Question about Yamaha V-Max Motorcycles
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.
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
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
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
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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