Tohatsu M50D2 strange idling problem

[binarymizar]

Hi all. I`ve recently bought a s/h Terhi Big Fun fitted with a M50D2, 2006 model. Obviously I don`t know it`s history, but looks to be well cared for and in very good condition. My issue is this;
The engine starts, ticks over and runs fine. However, after its been given a run out on the water, various speeds, i reduce to idle and after a few seconds the motor dies. So I start it (having to use the starting throttle as it won`t start in idle) and it runs, but as soon as I put it in gear it dies again. This can happen 2 or 3 times and then it`ll start and be fine again, UNTIL the next time I reduce to idle after a run (usually just when you DON`T want it to die, like lining up for trailer retrieval!)
Any ideas? Just as a note, the tickover DOES seem to be very slow.

 

[Sea Rider]

Welcome to Iboats.

Do you have an installed tack to check idle rpm ? Probably has to low rpm setting. As a starter adjust main idle screw CW to pull revs up till OB doesn't die when gearing forward, re adjust till than cond is achieved.

Happy Boating

 

[binarymizar]

Cheers for that Sea Rider. Yes it has a tacho. I do suspect the idle is too slow and I think the first thing I`ll try is adjusting the overall idle rpm, the one that has an adjustable stop coming off the throttle control.

 

[Sea Rider]

Yep that's right. Sometimes with use and OB vibration idle screw unscrews itself, usually apply a tiny glue drop on lower screw to lock it once idle rpm is adjusted right. Idle rpm for that 50D2 is 900 rpm.

Happy Boating

 

[pvanv]

The idle stop screw is on the carburetor, not at the throttle control.

 

[binarymizar]

Cheers for that Paul. Yes, I gathered the idle stop was on the carb, together with a lock nut.