mike0chek Posted May 21, 2012 Report Posted May 21, 2012 so went for a rip yesterday when my bike came to a loud stop. looked under the motor and seen the crank had destroyed my upper and lower bottom end cases. after taking the motor apart i seen there was alot of damage, the rod let go right under the wristpin and destroyed everything in its path. its a 4mil crank with a 421 drag ported head all bought from kevin. the bike only has about 3-4 tanks of fuel through it and im confused about what could make the rod let go like that. im going to upload some pics so i can get some input from you guys (cylinder repairable?, cause of failure, rebuild suggestions, ect.) my mods are below. im new to uploading so hopefully they work lol Quote
vulvafan537240 Posted May 21, 2012 Report Posted May 21, 2012 Running lean, air leak, detonation... could be lots of things. Quote
mike0chek Posted May 21, 2012 Author Report Posted May 21, 2012 http://imageshack.us/photo/my-images/191/1000094l.jpg/ Quote
mike0chek Posted May 21, 2012 Author Report Posted May 21, 2012 (edited) forgot to mention my plugs were a chocolate brown By mchek at 2012-05-21 Edited May 21, 2012 by mike0chek Quote
mike0chek Posted May 21, 2012 Author Report Posted May 21, 2012 bike was running on 93 oct pump gas, is this cylinder repairable? By mchek at 2012-05-21 By mchek at 2012-05-21 Quote
Starwriter Posted May 21, 2012 Report Posted May 21, 2012 gnarly!!!!!!!!!!!!!!!!!!!!!!! You get the award for the most impressive carnage!!!!!!!!!!!!! Quote
mike0chek Posted May 21, 2012 Author Report Posted May 21, 2012 i know ive never seen a case get bombed like that before Quote
So Cal Suspension Posted May 21, 2012 Report Posted May 21, 2012 Holy shitballs... My guess would be a seizure on that side, but could have been a casting flaw on the rod... What brand crank was it? I know you said it was from Kevin, but I didn't see a brand. If you say your plugs were a chocolate brown, that would indicate that you were not running lean. Quote
Dicklez Posted May 21, 2012 Report Posted May 21, 2012 Thats fuckin awesome!!!! Worst ive ever seen. I cant really tell cuz my eyes are goin but is that molten alluminum on the right side in the bottom of the case?? Quote
maskmanLS6 Posted May 22, 2012 Report Posted May 22, 2012 You Might as well take the trans and other parts out of those cases and start from scratch. That cylinder might be salvaged but those cases and crank are junk. Thats the worst rod slingin ive seen yet!!!!! Quote
wacko2000 Posted May 22, 2012 Report Posted May 22, 2012 Wang crank strikes again Did you call and speak to kevin bc your shit is fucked up and Id be pissed Who assembled the engine? Joe Quote
mopar1rules Posted May 22, 2012 Report Posted May 22, 2012 (edited) that's what always happens with them cheapo taiwan rods. i would talk to kevin. when i bought my crank from him, he told me he would replace whatever got damaged from the crank breaking, as he was that confident in the crank he sold me. i would call kevin. he seems like a pretty straight shooter. its my beleif that the taiwan rods can't take the extra mass of the 68mm pistons and at higher rpm the rod stretches too much for the taiwan steel and snap. Edited May 22, 2012 by mopar1rules Quote
zach45 Posted May 22, 2012 Report Posted May 22, 2012 (edited) All to save a few $. "Should of got a wiseco" I would be furious. How many hours on the motor? Sent from my iPhone using Tapatalk Edited May 22, 2012 by zach45 Quote
stroking Posted May 22, 2012 Report Posted May 22, 2012 (edited) i had 5 of those cranks with 29 l/r on the rod either break or bent in a two month period NONE of them had more than 5passes on them all came from the same place Edited May 22, 2012 by stroking Quote
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