Yeah I have to admit the MVVS isn't quite up to a 170, so keeping the weight down is something of a mission for me, also considering I also have to cart around an extra battery pack and ingnition module it does add up. Having said that the economy of the fuel and how little it uses is brilliant, I can get 2 sequences of the advanced pattern out a 12 oz tank!

THe MVVS is a highly strung engine and does need a lot of love, I've gone through a few con rod bearings already, but I'm willing to do the work to get the power I need out of the engine..

AS for what type of engine could be used, I think any of the 140-160 2 strokes would work effectively with some judicious moving of the firewall to suit.