DAG
Yes, my balls tickled from that landing
- Location
- Charlotte, NC
Out riding today and from the start i noticed the ski was not hitting like it was yesterday. I ride around for about 5min to warm it up come back and replace the plugs take it back out for about 5min and its still running a tic slow. Bring it back in, check my tuning log book and make sure my adjusters haven't vibrated loose. Everything checked fine until i pulled the head. :dead1:
Once lifted the head the carnage looks like a wrist pin bearing or C clip let go. As i just rebuilt the topend not even 20 (10 of which was used to break it in) gallons ago from the lean jetting resulting in the piston meltdown thread. The yamaha wrist pin bearings i ordered actually turned out to be WSM and not OEM, so i figured it was the culprit.
Pulled the jugs and first check to see if all C clips were intact, they were. Removed the C clips from the bad piston and couldn't remove the wrist pin. I had to use a rubber punch to knock it out. The good piston's pin came out like butter. However both wrist bearings looked identical and untouched. (why did one come out so much easier?)
Now that both pistons are off, i was turning the crank by hand and i could tell its not spinning as smooth:grumble: When i slowly spin the front rod from TDC to BDC i can here something rattle and fall down. I have never split the cases before, mainly b/c i dont have a flywheel tool, but i'm assuming the barring are shot? IDK does this sound like something replaceable? or a unaffordable new crank on the way? I still am clueless on what got munched up? i can find zero aluminum shavings.
The carnage report
Need one ADA dome
Need one piston kit
Need crank or replacement bearings
need to figure out why i keep loosing pistons :dunno:
From the looks of it, the cylinder walls look like glass. I can still see the hone marks that were machined 2 weekends ago :banghead: however their is a chip on the intake port, looks like i can get by with a light chamfer
uppy_dog_eyes: maybe?? uppy_dog_eyes:
The good news, i can now concentrate 100% on finding a career :wiggle:
Once lifted the head the carnage looks like a wrist pin bearing or C clip let go. As i just rebuilt the topend not even 20 (10 of which was used to break it in) gallons ago from the lean jetting resulting in the piston meltdown thread. The yamaha wrist pin bearings i ordered actually turned out to be WSM and not OEM, so i figured it was the culprit.
Pulled the jugs and first check to see if all C clips were intact, they were. Removed the C clips from the bad piston and couldn't remove the wrist pin. I had to use a rubber punch to knock it out. The good piston's pin came out like butter. However both wrist bearings looked identical and untouched. (why did one come out so much easier?)
Now that both pistons are off, i was turning the crank by hand and i could tell its not spinning as smooth:grumble: When i slowly spin the front rod from TDC to BDC i can here something rattle and fall down. I have never split the cases before, mainly b/c i dont have a flywheel tool, but i'm assuming the barring are shot? IDK does this sound like something replaceable? or a unaffordable new crank on the way? I still am clueless on what got munched up? i can find zero aluminum shavings.
The carnage report
Need one ADA dome
Need one piston kit
Need crank or replacement bearings
need to figure out why i keep loosing pistons :dunno:
From the looks of it, the cylinder walls look like glass. I can still see the hone marks that were machined 2 weekends ago :banghead: however their is a chip on the intake port, looks like i can get by with a light chamfer
uppy_dog_eyes: maybe?? uppy_dog_eyes:The good news, i can now concentrate 100% on finding a career :wiggle:
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