trouble with ngk plugs?

[oleolson]

Is anybody else having trouble with NGK plugs?  My fl350 ody's are both having plug problems with the BR9ES. They will run fine for a little while and then cause the engine to flubber like it's way to rich.  You can take them out put in a new one and it might last all day.  Sometimes they just quit firing all of a sudden.  The weird part is that you can stick that same plug back in after it cools off and it will run fine for awhile again..  If there's a better plug out there for these fl350's I'd sure like to know about it.  I've always thought that NGK was the best but sure would like to here what you guys think.

[LiveWire]

If you have a stock carb, try dropping the 52 slow jet down to a 45.

[oleolson]

Thanks I'll try it.  I have dropped it down to a 50 instead of 52.  I was wondering if this is part of the reason people go to a water cooled head?

[LiveWire]

A water cooled head should be run with a BR8ES as opposed to the 9. If the issue is just from loading up at idle, a water cooled head would not affect it.

[oleolson]

Unrelated problem or not?  I have put a 38 mm Mikuni and added the extra air
intake but have not done anything with the exhaust. I haven't had a chance to
try the smaller idle jet yet.  I think I'm jetted right with my main jet. But the last
time I rode this thing my exhaust spring broke that holds the muffler to the main pipe.  When I revved it would push the muffler away from the pipe.  To my surprise it didn't make it run too lean and it ran like a striped ape.  Could my restricted exhaust be causing plug problems?  I'm hoping to get a bonus at work
next week  (not from the taxpayers) and if I do I will be contacting  aftershock about an exhaust.

[LiveWire]

The slow jet suggestion was based on a Keihin carb. I have no experience with Mikuni carbs on the Odyssey.

The stock exhaust has a spark arrestor that is supposed to be periodically cleaned out. There is a plate on the bottom near the outlet that you remove and run the machine to clean out.