"I have a 5 hp tohatsu and I a
"I have a 5 hp tohatsu and I am having trouble running at trolling speeds. The engine is new and I have had a mechanic adjust the carb but I just can't go slow enough. My boat is a 14 ft Lowe sea-Nymph (140lbs). I weigh 190 lbs, so even with my gear I'm not pushing much.
When running at low speed, the engine misses and then dies. I don't have a tach but the RPMs sound quite low so like I said I don't think it is the carb but who knows. If I adjust the idle screw so it stops missing it doen't die but then I go too fast.
My thought was to change the propeller from the standard 8 (7.9 X 7.9) to the 7 (7.9 X 7.0). I'm sure the change in pitch from 7.9 to 7 will slow me down, but then I worry about high RPM at max throttle. Like I said I'm not pushing much.
So then I look at the engine specs and it says maximum RPM 5500. Like I said I don't have a tack. I have an old model for a car. Can I use that tach on 4 cyl. and then multiply by 4?
Finally, I know that the only difference between the 5 hp and the 6 hp is carburetion. The 6 hp max RPM is 6000. How would a change in carburation change the max RPM from 5500 to 6000?
I generally don't run the engine at maximum throttle but I understand the safety principle behind not exceeding the max rating. But what gives on the max rating difference between the 5 hp and 6 hp?"
"I have a 5 hp tohatsu and I am having trouble running at trolling speeds. The engine is new and I have had a mechanic adjust the carb but I just can't go slow enough. My boat is a 14 ft Lowe sea-Nymph (140lbs). I weigh 190 lbs, so even with my gear I'm not pushing much.
When running at low speed, the engine misses and then dies. I don't have a tach but the RPMs sound quite low so like I said I don't think it is the carb but who knows. If I adjust the idle screw so it stops missing it doen't die but then I go too fast.
My thought was to change the propeller from the standard 8 (7.9 X 7.9) to the 7 (7.9 X 7.0). I'm sure the change in pitch from 7.9 to 7 will slow me down, but then I worry about high RPM at max throttle. Like I said I'm not pushing much.
So then I look at the engine specs and it says maximum RPM 5500. Like I said I don't have a tack. I have an old model for a car. Can I use that tach on 4 cyl. and then multiply by 4?
Finally, I know that the only difference between the 5 hp and the 6 hp is carburetion. The 6 hp max RPM is 6000. How would a change in carburation change the max RPM from 5500 to 6000?
I generally don't run the engine at maximum throttle but I understand the safety principle behind not exceeding the max rating. But what gives on the max rating difference between the 5 hp and 6 hp?"