14-07-2022, 09:27 PM
I spent yesterday changing my rattly engine with a slightly dodgy clutch, for a much smoother one with a fierce "on or off" clutch.
The "new" engine has no go, struggles to get to 35 mph.
Fuel pump, carb, dynamo and dizzy, and exhaust and gearbox are all the same.
Pistons are new in slightly worn bores, the engine doesn't feel tight on the handle.
The heads are different, this one is standard low comp, the other was the last low comp, a little better c/r.
The only thing I can come up with is the cam gear is a tooth out, though I checked before re-assembly. Two small circles meshing with a dot - maybe the dot is wrong, maybe the gears are tight, though they are not noisy.
This engine was like this before I changed the pistons - I thought the sluggishness was due to special oil control rings adding too much friction.
Any ideas, please?
I'm probably spending tomorrow putting the old engine back in, I just KNOW the clutch will go half way up Prescott on Wednesday!
The "new" engine has no go, struggles to get to 35 mph.
Fuel pump, carb, dynamo and dizzy, and exhaust and gearbox are all the same.
Pistons are new in slightly worn bores, the engine doesn't feel tight on the handle.
The heads are different, this one is standard low comp, the other was the last low comp, a little better c/r.
The only thing I can come up with is the cam gear is a tooth out, though I checked before re-assembly. Two small circles meshing with a dot - maybe the dot is wrong, maybe the gears are tight, though they are not noisy.
This engine was like this before I changed the pistons - I thought the sluggishness was due to special oil control rings adding too much friction.
Any ideas, please?
I'm probably spending tomorrow putting the old engine back in, I just KNOW the clutch will go half way up Prescott on Wednesday!