BannedCR500Riders.com

so... when I had my nasty crash the throttle got stuck open for a LONG time
well, today I was test fitting shanmans headstay and getting started on putting the bike back together (cleaned airfilter and started putting subframe back on). I moved the kicker over to fit my hand through and then discovered I could push my kicker by hand... I busted out the compression gauge and the results were less than good.

so I tore it apart and lookie at what I found cracks and all

Thats the only spot that smeared like that?

yup, weird, huh..

Very

who did the machine work on the bore ?

hey bob what you think of this idea- if the bikes is full throttle laying on its side for 5min half the gas would be running out the overflow hoses and probly only getting half the gas...and danny had that carb with extra small main jet, probly wasnt enough fuel in the bowl for the powerjet. seems like this would be the same as shutting the petcock off and holding it wide open untill the bowl is dry- just before the bowl is empty it gets real lean but will still run

you think the bearings got cooked?

shitty danny... I need to do a comp check on mine before i even think about trying to get it tuned

Your lucky, alot of times the piston will shatter and explode in a situation like that.

well, my rod bearing is toast and my stator side seal was leaking (which might be why it only seized on that side).
I knew I needed a rod bearing, but now its worse, when I was turning it by pushing the rod it was scraping the cases just a tad. So I split the cases and gutted everything, so now I have a 23lb motor for gen-4 mockup and I got my gen-1 down to the frame. MFDB is gonna bead blast that gen-1 frame for me since I'm not too into the polished look.


I don't know why everyone is always so afraid to split the cases, I got everything torn apart and inspected in about 2 hours. I put the kids to bed and went for it!

Thats is a really good motivation to wire a lanyard kill switch, man now i'm all freaked out.

How long was it screaming for Dan?

hard to say, I was hurt pretty bad, but well over 2 minutes

You were down two minutes? I gotta get one of those 250 CDIs!

na, I was down for a few seconds, but my kill switch was damaged and the throttle housing crushed in the WOT position. I tried to stall it out, but then it did a few circles around me, then took off. it finally died while on its side spinning itself around in circles. I asumed the bown ran out of fuel, but it looks like a lack of compression is what shut it off!

It would almost be worth it if you got that on video

I KNOW! There is never a camera around when the crazy shit happens!

well guys, I did that topend in august 2006 and hammered the crap out of it! Its not like it quit because of shitty machine work or a refective piston, I definitly killed it. I honestly couldn't be happier, I got some serious hours on it and it still had no signs of any real blow by! MFDB shitcanned a couple pistons in the time I went through this one. It was really time for a new one anyway, and since it was a .5mm over bore, I have plenty of room. Infact, I also have a spare topend with a 2.00mm over piston that just needs some rings, I might just re ring it for the trail season while I get my ported jug back together.

Just give me the piston when you give me the frame for bead blasting and it will be good as new, just ask Britt...

ok, I will unstick those rings, blast it and run it! lets see how long it lasts!

dannygraves wrote:
ok, I will unstick those rings, blast it and run it! lets see how long it lasts!

Dont forget to drill holes at the tip of every crack...then use Bondo...

bondo! naaaa, jb quik all the way!

dannygraves wrote:bondo! naaaa, jb quik all the way!

Its like an 18 year old girl, you can "tap it if you wanna"...

looks to me it had more to do with your rod bearing possibly even a bent or slighty twist rod. the crown of the skirt should be square to the big end of the rod or crank. if not the skirt will load to one side in the cyl.and ruinin the piston. every time we mount a piston on a rod weather new or old we put it on the rod aligner to make sure the skirt is square with the rod,hard to do on a 2 smoke but all-in-all sounds like you allready found your problem (bearing)