Hi there, i purchased a 1985brownband merc last week that hadn't been run for 6 years but in pretty mint condition so replaced impeller coz that was knackered and had the gearbox oil replaced. I took it for test run today and it pumps water fine, but is very slow on water, way slower than my mariner 5hp. It seems to rev up very high in nuetral but in gear the revs dont go that high?
I also tried it with one ht lead off and it went the same speed and then i tried it with the other one off and the other one re-connected and it still goes the same speed as with both connected. i also tried manually operating the throttle on the carb just incase the cable wasnt adjusted properly but that was ok.
still trying to figure out what is wrong with the engine, i've just been reading about spun props. i didnt realise this could happen, i assumed the prop was directly bolted onto a splined shaft? could this be a possibility? the engine does push my boat at a steady and constant speed, just very slowly.
I also tried it with one ht lead off and it went the same speed and then i tried it with the other one off and the other one re-connected and it still goes the same speed as with both connected. i also tried manually operating the throttle on the carb just incase the cable wasnt adjusted properly but that was ok.
still trying to figure out what is wrong with the engine, i've just been reading about spun props. i didnt realise this could happen, i assumed the prop was directly bolted onto a splined shaft? could this be a possibility? the engine does push my boat at a steady and constant speed, just very slowly.