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Rd 400 34mm carb upgrade

Started by 2strokesforever, February 13, 2019, 11:15:02 AM

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2strokesforever

A few months before the old site went down there was a thread about jetting an RD 400 with 34mm round slides.

Anybody gave it saved?

I thought I did as I'm putting 34s on my 77 rd 400, but I can't find it in my files.

Just wondering what needle and needle jet was preferred?
1963 YD3
1968 YG5t
1970 Rupp Scrambler
1972 LS2 100
1973 LT2
1975 RD250 x2
1975 RD 125
1975 DT400
1977 RD400 x2
1977 DT/RD
1978 DT400 x2
1980 Exciter 440
1983 CR60
1983 CR80
1991 TZR250R SP
1992 Vmax 750-4

And 1 4 stroke- 2014 Vmax 1700- tuned by Tim Nash

buffalorider

Depends on elevation? Here is what I have in my 34's on my '77 RD. I just posted a question about my carb issues today.
6DH3 needle on 3rd clip down
159 P-8 needle jet
270 main
45 pilot
2.5 slide cut out
1 1/8 out on air screw

I live at near '6900 but will be riding bike from around '4500 to maybe '10000 feet above sea level when hitting mountain passes.
Mom, can I have a dirtbike?....NO!! Guess that is why I didn't even start racing until I was 40.

2strokesforever

Oh, I'm not going after pilot/main jet sizes I know that varies.
Looking for the needle / needle jet used most commonly.
1963 YD3
1968 YG5t
1970 Rupp Scrambler
1972 LS2 100
1973 LT2
1975 RD250 x2
1975 RD 125
1975 DT400
1977 RD400 x2
1977 DT/RD
1978 DT400 x2
1980 Exciter 440
1983 CR60
1983 CR80
1991 TZR250R SP
1992 Vmax 750-4

And 1 4 stroke- 2014 Vmax 1700- tuned by Tim Nash