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Yamaha 90 two stroke stalling
#12820341
07/08/18 04:56 PM
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Joined: Jan 2005
Posts: 17,151
Pat Goff
OP
TFF Guru
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OP
TFF Guru
Joined: Jan 2005
Posts: 17,151 |
Scooter motor. Recently replaced: ECM, three coils, rebuilt carbs, replaced fuel pump, oil pump, New plugs/wires. Starts fine, idles fine, accelerates hard, will run 4,000 rpms all day long, never a problem. Push it a little harder and it'll run fine for a random amount of time, then choke down on two.
Here's where I'm confused where to start: It idles, and won't run right again UNTIL I turn off the key and let it sit for ten seconds, then start it up and it'll usually catch up and run like a champ again, IF I don't run it hard.
Dang ol' motors.....
Pat Goff Seadrift TX
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12820400
07/08/18 06:13 PM
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Joined: Jan 2014
Posts: 198
HoustonCatfisher
Outdoorsman
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Outdoorsman
Joined: Jan 2014
Posts: 198 |
Fuel supply issue. Either bad primer bulb, restrictions in fuel hose or bad pick up in tank. Cannot keep up with demand at high rpm.
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12820402
07/08/18 06:16 PM
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Joined: Jul 2012
Posts: 2,186
boocat
Extreme Angler
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Extreme Angler
Joined: Jul 2012
Posts: 2,186 |
Sure sounds like fuel, but Goff seems like a pretty savy guy. I'm sure you checked all that. is it a built in tank? Nothing in the filter.
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12820515
07/08/18 07:57 PM
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Joined: Aug 2011
Posts: 2,957
Bob Landry
Extreme Angler
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Extreme Angler
Joined: Aug 2011
Posts: 2,957 |
It sounds like Pat has changed everything related to fuel except the fuel hose. If it's old and possibly not ethanol compatible it can be breaking down internally and collapse and you would never see it. Happened to a friend of mine on a three YO Crestliner. I would try to borrow an external fuel tank and connect it directly to the motor and see if the problem goes away. That would at least eliminate bad fuel line and dirty pickup screen.
2015 Seaark 1872 MV CC Etec-90 Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic 2020 Robalo R200 CC, Yamaha 150
Bitter Gun Owner Bitter Clinger Armed Infidel
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12820526
07/08/18 08:11 PM
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Joined: Dec 2013
Posts: 459
PlanoPaul
Angler
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Angler
Joined: Dec 2013
Posts: 459 |
Sure sounds like you have something hindering your fuel supply to one of your carbs. I had an old Merc in-line 6 that did this exact same thing, ended up finding a chunk of hose lodged in the inlet to one of the carbs. Got it out and it ran like a top. Id start at the carbs and go through the fuel system back to the tanks.
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12820609
07/08/18 09:40 PM
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Joined: Jan 2005
Posts: 17,151
Pat Goff
OP
TFF Guru
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OP
TFF Guru
Joined: Jan 2005
Posts: 17,151 |
Fuel system is brand new from tank to motor.
If I thought it was fuel I wouldnt have bothered anyone here.
What has me baffled. Only after I shut it off and let it sit for ten seconds it fires up and takes off like a champ. If I dont shut it off itll never catch and run. I would have guessed a coil was breaking down at rpms but I replaced all three.
Pat Goff Seadrift TX
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12820646
07/08/18 10:11 PM
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Joined: Dec 2011
Posts: 97
Delbert
Outdoorsman
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Outdoorsman
Joined: Dec 2011
Posts: 97 |
I have a lot of respect for your post Pat a little scared to even try a response. But here are two possible scenarios stopped up fuel vent or carb float set to low. Have you pulled any spark plugs to get a reading on how their burning.
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12820676
07/08/18 10:45 PM
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Joined: Jan 2005
Posts: 17,151
Pat Goff
OP
TFF Guru
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OP
TFF Guru
Joined: Jan 2005
Posts: 17,151 |
Yeah Im gonna pull it all apart tonight. Was hoping I got a your hematron wire is loose. Thanks for the advice Ill let everyone know what the culprit is.
Pat Goff Seadrift TX
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12821036
07/09/18 05:57 AM
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Joined: Apr 2015
Posts: 1,818
Curtbass
Extreme Angler
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Extreme Angler
Joined: Apr 2015
Posts: 1,818 |
Pat. Check your Hematron wire connection while you're in there. Could be one of those "new" coils. I know they're new, but... JS. Frustrating as heck when you figure out a new part fails immediately. It happens. Good luck & hope its a simple one once you find it. Damn the gremlins!!!
ELITE POWER SYSTEMS/ Elite Fishing Products Lithium Battery & Charging Systems, Soft Plastics, Tackle,Tokyo Rigs Tight lines & stay safe out there.Gods blessings
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12821487
07/09/18 05:28 PM
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Joined: Jan 2005
Posts: 17,151
Pat Goff
OP
TFF Guru
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OP
TFF Guru
Joined: Jan 2005
Posts: 17,151 |
Well....pooo. I replaced the fuel connector, inside fuel line, put another filter on, it's not fuel. Fuel pump is working fine, all three carbs are vaporizing fuel at WFO just perfect.
Now it's the electrical gremlin. I have another coil, I'll see if I can swap them around and try to make it fail, but we'll see.
Pat Goff Seadrift TX
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12823860
07/11/18 05:20 AM
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Joined: Apr 2015
Posts: 1,818
Curtbass
Extreme Angler
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Extreme Angler
Joined: Apr 2015
Posts: 1,818 |
Hope you're feeling better too. Its prolly a feel bad gremlin that'll only show up when you're sick. Strep gremlin. Damn him!!! Like I said earlier, I HOPE it's a simple one. Get well soon . Both you & your mota!!
ELITE POWER SYSTEMS/ Elite Fishing Products Lithium Battery & Charging Systems, Soft Plastics, Tackle,Tokyo Rigs Tight lines & stay safe out there.Gods blessings
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12823971
07/11/18 12:47 PM
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Joined: Jan 2005
Posts: 17,151
Pat Goff
OP
TFF Guru
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OP
TFF Guru
Joined: Jan 2005
Posts: 17,151 |
Thanks. I've got three more rabbit trails to chase down. I'll let everyone know when I find it.
Pat Goff Seadrift TX
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12827903
07/14/18 12:18 PM
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Joined: Aug 2011
Posts: 2,957
Bob Landry
Extreme Angler
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Extreme Angler
Joined: Aug 2011
Posts: 2,957 |
Pat's been awfully quiet. Wonder what's happening with his motor.
2015 Seaark 1872 MV CC Etec-90 Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic 2020 Robalo R200 CC, Yamaha 150
Bitter Gun Owner Bitter Clinger Armed Infidel
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Re: Yamaha 90 two stroke stalling
[Re: Pat Goff]
#12828009
07/14/18 02:06 PM
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Joined: Jan 2005
Posts: 17,151
Pat Goff
OP
TFF Guru
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OP
TFF Guru
Joined: Jan 2005
Posts: 17,151 |
It's sitting there waiting for me to pay attention to it.
Pat Goff Seadrift TX
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