The 1992 750s have the least desirable engines and ignitions. Their pumps do not work as well as Yamahas in rough water. If it is loud then it has no waterbox.
Make a piston stop around top center, mark both stops on either the flywheel or coupler, split the difference and call it zero degrees. Mark the case/flywheel or coupler 21 degrees early and check it with a timing light. Most aftermarket flywheels have more spark lead than stock. I saw a three...
There is no cheap way out but the limit usually is not in the way until the cylinder is ported with a good pipe and low pitched prop. A 1993-1995 650 ignition #3725 or 3726 will give you a 7000RPM limit with 5 degree retard. 750/800 electrics have even higher rev limits.
A more valid question may be "Why wont banks lend $10,000+ to an 18-25 male who will destroy the collateral in a year or two?" We will be back in business when that gets solved.
It takes about $400 of carbon to get an 8mm thick chamber. What do you think they are selling? A composite pipe must be round with no flat spots in order to work well and save weight. A sheet metal dry pipe is by far the best power adder there is for the weight and price.
Use the stock box until it blows up, it will on the first good after fire. Then get a stock RN box. All aftermarket boxes are annoyingly loud and do nothing for power. A TDR will also eat two holes through your hull when the padding comes loose.
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