No offense, but you admit you're a Rookie and you didn't even know how to take a proper compression test. Now you're going to port the saw.
Odds are you're going to ruin it- I probably would too. This is a nice Dolmar 5100 that seems to be in good shape- its going to be a clear cut case of saw abuse! Why not start on some cheapo used saw or one of the $99 factory bebuilt saws?
I actually should have ruined my first porting job (DCS510) and with the wild freeport it had some people said it would not run. It ran alright and better than stock. Those same people are still learning too by the way...
And the only reason it had a free port was from the router saga. At the time, I was so fired up with what was going on, after I made the first cut with the router and it left a super clean cut, I got so excited I jammed the bit against the lower part of the exhaust port to see what would happen!!! And guess what? It cut out a super clean 1/8"-3/16" worth of material. And some "professionals" so to speak, said a router couldn't cut aluminum properly.
Yes, I have never used a compression guage on a 2 stroke. I'm still learning about 2 strokes. But as far as messing up a port job...I know enough to know what not to do.
Here is the 5100 with a mild porting job on the exhaust. I took it to the max and left close to about 1.5mm of area left for the piston skirt. But did not touch the port walls that much. I'll be working on the intake this morning (working the exhaust a little more) and I won't be touching the transfers just yet. That's for another time. I won't be touching compression either. It's stock numbers are high enough for a hot work saw. I ordered some chains by the way from Oregon. I can't wait to slap these chains on the new works saw.
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Here is the ported cylinder for the straight 6 in my Chevy C10.
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Like Nathan said, I'm hands on.
Rick
