I see now how you can drive the screw on the mandrel into the sanding rolls. I thought the screw part was for the fuzzy abrasive things.
I found that some green grinding discs, likely silicon carbide, were the fastest at grinding steel over a burr, sand roll, and pink grind stone. Still it took like 1.5hrs to open the rear of the muffler, and 4 stones.
Oil it and full rpm, adjust pressure accordinglyMaybe I didn't push hard enough, or use an aggressive enough burr, or use enough rpm. I used a double cut at slow to mid rpm with light pressure.
I got a compression tester. Only problem is, how do you test over 170psi in a 90cc saw without hurting yourself? That's where I couldn't pull any more on my 2188. The way I figure it with simple numbers: 2" piston, 3"sq of surface area with 200psi on it = 600lbs of force. If the starter is the same diameter as the crank, then you're pulling 600lbs. Do you guys use a drill for test cranking high compression big saws? I'd think that would undo the flywheel nut.
I got a compression tester. Only problem is, how do you test over 170psi in a 90cc saw without hurting yourself? That's where I couldn't pull any more on my 2188. The way I figure it with simple numbers: 2" piston, 3"sq of surface area with 200psi on it = 600lbs of force. If the starter is the same diameter as the crank, then you're pulling 600lbs. Do you guys use a drill for test cranking high compression big saws? I'd think that would undo the flywheel nut.
Pull harder[emoji51] worst I ever did was a 62mm 088. 2188/390 was never a problem to about 220.
A decomp from a 390 doesn't pop out as easily. So ya knowTried to fire up one of the 372's the other morning in single digit temps. It would pop the decomp shut after about one revolution. I don't remember where the compression ended up on that one but it's probably 210+
Usually pulls over easy but it didn't like the cold temps. It did start when I quit being a sissy about it...
I think that's what's in it...hell I never use the decomp but I needed it Sunday.A decomp from a 390 doesn't pop out as easily. So ya know
Tried to fire up one of the 372's the other morning in single digit temps. It would pop the decomp shut after about one revolution. I don't remember where the compression ended up on that one but it's probably 210+
Usually pulls over easy but it didn't like the cold temps. It did start when I quit being a sissy about it...