Running lean?

evilone · Post by **evilone** » Sun Sep 28, 2008 4:52 pm

ok, i'm running premix 32:1...about a 95 main jet (was running a 90 before premix and using stock air box with good plug chop)...cylinder and piston are 1 size over bored...uni foam filter...ported intake and exhaust port. Hitting 45-48 unless against wind. My question is, when doing plug chop why is plug still white? Should I upjet even more? By the way i'm premixing for now since oil pump went bad, I might keep premixing if I can get the "cocoa brown" I want.

Kenny_McCormic · Post by **Kenny_McCormic** » Sun Sep 28, 2008 5:00 pm

Try a 100, and turn your airscrew all the way in(effectively fattens up idle jet).

evilone · Post by **evilone** » Sun Sep 28, 2008 6:05 pm

ok. I have the air screw almost all the way in now (if I go any further it wants to stall).

Kenny_McCormic · Post by **Kenny_McCormic** » Sun Sep 28, 2008 6:31 pm

Up the idle speed.

evilone · Post by **evilone** » Sun Sep 28, 2008 6:32 pm

10-4!

tru72 · Post by **tru72** » Sun Sep 28, 2008 7:57 pm

again... playing with the idle adjustment or playing with the air fuel mixture will not make it richer.. there are a few ways to get it richer. first of course get a bigger jet. second is restricting your air box, in your case with a pod filter, just get a bigger jet. Remeber that checking the plug is only good after a "WOT" wide open throttle run.
Good luck!
aloha
D

evilone · Post by **evilone** » Sun Sep 28, 2008 8:14 pm

I ordered some gauge drills and will up the jet size in a few days. I have a stretch of road about a mile long for tests (light traffic). That should be long enough at WOT right?

tru72 · Post by **tru72** » Mon Sep 29, 2008 12:59 am

jus remeber that once you do a WOT you need to stop and pull the plug. Sometimes ,not in your case , people think they are to rich. its actually because when idling the plug is fowling. The correct thing to look for in something called a fire ring. It usually appears all the way at the bottom for the porcelain. Since im a picky * about my jetting I actually cut open spark plugs for my drag bikes.

hope that helps you!
aloha
D

Dac · Post by **Dac** » Mon Sep 29, 2008 1:20 am

what the * do you use to cut open the plug?

tru72 · Post by **tru72** » Mon Sep 29, 2008 4:31 am

lol a vise and a hacksaw...

kolohe · Post by **kolohe** » Mon Sep 29, 2008 4:57 am

Can also use a die grinder with a cutting wheel.

evilone · Post by **evilone** » Thu Oct 02, 2008 8:27 pm

Well i'm up to a 104 jet and put stock air box on. PLug chop=shiny dark grey "small" spot on one side of porcelain. I don't get it. I know i'm pre-mixing but d***! a 104 jet won't cut it? And I can only hit 40 with slow take off. I used to take off quick and hit 45-48. I'm about to go back to before oil pump went out. Time to put up and get some goodies over winter.

evilone · Post by **evilone** » Thu Oct 02, 2008 8:28 pm

p.s. every time I up-jet The take off is worse and power seems weaker.

Post by **noiseguy** » Fri Oct 03, 2008 9:59 am

Have you tried running the stock intake setup again? Actually, why did you switch away from it?

Pull off the cover if you think you it's choking airflow.

evilone · Post by **evilone** » Fri Oct 03, 2008 6:23 pm

When you say "stock intake setup" do you mean an intake that's not ported? And what cover that's choking airflow are you talking about? I thought restricting air filter box helped richen mixture. If the UNI pod filter has too much oil on it will it cause problems?