Compression problem?

[Anonymous]

My GS has good compression. While in 1st gear I can't turn the back wheel by hand. The CB750 I just got turns by hand in any gear. It has a little more resistance while in gear, but it turns pretty easy.

Atleast I know the engine isn't locked up. Any how. Is this a bad compression symptom? This is going to be a compleet restoration so I do plan on atleast going through the top end before I try to run it. I was just wondering why the rear wheel would turn so easily.

[Anonymous]

The best way to check compression is with a compression gauge that goes into the sparkplug hole. I am told a leak down test will verify whether or not the valves are seating properly but you would have to ask a mechanic for the details.

[Anonymous]

Yea. But its not running.

It is not running now. I was told that it was running 8 yrs ago when the clutch went out. I suppose I could get started on making it run, but I don't really want to make it run till after re-work the top end. I don't even intend on putting the motor back in till the frame is restored.

[cbxchris]

You need to do a compression test and leakdown. Make sure the valves are right before statrting.

[Anonymous]

Maybe the clutch is still slipping, try turning the engine over at the crank shaft.

Steve

[SqDancerLynn1]

Maybe the clutch is still slipping, try turning the engine over at the crank shaft.

Steve

Yes if the clutch is bad! the wheel will turn with little resistance

[Anonymous]

It was the clutch cabble.

I figured it out. The clutch cabble was adjusted all the way out. + it was rusted all the way in the engaged position.

I took the cable off, and the clutch disengaged. Now it's fine.

I will be inspecting + replacing the clutch as part of the resto, but atleast now I feel better about the bottom and top end condition.

Thanks again. Chris.