Saw fading on full throttle

[Frax]

I'm kind of new to saw repair. But so far so good. The most challenging so far has been a rebuild of a 200T that took a 70' fall onto rocks many many moons ago.

It's got a new chain brake, new air cover filter, new fuel lines and a new fuel tank and fuel pickup. Everything has been cleaned minutely.

I don't have the means to test the crank case yet, but it seems solid. I didn't rebuild the carb either, but I did test for leaks.

It was running like a champ, but lately it seems to fade on full throttle. If I goose the throttle it recovers, but it still has that fade from time to time. It idles solidly.

Everything I read suggests a fuel problem but this seems unlikely since everything about that got changed out.

Ideas?

 

[Chainsaw Jim]

I'm kind of new to saw repair. I didn't rebuild the carb
Everything I read suggests a fuel problem but this seems unlikely since everything about that got changed out.

Ideas?

Rebuild the carb with a new kit and then you can say you changed everything. Your problem will also disappear when done.

 

[alexcagle]

Yes, and check the impulse hose. They pop off pretty easily.
Since it took a fall, it could have knocked a hole the front of the impulse hose. It is very close to the intake retainer block and can abrade a pinhole in the hose.
As cheap as they are out of china now, I'd just buy a new carb.
That carb has a non-serviceable accelerator pump plunger. They gall over time and can leak air causing problems.

 

[HarleyT]

Go through the carb correctly, and install a new kit, don't just put a kit in it, the passage under the needle
and screen is likely partially clogged.

 

[Chainsaw Jim]

Check the muffler screen too. Those things get mucked up pretty easy on these models.