06-04-2008, 11:04 PM #1
Think i found what caused my piston burn down.
Last fall befor i left for school i had issues with the 750. I had 125, mag, 125, cen, 90 pto. I had taken the carbs apart to take a quick look at the time an they looked crappy. Now after doing a full analysis this is what i concluded. The diagphram was very streched out compared to the new one, not sure if this has an effect on carb operation but im sure it does. The pop off was set wayyy to high, the high speed needles were worn, an there was crusty build up on the inside of the carbs. Not only that but gas would leak out of the atmospheric vent. Can some one explain that one to me? Ill post pics of the removed piston an carb guts tommorow night. Advice is needed
06-05-2008, 12:02 AM #2
If you are still running the stock fuel pump, then thats your problem, aside from prolly needing a carb rebuild.
06-05-2008, 01:26 AM #3
- Join Date
- Jul 2007
- Cedar Rapids,Iowa
Take a good look at the small screens inside the carbs, If the diaphram has a small tear it would allow fuel to the other side of it.
06-05-2008, 11:06 AM #4
The screens look fine, like they were replaced, but they cheaped out an didnt do the whole carb job deal. I placed the diagphram on a flash line an u can see pinholes in it. Hence why gas was leaking out of the carbs. Pics of the diagphrams an piston will be posted later tonight.
06-28-2010, 08:42 PM #5
- Join Date
- Jul 2007
- Baytown, TX
DIAPHRAGMS CANT BE TRUSTED
just ask any baby boomer!
06-28-2010, 09:43 PM #6
If the needle is worn, it wont seat correctly and will let gas thru just as if you held it open with your finger. or as if the spring to keep it down was broke,missing, or bent or in your case, the needle was worn n crusty!. As the temperature outside rises, the heat causes the gas to expand and can move without the ski running.. guys recommend that your turn the fuel selector to the off position when not in use.
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