Sophomore Rider
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Post by mopojo on Jun 24, 2014 22:15:33 GMT -5
Upgraded a friends ped to 80cc and dude put 3,000 miles since. Calls me up saying the ped is making a helluva rattling noise and smoking. Told him to bring it by as it sounded like rings were shot and possible engine slap. Wasn't prepared for what I found when opening her up....
What would cause this damage? I made sure to align rings properly and that the clips holding the wrist pin in were seated correctly. Both clips were still snuggly in the grooves yet as one can tell, the offsets were broken off.
Any insight as to what may have caused all this?
Thanks,
Mopojo  
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Post by rockynv on Jun 24, 2014 23:23:26 GMT -5
Could have just been a defective circlip or could be from running hot due to a lean condition and/or pinging too.
Did you rejet so it wasn't running too lean after you upgraded to a larger cylinder?
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Post by jjoshua20213 on Jun 24, 2014 23:39:06 GMT -5
Looks like overheating was a factor. I worked on a dude's bike and found the same dents in the cylinder only it was top and bottom not sides.
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Post by alleyoop on Jun 24, 2014 23:46:22 GMT -5
Looks like the Circlip came out to me.
Alleyoop
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Post by wilds on Jun 25, 2014 0:18:16 GMT -5
Looks like the Circlip came out to me. Alleyoop I would agree with that opinion ... |
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Post by tvnacman on Jun 25, 2014 4:52:02 GMT -5
Looks like the Circlip came out to me. Alleyoop I would agree with that opinion ... third on this , but but make them pig rich anyway . John |
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Sophomore Rider
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Joined: Jul 6, 2013 21:27:28 GMT -5
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Post by mopojo on Jun 25, 2014 8:48:51 GMT -5
Circlips were still seated when disassembled; although the off-sets (where one will grip them to install) were missing (shown in image 2). Wrist-pin was in place and one circlip had to be forcefully removed before wrist-pin could be extracted: Will they re-seat themselves?
Put an adjustable carb on when BBK was installed and tuned to rich: Sparkplug was showing a med-dark color when checked after 50 miles. Did NOT up-jet.
Also notice that the base-gasket (cylinder) had been pushed outward; as if oil pressure was excessive *or something*....
Thanks for all the input, guys.
He is ordering another top-end, exhaust gasket and high performance exhaust today.
What jet size do you guys think is necessary?
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Post by tvnacman on Jun 25, 2014 9:30:15 GMT -5
A guess is in the 80's .
John
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Sophomore Rider
Currently Offline
Posts: 137
Likes: 24
Joined: Jul 6, 2013 21:27:28 GMT -5
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Post by mopojo on Jun 25, 2014 14:05:36 GMT -5
OK. Cool. Thanks again.
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Post by alleyoop on Jun 25, 2014 14:14:25 GMT -5
Yea try a #  or #  on the main jet. Alleyoop |
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..BAD TO THE BONE..
or #
on the main jet.