Yamaha VMAX 150 Idle Issues

[Atlanta Boater]

All,<br /><br />Have a 2 year old VMAX 150. Current problem: after running boat through out the day on the lake, it will not keep a steady idle and will shut off. Seems to happen after a long lake run of about 20 minutes or so, shut boat off, let it sit, then start, boat will no longer idle without shutting off.<br /><br />This has happened last two weekends; however, this past week, the dealer pulled the carbs and took some varnish off, still had problem yesterday.<br /><br />Did leave almost a 3/4 tank of gas in boat from last October or so, dealer had put fuel stabilizer in though, have been filing fresh gas on top of that.<br /><br />Dealer now wants to drain gas tank, thinks gas from last year causing problem. Wouldn't putting new gas on top of that mix it up?<br /><br />Engine runs strong when first launching with full tank, seems like middle of day problem occurs. Would a "hot" engine affect idle?<br /><br />thx

 

[Ray Neudecker]

Re: Yamaha VMAX 150 Idle Issues

The dealer is on the right path. Condensation in the tank can contribute to the problem. It certainly sounds like a fuel restiction problem. They can be difficult to troubleshoot. Running a small seperate tank with fresh gas will help to determine the direction to go now in curing the problem.