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Message started by matt on 05/18/09 at 10:24:02

Title: Main Jets Trivia
Post by matt on 05/18/09 at 10:24:02

Just curious if anyone knows comparison to mikuni jets and dyno jets. I have a dyno jet kit, with these 4 main jets:

DJ140
DJ142
DJ144
DJ146

PO had a 144 in there i changed to 146 but i think i will go back down to 144.

Also, The Needle has several clip positions, im wondering will moving the clip down (which would actually be raising the needle up in the carb or shortening the needle) be the same effect of the "White Spacer" mod?

I notice the white spacer is exactly 2 of the 'needle jet - notches' tall i wonder if there is any correlation there..

6A4D434C5056454D4A240 wrote:

*found this on another board. looks to be accurate, I know this has been discussed here in the past*

Mikuni / Dynojet Size Comparison Chart

Mikuni--Dynojet
140-----149.3
150
142.5---152.0
145-----154.7
155
147.5---157.3
150-----160
152.5---162.7
165
155-----165.3
157.5---168.0
170
160-----170.7
162.5---173.3
175
165-----176.0
167.5---178.7
180
170-----181.3
172.5---184.0
185
175-----186.7
177.5---189.3
190
180-----192.0
182.5---194.7
195
185-----197.3
187.5---200
190-----202.7

Title: Re: Main Jets Trivia
Post by srinath on 05/18/09 at 11:08:32

Neelde clip dowm = lifting the needle and it will work like the white spacer mod.
The thing to remember is, needle is an obstruction in the emulsion tube. The thinner it is the effect is like making the main jet larger.
DJ has cut needles to their specs, and it is some times very much thinner than the original. Cant swith from DJ needle to stock needle and run the same main ... or vice versa.
Cool.
Srinath.

Title: Re: Main Jets Trivia
Post by SV og LS on 05/18/09 at 12:19:03

That DJ jet size chart is completely backwards. A given DJ main jet equals numerically larger Keihin, Mikuni or Dellorto main jet.