Mikey,


As Kevin wrote, as to your first question, you shouldn't worry about a small fuel leak, since this is not an engine with a 'closed loop' lubrication system. The system is a 'total loss' type, where oil is consumed with the fuel.

The only problem you might encounter is am unsightly 'runny nose' and maybe difficulty shutting the engine down by closing the throttle fully.

About your second question, getting more power out of this engine; there are several tuned exhaust systems that will fit.
Jett offers the Jett-Stream and Turbo-Jett tuned mufflers, Nelson offers their UltraThrust and the MVVS has the #3248, which will fit with a suitable header and costs less.

You can also make a 'mousse can' magic muffler, which if you make your own header, will cost you very little.