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Compression problem?

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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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.
 
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.
 
Yea. But its not running.

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.
 
You need to do a compression test and leakdown. Make sure the valves are right before statrting.
 
Maybe the clutch is still slipping, try turning the engine over at the crank shaft.

Steve
 
srivett said:
Maybe the clutch is still slipping, try turning the engine over at the crank shaft.

Steve
Click to expand...

Yes if the clutch is bad! the wheel will turn with little resistance
 
It was the clutch cabble.

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.
 
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