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Motorcycle Forum / General / Yamaha / August 2007VMax Engine stalls when idling
I have a 2006 VMax with about 1900 miles. Recently, I've noticed a problem where the engine stalls when idling. At best this is inconvenient when not in traffic and at worst, downright dangerous when in traffic. Has anyone seen or heard of this and if so, what's the fix? Thanks for any help. >I have a 2006 VMax with about 1900 miles. Recently, I've noticed a problem >where the engine stalls when idling. At best this is inconvenient when not [quoted text clipped - 3 lines] > >Thanks for any help. set the idle a bit faster. i believe that bike should be around 800rpm? Wouldn't a 2006 'max with 1.9K miles, still be covered under the factory warranty campaign? >I have a 2006 VMax with about 1900 miles. Recently, I've noticed a problem > where the engine stalls when idling. At best this is inconvenient when not [quoted text clipped - 3 lines] > > Thanks for any help. >Has anyone seen or heard of this and if so, what's the fix? Hehe. It sounds like you think that engine stalling is somehow unique to V- Maxes and you expect a recall on that model to fix a design problem. All constant vacuum (diaphragm type) carburetors have very small idle jets, idle ports and idle passages. If you don't ride the bike at least once a week, the gasoline in the carburetors will start evaporating and the evaporated gasoline leaves gum and varnish behind to plug up the idle ports and passages and the engine will stall when it's warm. The alcohol additives in gasoline will keep the carbs clean if you ride regularly, but if you store the bike over the winter, you should use a gasoline stabilizer or when you take the bike out of storage in the spring, you should add 4 or 5 ounces of Berryman B12 Chemtool Choke and Carburetor Cleaner to a full tank of gas and go for a ride. Be ready to adjust the idle speed control knob. It's a knurled knob near the front carburetor on the left side. http://houseofmotorcycles.bikebandit.com/parts/Yamaha/VMX12V+V-MAX/2006/2128811 Also, the pilot adjusting screws are set at the factory, and the EPA requires that the idle mixture be set very lean. There is only one idle outlet port for each pilot screw, and if the carburetors get just a little bit gummed up, the idle outlet port will plug up. That's why I recommend running the B12 through the gas tank. You can get B12 in the liquid form or in an aerosol can for about $3.25. >>Has anyone seen or heard of this and if so, what's the fix? idle screw adjustment and carb balancing on that motorcycle is critical > Hehe. It sounds like you think that engine stalling is somehow unique to > V- [quoted text clipped - 9 lines] > varnish behind to plug up the idle ports and passages and the engine will > stall when it's warm. gasoline takes at least 6 months to start going off >gasoline takes at least 6 months to start going off Not where I live. The high temperature in my garage will be 100 degrees every day from Memorial Day until the end of September and my carbs will plug up in about three weeks. >>gasoline takes at least 6 months to start going off > [quoted text clipped - 3 lines] > in > about three weeks. Stop buying gasoline made from recycled peanut butter >>>gasoline takes at least 6 months to start going off >> [quoted text clipped - 5 lines] >> >Stop buying gasoline made from recycled peanut butter most gas sold in the u.s. is sh.t. in ca. there is so much water in the alcohol they add that it will turn to sh.t in 1-2 months. if you don't use stabile, you clean carbs. i found some gas from the 60's in an abandoned tank. it was still ok. smelled funky and was dark, but it's been running a tractor and a mower for months. modern gas is sh.t. > >Has anyone seen or heard of this and if so, what's the fix? > [quoted text clipped - 8 lines] > varnish behind to plug up the idle ports and passages and the engine will > stall when it's warm. Nah, they all do that ... my '90 'Max gets ridden most days in the summer, regularly in the Cold English Winter, short hops to the shops or work, 500 mile rides to friends in other countries, it never gets hot enough to boil off the volatile fractions in the petrol, and it still stalls if I set the idle too low! Worse is the infamous "VMax hot start problem", so that when it does stall, the battery's not up to cranking it back up... usually in town in front of cute young girls :o( -- Dave H. (The engineer formerly known as Homeless) "Rules are for the obedience of fools, and the guidance of wise men" - Douglas Bader >Worse is the infamous "VMax hot start problem", so that when it does stall, >the battery's not up to cranking it back up... usually in town in front of >cute young girls :o( What kind of "engineer" can't tweak a carburettor and solve an "infamous" problem? "Albrecht wrote... > >Worse is the infamous "VMax hot start problem", so that when it does stall, > >the battery's not up to cranking it back up... usually in town in front of [quoted text clipped - 4 lines] > > -- Well, really I'm an electronics and comms engineer, so the hot-start problem was easy enough (sensibly sized battery cables made up with a hydraulic crimper from t'office plus a fork-lift battery connector under the dummy tank on 25 sq mm cables for jump-starting, charging etc. ), and the idle's set right now :o) PS it's not a "tweak the carburettor", that's all fine, it's a "tweak the linkage, there's an adjustable stop" -- Dave H. (The engineer formerly known as Homeless) "Rules are for the obedience of fools, and the guidance of wise men" - Douglas Bader >Well, really I'm an electronics and comms engineer, so the hot-start problem >was easy enough (sensibly sized battery cables made up with a hydraulic >crimper from t'office plus a fork-lift battery connector under the dummy >tank on 25 sq mm cables for jump-starting, charging etc. ), and the idle's >set right now :o) Yeah, well, most riders don't want to re-engineer their gawddamned starter cables to get their engine to start when it's hot and the mixture is pre- igniting and making the starter's task more difficult. Most owners just want the gawddamned bike to start under all conditions. >PS it's not a "tweak the carburettor", that's all fine, it's a "tweak the >linkage, there's an adjustable stop" Oh, so the linkage is not part of the carburetor bank now. I'll have to remember to be pedantic the next time I need to tweak my carbs. > > the hot-start problem > >was easy enough (sensibly sized battery cables made up with a hydraulic [quoted text clipped - 6 lines] > igniting and making the starter's task more difficult. Most owners just want > the gawddamned bike to start under all conditions. I guess you live in Theory County - everything works perfectly in Theory ;o) > >PS it's not a "tweak the carburettor", that's all fine, it's a "tweak the > >linkage, there's an adjustable stop" > > Oh, so the linkage is not part of the carburetor bank now. I'll have to > remember to be pedantic the next time I need to tweak my carbs. Nope, the carbs' job is mixing air and fuel in a suitable stochiometric ratio, the linkage's job is to coordinate airflow through the carbs - tweaking the carbs will vary the mixture (hopefully in a predictable fashion) with a knock-on effect on engine revs, tweaking the linkage balances and synchronises the carbs and sets the idle speed, simple as that. -- Dave H. (The engineer formerly known as Homeless) "Rules are for the obedience of fools, and the guidance of wise men" - Douglas Bader |
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