RE: Welcome to Club SAITO !
Install a cheap Chinese spark unit and then run no nitro fuel. This nitro stuff is a load of manure. If you need more power, buy a larger engine. You have zero resale value for used nitro, but the larger engine will return you a good bit of its purchase price. But what the hey, I'm talking to T.O.M. who already knows all of this stuff.
Nitro is good when your power is limited by a displacement limit. Additional Displacement is the way to go when there is no displacement limit. Sometimes you can gain additional displacement while losing weight. That's a real Win-Win situation. Buy the larger engine used and in excellent condition and you can pay for the cheap Chinese ignition system. Then it's Win-Win-Win!!! 8>)
Ed Cregger