Hello,
Today I had a problem with my Jred 670. First time I used it. Bought as second hand. Sound Ok, Idle Ok, speed Ok but the problem is the chain sometimes stop is the wood, specialy the knots, and the motor low down in rounds.
I did :
New fuel filter + New fuel hose
New Carb membranes (I touched the little throttle inside)
Repair admission pipe as I could (seems to be ok because Idle is Ok)
Changed old piston by a new Husqvarna 268 (same one)
Changed impulsion line by a regular fuel line with a little spring to old around the pin
Vent tank changed
Is the carb could be the problem (not enoughly gas) or the little throttle in the carb is too high ??
Thanks if you can help me.
(Sorry if I did mistakes with my english language, should be cool to correct

)