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 Low Compression (50PSI) on 2005 Zuma 70cc - new rings? 
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Scooterologist

Joined: Sun Oct 11, 2015 8:51 pm
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Post Low Compression (50PSI) on 2005 Zuma 70cc - new rings?
Ive been blowing out a lot of white smoke recently and not running the best. My cheap compression tester tells me I only have 50PSI compression, and although it is cheap, it has proven pretty spot on side by side with a Snap on. If I understand correctly I just need new rings?


Tue Jul 10, 2018 8:08 pm
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Post Re: Low Compression (50PSI) on 2005 Zuma 70cc - new rings?
More often then not you will need a new pistion to go with the rings as they are a soft al. Put a little motor oil down the bore and then retest the compression and see if it goes up. If it does that’s positive for needing at least rings if not pistion too.

But you have to look at the costs some times it’s almost as much for rings and pistion cir clips wrist pin and bearing

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Thu Jul 12, 2018 7:37 pm
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Scooterologist

Joined: Sun Oct 11, 2015 8:51 pm
Posts: 33
Post Re: Low Compression (50PSI) on 2005 Zuma 70cc - new rings?
Got it thank you. I had to take it apart to even figure out what is in it. Piston head is all black and covered in carbon build up, or whatever it is. Looks like at least part (header) of it is Stage 6 and currently ASSUMING it is all Stage 6, and if I believe what the guy told me who sold it, and the norm, it's 70 cc. Trying to match a serial/part number up now. Looks like Rocket 4 crankshaft which I guess is stock?


Thu Jul 12, 2018 8:14 pm
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Scooterologist

Joined: Sun Oct 11, 2015 8:51 pm
Posts: 33
Post Re: Low Compression (50PSI) on 2005 Zuma 70cc - new rings?
Yeah, looks exactly like this one: viewtopic.php?f=3&t=13024

So guessing it is a Stage6 Racing 70cc AC Cylinder Kit. Not exactly great news as appears to be limited sellers. :-/


Thu Jul 12, 2018 8:24 pm
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