 Deg. Full rebuild kits. Stock Jets (Got to try the new ultrasonic cleaner out yay! They look brand new & shiny! great investment)
Synced with Gauges running at 2k rpm i don think i could get em closer.
Cleaned Pepcock new fuel line with inline filter.
New Plugs
Timing Chain Adjusted to spec
Good Compression across the board , within 5 psi of each other
Stock Air Box and filter, new rubbers between carbs and head and airbox.
I was thinking it was starving for fuel but i see good flow through my filter. Any ideas? Im kinda thinking IGN? I dont know it to well on these bikes. If so i have a CB750 DOHC parts bike, any parts interchangeable?
-Blod