Help !!!

[txironhead]

If you're running the correct plug, check the voltage going to the coils with the key on. I'm betting it's around the 9.5-10V range instead of the full 12V.

[nightfly]

If it runs good with new plugs, but then bogs out after a couple HUNDRED miles, I would have to suggest going to a hotter spark plug. Are you using the BR8ES?

I am using BR8ES plugs, do you know what I would use for a hotter plug ? I think I will go with new coils, and my mechanic says he will check them for sure before we order them. He is two weeks out though to be able to take my bike in, so I would like to try a hotter plug to get by on.

[Nessism]

I am using BR8ES plugs, do you know what I would use for a hotter plug ? I think I will go with new coils, and my mechanic says he will check them for sure before we order them. He is two weeks out though to be able to take my bike in, so I would like to try a hotter plug to get by on.

I don't think you want the BR8ES plugs, just the regular B8ES. Not sure this matters...maybe someone else more knowledgeable will chime in...

[nightfly]

Yes you are right, I am using NGK B8ES plugs.
Sorry, my bad

[MelodicMetalGod]

I agree with bwringer. You really should pull the carbs and take a peek for yourself to ensure that they were cleaned and rebuilt properly and that they aren't showing signs of further precipitants (such as rust from a tank that wasn't serviced completely).

If the coils are truly suspect, test them. Don't know about your bike, but on my bike the coils run in the $100+ range and I wouldn't dream of changing them without fully testing them first. Of course, to test the coils properly, you'll also need to ensure that the electrical components in the chain ahead of the coils are up to par as well (if the battery output is low, you'll never get a full output on the coils).

I'll be very interested to see the solution to this issue.

Best of luck!

[MelodicMetalGod]

One other thing. Unless you've got a modified setup, use the stock plugs with the recommended gap. Can't expect stock results if you don't use stock specs. Get the baseline tight before you make any changes to stock spec parts.