YT175 Compression??

[thew47]

I just picked up a YT175, and have plans to restore it. In the midst of doing the normal check of basics things, I go to check the compression. Well......... It is 40 PSI (unfortunately!!). So, what is the compression supposed to be? I am sure it is not 40. Anybody know? Thanks! Also, anybody got a manual scanned or downloaded for a YT175?

[4 wheels?]

Somewhere above 150 would be a good starting point. I couldn't find any manuals on some of the manual sites.

[old-yellow]

The haynes manual says it should be 128psi, also when you checked compression did you hold the throttle wide open because thats how you check compression correctly.

[thew47]

Thanks 4 wheels and old-yellow for the info!!! And thanks for the hook up about mike old-yellow. I will try it again with throttle all the way open. 40psi is terrible!!!! I will try it this evening and see what it looks to be. Looking like I got some breakdown work to do. Hope not though! Thanks guys! As always, all info is well appreciated!!!!

[old-yellow]

If you do have to bore it and put in a new piston I would get a wiseco piston instead of a stock one.

Here is the place I got mine from it was the cheapest place I found.
http://www.mfgsupply.com/m/c/process.html