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Old 07-04-2008, 10:22 AM   #1
wfd853
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NO compression

I have a Coolster China bike (yes I know there is my first problem) I have had issues since I bought it and its only about a month old. I fixed the issue of slack in the clutch and the clutch sticking but now I have no compression when I go to kick it... Any Ideas???? I checked for bent valves already and I'm kinda out of ideas. Thanks
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Old 07-04-2008, 10:50 AM   #2
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your timing might be off or a bad gasket
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Old 07-04-2008, 11:10 AM   #3
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RINGS, FTW !

WHAT KIND OF BIKE IS IT!

COULD BE VALVE SEATS, ALOT OF THINGS CAN CAUSE NO COMPRETION, DOSE IT HAVE A COMPRETON RELEASE?

CHECK THAT AS WELL IT MAY BE BAD!
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Old 07-04-2008, 01:12 PM   #4
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Thanks to both of you. The bike is a Coolster, I picked it up off of Harwin in SW Houston. I'm stuck at work today with limited resources but I am going to try it all. I took a look at the Valve seat and it looks good. Thanks agian
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Old 07-04-2008, 01:15 PM   #5
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It doesn't have a compression release and I hope not bad or blown gaskets b/c its only a week old.
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Old 07-04-2008, 01:59 PM   #6
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Quote:
Originally Posted by wfd853 View Post
Thanks to both of you. The bike is a Coolster, I picked it up off of Harwin in SW Houston. I'm stuck at work today with limited resources but I am going to try it all. I took a look at the Valve seat and it looks good. Thanks agian
coolster what? f4?
http://www.coolster.com/moped2.html

??
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Old 07-04-2008, 03:17 PM   #7
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if you suspect the rings, put a little bit of oil in the cylinder through the spark plug hole. It will take a couple cranks but you should start hearing the compression and feeling it fight you.

Another way to check is to screw a compression gauge into the cylinder and crank w no dial on it; you will hear the whistle as it builds up compression.

As mentioned before; if your timing is off the valve wont close at the right time and compression will be lost through the open valve. sounds stupid but remember warpage or valves being put in the wrong side. i've seen it
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Old 07-05-2008, 04:40 PM   #8
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maybe when u messed witht he clutch it acks like its engaged and the bike wont start with it engaged. only in neutral with it disengaged. try it
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