Kevlar1981
CB750 New member
Hi all new member here I've got a 1982 dohc 750f supersport that I'm having issues with all original apart from a motad 4-1 exhaust.
Bike was a non runner in several pieces when I got it.
I've been chasing numerous issues for ages , and have worked them all down to just the one now...
Engine stutters when pulling away or at low speed when just cracking the throttle, but pulls just fine right through the range when more throttle is applied.
List of what I've done so far.....
Carbs fully stripped and thoroughly cleaned many times with compressed air and carb cleaner etc
Carbs synced
Tried 2 to 3 turns on mixture screws in 1/8th turn increments
Had low compression on no4 found to be a burnt valve so valve replaced and all others lapped and re shimmed to spec,
Ignition timing is spot on with strobe,
New plugs ngk dr8ea,
Stock airbox and filter,
No signs of any air leaks on isolators.
I'm just about out of ideas
Any suggestions would be greatly appreciated.
Bike was a non runner in several pieces when I got it.
I've been chasing numerous issues for ages , and have worked them all down to just the one now...
Engine stutters when pulling away or at low speed when just cracking the throttle, but pulls just fine right through the range when more throttle is applied.
List of what I've done so far.....
Carbs fully stripped and thoroughly cleaned many times with compressed air and carb cleaner etc
Carbs synced
Tried 2 to 3 turns on mixture screws in 1/8th turn increments
Had low compression on no4 found to be a burnt valve so valve replaced and all others lapped and re shimmed to spec,
Ignition timing is spot on with strobe,
New plugs ngk dr8ea,
Stock airbox and filter,
No signs of any air leaks on isolators.
I'm just about out of ideas
Any suggestions would be greatly appreciated.