Hello all, New member here with a 900 that I just bought last week. A 1983 USA model with 11,000 miles in fair condition, running but not well. I put 12 miles on her and noticed the 5&6 pipes turning gold, not blue yet. Pull carbs and proceed to check and clean them. I get to carb #3 and WOW! it is not a VHBZ22 like the others, but a VHB22 with a different slide and needle!
Looks like I am F*cked. I Hardly know where to start. I would guess that finding a VHBZ22D carb is going to be difficult at best. Do you have any ideas or suggestions for me?
All carbs you have on your bike are the wrong size they are for the 504/654 bikes (Ie too small) the correct carbs for your bike are
needle jet 262AE
needle E3 set on 2nd notch
Main Jet 102
Pilot Jet 45
Starter Jet 50
Float weight 14 Grams
Now all you need is new or used carbs!
Yes, I've heard of some sixes coming with 22mm VHBs. There's a chap over here with a bank of 22s. The body is the same size as the 24mm carb and can probably be bored out. Alternatively NOS 26mm carbs from the Ducati parallel twin are available on Ebay Italy at a very good price. You'd have to jet these yourself though. They need one hole drilling and tapping to fit the back plate. Otherwise I think the V50 MK2 Guzzi uses 24s.
After examining the carbs, it appears that the bodies are the same but for this: The VHBZ has a straight-thru bore 0f 22mm.
The VHB has a bore that is 22mm from the opening to just past the slide, where it opens out to a bore of 27mm at the head side.
The slides have different numbers but they appear to be the same cutaway. Thejets and atomiser are the same but the needles are different:
The two VHBZs have E 3 needles.
The VHB has an E 35 needle which is quite different.
So, it appears that if I get an E 3 needle, the only difference will be the difference in the bore at the back side of the carb.
I am starting to feel a little better. Now to find an E 3 needle!