ejp
09-01-2004, 06:50 PM
Read what this guy said about how you said to tune the boat. This was on another form where I was trying to help a guy.
I've read a lot of bad advise on this forum but running a boat on the stand, wide open, has to top them all. If you want a basket of broken parts, that's the best way to get them. The mixture needle on a boat ENGINE is set on the water. That doesn't mean you have to run along side it and adjust it. It's a trial and error process. Set it rich on the beach (usually 2 to 2 1/2 turns open - check the engine manual) and launch the boat. The ENGINE has to be under load to set the needle properly. Run the boat and observe the exhaust trail. Heavy smoke means you are to rich. Bring the boat in and lean the mixture. 1/4 turn at a time is usually sufficient until you get close to optimum. Continue that process until there is light visible exhaust smoke and the ENGINE will hold RPM at full power. No loss of RPM in the corners and good response during throttle transition from low to high speed. Also look at the glow plug. If it's visibly wet after a run, chances are the ENGINE is running rich. If the plug coil is distorted after a run, the ENGINE is to lean.
You're local hobby shop should be able to get you in contact with an experienced boater. Seek his/her help, but PLEASE DO NOT TRY TO SET THE MIXTURE NEEDLE WITH THE ENGINE AT FULL THROTTLE OUT OF THE WATER!
I've read a lot of bad advise on this forum but running a boat on the stand, wide open, has to top them all. If you want a basket of broken parts, that's the best way to get them. The mixture needle on a boat ENGINE is set on the water. That doesn't mean you have to run along side it and adjust it. It's a trial and error process. Set it rich on the beach (usually 2 to 2 1/2 turns open - check the engine manual) and launch the boat. The ENGINE has to be under load to set the needle properly. Run the boat and observe the exhaust trail. Heavy smoke means you are to rich. Bring the boat in and lean the mixture. 1/4 turn at a time is usually sufficient until you get close to optimum. Continue that process until there is light visible exhaust smoke and the ENGINE will hold RPM at full power. No loss of RPM in the corners and good response during throttle transition from low to high speed. Also look at the glow plug. If it's visibly wet after a run, chances are the ENGINE is running rich. If the plug coil is distorted after a run, the ENGINE is to lean.
You're local hobby shop should be able to get you in contact with an experienced boater. Seek his/her help, but PLEASE DO NOT TRY TO SET THE MIXTURE NEEDLE WITH THE ENGINE AT FULL THROTTLE OUT OF THE WATER!