1973 50hp engine help please

[solidwaste]

yesterday I took out my boat for the first time mainly to run it and test everything..Ran great on way out and most of the way back but one the way back in I noticed every time I went past 3/4 throtle it felt like the engine was kicking out of gear and it would rev real hi cut back the throtle and it would kick in and run fine any thoughts?

 

[papasage]

Re: 1973 50hp engine help please

is it manul or eletric . post modle #

 

[solidwaste]

Re: 1973 50hp engine help please

electric it is a lark but i dont know model #

 

[Scotty's Fujiboat]

Re: 1973 50hp engine help please

perhaps your prop is in dire need of a fix?<br />I looked in my manual and came up with these model #'s for a 1973 50 HP not sure which ones are electric or which are manual<br />50302 50303 50372 50373

 

[solidwaste]

Re: 1973 50hp engine help please

so you think I should start by puting on a new prop?

 

[Mark42]

Re: 1973 50hp engine help please

Do you hear gurgling sounds when it revs up? That indicates that air is being sucked in the prop allowing it to rev freely in the foam. If you hear that noise, check for changes in the transom, like new hardware added or damaged antiventilation plate on motor. Also things like rope wound up on prop and other garbage hung up on the hull can raise havoc. <br /><br />Basically, when things go wrong, look at the last change you made. If nothing has changed lately, then look for something failing.

 

[solidwaste]

Re: 1973 50hp engine help please

no gurgling sound when it revs up..nothing on motor cant see any damage to anything. After I got past 3/4 throtle it would act like it had no bite on the water and the engine would rev real high like it would if you were in netrual.. As soon as I cut throtle back it would stop reving so high and rode fine.. when it did start to rev high you could feel the boat slow down..Then when I cut throtle it would sound fine and I could feel the boat pick up speed again but it did not jerk or anything.. Oh yea I did noticed when I first was going out when I went full throtle it seemed to pick up speed gradually not all at once like most boats I have been in the longer I was at full throtle the faster it seemed to get until it was at max..I have a 16ft 73 Larson tri hull and the max speed I could get was about 18mph..

 

[blackhawkdc]

Re: 1973 50hp engine help please

Sounds like possibly the rubber sleeve in thr prop is slipping under heavy load (more thatn 3/4 throttle) I'd check that out.<br /><br />Seth