The timing chain should still work since both engines use the same chain, cylinder, head ect. The main difference is the back half of case and crank used. The ASW/ new HH engine uses the internal reverse, the older HH engines using the scooter GY6 had an external reverse except for the GT200 which used a bolt on internal reverse. The new HH?ASW cases are also deeper on the CVT side which is where the crank change comes in. The only differences in the new style and old style cranks is (new compared to old) smaller bearing on left side however the shaft diameter is the same so bearings can be swapped, the beveled boss used on old style cranks for the kickstart gear has been cut back 1/2" removing taper. Due to cutting taper back the variator will set 1/2" further back then old style GY6 and requires a longer spline on tip of crank. So I see no way to combine an old style with new style case. Also even if this could be done chances are 99% that the rear sprockets would not line up then there is always the problem of rear mount lining up. Since you got the buggy for nothing the $350 for correct transmission parts is not bad at all for you will have a 2000.00 buggy (new) that only cost you 350.00. Still a hell of a deal. Last but not least the new style engines have a much better gearing in the transmission for as compared to an older stock GY6 with top speed 32mph, these will just about reach 40mph. So with the exception of not being able to use the stroked crank's out there, the engine is a better engine out of the box. Even if you have to re ring the engine you will come out much cheaper to just order the parts and fix the current engine.
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