XTC 600 twin compression question

Yama49601

Yama49601

New member
Joined
Jan 5, 2006
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896
Age
51
Location
Cadillac, Michigan
What should one of these read on a stock motor? I've read all the posts about them having low compression due to the stock thick headgasket but what should the numbers actually be? My friends is reading 90 on one and 95 on the other. Is that too low? Do you think it needs rings or is it normal for these to read this low? I know the gauge is good because it's brand new and it's a Craftsman. I used it to check the compression on mine and all my cylinders read about the same using this gauge (125).

What is the proper way to check the compression? Should the motor be cold? We checked it cold with the plugs out with the throttle wide open.

Thanks for the help.
 
Yama49601 said:
What should one of these read on a stock motor? I've read all the posts about them having low compression due to the stock thick headgasket but what should the numbers actually be? My friends is reading 90 on one and 95 on the other. Is that too low? Do you think it needs rings or is it normal for these to read this low? I know the gauge is good because it's brand new and it's a Craftsman. I used it to check the compression on mine and all my cylinders read about the same using this gauge (125).

What is the proper way to check the compression? Should the motor be cold? We checked it cold with the plugs out with the throttle wide open.

Thanks for the help.
Click to expand...

Yes that is very low,,a healthy 600 twin of that year should be
125 to 130psi with the stock HG.

he needs to tear into that and find out why it's so low.
 
The odometer reads 3300 but I don't believe that for a second by the condition of everything else. I guess it could be actual but if it is they didn't take the best care of it.
 
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