44mm stroker cranks for 139qmb

[mmsscooters]

For the scrappy dog +4 crank you need 1.3mm spacing under the cylinder to avoid the piston hitting the valves. I have found that 4 of their base gaskets are perfect spacing. Im still trying to find the perfect jet size for the +4 and the 50mm bbk. With the crank and the 47mm an 88 jet works great. Depending on altitude