Decided I didnt wanna mod the stock engine so picked up an express SR engine. Not down with oil injection and starter so I'm doing a half SR half Hobbit case. Plan is Treats crank, parmakit, dio vforce, vm18, HPI, etc.
Case was pretty crusty so I ported the top port on the SR side to match hobbit and then sent it off for powdercoating.
The stock motocompo engine is the same as a 1 speed Express engine except stamped different and I think has slightly better porting. The Express SR engine bolts on and is 1 in longer. The Urban express engine also bolts on but is 4 inch longer and Im not trying to stretch a motocompo.
Neat that the 8in motocompo wheel fits right onto the SR output shaft. Also minarelli horizontal clutch and pulley drops on. I hear I need to get a Dio bell for it all to work with no shims or spacing