Here's the basic layout of the Mikuni 40PHH and 44PHH carb:
http://www.gordon-glasgow.org/Images/Mikuni_layout.jpg
What you are seeing is the 55 Pilot Jet and the 250 Main Air Jet. The Pilot
controls the first 20% of throttle opening. The Main Jet controls most of
the midrange operation, and the Main Air Jet fine-tunes the top end. Here
are a couple of pages I scanned from the Mikuni manual. Someone had these
out on the Web already but I can't find them right now.
http://www.gordon-glasgow.org/Images/Mikuni_tuning_1.jpg
http://www.gordon-glasgow.org/Images/Mikuni_tuning_2.jpg
A 55 Pilot is about right for a stock U20. The 250 Main Air seems a bit
large. I'm running a 190 Main Air and a 135 Main in mine (and I'm at sea
level here in Seattle). You'll need to pull the jet block to see what your
Main Jet is.
Gordon Glasgow
Renton, WA
www.gordon-glasgow.org
> -----Original Message-----
> From: owner-datsun-roadsters@autox.team.net
> [mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Daniel Neuman
> Sent: Wednesday, June 25, 2003 12:06 PM
> To: datsun-roadsters@autox.team.net
> Subject: Solex jet ident.
>
>
> Hello All,
> So last night for my own edifacation I unscrewed the jet cover
> on my old style solexs (with the two screws). I saw four jets
> two pairs. On one it said 55 and the other I swear said 250?
> Was I reading that right? I looked at the manuals and they are not
> very helpful in this respect. How many different jets do I have
> and whats the reccomended jets for a car at sea level?
> Do people put in high alt jets when they go to
> Shasta?
> Thanks,
> Daniel 69 2000
> Oakland CA
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