Exhaust How to tell if you blew a gasket and SPARKS on exhaust?

Slaquer, I just want to point out that the higher number in the ratio indicates less oil in the mixture, not more. At 50:1 or 60:1, your engine is getting very little oil to lubricate the moving parts.. more friction.. more heat.. likely it will not last very long. I run mine at 25:1 with good success, though others running a bit higher or lower than that. When reading the ratio, 50:1 represents 50 parts of gas to 1 part of oil... 25:1 would be 25 parts gas to 1 part oil or 50 parts gas to 2 parts oil. I would say you are using about half the oil you need in the engine. Hope this helps.
 
heXed said:
I run mine at 25:1 with good success
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I also run mine at 25:1 with good success.
25:1 seems to be the magic number to squeeze longevity out of these 2-stroke Chinese bicycle engines, when running higher duty cycle.

I have run 35:1 but there was a noticeable reduction in the life of the cylinder bore and piston rings.

If you are just putt-putting around; operating the engine at low duty cycle, you can get away with 50:1 but the jetting would want to be optimal, otherwise you'll tear up the cylinder bore and rings.
 
one jerry can, one mix, 50:1. chainsaw, pole saw, china bikes, hell, i even top up the 4stroke lawnmower and brushcutter with it! even the 650 gets the occasional splash when i know the servo is out of range.

i dont putt-putt around, either. 2 hours at WOT is a low duty cycle ONLY if you consider it might sit next to the shed for a week or more at a time between runs.


what kills my engines? over doing modifications, blown crank seals, and piston ring locating pins. no oil on earth will prevent that from happening.


and lending them to people that have a habit of forgetting oil altogether...
 
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