Hello.
I have a Yamaha 40 hp which I have problems with the idling. When I start it (usually most when it's cold), it idles pretty rough and at low speed I feel it's not quite right. It coughs a lot.
When it gets up to speed. 8-22 knots it almost never misfire. It's very rare I have problems with it then. It also starts up pretty easily. Sometimes he's a bit greedy with the choke. But I've heard it's normal for the Yamaha engines that they need a bit of choke at cold start.
I've changed the spark plugs.
I've taken out the carburetors and cleaned them and adjusted the float bowl.
Is it maybe a carburetor adjustment problem here? I don't feel it's ignition related as it runs decent in high rpm.
It's also a very old engine. It has run for god knows how many hours. So could this maybe be mechanical? Since it works better when getting up to operating temp?
Thanks for every help I can get.
Best Regards
Benjamin
I have a Yamaha 40 hp which I have problems with the idling. When I start it (usually most when it's cold), it idles pretty rough and at low speed I feel it's not quite right. It coughs a lot.
When it gets up to speed. 8-22 knots it almost never misfire. It's very rare I have problems with it then. It also starts up pretty easily. Sometimes he's a bit greedy with the choke. But I've heard it's normal for the Yamaha engines that they need a bit of choke at cold start.
I've changed the spark plugs.
I've taken out the carburetors and cleaned them and adjusted the float bowl.
Is it maybe a carburetor adjustment problem here? I don't feel it's ignition related as it runs decent in high rpm.
It's also a very old engine. It has run for god knows how many hours. So could this maybe be mechanical? Since it works better when getting up to operating temp?
Thanks for every help I can get.
Best Regards
Benjamin