What else can be done? is there specifics may be doing wrong synching the carbs?
Greg o day YOU DA MAN you also helped me with my 2001 vstar 1100 i was having same trouble with coils i tested the ohms ,voltage and spark every thing looked good but was still not running on front cylinder until i replaced the coils.
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: four wheeler back fires
If the motor has two carbs then balance the carbs. Balancing the carbs basically means being certain the slides on both carbs open up simultaneously. If one carb opens sooner than the other then it 'drives' the other carb and can cause the backfire. Other things can can cause a backfire but lets start here first.
SOURCE: misfire forward cylinder
First you'll need to get a jet kit from West coast star. Then you'll need to jet the carbs to run equally. This may take some trial and error. Another thing that worked on my bike was the upgraded coil kit they sell. It's almost double the voltage of the stock coils and comes with better insulated wires for a more uniform resistance. I haven't had this problem since. It'll make the cylinders fire evenly and save you from those pestiferous fouled plugs. I hope this helps.
SOURCE: Back firing and doesn't fire on on cylinder until warm
Typical of xv,s itcould be a fuel blockage or damaged diaghram in carb! check all hoses!
SOURCE: 92 virago 750. Front
You have to test all the electronics on the bike to figure out if you have a bad CDI box. A CDI box can test good and still be bad. Your problem sounds more like a bad spark plug cap. Unscrew the cap from the end of the wire and take an OHM reading on the cap. If it is higher or lower than 5000 OHMs replace the cap . A plug cap from NGK runs about $5. Replace them both for about $10 it should take care of the problem.
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