Archived Posts

Post by **Admin** » Sat May 17, 2008 8:46 pm

Ouch!

Post by **Admin** » Sat May 17, 2008 10:20 pm

Baby got hot, eh?

Post by **Admin** » Sun May 18, 2008 1:20 am

You might be just a a bit lean, there. I had an H2 wristpin pull out of a piston once....not pretty.

Lane

Post by **Admin** » Sun May 18, 2008 11:42 pm

I found the piston pin, you can see it at a wierd angle along with the mangled con rod.

I'll report more once I get the engine apart and ispect more damage, for sure the crank is done.

Post by **Admin** » Mon May 19, 2008 9:30 am

Hey Ralph,

Ouch! Sorry to hear it (particularly since I want to blatently rip off your set-up & jetting)! I hope it's not a costly fix.

Jim

Post by **Admin** » Mon May 19, 2008 11:03 am

Ralph,

That looks like an easy one. I think JB Weld will cover that hole in the piston, and that con rod is definitely within factory spec for straighness, so I wouldn't worry about it. You'll be back running in no time.

Kevin

P.S. Anyone who thinks I am even remotely serious needs their head examined. Ralph knows I'm joking, and I'm (and I think he is too) pretty stoked that he got so many years out of racing that engine before having to do a major rebuild.

Post by **Admin** » Mon May 19, 2008 3:42 pm

Bummer Ralph!! Good seeing you at Willow though....
Willie

Post by **Admin** » Mon May 19, 2008 5:17 pm

Yep, that's what my H2 rod looked like, too. It was wedged into the crank web so tightly that I couldn't move it with a sledge hammer.

Lane

Post by **Admin** » Sun May 25, 2008 12:09 am

Final gory pics of carnage after engine disassembly.

The piston pin was ripped out of piston pin bosses, and somewhere the con rod small end was severed from the rod.

The resulting reciprocating saw toasted my cylinder wall with deep gouges.

Note the scuffing from seizure, and nice groove cut in piston skirt from flailing con rod stub.

I don't doubt that the piston seized, but I don't really think it was from lean mixture as the right cylinder looked fine.

Interestingly enough when I dissassembled the top end the left "seized" cylinder was completely devoid of any two-stroke oil residue, compared to normal residue present in right cylinder. Think I better check out the oil pump, lines and check valve.

So now the rebuild process begins; I've got a spare crank sent out for rebuild, and I'll send the left cylinder out for re-sleeving.

That's racing!!!

Post by **Admin** » Sun May 25, 2008 2:24 am

That piston will surely make for a nice conversation piece.

Keep an eye out for what might've caused this mishap and let us know what you discover.

Post by **Admin** » Sun May 25, 2008 9:23 am

Nasty looking stuff you have there, better you than me!

Post by **Admin** » Sun May 25, 2008 11:37 am

oops that does look bad.

Post by **Admin** » Wed May 28, 2008 1:29 pm

Ralph.... Dude, don't do that anymore. It's hard on 'em

Post by **Admin** » Wed May 28, 2008 5:24 pm

"It is but a flesh wound!"

"But you have a hole in your piston, a broken and bent connecting rod, and horrible gashes in your cylinder walls!"

"Alright, we'll call it a draw!"

Sorry for the bad Monty Python paraphrase.

Post by **Admin** » Wed May 28, 2008 9:14 pm

Can anyone recommend a good place to pick up a set of Dunlop racing tires?

Archived Posts

Oh No

That looks like an easy one.

It is but a flesh wound!

Racing Tires?