motor limiter?

[mrpike1973]

hi 84 merc 9.8 i have a 14' alum boat about 125# when i'm at full throttle some times it feels like its missing once in a while. a called the dealer they said if i'm wide open it could be to fast so it kills a cylinder so it doesn't over rev. they told me to back off of wot just a little. doesn't do it that much but better. is this correct the boat is rated for 15 hp so i dont think its the boats to heavy thanks i have a 30 warranty and just want to fix any thing bad other wise it runs and starts like a million bucks thank you

[boatfixer]

There is no rev limiter on that engine.

I would 1st want to verify its the ignition that's cutting out.

[mrpike1973]

is that something I can do myself, or should I take it back to the dealer?

[marine_man]

If you have a timing light you can check it yourself.

marine_man

[marine_man]

i have a 30 warranty and just want to fix any thing bad other wise it runs and starts like a million bucks thank you

If you have a warranty I'd start there..

marine_man

[mrpike1973]

thanks marine man. i brought it up there sat. they still say its a limiter i told them it doesnt have one they got quiet fast. so far i'm happy with them but i got my 6 hp evinrude there ran great then it shut it off wouldnt start again so i traded it back to them. after rowing i might add. any advice on how to deal with them. i dont want to be a jerk but i bought it at a marine dealer so i could get a warranty and service they havent jerked me yet but i dont want to be a pushover either thanks marine man very helpfull

[marine_man]

Does it only act like this at full throttle? Does it idle smoothly, take off when you go from idle to full throttle? It sounds like a fuel or spark problem to me...

Perhaps you could offer to take one of their technicians for a ride and repeat what you're doing for him

marine_man

[mrpike1973]

sounds good i'll try to do that. idles smooth only seems to do it at full throttle even when i back down some. waiting for them to call me back thanks again marine man

[mrpike1973]

hi i took it to them they are saying that the motor is bigger than the boat. its rated for 15 hp it has a 9.8 on it. when 2 people are in it it doesn't do it. today on calm water alone i noticed it again they said that what is happening is the boat is very narrow and light if weight is not distributed right the prop can actually cavitate itself i think this makes sense would others agree. the boat weighs 125# and all i have is the fuel tank and an anchor. thanks for the help.

[boatfixer]

Does the motor rev and loose bite?

[mrpike1973]

no, i don't think so. i marked the prop, & checked for spun prop, seems okay. thanks.

[fishingstar]

did you buy it south of darwin?

Dan

[mrpike1973]

no i did not buy it south of darwin. also i'm going to put it on my starcraft 14 boat its a little bigger and heavier to see what it does worse or better thanks

[boatfixer]

no, i don't think so. i marked the prop, & checked for spun prop, seems okay. thanks.

I'm refering to cavitating, does it loose bite?

[mrpike1973]

yes sorry i didnt quite understand what you meant. it doesnt seem to rev high. it feels like when your going fast in a boat in high waves sometimes when the motor comes out of the water slightly like the motor skips a beat but it does it in calm or regular water sorry i'm not really understanding the problem. its like it stops for a split second then resumes running just fine otherwise.

[boatfixer]

Then id say cavitation (ventilation) is not your problem.

When a prop is too close to the surface, it can pull air down into the blades. This obviously reduces the "grip" the prop has on the water, it revs because it slips and often u have to let up on the throttle and slow the boat. Missing, cutting out is not a symptom of ventilation, or cavitation as they are calling it.

[mrpike1973]

thanks boat fixer. that cleared up a lot would you suggest i go some where else. to fix it

[fishingstar]

I live on a lake by Litchfield. If you would like I could help you figure out your problem. just bring it over and we could take it for a ride.

Dan

[mrpike1973]

hi dan sounds like your a mechanic 320-237-8709 call me if you can what do you charge an hour