Air leak at the boot is my guess, pressure vac test.
Air leak at the boot is my guess, pressure vac test.
It looks like something got in the cylinder. Maybe a small metal shaving during reassembly after your muffler mod? Is there evidence of anything embedded at the top of the cylinder in line with the scratches? Or at the top of the exhaust port? Hopefully it ejected it out into the muffler. I'm certain someone on here has seen that before.
I really thought the carb review was going lead somewhere. Are the gaskets still nice and flexible?
Well you did a lot with the H screw but what did you do with the L?My coil is blue and stamped 14,100. So, I thought I'd set the RPM at 14,000 with the tach and go from there.
I warmed it up first by cutting for a few mins. I knew it was rich. I then tached it and she was around 8000 RPM, no load on the bench. So I kept turning it in, 1/4 turn at a time, checking the RPM with each turn. I did this until.....until it wouldn't turn any more....and it was only turning in the 11000 range....perhaps 12000. The screw was all the way in! I don't recall exact numbers but I do know it never hit 13000.
Knowing something wasn't right, I backed the H screw out about 3/4 of a turn and started cutting wood. Honestly, this saw had never cut so good and so fast. After a bit though, it began acting like it was running out of gas....even on a full tank. Thinking that was due to being too lean, I backed the H screw out ~1/4 turn and started cutting again. No problems after that. Saw runs really, really good.
I didn't tach it....but I did shut it down while wide open in the cut....then I pulled the plug. Please see the attached photos. ALSO, for what it's worth, I looked in the plug hole with a flash light....and the piston top is covered with black stuff......except for a small section that would be towards the air filter side....and that was just bare metal.
Can anyone tell me what's going on.....besides of course that I don't know what in the hell I'm doing?
Saw may have had the limiter caps cut off and it may have had the muffler opened up.View attachment 470663 View attachment 470664 View attachment 470665 View attachment 470666
Well you did a lot with the H screw but what did you do with the L?
That's sounds about right especially if it is holding idle.I turned it in until it started to stumble then turned it out to max RPM then went half way between the two. I did this each time I messed with the H screw as I recall.
I've never taken off a clamp like that. It loosens when you pinch the ends together?
What was the throttle response like from idle when you were tuning?
That looks a lot better than I feared it would!Small amount of scoring at the top of the piston, muffler side. See the pics.
That would put it between lean enough to stumble and max idle rpm, which means L is set lean. Normally you want L set to the rich side of max idle rpm, or if it has an accelerator pump then L should be set at max idle rpm. Still, it's hard to see why this would cause the other issue you had.I turned it in until it started to stumble then turned it out to max RPM then went half way between the two. I did this each time I messed with the H screw as I recall.
Yes, it loosens the clamp. However, I get the distinct impression there's a more specialized tool for this job than needle nose pliers. I quit trying to get it off in fear of screwing up yet another thing. ;-)
Throttle response was great....except, at times, it seemed to stumble. But really, that's been months ago and I made so many adjustments, and was so frustrated, that I can't remember all the details now.
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