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Jan 23rd, 2013
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Motor hesitation / loss of high end speed (FIXED!!!) #13319035 10/22/19 02:54 PM
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EastTexasBassin Online Content OP
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For about a month, I've had some bad hesitation and even stalling out when putting the throttle down to get on plane. Motor starts fine and idles fine. Then last weekend I couldn't even get on plane. I did a seafoam shock treatment and that helped a lot but she still jumps and hesitates. When trying to get on plane, it jumps forward for a split second at a time but then rpms drop and she struggles. Once on plane, it will reach max rpms for a second or two but then the speed drops back to only 35mph.

Its a '99 Yamaha 115 2-stroke. I suspect since the seafoam helped that its a carb problem. Should I just go ahead and get them rebuilt? Could these symptoms mean a clogged fuel filter? The gas line and bulb were replaced at the beginning of the year. Any thoughts or suggestions?

Last edited by EastTexasBassin; 10/24/19 12:09 AM.
Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319057 10/22/19 03:23 PM
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steve@hydrodynamics Offline
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what kind of fuel line did you replace with??

i use the blue line, no liner in it for ethanol to deteriate.


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Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319064 10/22/19 03:32 PM
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[Linked Image]

Its the Marine Raider brand, got it at Academy. Could that be the problem?
(I did get the yamaha version, not the mercury one pictured)

Last edited by EastTexasBassin; 10/22/19 03:32 PM.
Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319118 10/22/19 03:59 PM
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bronco71 Online Content
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I would replace the fuel filter before doing anything else, ethanol tends to cause condensation which can clog a filter.


1999 Triton TX21/225 Mercury Optimax
Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319128 10/22/19 04:05 PM
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i'd take it apart and check to see if it has a liner. supposedly the new gray line has a blue stripe on it that is supposed to be ethanol rated.. i still
don't trust it.. i use either the high dollar blue line, or atleast get the black fuel injection line from an auto parts store with a new blue primer bulb, and
make your own setup.


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Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319507 10/22/19 11:03 PM
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Ok didn't see this before but it looks like one of my spark plug wires exploded. Maybe the power loss was from running a cylinder short?

[Linked Image]

Last edited by EastTexasBassin; 10/22/19 11:04 PM.
Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319670 10/23/19 02:12 AM
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bronco71 Online Content
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that ain't helping


1999 Triton TX21/225 Mercury Optimax
Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319702 10/23/19 02:50 AM
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How in the world does that happen?

Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319794 10/23/19 10:21 AM
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I read about a couple cases of this and it seems that if the connection comes loose it can cause arcing and melt the plastic.

Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319893 10/23/19 12:50 PM
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yeah.. thats not a good thing.


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Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13320097 10/23/19 03:51 PM
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Beak47 Online Content
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Marpac fuel line and bulb as Steve said-JWMarine on EBay. And new plugs.


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Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13320182 10/23/19 05:14 PM
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Beak47 Online Content
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Thats the blue stuff. 5/16 can be hard to find if thats what goes to your Yammy. I bought a 10 foot roll from JWMarine and a 5/16 bulb.


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Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13320272 10/23/19 06:42 PM
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The new lines are ethanol RESISTANT, not PROOF. Be prepared to change them out, depending on usage and storage.

Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13320525 10/24/19 12:11 AM
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It's fixed! I replaced the plugs and that messed up terminal and boot. Took her out this evening and she ran like brand new! Even gained 3mph on her top speed, from cleaning the carbs I would guess.

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