Broken crank

[sledwhore]

I'm running a poo doo. Rev chassis with a cfi engine, on the weekend I broke the crank on the connecting rod journal, haven't split the cases yet but can see what's a matter, interested in what to go to. Long rod kit, Welded stock or what the best solution for reliability, I also was running a mtnk fix kit on the top end last season.

 

[tex78]

Cool sled

 

[Bnorth]

"Poo Doo" that sounds like the toilet bowl after a whiskey night lol. I agree nice sled. I would probably just toss a stocker back in, this seems like a unique failure.

 

[Rene G]

Indy Dan LongRod would be cool

 

[tex78]

That won't buff out at all.... Ewwwww

 

[drew562]

There's a kit to put a efi 900 cat in that chassis. Reliable and powerful option

 

[1100]

There's a kit to put a efi 900 cat in that chassis. Reliable and powerful option

Seems like an excessive route to take as a fix. Those things were hard on cranks stock.

 

[Highfly]

Indy Dan LongRod would be cool

X2. Just had my 800 done by Dan. He knows his stuff and hard to beat the 3 year warranty you get!

 

[Nytroman]

Looks more twisted than sheared????

 

[drew562]

Seems like an excessive route to take as a fix. Those things were hard on cranks stock.

900 zr or king car was the best bottom end of its day. Big bore kits would last 5000 miles easy. 1010 or 1150 cc kits. Hard to start but went like hell. They would last longer stock than 5 Polaris 800's. to back and watch the first or 2nd thunderstruck vids. All big bore cats

 

[Jeffpro800]

How much boost are you running? Wondering if it was excessive runout that broke the crank or something else. Hate to rebuild it and have it happen again.

 

[sledwhore]

Definately not case flex. It's on solid plate

 

[sledwhore]

I was running between 8-10 pounds been up to twelve when I was first built it dropped it down a bit to be safer, probably about 800km on this setup last two winters haven't had much time to go out