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Author Topic: '74 WR/CR400 jetting  (Read 2422 times)

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Expat

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'74 WR/CR400 jetting
« on: September 26, 2010, 09:09:54 pm »
Gentlemen,

3 questions.

1) What is correct Bing needle ID for '74 CR/WR400?

2) If a mid '70's 36mm Bing carb body is replaced with an early '80's 36mm Bing carb body (larger diam slide) .......will the early carbs jetting spec work correctly in later carb body??

3) can anyone assist with base line jetting for 36mm Mikuni onto "74 WR/CR400??

Thanks,
J'ean
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Offline HuskyPete

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Re: '74 WR/CR400 jetting
« Reply #1 on: September 28, 2010, 08:26:15 am »
We are running 38 Mikuni's on our 400s, you have to machine the back of the bell of the Mikuni to shorten it and cut a "o" ring groove to seal the carb to the air bell then some silicone around the outside.

38mm Jetting
3.5 Slide
300 Main Jet
50 Pilot
Q2 Needle Jet
6DP1 Jet Needle.

Standard Bing Jetting
170 Main Jet
#1 Slide
45 Pilot Jet
281 Jet Needle
2.85 Needle Jet

Vintage Husky Jetting

160 Main Jet
45 Pilot Jet
Needle Jet 2.85
Jet Needle 281 bottom clip
#1 Slide

The 281 jet needle was standard in all models up to the 75 GP series.







« Last Edit: September 28, 2010, 08:28:20 am by 67Husky »
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1967 360 Viking, 1969 360 Cross, 1974 250 Mag x 3, 1974 400 Cross x 1, 1974 450 WR, 1975 250GP, 1976 250 WR, 1978 390 Auto, 1982.5 500 Gold Bullet. 1976 390 OR, 78 CCM

Expat

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Re: '74 WR/CR400 jetting
« Reply #2 on: October 01, 2010, 07:41:27 pm »
Great information 67Husky.....thanks for that.

Will let you know how it goes.

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mtbrider

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Re: '74 WR/CR400 jetting
« Reply #3 on: October 03, 2010, 10:21:46 pm »
67Husky Do you have the jetting for a 74 CR 125. I am getting rid of the Bing and want to buy a Mikuni.
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