Question about 2002 Yamaha V Star Custom

1 Answer

I have a 2002 yamaha v star custom 650. It already had jardine pipes on it. I just put on a spike cone air filter. Now it will idle fine, rev fine. When you put a load on the motor, not even half throttle wants to kill the motor. Runs better with the choke on. I think I have a jetting issue, but not sure where to start to fix this problem. Any help would be great.

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  • Yamaha Master
  • 43,785 Answers

Hi, Yzfupo1 tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry. Here is how and where you compensate trouble:
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues. For more information about your issue please click on the websites below. Good luck and have nice a day.
http://rinasvstar.blogspot.com/2012/10/carburetor-re-jet-and-sync.html
star 650 carb sync
http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
OEM parts for Yamaha
https://dd5394a0b8ca8e97ba29-abf76f3d91a2125517d6c7c409f095c7.ssl.cf1.rackcdn.com/content/common/manuals/1999/LIT-11626-12-30_126.pdf

Posted on Jun 16, 2016

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6 Suggested Answers

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Posted on Jan 02, 2017

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cape cod bob
  • 292 Answers

SOURCE: 1999 Yamaha Vstar 650 Custom ...makes clicking noise when trned

i use a jump box on mine most weekends when i wanna take it out, i hook the red to battery and black onto my exhaust and it fires right up no problem. is the clicking noise coming from the fuel pump behind the ignition? it should click for a few seconds then stop. if it stays on then you are not getting enough fuel outta the tank, change the fuel filter and if bike had been stored for winter get a good fuel system cleaner, additive type. if in USA get Berrymans B12, double dose get bike to run hopefully let it stand overnight and all should be fine. fingers crossed. if is is clicking from somewhere else like starter or a relay by the battery, check all the ground terminals you can find
http://www.carlsalter.com/aaman/Yamaha_VSTAR_650_MAIN_MAN.pdf
thats a link for a free pdf service manual
5bead5b.jpg my 99 v star

Posted on Apr 04, 2009

  • 12 Answers

SOURCE: Yamaha 06' V-star 650 idle prolbem!

Fuel filter is located near the fuel shutoff valve within three inches. It is inline between the shutoff valve and the fuel pump (towards tank).

The fuel circuit is: Tank/Fuel Pump/Fuel Filter/Fuel Shut-off Valve/Carbs.

You first step is to check for fuel delivery to the filter. Make sure the bike is cool and no iginition sources are nearby. Disconnect the inlet line at the filter and turn key on and crank engine (to trigger fuel pump.) Do not try and start at this time (choke off).

If fuel is adequate to the filter, check the filter by blowing through it, it should easily pass air. Replace filter if questionable.

Next reconnect the fuel lines and remove float bowl drain plugs in the back of the carbs (2 per carb). If with key on and cranking fuel pours out of these ports then you probably have clogged fuel jets. If not then the float bowl needles / pipes could be plugged with varnish from dried fuel. You can try spraying carb cleaner into the fuel inlet to clear the varnish and then retest. Careful not to spray carb cleaner on yourself (wrap straw with a rag).

If you have good fuel flow to the carbs and bowls you probably have varnish plugging the jets. You should remove the carbs and clean them thoroughly.

Hope this helps,

Kal

Posted on May 18, 2009

rockitman187
  • 2559 Answers

SOURCE: Yamaha v star 650 runs with choke on only

That is the problem,You need to clean the carb jets and get the gum out of the bowl.

Posted on May 22, 2009

Moto-Wiz
  • 34 Answers

SOURCE: where is oil filter located on 650 v-star yamaha

The oil filter is on the right side
under a cover with 3 screws in it.
Remove the covers and replace the filter
and the o-ring on the cover.
Watch which way it goes in
when removing it.

Posted on Aug 21, 2009

FitzOriginal
  • 842 Answers

SOURCE: Yamaha 1100 Drag Star 2001 Custom motor starter,

These parts are fairly reliable. Rather than buying new, you should be able to pick one up from a motorcycle breaker who will post it to you. I would expect to pay about £60-£100 tops in the UK (Depending on mileage). ANy Yamaha dealer will be happy to order you one new, but they are a hell of a price!

Posted on Oct 09, 2009

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