Hello all,
I spent a while on the phone talking with a couple of guys here in the US that have done basically what Im attempting. What ever happened to the Unison Racing guy?????
Well anyways I spoke to a guy with the same ATV and he also was not happy with the poor stock cylinder. He tried a couple of 47.6 mm cylinders and used a 42 mm stroke crank yielding almost 75 cc.
He has the spacer plates already machined up (about $40.00, quite fair).
His first cylinder was a Metrakit and he had poor low end performance with this and it seemed that the porting was all over the place from cylinder to cylinder (same model).
His second cylinder was a Hebo Manston (flat top piston) and he had great results with this set-up. The pricing for this cylinder seems good at about $400.00 or so US. Is this Hebo Cylinder similar to the Polini EVO I or II in performance and price??
Thanks again for all the help all.
I spent a while on the phone talking with a couple of guys here in the US that have done basically what Im attempting. What ever happened to the Unison Racing guy?????
Well anyways I spoke to a guy with the same ATV and he also was not happy with the poor stock cylinder. He tried a couple of 47.6 mm cylinders and used a 42 mm stroke crank yielding almost 75 cc.
He has the spacer plates already machined up (about $40.00, quite fair).
His first cylinder was a Metrakit and he had poor low end performance with this and it seemed that the porting was all over the place from cylinder to cylinder (same model).
His second cylinder was a Hebo Manston (flat top piston) and he had great results with this set-up. The pricing for this cylinder seems good at about $400.00 or so US. Is this Hebo Cylinder similar to the Polini EVO I or II in performance and price??
Thanks again for all the help all.
damm i just typed a long reply and i was logged off
Well anyways here some of the info you asked for
the 45mm crank i have is out of taiwan and has a outer dia. = 77.8mm Also the taper on the stator side is of the larger jog style. So please check what your new PVL ignition is? If its for a 50cc (39.3mm) crank it wont work. Also you have to take into account that the larger "stoker" cranks out of taiwan are usually ment for the "JOG 90" style trans, meaning the spline is larger with less teeth. So if you are using a stater motor, the Pulley and ramp all have to match your new crank.
You can swith the crank to that of the 50cc style as ( most of italian cranks are) and still use all the same flywheel, ramp and etc.... on that crank. From what i gather you have all the "jog 90" style trans and stator so not sure what direction to recommend you take now? Sorry but it is a confusing set up that you are going for? Let me know if you still want the crank, i got a few left.