Crank

rickyrcf · Post by **rickyrcf** » March 5th, 2009, 1:55 pm

What is the story on the tin on the crank? Does it need to be there? What
is its purpose? what are the effects of removing it? My crank should arrive at Surf & Turf tomorrow, So I have options.

Thanks, Rick

MICK · Post by **MICK** » March 5th, 2009, 2:17 pm

I think it was a kind of crank stuffer? I don't have it anymore and I couldn't tell you one way or the other it might have effected anything. If you sent it to STR I would have told you to take it off yourself and save $100 that they're gonna charge to do it for you...too late.

high velocity · Post by **high velocity** » March 5th, 2009, 8:57 pm

I removed the crank casing on my 125 conversion.It also has a cr250 ign on it.It seems to rev up really fast. Will let you know how it runs when i ride it, just waiting on the pipe to show up. It seems to rev so fast that the front forks compress!

rickyrcf · Post by **rickyrcf** » March 6th, 2009, 11:10 am

I just talked to Steve at STR, he said definately leave it on.

MICK · Post by **MICK** » March 6th, 2009, 12:37 pm

That makes alot of sense

They took mine off and that was the last I ever seen of it...Did you ask him for what purpose?

Like I said, I couldn't tell a difference with or without.

mega491 · Post by **mega491** » March 6th, 2009, 9:07 pm

My guess is it addresses windage and volume issues.

rickyrcf · Post by **rickyrcf** » March 7th, 2009, 5:16 am

Wheelie-Gene · Post by **Wheelie-Gene** » March 7th, 2009, 8:22 pm

The tins seal the voids.
Remove the tins and you end up w/more crankcase volume.
Less volume = a stronger exhaust pulse.
The minimal savings in rotational mass doesn't outweigh the possibly of hurting performance.

nmdesertrider · Post by **nmdesertrider** » March 8th, 2009, 3:53 pm

you won't notice a difference

high velocity · Post by **high velocity** » March 16th, 2009, 8:41 pm

I finally got to ride/race my new bike this weekend.The motor runs verry well with the crank tins removed. I got a massive holeshot.Some of the guys in my row came over to our pits after the race just to find out what the hell i was riding!

BannedCR500Riders.com

Crank

Crank