Way back in 1990, I built my first RC boat, a dumas hot shot sprint 7.5cc/11cc wood kit. I went with the 11cc K&B completely stock. To make a long story short, the boat was difficult to drive and blew over half a dozen times so it got put on a shelf in the garage untill about 6 months ago. The motor had only ran about a quart of fuel through it but turned over hard when i dug it back out. I ended up tearing the motor down and rebuilding it with ceramic bearings, raised exhaust ports, raised compression, 707 header, silver bullit pipe, and Nitro water sports prop shaft kit.. I am running the old style carb with velocity stack. The motor now seems to run great and is very responsive. The motor was mounted with the stock K&B mount before and now is hung on a "High-Jack" mount with about 2 1/4" of set-back from the transom with prop shaft even with sponson bottom. I have a few final questions before I get it back in the water. 1- What is a good starting point for the pipe length ? 2- I have 3 nice props that I have picked up on flea-bay -- Ballanced and polished Octura X455 brass, Ballanced and polished Prather 240 SS, and a ballanced and polished Prather 255 SS . Which would be the best prop to try ? The 255 barely clears the cavitation plate but the aftermarket prop shaft bushings are wiggle free so should be ok. Help ! I'm dying to get it wet again after all these years. Also what kind of speeds will it see ? What % nitro will be best ? Thanks, Byron
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