won't idle.

marty

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stiehl ms 250. new seals, rings and red caulk on cylinder base. runs like a beast, but can't get it to idle. note: fuel burped on fuel line when taking off carb (good crankcase pressure). carb cleaned and tried a new carb. no change. did notice slight hesitation/dogged from low to high rpm.
 
Did you give the cylinder liquid gasket at least 24 hours to cure before trying to start the engine?
Amazon no name carb?

My sequence would have been pressure and vacuum test after liquid gasket seal to confirm air tight, clean and kit original Stihl carb (no ethanol fuel here) pressure test the fuel line and carb. Use base settings on H&L- fine tune by ear from there.
BUT- if you are dealing with an aftermarket carbs- some of those do not start to run near right until 2-3 turns out on the L in particular.
 
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