This page is about carbs, types, settings and data.
We will try to give you a hand on setting up and finetune the carbs on your bike, in a simplefied way !
To see an extensive article about carbs: surch for Ernie Franke PDF’s on the internet.
Also, if you have more info or if something’s not right, let us know plz.!
First of all a list of most used carbs.
- K37
- K301/K302
- Deni PZ28
- Dellorto 28
- K63
- K68
From this list are DENI PZ28 or Chinese PZ28, Russian K301/302 and K68 the most used.
The Dellorto’s are less used mainly because of the price 🙂
Mixture screw, turn in is richer and turn out is leaner !
PZ 28 basic setup
Mixture screw 1/2 turn ccw out, first turn in cw gently till it’s closed, don’t overtight !
Jet 110, Chinese is usually smaller, replace !
Needle on 2e lowest hole on slide
K301/302 basic setup
Mixture screw 1 1/2 out
Needle 70mm under slide
Main Jet : are numbered by volume that goes through and not by diam. hole.
150 is approx 0.83 mm diameter
185 is approx 1.04 mm diameter
200 is approx 1.11 mm diameter
210 is approx 1.14 mm diameter
Take care…. they look the same but there’s a left and a right carb !
K68 basic setup
Mixture screw 1 1/2 out
Needle
Main Jet
Dellorto PHBH28
Setting Dellorto
Idle jet 42
Main jet 112
Airscrew
needle 3e from above
Rubber manifolds for Dellorto are very expensive so I asked my mate Rob to make a adapter in order to use much cheaper “Ali” rubbers ! He tought it was a good idea, because he has some Dellorto’s too. I did the measurements and he translated that into a cad drawing and made a few pair on the CNC bank.
Chinese Keihin 30, I will try to get this one working on a M72
