| Author | Message |
VinyLover
99 posts |
#50658 2008-05-19 13:14 GMT |
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I did the top end and after 5 hours of riding I lost compression. When I took it apart I found something had scraped the side of cylinder and then ended up being pounded between the cylinder head and piston. I checked the wrist pin bearing and the piston c clips and are all fine. The ring is also in one piece. Thanks for any help on this.
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Cheesybite
107 posts |
#50659 2008-05-19 13:22 GMT |
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Sounds like time to re-sleeve the cylinder, which is cheaper than replacing. You can check around the web and with your local bike shop to find someone that can do it. It is a fairly common service and should have you back up and running with renewed performance and a few more years out of the engine so long as whatever caused the problem has been fixed.
Best luck! |
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CaliforniaDream
111 posts |
#50660 2008-05-19 13:46 GMT |
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You'll have to replace the piston and cylinder head if damage has occurred. If something was pounded between them, the damaged spots will cause pre-ignition because they will be "hot spots" that ignite the fuel/air mix before timed ignition. If you can weld, fill the damaged spots on the head and grind them down smooth with a hand grinder or Dremel tool. It's a casting, so it won't like being welded.
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DeadlyAmphibian
124 posts |
#50661 2008-05-19 15:43 GMT |
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If the piston was loose in the bore, the piston skirt could have chipped a piece off.
Check the big end bearing (lower connecting rod). If your engine has a power valve, make sure nothing broke. Check the reed valves. Check your air cleaner to see if anything is missing. I worked on a Blaster - the fastener holding the air cleaner went through the carb and got wedged in the reeds. |
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