SOURCE: schematic diagram of a 1981 yamaha 750 virago carburetor
Should get a good view of it by downloding free manual at
carlsalter.com...good Luck to you friend...Tim
SOURCE: recommended fuel octane for 2005 yamaha 1100
Definitly Premium. Do not use any Ethanol blend fuels.
SOURCE: how do i adjust the idle on my 1995 yamaha virago
On most bikes and four wheelers, this is done by a throttle stop. the position of the stop is usually adjusted by a screw. Remove the tank. turn throttle and see what moves by the carb/ injectors. When you return throttle to idle, the moving piece will come to rest on the throttle stop. You can now adjust its position by turning that screw.
SOURCE: yamaha xv 1100 virago
To me it sounds like the coil is breaking down and not working at higher RPM's. You can take them off and have them tested at a service shop.
SOURCE: I HAVE A 87 YAMAHA VIRAGO 1100. HOW CAN I CHECK TO
There should be 3 wires coming from the stator that are the same color,( usually yellow or white) each and any pair of these will produce an AC current, maybe around 40-50 v, engine running. each pair will also have the same resistance and non will have continuity to ground, if you get no AC or there is grounding, likely the stator.
If you get ac going into the regulator, and not better than 13v across the battery when running, need a regulator.
The stator is a possibility , as the oil eventually starts to break down the insulation.
Note: running a near dead battery, or jumping of a car battery can stress the charging system,as it tries to produce more amps than normal opperation
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