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I timed both your vids with a stopwatch.... I'm getting 7.1 seconds consistently on both vids. I timed the first 4 cuts. The first cut you made with the 8 pin I got 7.3.... then all 7.1. :dunno:

I dunno why it's the same.... still a screamin saw!
 
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The saw still sounds WAY rich to me for timed cuts. Remember how much faster your 288 was after leaning it out at the GTG? I think that's the case here as well. With a warm saw, hold it WOT, lean it out until all 4-stroke is gone. Then quickly back it up until it starts to 4-stroke just a little. No more. You'll get your fastest cut times there. I did richen it up though for hard work.
 
It shouldn't take that long to clean out. Have you been through the carb? Did you replace the crank seals? It seems odd to me that it would run that rich for several cuts, and then go much leaner. Does it hold a tune on the H, or does it hunt around? Does it rev to the same RPMs each time you go WOT?
 
The saw was cold, took a cut or two to warm up. I did do the carb, did not do crank case seals, holds vaccum and pressure good. It seems to hold a tune fine so far, but everybody here has seen almost all the run time the saw has on it so far...
 
It shouldn't take that long to clean out. Have you been through the carb? Did you replace the crank seals? It seems odd to me that it would run that rich for several cuts, and then go much leaner. Does it hold a tune on the H, or does it hunt around? Does it rev to the same RPMs each time you go WOT?

I thought the same thing in that vid, the tune seemed to change a bit? But could just be the vid? Don't know.
 
Sounds like you're good to go then. I expect to see you lay waste to the Poulans next time your encounter them:clap:




I'm gonna have to get a 4200 and put as much work into it as there is in that one and show youall how the cat ate the butter!!!LOL


Congratulations Mike!

You've got that one looking and running good.


Mike
 
Nightly update...

The finished products after the lathe work, not too bad for a parts guy...

DSCN2692.jpg


So I go to check squish, cut my gasket, install piston (less ring), apply solder (.030")....

DSCN2691.jpg


and try to install cylinder. I had to chamfer the cylinder skirt that extends in to the case. The first time I tried it, the piston was sticking at the bottom of the bore, I knew right away what was happening.

DSCN2703.jpg


Checked squish, ended up .026", little more than I wanted, but I can always adjust that later if needed with a thinner gasket.

Next up was checking where I was at with the port timing. I printed off a timing wheel and stuck it to a cd, stole that idea from somebody else here.

DSCN2704.jpg


My numbers right now are:

Exhaust 100
Transfers 124
Intake 80

Not too far from where I want to be. I'm gonna raise the exhaust and the transfers a bit, intake is good where it's at.

can someone explain how the timing is determined with that wheel on the crank? I don't know going to be porting a saw soon still getting instructions from here for 372xp
 
Nice build man, kinda jealous you have the tools at your disposal to do what you want...I gotta pay people to machine my junk....
 

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