I got bitten by the bug again and am goingto pull the Sturdi-Built Mauler i started 20yrs ago off the shelf and get working on it again. My question is regarding the engine, I originally was going to use a Fox .36 RC i had, but now have a Fox .45 Quickee 500 motor available. I have not run it except for 1 quick 5 min run a few years ago to make sure it even ran.

I have read that the large bore Fox carb on these Quickee motors did not throttle that well,more of an On/Off since they were designed to run all out for pylon racing and then idle / off for landing. I can make an adapter for a different carb- but what would you guys suggest?

The throat on the Fox is .340, I have an OS 4A carb with a .280, a ST at .355 and a few others. I am a newbie at 3-line flying so I want dependable more than max top end. Open to all suggetions.

By the way- is the Fox "Stock"  long tuned muffler from the Quickee 500 motor legal in carrier?

Thanks Dave- maybe we can meet up some day over on the Gulf side- my mom lives in Clearwater- and i really should visit more often. I know there are some guys flying C/L over that way- just don't know where. I'm sure by the time i get the Mauler done I will have been able to make contact.

The Fox .45 Q500 motor is basically the same as the current .40-.45 Scneurle engine. I think the timing may have been modified a bit for high RPM, and it came with a factory muffler that consisted of the front of a stock muffler with an aluminum tube rear section that was made to a length to act somewhat like a tuned pipe. looks like what you would do if you were making a "Mousse can" muffler to quiet down a regular R/C motor.

I 'll second the vote on the OS 4 BK. I use it on my Irvine .36 for profile and its very easy to tune on suction. Way better than the Irvine carb was for sure. It does allow for an increase in performance on my Irvines.
Wayne