making a 2 stroke "woods ready"

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boogerboy72

Member

Dec 8, 2002

17

0

• Dec 12, 2002

• #1

i have a rm 125, it has a fmf spark arrestor and new sprockets(12-53). is there any thing i can do to make it more for woods and less on mx. the trails i have are really tight and i am bad bout fouling plugs.
thx

 

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MikeS

LIFETIME SPONSOR

Jun 12, 2000

716

1

• Dec 12, 2002

• #2

Jetting..good fuel and oil, possibly next heat range on plug but be careful.

 

Moteaux

Professional Mud Tester

LIFETIME SPONSOR

Aug 30, 2001

1,524

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• Dec 12, 2002

• #3

Possible addition of a flywheel weight as well.

http://www.steahlyoffroad.com/about_steahlyweights.shtml

 

 

Last edited: Dec 12, 2002

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Nevada Sixx

Member

Jan 14, 2000

1,033

0

• Dec 12, 2002

• #4

my best mod was going down to an 11 tooth front sprocket and a reed spacer.

 

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Hondaxrguy

Member

May 17, 2001

573

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• Dec 12, 2002

• #5

The first thing I would add would be some good handguards. In addition to saving your hands, they save your levers too. I ride my KX almost 100% woods, and I've only added my handguards, 2 teeth larger in the rear, and removed some HSC from the forks. It rocks in the woods!

Jeremy

 

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chrishorton

Member

Nov 25, 2002

21

0

• Dec 12, 2002

• #6

I ride a '97 yz125 and I had really bad problems with plugs. I tried a hotter plug and just about all gas ratios for my bike. I found that changing the how many clicks my needle in my carb is set by one making it leaner did the trick for me. I would try this last because a plug or your gas ratio might fix your problem and isn't a major adjustment.

 

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ram1

Member

Dec 12, 2002

33

0

• Dec 12, 2002

• #7

I had a 93 RM 125 and I went with a leaner pilot jet and moved the clip up 1 position on the needle, mixed 40:1 and went with a larger rear sproket, nice woods bike!!!!

 

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ram1

Member

Dec 12, 2002

33

0

• Dec 12, 2002

• #8

I had a 93 RM 125 and I used a smaller pilot jet, moved the clip up 1 on the needle and ran a larger rear sproket. Mixed my gas at 40:1 and had a great woods bike....

 

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boogerboy72

Member

Dec 8, 2002

17

0

• Dec 13, 2002

• Thread starter
• #9

well i think ill adjust the pilot jet cuz i know suzuki is famous for not great jetting. and im gonn get hand gaurd after christmasbut im not buying a new chain just to chang ot an 11 on the front.
thanks for the advice.

 

limitless

subscribed

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Aug 11, 2002

568

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• Dec 13, 2002

• #10

i've heard that changing the front sproket is bad for the chain wear and something else i dont remember maybe jaybird can help out here??
sounds like to me that the smaller front sproket will cause more problems than just buying the new chain & rear sproket

 

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Fark

~SPONSOR~

Aug 12, 2002

438

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• Dec 13, 2002

• #11

A smaller sprocket up front puts more force on the chain, ingreasing wear rate and increasing probably of breaking. You'll chew up front sprocets faster as weel.

Think about it, there are less teeth driving the chain with the same amount of torque driving the sprocket. Imagine pressing a pen with 5 pounds of force on your finger. Probable won't even hurt. Now imagine doing it with a needle, same amount of force.

Typically you'll be fine going 1 down (it's like going up 4 in the back! weeeeeeeeeeeeeeee). Personally I wouldn't go down more than one. I'd just start adding teeth in the back after that.

 

gwcrim

~SPONSOR~

Oct 3, 2002

1,881

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• Dec 14, 2002

• #12

Smaller front sprockets suck power as well. You're making the chain bend in a tighter arc.

 

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boogerboy72

Member

Dec 8, 2002

17

0

• Dec 14, 2002

• Thread starter
• #13

yeha ive heard that to but ill wait and ask the cycle shop owner

 

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boogerboy72

Member

Dec 8, 2002

17

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• Dec 14, 2002

• Thread starter
• #14

but will i have to get a new chain

 

darringer

LIFETIME SPONSOR

Dec 2, 2001

1,029

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• Dec 15, 2002

• #15

I used to trail ride my 99 rm125. 12-53 gearing worked well for me. Sounds like you need to lean out your pilot jet. Stock was around 55 on my 99 and I went all the way down to a 40. It cleaned up the bottom considerably and improved throttle response, making it ALOT easier to ride in tight woods. I never had to worry about seizing because of the low load placed on the engine at off-idle conditions. Plugs always looked good and lasted forever.(Good thing, since I ran the $20 plugs).

 

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boogerboy72

Member

Dec 8, 2002

17

0

• Dec 15, 2002

• Thread starter
• #16

thats great, thats the exact bike i had

 

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Chief

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Damn Yankees

Aug 17, 2001

682

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• Dec 24, 2002

• #17

Going down one tooth in the front is pretty radical. It did help when I was learning, brought the chain in closer to the case and wore on it. The chain does take a lot more abuse than if you go up a few teeth on the rear. The torque of the countershaft is spread out over fewer links at any given time. It also rendered 1st gear all but useless, and that was on a 250. If you want to adjust sprocket size, I recommend going up 2 teeth on the back. Hopefully it will give you just enough change.

Chief

 

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cjreeder

Member

Dec 23, 2002

37

0

• Jan 5, 2003

• #18

Went from 14-48 to 11-52 gearing on my KX420, now I can putt up hills real slow (below the powerband) if there's ample traction.

 

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coleman

Member

Jan 4, 2003

103

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• Jan 5, 2003

• #19

Originally posted by chrishorton
I ride a '97 yz125 and I had really bad problems with plugs. I tried a hotter plug and just about all gas ratios for my bike. I found that changing the how many clicks my needle in my carb is set by one making it leaner did the trick for me. I would try this last because a plug or your gas ratio might fix your problem and isn't a major adjustment.

Click to expand...

I think its just a bit easier to jet your bike properly then to experiment needlessly with gas/oil ratios and different plugs.

 

darringer

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Dec 2, 2001

1,029

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• Jan 5, 2003

• #20

I agree with coleman, take the time and jet properly. It's worth the time invested to make the bike run right, plus you get a good feel for your personal jetting needs making it easier every time you do it. Fooling around with premix ratios doesn't give enough of a change in overall jetting, so it's not worth the trouble.