Yamaha Virago 535 2003 dies splutters, backfires, loss of power when riding in the rain. If left a while it will sometimes re-start even though still in the rain

SOURCE: misfire & spluttering when warm

Hi wayne

Not knowing what you have checked or done already, I would first remove the spark plug from the bike and check it fir a carbon deposits. If it has not had a new one for a while, Just get a new one and replace it. Before I drop the oil for a service(as it can dirty up the oil), I also like to run a fuel system cleaner additrive(I use a Nulon product) to my bikes every few thousand kays, just to keep everything tip top. If you still have misfire problems, then it will most likely be a faulty sparkplug cap, ignition lead or other ignition part. Change out/clean spark plug with a wire brush first. I think that will fix it for you. If you still have problems,happy to talk to you more about it.

regards
robotek

SOURCE: Misfire

Hi ..... Do you have access to a multi meter ? Place across the battery, when bike is running and you should display 13.2 - 14volts. Sounds like a dying battery (dead cell ?), lack of charging or elctrics shorting to earth .............. go for the first two first.
Good Luck.

SOURCE: 2001 yamaha R6 will die out on me while riding

Hi there!

dont give up on it yet. the CDI costs much! This sounds like a wiring problem. I've had the same problem before but i checked and traced the wiring and found out that the positive lead wire is making contact with the chassis.. due to vibration and just, it must have eaten the insulator. Check on this part. Also, make sure that your carb jets and spark plugs are clean.

-hope this gives you an idea.
-levibit

SOURCE: spluttering/backfires on low throttle opening/struggles to build

yes clean carbs, use Berrymans B12 fuel additive in the gas, double dose run til hot, then put it away overnight. try next day. also change fuel filter if it's been standing all winter long.

you can try spray in carb cleaner too, remove aircleaner, raise slider in carb with finger or something and spray a bunch in there, let it sit overnight to get to work and try next day

also if fuel is old then get fresh

SOURCE: I have a 1985 xv700 virago. one of my plugs are

follow the plug wire back to the coil and see if there are any breaks, if not might switch coil with the other one and see if the other plug now misfires, if so replace the coil, most cdi problems are not intermittent, typically they either work, or they dont.