CRANKS

PurpleMonsta808 · Post by **PurpleMonsta808** » Tue Dec 27, 2011 1:41 am

i have a stock sym dd50 crank running a 72 contessa fully ported thinking off going mini stroke

would it help me with speed?
would it be better?
and what brand mini stroke crank is the best?

:peace:

maddog · Post by **maddog** » Tue Dec 27, 2011 2:04 am

the sym engine just plain sucks

eliteguy50 · Post by **eliteguy50** » Tue Dec 27, 2011 2:08 am

Yes. Better speed and acceleration. How much are you looking to gain.

Wait- are you talking about a new build with ministroker or using the contesss with a ministroke?

PurpleMonsta808 · Post by **PurpleMonsta808** » Tue Dec 27, 2011 2:10 am

as much as i can? y would it help tho with a mini stroke on it

eliteguy50 · Post by **eliteguy50** » Tue Dec 27, 2011 2:48 am

PurpleMonsta808 wrote:as much as i can? y would it help tho with a mini stroke on it

ank combos with bores and pipes.
Better to go with a proper bore then. More pressure. There are more knowledgeable guys that will chime in later with brands and the optimal no clearance cutting crank-bore combos.

sum-azn-kid · Post by **sum-azn-kid** » Wed Dec 28, 2011 1:25 am

sym stock crank is fine. you can still smoke mini strokes if you tune it right. mini stroke you are going to have to add base gaskets. the polini bores were designed for stock crank i think they are best with them. or if you have the $$$ mhr full circle stock stroke. btw what gear ratio are you running? and pipe?

tru72 · Post by **tru72** » Wed Dec 28, 2011 1:44 am

AZn knows the power of a ported polini hehe

PurpleMonsta808 · Post by **PurpleMonsta808** » Wed Dec 28, 2011 3:20 am

im running 7.1 gears and a pg long pipe

veedubh20 · Post by **veedubh20** » Wed Dec 28, 2011 2:08 pm

Ran Dio pg long on a jog

kitaco 7:1

Bear45-70 · Post by **Bear45-70** » Wed Dec 28, 2011 2:48 pm

PurpleMonsta808 wrote:as much as i can? y would it help tho with a mini stroke on it

In hi=performance "There is no replacement for displacement!" This especially applies to small scooter motors.

Trafficjamz · Post by **Trafficjamz** » Wed Dec 28, 2011 7:54 pm

Bear45-70 wrote:
PurpleMonsta808 wrote:as much as i can? y would it help tho with a mini stroke on it
In hi=performance "There is no replacement for displacement!" This especially applies to small scooter motors.

The polini bore is made with the stock crank in mind.

I am not sure if the extra displacement would be off set by the incorrect port timing of the Ministroke

eg: It may not rev as high with the longer crank.

sum-azn-kid · Post by **sum-azn-kid** » Thu Dec 29, 2011 12:17 pm

have you tried the scorp. pipe? and is this motor on a sym? they are heavy i think about 180 pounds.
i wish i kept that ported 72 corsa motor would been fun on my elite e. about 70 pounds lighter then the sym thats why i got it.

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