50 hp Mariner 4 Stroke - intermittent problems
Bought another boat at the weekend - unfortunately not a RIB, family duties needed some shelter for the little ones.
I tested the boat before purchasing and the engine ran well.
Upon getting the boat to Salcombe, the engine seemed to run very well, idled nicely after launching and ran perfectly for 40-50 mins of displacment speed cruising in the estuary.
When throttled back to slow speed after 50 mins, the engine coughed and spluttered and then cut out. I managed to start the engine again, and it would take revs out of gear, lifting up the flap on the throttle box, as soon as gear engaged it would go up to idle and then cough and splutter if any more revs added. As quick as this happened it passed, only to splutter a couple of times on the way back to the slip way. Needless to say the wife wasn't impressed!
The fuel tanks were new, with fresh fuel that morning - any suggestions of other things I should look for?