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Matty
PostPosted: Mon Jun 20, 2005 10:56 am  Reply with quote
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Jeff wrote:
I just about laid the damn thing down before I realized what was happening and grabbed the clutch.


Oh and glad it didn't happen Friday night riding two up!

-Matt
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Derrick
PostPosted: Mon Jun 20, 2005 10:57 am  Reply with quote
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You should not have a stripped mixing screw. I mean, I doubt you have this problem.

Jeff and I had talked about this earlier and he had mentioned the crossed threads on his carb.
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jsyx
PostPosted: Mon Jun 20, 2005 11:41 am  Reply with quote
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i should have excluded the last sentence from the quote, i'm QUITE sure i wouldn't have this problem.

BTW, what exactly is invovled with a rebore? Is the cylinder totally refilled(for lack of a better word) and re-machined to the same diameter? Just Curious.

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Matty
PostPosted: Mon Jun 20, 2005 11:51 am  Reply with quote
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jsyx wrote:
BTW, what exactly is invovled with a rebore?


Short answer. You buy the next size up piston (you can usually get them up to 3 times oversize) and the shop will bore out the cylinder to fit the slightly larger piston.
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My Pal Foot Foot
PostPosted: Mon Jun 20, 2005 12:02 pm  Reply with quote
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Is your auto lube working correctly? It was my first thought when you said that your plug was black. But Derrick is right, if you checked your plug after you siezed it wouldn't be a good indication of what was really happening in your cylinder at full throttle.
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Jeff
PostPosted: Mon Jun 20, 2005 1:00 pm  Reply with quote
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Autolube seems to be working just fine.
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Jeff
PostPosted: Tue Jun 21, 2005 7:13 pm  Reply with quote
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Here are a couple of pictures of the piston. The first one is the the port side. The seize pattern is almost kinda pretty:




This one is the opposite side of the piston, the exhaust side. This one ain't so pretty:



There is a nice gouge in the jug that matches up with the gouges on the left side of the piston in that picture. Pretty sure it calls for a rebore...
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Moses
PostPosted: Tue Jun 21, 2005 7:40 pm  Reply with quote
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Totally off-topic, but I will ask anyway: What the heck is the piston sitting on? Some dead baby demon, or what? And where can you get them? I have some x-mas present ideas for family members. ;)

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Jeff
PostPosted: Tue Jun 21, 2005 7:45 pm  Reply with quote
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It's a glow-in-the-dark Pikachu knockoff wristpad, duh. I have no idea where you would find one. A dollar store maybe?


Last edited by Jeff on Tue Jun 21, 2005 7:54 pm; edited 2 times in total
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Derrick
PostPosted: Tue Jun 21, 2005 7:46 pm  Reply with quote
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Ouch! No freebie there.

I thought of a couple more things.

Is the timing stock? If so you might retard it a few degrees. I would guess you would want no more than 19 degrees BTDC. I am running my 225 Lamby at 16 degrees BTDC. Very conservative but I don't want to seize. Anything to minimize piston heat.

Also, you should be running premium gas to minimize pre-detonation.
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Jeff
PostPosted: Tue Jun 21, 2005 7:51 pm  Reply with quote
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Supposedly the DR kit is fine at stock timing. Right now I think that poor tuning is my biggest problem, but timing is second on the list. Once I get the parts togther I might want a consult on that Derrick.

I run 93 octane ethanol free gas whenever possible.
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