Keihin, Dynojet & Mikuni Jets Cross-Reference

This was brought up recently.
I had to find it and dust it off... :laugh:

A keeper! ...



Keihin uses a basic number system, doesnt seem to correlate to anything in particular.

Dynojet expresses jet sizes by thier precise measurement in mm. Example: jet# 140 = 1.40mm hole diameter in jet.

Mikuni uses a metering number system that correlates to the amount of cc's of fuel passed in 1 minute. Example: jet# 117.5 = 117.5 cc/minute.

Cheers!

youdaman

that is really cool and timely my students are doing fuel systems this week and i have had a few people ask me the difference between jets . i had info like this years ago but i have't been able to find it thanks for the assistance.

Nice chart

The Mikuni jets are only rated that way for the reverse type jets. Hex jets are not cc rated.

larrycavan wrote:

Nice chart

The Mikuni jets are only rated that way for the reverse type jets. Hex jets are not cc rated.

Yes! Thats correct.



Thanks all.

The tread pitch on the Keihin jets is also a tiny bit different, but close enough for them to thread without stripping anything. The Dynojet thread is the same as Mikuni. I have used Mikuni jets on Keihin carbs many times before using a similar cross reference.