Stuck Ring? Or something else?

FyrHazard

FyrHazard

Ski Eat Sleep Repeat
Location
Iowa
I am definitely testing for air leaks when I put this thing back together.

Checked the reeds last nite - no problems there. I'm starting to lean towards lean seizure - although this is hard to swallow becuase the plugs don't look burnt. I was WOT when it happened. I think part of the reason it looks so bad is from limping it back to the dock on one cylinder.
 
FyrHazard

FyrHazard

Ski Eat Sleep Repeat
Location
Iowa
Well I got some ported cylinders and pistons from someone on here and got her stuck back together. Pressure tested the cases and didnt' find any major leaks - although I checked my blaster motor and found some pretty bad case leaks and bad crank seals.

Checked the jetting, and it was 135 Main and 115 Pilot. Isn't that stock jetting? Probably should've checked this before I went running it, but who runs stock jetting with an a/m head and pipe!?!? Anyway she's now got 145 main and 120 pilot so we'll see if I can't melt it down again.

Thanks for the input guys!
 
Last edited:
V

vrizi

If I had to take a guess here I would say that the head bolt was torqued to tightly and did not allow the cylinder wall to expand at the same rate as the piston causing excessive wear at that point. Torque on the head is not very high to allow for expansion. These torques should be checked about every 20 hours of riding.
 
blaster4life

blaster4life

couchez r 4 living rooms
Location
illoinis
vrizi said:
If I had to take a guess here I would say that the head bolt was torqued to tightly and did not allow the cylinder wall to expand at the same rate as the piston causing excessive wear at that point. Torque on the head is not very high to allow for expansion. These torques should be checked about every 20 hours of riding.
Click to expand...


wow i have never heard that
 
FyrHazard

FyrHazard

Ski Eat Sleep Repeat
Location
Iowa
wouldn't that take forever to pump up? I made a plate with a gauge and shrader valve that bolts onto the carb hole. works pretty good with a compressor
 
FyrHazard

FyrHazard

Ski Eat Sleep Repeat
Location
Iowa
Yeah, post #22, pressure tested it and didn't find any major leaks. I think it was simply too lean. Been out a few times now with the new jetting and haven't had any problems yet.
 
yamaslut

yamaslut

kill it
Location
Daytona Beach, Florida
vrizi said:
If I had to take a guess here I would say that the head bolt was torqued to tightly and did not allow the cylinder wall to expand at the same rate as the piston causing excessive wear at that point. Torque on the head is not very high to allow for expansion. These torques should be checked about every 20 hours of riding.
Click to expand...

the flag is going up on this one.... not true

I have way over tightened my head before and nothing... I know of one engine builder that recommends you tighten in about 50% tighter than the ADA manual says. I ran mine like that for some time w/ no issues, until I realized it did not need to be that tight from some one else. I never torque my head after the initial install either and have never had any problems...
 
blaster4life

blaster4life

couchez r 4 living rooms
Location
illoinis
yamaslut said:
the flag is going up on this one.... not true

I have way over tightened my head before and nothing... I know of one engine builder that recommends you tighten in about 50% tighter than the ADA manual says. I ran mine like that for some time w/ no issues, until I realized it did not need to be that tight from some one else. I never torque my head after the initial install either and have never had any problems...
Click to expand...




the flag has been raised :bsflag:
 
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