Question about Yamaha V-Max Motorcycles

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Vmax vboost not working

Hi, iv got 2 vboost units and 2 servo units none work iv tried testing the vboost units and im getting an earth and a constant live on 1st one and just an earth on 2nd one, both servos have no movement even when a direct live and earth from jump leads, i have to conclude they have burnt out, can you tell me which vboost you think is good? and where to go next please. ps the bike runs fine otherwise. thaks rob.

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  • paddyboots May 11, 2010

    Did you also check the 3rd wire into the Vboost for a good connection to coil 1, it needs to get a pulse from there to know what the engine rpm is? It may not be a faulty Vboost if its not getting a signal

  • Patrick Dennehy May 11, 2010

    Have you compared the resistance readings between the poles of one vboost compared to the other unit's reading between its poles? Just a thought... TT

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5 Suggested Answers

  • 1 Answer

SOURCE: fitted a new exhaust, removed the cable from the

yes the servo has to b in the original position before the cable removal

Posted on Mar 28, 2009

  • 3567 Answers

SOURCE: Starting The Bike On A Cold Morning

Try putting in new, stock spark plugs. Check and possibly replace the air filter. Charge the battery. Get the bike running then check the battery voltage at 2000 rpm. It should show 14volts or more. If not, get the charging system checked. Get a can of starting spray (for future problems).

Get the compression checked. Your bike is 21 years old and I will bet that the valves are needing to be reseated. Check the valve clearances with a cold engine and reset valve clearances as needed. Check the area where the head contacts th cylinder. Any mist of an oil stain? Tighten the head or replace the head gasket. If replacing the gasket, now is the time to have the shop lap re-seat the valves. Have them sync and balance the carbs as well. Your bike will now have its' manners back and show you the dedication it should.

Posted on May 29, 2009

  • 16 Answers

SOURCE: vmax vboost won't cycle when the key is turned on (it tries to)

I had a similiar problem with my Vmax. It was the Vboost computer for mine. It is located under the Left side scoop and is a small black plastic box with a round electrical connector. They are very expensive new. I got my replacement on ebay for around 75.00 dollars. I hope this helps.

Posted on Sep 19, 2009

  • 79 Answers

SOURCE: yamaha vmax 2000 model, full power, runs fine but

Air or fuel. Your not getting enough of one or the other. Start with air by removing your air filter (temporarly) and see if that will tell you anything.

Posted on Oct 02, 2009

  • 66 Answers

SOURCE: i just bought a 2009 ktm 450exc new from dealer

First KTM's are great bikes and are reliable.
Second don't adjust the carb unless you know what your doing.
Third it's a thumper....ie big single cylinder and is also a dirt bike.

So with that being said, if your riding it on the street it's going to overheat and if your riding in tight woods is will overheat as well. The puke hose goes to the frame between the radiators and is a messy location in the event of coolant loss. Most riders make the mistake adjusting thiers carbs when that is usually Not the problem. Unless you've installed an exhaust system or live at high altitude you do not need to adjust anything on the carb Except maybe the IDLE stop screw.

For overheating: KTM has a great add on electric fan kit that will help greatly. Also use Engine Ice or at least Water Wetter for better cooling performance. This costs more but is my favorite....buy some Evans NPG coolant and never boil over again!

Lastly, I'm a huge Husky fan but buying that next is like moving sideways, it's still a 4-stroke. Note... KTM's and Husaberg's (the original husqvarna) are made in the SAME Factory.

Posted on Oct 06, 2009

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Yamaha vmax 2000 model, full power, runs fine but will not accelerate past 95mph even when on vboost. It is not restricted


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Vmax vboost won't cycle when the key is turned on (it tries to)


I had a similiar problem with my Vmax. It was the Vboost computer for mine. It is located under the Left side scoop and is a small black plastic box with a round electrical connector. They are very expensive new. I got my replacement on ebay for around 75.00 dollars. I hope this helps.

Jul 28, 2009 | 2000 Yamaha V-Max

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