JONSERED 2065 RUNNING ISSUE

I Have a jonsered 2065 that has been brought to me by a fellow worker,who has used it for firewood duty,this saw has been excellent until just recent,the issue is it will start and run ok for a few minutes ,then it will pop/backfire through the carb also idle appears to be high tried adjusting low speed richer and adjust idle down,but still wants to idle high,I am suspecting a air leak any ideas guys,thanks in advance.

 

Go to your local Auto parts store and see if they'll let you use a pressure tester on the jug.

 

Thank you upstatewoodcutter,I have a vacuum tester will pull a vacuum this weekend on it when i get it cleaned and ports sealed off.

 

I'd be considering a carb rebuild.

 

A carb rebuild should also be on your list, that would explain your idling issue.

 

The only 2 saws I've ever had that backfired, had bad coils...
Check for leaks first of course...
But that's just an FYI..

 

thanks for the replies folks,been around a lot of small and big enginesin my lifetime,work as a heavy equipment mechanic, when this saw backfires it quits running immediately i am leaning towards a crank seal or seals,cleaned it up today will dig into it this weekend and post back my findings,thanks again

 

Last saw that backfired on me had a sheared flywheel key