Zenith Main Jet wanted

[bison]

Ladies and Gents,
After a bit of faffing around I have found the main jet on my Zenith 28IF is a 94, according to Mr Haynes it should be a 90, this would go some way to explaining why the exhaust is sooty black and the fuel consumption isn't what my previous R4's were.
Does anyone have a 90 main jet?, or any leads as to where I might obtain one?.
Thanks,
Alan.

 

[Charliemouse]

Jetting

You could use the old fashioned technique of: solder it up and use a .9mm drill bit from the model shop...

 

[bison]

Might just end up doing that very thing, take it to .80 then put a .90 through, assuming of course .90 refers to the actual orifice size... I would rather try for a replacement jet.
Alan.

 

[Charliemouse]

Thats certainly the standard nomenclature used by Weber and Delorto - the first number is the size in 10th of a mm. Usual range I work with is 130 - 200 (1.3mm - 2mm) - and then there will be FOUR of them. No wonder they are good on gas!