Super XL Problem

[oldwoodsplitter]

I put new cylinder, piston and gas tank on the Super XL I had bought last year. When I cranked it up a two weeks ago after this work, it ran fine but the sprocket bearing and race were out of round and were heating up. I ordered a new sprocket, bearing and race and installed them Friday.
Saw was still running good. I started cutting some small trees down on my property. It ran really good for about 20 minutes then started acting like it was starving for fuel.

I replaced fuel filter, fuel line and spark plug. I put a new duck bill valve in the gas cap. I took the carb apart and couldn’t see any issues. A little bit of trash on the inlet screen and that was it.

So I think I got some bad gas or I developed an air leak somewhere. I replaced the cylinder/crankcase gasket and both crankshaft seals last year.

So, next I will try fresh gas.
Then I will try the gaskets at the carb/Reed valve and reed valve/crankcase locations.
After that I will put a new carb kit in it.
I could swap my carb from my other Super XL and try that to see if it is the carb.

I am at a loss because it was running so good at first.
Now it will idle but sputters when I open the throttle.
I have tried several times to adjust the carb since it started running bad but no luck so far.

Any other suggestions would be appreciated.

[oldwoodsplitter]

Forgot to say this is an SDC 62 carb

[oldwoodsplitter]

Could be the crankshaft seal on the drive side got too hot and was ruined when I had the sprocket bearing problem

[oldwoodsplitter]

Checked the crankshaft seal on the sprocket side and I had put the wrong seal on there. I put a SKF 6120 instead of a 6130. I guess I need to check the flywheel side to see if I swapped both.
I guess the seal was okay until it got hot. It is .062 inches difference on the outside diameter.

[oldwoodsplitter]

Looks like the seal fixed me up. Got the saw to crank and do more than idle. I will be getting a Mityvac pressure vacuum pump eventually so I can pressure test. Made up some gaskets and blanking plates today. Cheapest place to get a pump seems to be eBay.

[farmer1]

Thanks for the info.