texasfishingforum.com logo
Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
hardinii, polaco, KenB, John Wydner, CPG8787
113777 Registered Users
Top Posters(All Time)
TexDawg 97,126
hopalong 89,833
Pilothawk 80,202
John175☮ 77,777
JDavis7873 67,400
Bigbob_FTW 67,192
Derek 🐝 64,944
Mark Perry 60,736
Tritonman 58,986
facebook
Forum Statistics
Forums62
Topics780,713
Posts9,906,602
Members113,777
Most Online36,273
Jan 23rd, 2013
Print Thread
Motor hesitation / loss of high end speed (FIXED!!!) #13319035 10/22/19 02:54 PM
Joined: Jul 2009
Posts: 1,263
E
EastTexasBassin Online Content OP
Extreme Angler
OP Online Content
Extreme Angler
E
Joined: Jul 2009
Posts: 1,263
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
Joined: Aug 2006
Posts: 7,055
steve@hydrodynamics Offline
TFF Celebrity
Offline
TFF Celebrity
Joined: Aug 2006
Posts: 7,055
what kind of fuel line did you replace with??

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


www.hydrodynamics-usa.com
info@hydrodynamics-usa.com
903-763-5225




Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319064 10/22/19 03:32 PM
Joined: Jul 2009
Posts: 1,263
E
EastTexasBassin Online Content OP
Extreme Angler
OP Online Content
Extreme Angler
E
Joined: Jul 2009
Posts: 1,263
[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
Joined: Feb 2006
Posts: 2,522
B
bronco71 Online Content
Extreme Angler
Online Content
Extreme Angler
B
Joined: Feb 2006
Posts: 2,522
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
Joined: Aug 2006
Posts: 7,055
steve@hydrodynamics Offline
TFF Celebrity
Offline
TFF Celebrity
Joined: Aug 2006
Posts: 7,055
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.


www.hydrodynamics-usa.com
info@hydrodynamics-usa.com
903-763-5225




Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319507 10/22/19 11:03 PM
Joined: Jul 2009
Posts: 1,263
E
EastTexasBassin Online Content OP
Extreme Angler
OP Online Content
Extreme Angler
E
Joined: Jul 2009
Posts: 1,263
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
Joined: Feb 2006
Posts: 2,522
B
bronco71 Online Content
Extreme Angler
Online Content
Extreme Angler
B
Joined: Feb 2006
Posts: 2,522
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
Joined: Dec 2008
Posts: 8,913
G
grout-scout Offline
TFF Celebrity
Offline
TFF Celebrity
G
Joined: Dec 2008
Posts: 8,913
How in the world does that happen?

Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13319794 10/23/19 10:21 AM
Joined: Jul 2009
Posts: 1,263
E
EastTexasBassin Online Content OP
Extreme Angler
OP Online Content
Extreme Angler
E
Joined: Jul 2009
Posts: 1,263
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
Joined: Aug 2006
Posts: 7,055
steve@hydrodynamics Offline
TFF Celebrity
Offline
TFF Celebrity
Joined: Aug 2006
Posts: 7,055
yeah.. thats not a good thing.


www.hydrodynamics-usa.com
info@hydrodynamics-usa.com
903-763-5225




Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13320097 10/23/19 03:51 PM
Joined: Jan 2017
Posts: 287
Beak47 Offline
Angler
Offline
Angler
Joined: Jan 2017
Posts: 287
Marpac fuel line and bulb as Steve said-JWMarine on EBay. And new plugs.


Hardcore Texan
Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13320182 10/23/19 05:14 PM
Joined: Jan 2017
Posts: 287
Beak47 Offline
Angler
Offline
Angler
Joined: Jan 2017
Posts: 287
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.


Hardcore Texan
Re: Motor hesitation / loss of high end speed [Re: EastTexasBassin] #13320272 10/23/19 06:42 PM
Joined: Nov 2002
Posts: 4,417
Gamblinman Offline
TFF Team Angler
Offline
TFF Team Angler
Joined: Nov 2002
Posts: 4,417
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
Joined: Jul 2009
Posts: 1,263
E
EastTexasBassin Online Content OP
Extreme Angler
OP Online Content
Extreme Angler
E
Joined: Jul 2009
Posts: 1,263
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.

Previous Thread
Index
Next Thread


© 1998-2019 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide
Powered by UBB.threads™ PHP Forum Software 7.7.3