xrjoe

to do that, block exhaust and plate intake, check pressure from plug, what kind of pressure, for how long? thanks for the demise pic jeff.

nothing shows excessive wear, but its original, and by time alone, im looking to replace it. im still looking for something conclusive, its something weird, next up, water pump impeller and drive...

yes its stock

well, I got the crank out, finding time is tough, inspection of seals reveals center seal to be sloppy, looks to move/wobble too much to me, this is listed as the labyrinth seal, looks to be machined to sit tight to crank, outers seat tight, seems like the lean condition would pertain to outer seals, what are the thoughts/options with this crank?

also I want to say, thanks for everyones interest, problems like this are always good to hear others thoughts, in relation to others experiences, just wasent an option when I was younger, these forums are an incredible asset.

yeah, I hear ya

for what its worth, I filled the crank case with diesel solvent 2 days ago, both cylinders, and theres no loss from the initial level, if the seals were leaking under load, I would suspect they wouldn't hold liquid either, test obviously not under pressure, but being the clutch side, a pull of air would include trans oil, there was no sign of loss on dipstick.

from the grommet or bottle itself? seems like that would affect both cylinders.

too late, top is disassembled.

a buddies problem, running mostly stock motor, with Toomey t5's, stock carbs with 350 main jets, stock needles, weisco pistons, cool head. hes run it all over glamis, not counting numerous trips, then under a good warm daytime load, it scorched the right piston. he got the motor top end redone, new weisco's, and out in similar conditions, with a slow relatives daughter riding it, same clutch side piston comes out with a hole and top ring landing melted down, supposedly she never rode hard, he never had a chance to check the plugs for any lean condition, im having trouble beliving a hole could melt at lower power level activity, theres no visible vacuum leaking around carbs, if the crank seal was pulling air it would include oil from the trans right? anyway im helping to hopefully prevent reoccurrence, talked to Toomey about correct jetting, his needle kit has slimmer needle and 280 main, for sea level operation. so im wondering if im overlooking something else, to check seal integrity, would pouring solvent in case to monitor for any loss indicate seals ability, well enough to rule out failure?