Take Two update
Yesterday I hit the garage with all of my new top end rebuild parts. I had the pistons soaking in Chem Dip for a week to remove the carbon buildup. Took the pistions out, brushed them with a medium bristle toothbrush and they look great. I took advice from a couple of guys who know more about two strokes than I do and sanded, then polished the piston crowns. 2000,400,1000 grit paper then red buffing compound on a cloth wheel. I didn't take them to mirror finish but a good high gloss. Set those aside for later.
Grabbed the heads and flatted them. 400 grit paper on Wifey's marble top sideboard in the dining room. (She was gone of course)
Then grabbed the cylinders and honed them with 500 grit stones and light oil. I honed them just enough to deglazed the cylinder walls and re-establish a light cross hatch pattern. I mic'd them afterwards and couldn't measure a difference.
After honing they got the same decking treatment as the heads. End result nice and flat. Should be able to get a good seal with metal to metal plus the O-rings.
Then into HOT soapy water. Wifey still wasn't home and I thought about putting them in the dishwasher. Used the sink instead and good thing because as I was moseying back to the garage with my freshly washed parts she was pulling in the driveway. The dishwasher would have another 30 minutes left on it's cycle and I'd be busted.
With everything clean it was time to gap the rings. They all checked at 12-14 thousandths right out of the box, so no filing needed.
Reassembled, torqued everything to spec, set the carbs at 1 turn out on the pilot fuel needle, jets at 330, needle 1 notch to the rich side. Timing at 26 BTDC and 7 degrees retard. It started on the second try and all 3 cylinders firing
I brought it up to temp and had it running for a little while. No leaks, no problems
That was all for yesterday.
This morning I decided to see If I could getting closer to correct running
Regapped the plugs
Put in 350;s
ran better but not there yet
Set the needles to full rich
ran better but not there yet.
Checked my messages at the arctic cat forum and had timing settings from one of the race guys
32 to 36 initial advance
retard all the way to 15 at 8500 rpm
set over rev limit at 9250
Ho Leeeee Chit it SCREAMS like a banshee now Still need bigger main jets or put on some restriction in front of the carbs to richen it up a little more.
I backed off the timing and rev limit to 20 degrees full and 8000 rev limit until I get the carbs a little closer. No sense in melting it down before I get to run it.
I sett he body on and called it a day.
Off to mexico tomorrow for work, then a bit more tuning next weekend before I start packing Casa Busy for the move.