BannedCR500Riders.com

It was still faster than a 450.

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

M.F.D.B. wrote: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.

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

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

great pics.

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.

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

nmdesertrider wrote: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

87CR500Rider wrote: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.....

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!!

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

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


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

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

south central hoon wrote:

87CR500Rider wrote: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.

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...

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

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.

that's awesome...

M.F.D.B. wrote: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

87CR500Rider wrote: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