Post by carasdad on Jun 16, 2013 15:28:10 GMT -5
Anybody ever try one of these?.. Anything special about it.. i.e. more power than the typical Ebay no name brand ones that many use here.
www.spi-parts.com/scooter-parts-performance/shop-by-engine-type/gy6-50-qmb-139-50cc/airsal-70cc-cylinder-kit-02350150.html
Reason I ask is...I just bought a used 2012 Peace Sports B09 that came with a 50mm BBK from an Ebay vendor that many mention on here. I rode the Scoot when the guy got it brand new...it was a 44mm 'Secret 63' and had more power and speed than this 50mm BBK he installed. In fact this 50mm kit has about as much power and speed as a 39mm 50cc stock Scoot. I tore the engine top end down..inspected and measured everything..all was great and done right....installed new gaskets...but still the same. Doubled the base gasket and used a thicker head gasket because it was pushing 235psi compression and starter could barely turn it. Now it is at 180psi and cranks fine...but still...no power or speed. Revs beyond redline on the stand....but only 5,500-6,000 when ridden...for a top speed after a lonnnnnnnggg run..of about 42 mph. Checked gears...they are stock 11.05:1 Not sure how one BBK could be better than another..as long as they both have proper compression...same bore and the engine runs. Anyway..was just curious if anybody tried the BBK in the link above..and what their thoughts on it are.
Glenn
www.spi-parts.com/scooter-parts-performance/shop-by-engine-type/gy6-50-qmb-139-50cc/airsal-70cc-cylinder-kit-02350150.html
Reason I ask is...I just bought a used 2012 Peace Sports B09 that came with a 50mm BBK from an Ebay vendor that many mention on here. I rode the Scoot when the guy got it brand new...it was a 44mm 'Secret 63' and had more power and speed than this 50mm BBK he installed. In fact this 50mm kit has about as much power and speed as a 39mm 50cc stock Scoot. I tore the engine top end down..inspected and measured everything..all was great and done right....installed new gaskets...but still the same. Doubled the base gasket and used a thicker head gasket because it was pushing 235psi compression and starter could barely turn it. Now it is at 180psi and cranks fine...but still...no power or speed. Revs beyond redline on the stand....but only 5,500-6,000 when ridden...for a top speed after a lonnnnnnnggg run..of about 42 mph. Checked gears...they are stock 11.05:1 Not sure how one BBK could be better than another..as long as they both have proper compression...same bore and the engine runs. Anyway..was just curious if anybody tried the BBK in the link above..and what their thoughts on it are.
Glenn
