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Yamaha vmax 150 - fuel problems
#11738235
07/23/16 07:48 PM
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Joined: Jul 2010
Posts: 7,120
Jeezy
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Motor has always run fine. Had a lower unit replaced, and while it was in the shop I had the carbs rebuilt and a hot foot installed. It has run like junk ever since. The symptoms are:
1. Will not idle. Idles extremely rough and slow and then putters out.
2. Has become very tough to start, and when I finally get it started there is a huge smoke cloud, then the smoke goes away. Have to have the throttle hammered down to get it to start and run.
3. After idling onto the trailer bunks, I give it throttle and it bogs down and shuts off. At this point after restarting it every time I mash the throttle to push it on trailer it bogs down and dies. Also, at this point, I can't back it off the trailer without the engine bogging down and dying.
4. It used to run at wot at about 5000 rpm. Now, after I get it on plane, max rpm is about 4400, then slowly fades to between 3800 and 4000. If I make a sweeping turn, it briefly goes back up to 4200 rpm then fades back down to 3800 and 4200.
I'd appreciate any and all thoughts.
Last edited by CoachCBA; 07/23/16 10:05 PM.
“The more you know about Donald Trump, the less likely you are to vote for him. The more you know about his business enterprises, the less successful he looks. The more you know about his political giving, the less Republican he looks.” - Lindsey Graham, 2016
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Re: Yamaha vmax 150 - fuel problems
[Re: Jeezy]
#11739036
07/24/16 12:26 PM
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Joined: May 2003
Posts: 11,586
gary purdy
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Manual fuel pump diaphragms.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Yamaha vmax 150 - fuel problems
[Re: Jeezy]
#11739158
07/24/16 02:14 PM
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Joined: Jul 2010
Posts: 7,120
Jeezy
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do you mean these pumps?
“The more you know about Donald Trump, the less likely you are to vote for him. The more you know about his business enterprises, the less successful he looks. The more you know about his political giving, the less Republican he looks.” - Lindsey Graham, 2016
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Re: Yamaha vmax 150 - fuel problems
[Re: Jeezy]
#11739172
07/24/16 02:25 PM
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Joined: Jul 2010
Posts: 7,120
Jeezy
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Or do you mean the bulb between the tank and the motor?
“The more you know about Donald Trump, the less likely you are to vote for him. The more you know about his business enterprises, the less successful he looks. The more you know about his political giving, the less Republican he looks.” - Lindsey Graham, 2016
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Re: Yamaha vmax 150 - fuel problems
[Re: Jeezy]
#11739631
07/24/16 08:03 PM
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Joined: May 2003
Posts: 11,586
gary purdy
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The arrows point to the manual fuel pumps or low pressure fuel pumps. The diaphragms are a known yamaha problem. They rebuilt the carbs on this motor in the picture?
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Yamaha vmax 150 - fuel problems
[Re: gary purdy]
#11739677
07/24/16 08:43 PM
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Joined: Jul 2010
Posts: 7,120
Jeezy
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The arrows point to the manual fuel pumps or low pressure fuel pumps. The diaphragms are a known yamaha problem. They rebuilt the carbs on this motor in the picture? No, I found this picture online. I'll see if I can change these and see if it helps.
“The more you know about Donald Trump, the less likely you are to vote for him. The more you know about his business enterprises, the less successful he looks. The more you know about his political giving, the less Republican he looks.” - Lindsey Graham, 2016
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Re: Yamaha vmax 150 - fuel problems
[Re: Jeezy]
#11742123
07/26/16 02:06 AM
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Joined: Apr 2004
Posts: 14,067
Stump jumper
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Take it back to the shop that did work. I had carbs on Merc rebuilt once a got some bad needles. Before mechanic replaced them he made me replace all the fuel lines. You could have bad fuel lines flaking on inside. If so you will chase your tail tearing down carbs.
2200 Bay Champ/200 Mercury Optimax 2017 Tundra TSS 4x4 Crewmax 5.7L
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Re: Yamaha vmax 150 - fuel problems
[Re: Jeezy]
#11743626
07/26/16 10:48 PM
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Joined: May 2008
Posts: 358
blackhorse
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Angler
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What year is your engine?
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Re: Yamaha vmax 150 - fuel problems
[Re: blackhorse]
#11743993
07/27/16 02:08 AM
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Joined: Jul 2010
Posts: 7,120
Jeezy
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What year is your engine? 2006.
“The more you know about Donald Trump, the less likely you are to vote for him. The more you know about his business enterprises, the less successful he looks. The more you know about his political giving, the less Republican he looks.” - Lindsey Graham, 2016
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Re: Yamaha vmax 150 - fuel problems
[Re: Jeezy]
#11773959
08/12/16 11:02 PM
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Joined: Jul 2010
Posts: 7,120
Jeezy
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Update: Turns out the shop that did the original work did not change the plugs, which were fouled. Service Marine in Emory changed em, synced the carbs and adjusted the idle and it runs like a top now.
Should have gone to Service Marine the first time.
“The more you know about Donald Trump, the less likely you are to vote for him. The more you know about his business enterprises, the less successful he looks. The more you know about his political giving, the less Republican he looks.” - Lindsey Graham, 2016
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