Hey Everyone,
I've Been working on my CB750 for a few months now and have found a pretty decent amount of help on the forums.
Before the bike was barely running and wouldn't idle below 2000 rpm, Now its quite better but still a ways away from running well. I'm not a mechanic so don't be surprised if i've missed something even if its very simple
These are the current symptoms
- Bad/slow throttle response (very slow or bogs down if under 2000 RPM) Deosn't return to idle the fastest
- Small but consistent backfiring cylinder 1 (out of exhaust) - started after adjusting valve spacing (too tight?)
- not enough power to be able to roll around with just the clutch and not applying gas
- Plugs coming out sooty telling me it is running rich
- I have the stock 4 to 4 exhaust. pressure out of 1/4 is noticeably higher compared to 2/3. Can tell by holding hand near muffler
This is what I've done so far.
-Rebuilt Carbs (accel fuel pump was clogged)
- New Carb boots (old boots had vacuum leak)
- Installed dyna electronic ignition and coils
- static and dynamic timed ignition
- New spark plugs/boots and wires
- adjusted valve spacing to OEM specs
- Synced carbs
https://www.youtube.com/watch?v=dhGfIRxR9kE
Does anyone have any idea what I should be focusing on next? Did I maybe tighten the valves too much on cyl 1 to cause the backfiring?
I am also very curious about the cause of uneven exhaust pressure
I've Been working on my CB750 for a few months now and have found a pretty decent amount of help on the forums.
Before the bike was barely running and wouldn't idle below 2000 rpm, Now its quite better but still a ways away from running well. I'm not a mechanic so don't be surprised if i've missed something even if its very simple
These are the current symptoms
- Bad/slow throttle response (very slow or bogs down if under 2000 RPM) Deosn't return to idle the fastest
- Small but consistent backfiring cylinder 1 (out of exhaust) - started after adjusting valve spacing (too tight?)
- not enough power to be able to roll around with just the clutch and not applying gas
- Plugs coming out sooty telling me it is running rich
- I have the stock 4 to 4 exhaust. pressure out of 1/4 is noticeably higher compared to 2/3. Can tell by holding hand near muffler
This is what I've done so far.
-Rebuilt Carbs (accel fuel pump was clogged)
- New Carb boots (old boots had vacuum leak)
- Installed dyna electronic ignition and coils
- static and dynamic timed ignition
- New spark plugs/boots and wires
- adjusted valve spacing to OEM specs
- Synced carbs
https://www.youtube.com/watch?v=dhGfIRxR9kE
Does anyone have any idea what I should be focusing on next? Did I maybe tighten the valves too much on cyl 1 to cause the backfiring?
I am also very curious about the cause of uneven exhaust pressure
