couple of 026 pro questions

[Mike mandry]

Took down a big black walnut this weekend. About 30" at the base

I used my SXL 925, 026 & SEZ

My 026 is stock except for opened muffler & a WT 426 3 screw carb. 18" bar .325 RS

It runs great, however at full throttle, I swear it has an air leak as it just picks up & screams like its running out of fuel.

When I make cut I usually give it about 75-80 percent throttle before I hit the wood & open it up as soon as it hits the wood. From idle to say 80 percent throttle t seems to run normally. Past that it just screams & wants to keep on climbing.

I put it aside this weekend & did all the limbing with the SEZ, as I didnt want to tinker with the Stihl, or risk running it lean if there was really a problem.

I pulled the plug & muffler tonight & it looks fine. A tad rich if anything.

Perhaps I am just used to my slower running 925 & SEZ

Admitttingly, I have not used the 026 that much yet, but it did not do this when I first got it.

Im thinking about taking it in & having the dealer check it on a tach, or do a leakdown test.

How much should I expect to pay for this (ball park) if I do a leakdown/pressure test, I would pull the muffler & carb myself to hopefully save on labor.

Anyone have any input/ideas ??

 

[Lakeside53]

Don't pull the muffler or carb.. you won't save a penny... Have the saw tached first anyhow. 026's can "scream" - 14k is typical. The muffler is used to seal the exhaust as part of the test and it's generally not taken completely off - just loosened. You just need a pressure and vac test, not "leak-down".

30 minutes of shop time would be on the high side... Before you do anything, check your fuel filter, fuel hose, tank vent and inlet screen in the carb.

 

[Mike mandry]

The carb is new. I might have 4 tanks through it. The filter was replaced when I put the carb on.

I thought perhaps the intake boot had a leak that only shows up @ full throttle, or perhaps the pulse hose had a small leak.

It idles just fine, thats what threw me for a loop.

It just seems when cutting 6" -8" wood that the further you get into the cut the faster it revs. Almost like constant acceleration.