RE: Time to buy the Zenoah Engine ?'s
If you are running a stock zenoah run a 644 carb . They are much easier to tune . And the 644 has a choke and primer bulb as the 257 does not . Running a clutch is a nice feature if you want to crank the boat and it not take off . You will need a water pump so the motor does not over heat when at idle in the water . The drawback on a clutch is the motor has to turn the added weight to the crank shaft and the extra weight in the boat . Running with out a clutch will allow all the power from the motor to transfer directly to the prop . And you will have less weight in the boat ! If your boat is just one to run and have fun with use a clutch . If you are looking for all out speed and may race don't run a clutch .