Jetting

W

waynec

Member

Aug 28, 2002

3

0

• Aug 29, 2002

• #1

I have 1992 RM250, It has been ported and has Boyeseen rad valves. I have never been able to get a good burning spark plug, it is always oil fouled. When the bike is in gear and clutch held, it breaks up at 1/2 to 3/4 throttle. When riding it runs well in 1-3rd gear, when I go to 40r 5 gear it bogs down. I currently have stock jetting and ignition timing. I use a NGK B8EGV plug

 

H

helio

Member

Dec 19, 2001

258

0

• Aug 29, 2002

• #2

How many hours with the currently piston ?

 

G

Glitch

~SPONSOR~

Dec 3, 2001

630

0

• Aug 29, 2002

• #3

I would say move the clip on the needle up one spot and get a bigger size main jet.

 

W

waynec

Member

Aug 28, 2002

3

0

• Sep 4, 2002

• Thread starter
• #4

piston and rings are brand new, thanks for your reply

 

R

Rockey5000

Mod Ban

May 6, 2002

293

0

• Sep 4, 2002

• #5

Ya, what glitch said.

 

O

oyster209

Member

Dec 8, 2003

1

0

• Feb 25, 2004

• #6

i have a 93 rm250 and it sounds like what mine experienced. after much frustration it turned out to be the clutch side crank seal. check your gearbox oil, if its low it could be oil is getting sucked thru the bad seal into your cylinder giving you that oily plug.