wr 400 performance

S

shaggy829

~SPONSOR~

May 28, 2001

130

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• Oct 11, 2001

• #1

HEY RICH
just got a 99 wr 400 it is all stock. I am wanting to uncork this baby . I know about the cam timing ,throttle stop, airbox lid
and the pipe insert. but i am unclear about the removal about of the so called actopus on the carb. also some base line jetting after
all the mods are done ??.


P S i am at sea level

thanks for your help

 

Rich Rohrich

Moderator / BioHazard

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Jul 27, 1999

22,841

16,905

Chicago

• Oct 11, 2001

• #2

Clark Mason was kind enough to detail the entire procedure and post it at Thumpertalk . Here's the link

 

V

vetwfo'er

Member

Dec 18, 2000

124

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• Oct 13, 2001

• #3

Go ahead and buy the suggested jets PAJ (100) and SJ (65) for the de-oct outlined by Clark at TT. Remember there are no performance advantages to de-octing. Only the peace of mind for NO potential air leaks.

Then try this for a baseline with throttle stop cut, YZ timed, uncorked pipe and no air box lid:

172-175 MJ
48-50PJ
EKP #4
1.5 turns on fuel screw

and get ready to ride a whole new bike.

vetwfo'er

 

Last edited: Oct 14, 2001

Tree Crippler

Member

Jun 8, 2000

136

0

• Oct 14, 2001

• #4

Vetwfoer

Ever try the ELN needle? I have it in now and was wondering how it compared to the EKP. Don't forget you need a 100PAJ with that 48 or 50 PJ. The stock 75PAJ is good for the 42 or 45PJ. After changing from the DVP needle I dropped the MJ from 178 to a 172. I won't go back to the DVP or DRS after using an E series needle.

 

S

shaggy829

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May 28, 2001

130

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• Oct 14, 2001

• Thread starter
• #5

thanks guys
i am going to order all the sugested brass and get started can't wait to se how she will run:)

 

Ol'89r

LIFETIME SPONSOR

Jan 27, 2000

6,958

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• Oct 14, 2001

• #6

Shaggy.
There is one more mod you can do to your WR. Under the gas tank there is a connector with one black wire and one grey wire. Disconnect the grey wire and you would not believe the difference in mid range power.

You might want to try it before you change your cam timing.
Doesn't hurt the engine and you still have the rev-limiter.

 

V

vetwfo'er

Member

Dec 18, 2000

124

0

• Oct 14, 2001

• #7

TC,

I only used the jetting configuration (listed above) suggested on TT, developed by JD, Taffy and Clark. It was an old and trusted configuration. So I felt comfortable making changes to my (at the time) current jetting. It was a nightmare just getting to that point and I was not ready to make any changes. But since I was switching to YZ timing, I figured what the heck.

I made both the jetting and timing change at the same time. Between a Friday and Saturday ride. I ended up flatting a couple miles out at Tower but, I was all smiles and have not foulded a plug or had the bike run so good...... ever. Hope you can make it this June;)

vetwfo'er

 

Tree Crippler

Member

Jun 8, 2000

136

0

• Oct 15, 2001

• #8

I should be out this June. This summer I had to fill in for people that were sick or on vacation at work. I still have WR timing. The enduros in NY and some in PA are pretty tight and I don't know if YZ timing would be good.

 

SFO

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Feb 16, 2001

2,001

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• Oct 15, 2001

• #9

The yz timing with the stock wr pipe gave me a softer bottom end, it was nicer in the trees...
But after the pipe and 444cc kit, I have yet to ride in real dirt but look forward to doing something but going sideways.