2002 RM85 plug fouling

E

endomatic

~SPONSOR~

Oct 31, 2001

46

0

• Sep 1, 2002

• #1

We bought a 2002 rm 85 last month and it keeps fouling plugs. Any jetting specs. would be great. It is stock and i run MC1 at 40 to 1.

Thanks,
Endomatic

 

C

Chris#67

Member

Aug 31, 2002

5

0

• Sep 2, 2002

• #2

My dad had the same problem. If you have the jetting stock, then you should try a bidder mixing oil. Red line seems to work the best. :thumb:

 

Vic

***** freak.

LIFETIME SPONSOR

May 5, 2000

4,008

0

• Sep 2, 2002

• #3

We run Mobil 1 MX2t at 32:1 . BR9ES plug.
Stock main.
Needle clip in No. 2 position.
#45 pilot.

 

C

chillywillyt

Member

Jun 16, 2002

41

0

• Sep 2, 2002

• #4

I would go to 32-1 on any brand and make sure that the gas you are using is from a good station.....we found ONE station and got ahold of the supplier and made sure they went through a bunch of gas and always had fresh stuff......makes a difference, also make sure that yer spark plug is gapped correctly.....not just out of the box

 

F

flyfishdoc

Member

Apr 29, 2002

126

0

• Sep 2, 2002

• #5

if its stock you need to use 93 octane... changing the jetting to pay 4 dollars more a gallon really isnt worth your while... with our 98 RM80 we ran 32:1 C12... then i started using upwards of 2 tanks a day so we switched to 93 Octane... it actually runs better to a noticeable extent.
Andrew

 

D

dad80

Member

Dec 11, 2001

30

0

• Sep 2, 2002

• #6

we race two 2002 rm 85's run stock jetting in both running vp and super unleaded mixed3 to 2 using maxima 927 at 40-1 and dont have a problem at all with fouling plugs at the track we rode in a parade today and it tried to foul due to the nature of riding slow and not being able to keep it cleaned out good luck on what ever you find out

 

W

waldo76

Member

Jun 7, 2002

8

0

• Sep 3, 2002

• #7

2002 RM80
Yamalube 36:1
93 Octane
122 Main
48 Pilot
Boysen Pro Series Reeds
BR9ES
No Problems...

 

M

MikeS

LIFETIME SPONSOR

Jun 12, 2000

716

1

• Sep 3, 2002

• #8

126 main
Needle #3
45 pilot.

Phillips P45 , 20:1 Xamax oil. Pump gas seemed fine on the same jetting.

122 Main with VP C12

If your rider is just starting out or not keeping it WOT, try a B8es plug. That may help the low speed fouling. If not check float ...??

 

nikki

Moto Junkie

Apr 21, 2000

5,802

1

• Sep 3, 2002

• #9

Originally posted by MikeS
If your rider is just starting out or not keeping it WOT, try a B8es plug. That may help the low speed fouling.

Click to expand...

I agree - won't hurt to try a BR8ES plug and see if that helps. When I rode 80's (as a beginner rider) I needed to drop down to the 8 heat range to prevent fouling. Although more experienced 80 riders mostly run 9 and 10 heat range plugs (but these are the guys that never let off the throttle, too).

If that doesn't help - sounds like you may need to lean out the pilot, main, or clip position. How do the plugs look after just one ride? And how does the bike run through the different throttle settings (0-1/4, 1/4-3/4, 3/4-full, etc...)?

 

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endomatic

~SPONSOR~

Oct 31, 2001

46

0

• Sep 3, 2002

• Thread starter
• #10

Thanks for all the tips.I will start trying some this week.It mainly fouls on start ups and is very wet and black. I think we will try the hotter plug first. Thanks again.

Endomatic

 

M

MikeS

LIFETIME SPONSOR

Jun 12, 2000

716

1

• Sep 3, 2002

• #11

Knock the choke off once it fires. Don't let it run on the choke especially with the stock pilot jet.

Goodluck

 

K

kstarr87

Member

Jul 6, 2002

34

0

• Sep 4, 2002

• #12

I had the same problem when i first got my bike too. It was the jetting. I run
Yamalube at 36:1 and a ngk b8es and it runs fine now

Kevin