Yet another jetting question

[peak-j]

I got my T5's, V Force 3's, cool head with 20cc domes, +4 timing advance. I pulled the plugs after a little riding time and they are a little black. They aren't wet but the ceramic is totally black, should I leave it or should I tinker a little bit? 280 mains, 4th clip, stock pilots, and 1-1/4 turns out on the screw. It runs great but just wondering if I would gain anything out of it going a little leaner than it is. I also don't want to be changing fouled plugs all the time either. Thanks for any input.

[mpbanshee]

In order to get a good plug reading, you need to do a "plug chop", or a "hot kill" test. If you just ride around for a while, shut it off, and pull the plugs, you are not getting an accurate reading. Warm the bike up, take off and run through the gears up to 4th or 5th, hold it wide open for about 5 seconds, then immediately hit the kill switch, pull the clutch, and coast to a stop. Now pull the plugs and check the color. This will tell you if your main jet is rich or lean. Or, alot of people like the plug chop method. You can do a search and look into that as well. You should be pretty close. 280 may be slightly big for stock filter/airbox setup.

[peak-j]

I had the plug chop pics the other day, you replied. I also have no airbox lid K&N and pro flow adapter. Thanks

[black sunshine]

I had the plug chop pics the other day, you replied. I also have no airbox lid K&N and pro flow adapter. Thanks

 

They will do that when you are putting around. The important thing that you did was the plug chop. Those same plugs will look totally different after a hard beating.

[peak-j]

Actually I ran the hell out of it, pretty much the whole time. :biggrin: