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Tohatsu 3.5 4 strokes low RPM at full throttle
Hi there, I'm new around...I bought last autumn a brand new 2014 Tohatsu MFS3.5b (3.5 hp) which I had many problems with.
I brought it back to the reseller many times, they fixed most of the problems. But the last one it seems we did'nt find it yet.
Let me explain :
(The carb is brand new, changed 3 weeks ago)
When I use it on the water, with a 14" fiber fishing boat, there's no difference in RPM between full or 3/4 throttle. So it work fine at 3/4 throttle. The tachometer I bought give me around 4500-4800RPM. But in the user manual it said should run between 5000-6000 rpm at full throttle.
If I turn a bit more then 3/4 throttle it seems to want to go higher but stall at this rev around 4800 rpm...
I tried a mercury 3.5, a few year older than mine, which is the exact same engine, and difference in full throttle was very noticeable. Almost got my fishing boat on a plane with it.
So if somebody know those engines well, if there's adjustment to do, please let me knpw.
Also, it get it's 6200rpm on neutral without any problem. I have the same 7" pitch propeller which comes with the outboard.
Last edited by Antares555; 09-01-2015 at 08:54 AM.