Mini-Stroke/Stroke mods

diopwrd · Post by **diopwrd** » Sat Oct 04, 2008 11:22 pm

sorry im a newbie...But can anyone explain to me what it is and how it works....all i know is that it has to do with your crank.... thanks alot everybody!

DorkoElite303 · Post by **DorkoElite303** » Sun Oct 05, 2008 12:21 am

YOur putting a whole new crank into your engine block. It's called a stroker because the distance from TDC to BDC is longer then what a stock engine would be.

The mini stroker usually (not always) don't require the inside of the enigne block to be shaved. All full stroker cranks require the inside of the engine to be shaved.

Does that help?

diopwrd · Post by **diopwrd** » Sun Oct 05, 2008 1:18 am

so what else do i need if i wanna mini-stroke my moped?? do i need to upgrade my bore,carb,pipe??

Kenny_McCormic · Post by **Kenny_McCormic** » Sun Oct 05, 2008 2:12 am

This isnt something you should jump into if you just learned what it is, many motors become paperweights this way.

veedubh20 · Post by **veedubh20** » Sun Oct 05, 2008 5:13 am

big stroker kit can crack the block anytime:roll: better off stay on 72cc much more reliable riding..

if you like to very fast, Just buy a yamaha jog 92-01 and spend over 2G will smoke dio big stroker any time... This advanced tuner only! Not for noob....

jstone · Post by **jstone** » Sun Oct 05, 2008 12:51 pm

veedubh20 wrote:big stroker kit can crack the block anytime:roll: better off stay on 72cc much more reliable riding..

if you like to very fast, Just buy a yamaha jog 92-01 and spend over 2G will smoke dio big stroker any time... This advanced tuner only! Not for noob....

I think i need an advanced translator for your posts.

DorkoElite303 · Post by **DorkoElite303** » Sun Oct 05, 2008 3:22 pm

jstone wrote:
veedubh20 wrote:big stroker kit can crack the block anytime:roll: better off stay on 72cc much more reliable riding..

if you like to very fast, Just buy a yamaha jog 92-01 and spend over 2G will smoke dio big stroker any time... This advanced tuner only! Not for noob....
I think i need an advanced translator for your posts.

LOL...pidgin 101?

Anywho, mini-stroker and the full stroker you have to do full block modification. YOu can't just run stock parts either. YOu need at least 7.5-1 gearing over 30mm carb(maybe 28mm) new larger intake manifold, new exhaust(depending on how big your cc) and every little small part you can think about.

When I say block modification, that means cutting and measuring the right amount of material taken out. Like Kenny and Veedub said....you can crack and blow and kill motors if you have any errors in building a stroker.

YOu heard this already, but I recommend you go with corsa 72cc big bore kit, a nice exhaust with intake, carb, pully gears and all the smaller tunning things.

Why?

1) Proven to be the most reliable set-up.
2) Faster then any larger Taiwan cc big bore kit.
3) WOT all day long with out seize or blowing motor. (that's if you tune it correctly)
4) Alot cheaper build then what your thinking about.
5)Alot easier for someone that has never built a scooter motor.

Dac · Post by **Dac** » Sun Oct 05, 2008 3:39 pm

im endorsing DorkoElite303 comment.

burnt_toast · Post by **burnt_toast** » Sun Oct 05, 2008 4:10 pm

Dac wrote:im endorsing DorkoElite303 comment.

I second that, he's listed some very good points.

veedubh20 · Post by **veedubh20** » Mon Oct 06, 2008 10:40 pm

your are right! Cheer!

Arnadanoob · Post by **Arnadanoob** » Fri Oct 10, 2008 5:27 am

A stroker motor is all about an engine where the connecting rod between the piston and crankshaft having more leverage to turn the crankshaft. Try to imagine what it'd be like turning a ratchet to loosen a stubborn/seized nut or bolt with a very short handle. That is like how it is with a normal motor. A stroker would be like trying to turn that stubborn nut with a ratchet with a much longer handle for better leverage and effective torque.

The image on the left is an example of a stock engine with a stock stroke. The image on the right is an example of a stroker engine. If you watch the image carefully, the con rod on the stroker motor gets really close to smacking the bottom of the bore. On a moped block, you'd have to have someone shave/grind some of the metal off to create enough clearance to allow for a stroker crankshaft.

The beauty of the stroker is that you don't need to have all that super high rpms in order to develop the power you need to accelerate since the motor will have an easier time against a load. The engine with the normal crank will need higher rpms to achieve power.

If you want reliability for a daily rider, stick with a normal crankshaft with a big bore setup.