Even wounded

[87CR500Rider]

It was still faster than a 450.

[M.F.D.B.]

SHEEIT, that things still got 2 years in it...bring it to Dumont this weekend and see if you still think the same...

[87CR500Rider]

SHEEIT, that things still got 2 years in it...bring it to Dumont this weekend and see if you still think the same...

A little JB weld should do it 'eh? I have no idea what Dumont is but I doubt I would think any different at the end of the day.

[87CR500Rider]

Oh yeah, I forgot to post the other side of the piston.

[south central hoon]

Awesome! could you heard it? how much time was on the motor? is the bottom end beat also?

great pics.

[87CR500Rider]

I honestly couldn't tell you. The motor made no weird noises. The last moto it ran we beat the snot out of a gate full of 450s in the Over 40 class. I bought the bike, did the usual tires, chain and sprockets, rebuilt the forks and rode it. It's never given a mechanical problem since I bought it about a year ago. Besides the water pump housing rotting away, the bike was running fine when I pulled the jug off. Scary huh? I'm pretty sure it's been resleeved cause the bore is like 89.006 and I'm not sure they did a good job putting the sleeve in. I've never had a resleeved cylinder so I couldn't tell you what a good one looks like but this one just doesn't "look" right. I'll take some pics when I get back home and post them. The crank feels tight and looks good. That being said it's still getting rebuilt or replaced with a new one.

[nmdesertrider]

just drill a hole at the top of the crack and keep using it

[kkvslayer]

just drill a hole at the top of the crack and keep using it

Don't forget to cover the crack with JB weld while your at it,You'll be good for another 450 beating

[south central hoon]

I honestly couldn't tell you. The motor made no weird noises. The last moto it ran we beat the snot out of a gate full of 450s in the Over 40 class. I bought the bike, did the usual tires, chain and sprockets, rebuilt the forks and rode it. It's never given a mechanical problem since I bought it about a year ago. Besides the water pump housing rotting away, the bike was running fine when I pulled the jug off. Scary huh? I'm pretty sure it's been resleeved cause the bore is like 89.006 and I'm not sure they did a good job putting the sleeve in. I've never had a resleeved cylinder so I couldn't tell you what a good one looks like but this one just doesn't "look" right. I'll take some pics when I get back home and post them. The crank feels tight and looks good. That being said it's still getting rebuilt or replaced with a new one.

you were racing with that???!!! these motors are soooo awesome! I would think you would have to have some pretty nasty piston slap sounds from the looks of that skirt.....

[M.F.D.B.]

Most people would never notice the slap since it starts out minimal and slowly creeps up. Also, at least 50% of the bikes ive seen are lacking one or more exhaust mounts so they would never hear it over the rattley ass exhaust!!

[south central hoon]

yeah, i am guilty of the rattling exhaust too... I like to think that i can hear motor sounds over that though.

[MrDude_1]

i fixed my rattly exhaust with a couple new springs.....


and now i know i have some piston slap... LOL.

[M.F.D.B.]

I never noticed how bad my piston slap was until I rebuilt the motor the first time...

[87CR500Rider]

I honestly couldn't tell you. The motor made no weird noises. The last moto it ran we beat the snot out of a gate full of 450s in the Over 40 class. I bought the bike, did the usual tires, chain and sprockets, rebuilt the forks and rode it. It's never given a mechanical problem since I bought it about a year ago. Besides the water pump housing rotting away, the bike was running fine when I pulled the jug off. Scary huh? I'm pretty sure it's been resleeved cause the bore is like 89.006 and I'm not sure they did a good job putting the sleeve in. I've never had a resleeved cylinder so I couldn't tell you what a good one looks like but this one just doesn't "look" right. I'll take some pics when I get back home and post them. The crank feels tight and looks good. That being said it's still getting rebuilt or replaced with a new one.

you were racing with that???!!! these motors are soooo awesome! I would think you would have to have some pretty nasty piston slap sounds from the looks of that skirt.....

Yep, never intended to before I got through rebuilding everything but I did. The bike made no weird noises. Won 7 out of 7 motos on it in the over 40 class then the water pump started leaking. I raced a CRF450 in the 8th moto and after fighting hard to pass my way to the front, finally got there and DNF'd. Yeah, 4 strokes are "better" Say what you want, that 450 is a freaking turd. Like I said, "still faster than a 450" with a top end like that.

[M.F.D.B.]

If anyone was able to "hear" a small crack in a piston skirt or a little blow by I think Honda among many others would be "bidding" to employ them...

[britincali]

That 89 I tore apart wasnt rattling at all, and it had a 2" crack in the piston.

[M.F.D.B.]

Hell I welded both rings and squished the dome in a Wiseco once and it was the quietest motor ive ever had. Thing ran 80% of new. Still enough to smoke a 450 in a drag race.

[Balaclava]

that's awesome...

[87CR500Rider]

Hell I welded both rings and squished the dome in a Wiseco once and it was the quietest motor ive ever had.

You might be on to something

[M.F.D.B.]

You might be on to something

These guys beat me to the idea years ago...

I guess rings were just to much of a PITA so they stopped using them...hahaha