Help! 4.3tks bogging issues

t73681

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Joined
Jun 29, 2014
Messages
3
having some trouble with my boat. it's a 2013 larson lsr with a 4.3tks
boat is new to me last season, ran great last season, no issues at all.
this year started it up and ran ok on the muffler. had a slight hesitation at idle, a very mild stumble, chalked it up to last years gas. I replaced the fuel/water separator filter. ran it again on the the muffs. again a mild hesitation/stumble but stayed running and could rev it in neutral no problem.
took it out to the lake started right up again. I could hear the hissing of the tks like usual. let the engine warm up as per usual and when I tried to accelerate it bogged down and would not go. did not stall out but would not accelerate. put it back in neutral and revved it up no problem. back in gear and falls flat on its face. again won't stall out but barely moving. rpms not going above 1200-1500.
after approximately 5 minutes of working the throttle back and forth it just seemed to come alive and then was able to go full speed. slowed back down to an idle and then accelerated again no issue.
parked the boat, thinking all was good, must have just been some bad gas working through the carb? next day, exact same thing happened.
once warmed up seemed to be ok. stopped to swim for about 45 minutes and when I started it the same thing happened again.
also not sure if this is related but at wot my tach is only reading at 2500rpm. not sure if that's just the tach not reading properly? wot is approx 4800rpm. might be the tach itself?
any help appreciated. thanks
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
51,255
Try running the motor from a good tank of fuel

Your fuel may no longer be fuel
 

t73681

Recruit
Joined
Jun 29, 2014
Messages
3
the tank was just about empty and had stabilizer in it. added 60liters of new fuel and a can of seafoam. I think it would be okay but running on portable tank would eliminate it as a possibility. process of elimination...
 

t73681

Recruit
Joined
Jun 29, 2014
Messages
3
the tank was just about empty and had stabilizer in it. added 60liters of new fuel and a can of seafoam. I think it would be okay but running on portable tank would eliminate it as a possibility. process of elimination...
so the fix was new a new distributor cap and rotor. took the cap off to inspect and found corrosion on the contacts. cleaning them up may have been enough but for $50 decided to buy a new cap/rotor kit. Runs A1 now.
 
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