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Old Today, 02:30 PM   #1
triprop   triprop is offline
 
Join Date: Mar 2024
Posts: 15
help with bogging just past idle

pentora 250 with nibbi PE30 that has always run perfect stock. went out and was running great for over 30 minutes and then started to bog real bad just past idle. turned it off waited a couple minutes and started it back up and was running fine, just as i got back to the house it started bogging again. do you think that is more likely a pilot jet or a air/fuel screw thing?


 
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Old Today, 04:30 PM   #2
TominMO   TominMO is offline
 
Join Date: Sep 2021
Location: De Soto, MO
Posts: 1,937
If it ran fine at first, then later on started bogging, I'm thinking you need to do a valve adjustment. Exhaust valve stem heats up and lengthens, valve doesn't close completely, loss of power. It may be something else, but this would be the first thing to check. Also check the intake valve clearance too of course.
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