rejetted with obeln.

[Descendents]

I have been reading posts from this site all winter and decided to try to rejet my 2002 426. This past weekend I put a obeln needle in it on clip 3 and left everything else stock. I also put a p-38 cover on it that a guy from work gave me. I noticed a big difference on how the bike runs, it seems to rev quicker and was a rocket as I ripped through the gears. I didn't feel any missing anywhere and it did not pop.

My question is when I pulled my plug after ridding it twice, it was black. Before I did the rejetting, I would pull the plug and it would be really wet and black, now it really wasn't wet, but just black. I was wondering what part of the carb should I concentate on to lean it up some, pilot, neddle or main. I have never seen my plug look anything else but black since I have owned the bike. I would think that if I could get the plug tan it would be running at its peak. Any help would be greatly appreciated. I ride in Michigan, around 1000ft, this past weekend was around 60 degrees.

[Indy_WR450]

Yamaha fourstrokes will show a black wet plug when idling before chopping. I would call it normal and not worry about trying to clean up the pilot jetting. If the bike is running well off idle I would leave it alone.

[MN_Kevin]

You have to break down your jetting to top end, mid range and bottom end, and test each accordingly.

[Chas_M]

The tip of the obeln needle is much smaller (richer) than most other needles, therefore a smaller main jet may be required.