Carb mounting studs

My bike came with the wider inlet spacer. I have purchased the narrower inlet spacer to mount my Carbs as I wish to use the original air filter. Norvil supplied the spacer, but the studs they supplied were 2.2 inches long, same as I already had, they are two long and foul the carb bodies. Anybody know how long the studs should be or even a part number so I can source the correct ones.

Early 750 carb spacers for Monoblocs (Atlas) were 1.5 inches long. When Concentrics were fitted they were shortened to 1.0 inches. The studs for P11 are P/N 21999 and are 5/16 inches diameter and 1.875 inches long with 26 TPI (CEI) thread on one end and 18 TPI thread on the other, both 1/2 inches in length.
Oddly, both spacers are listed in the P11 parts books. Will the air filter fit with 1 inch spacers?

I am not an expert on the P11 but I believe that there should be three studs with washers and nuts holding the carb and one Allen Head Cap Screw bolt that goes on the inboard side of one carb/manifold/heat spacer. I am not sure the thread pitch for the AHCS and the " cylinder head" end of the studs but I am pretty sure the other ends are 26tpi. I will measure the studs and SHCS for length when I get home and report later. You can ask Walridge Motors, Mike probably knows, so send him an email.
Cheers,
Thomas

perilous,
FYI
Studs are 1.960" avg. total length. X3 26tpi on one end and 18tpi on other end.
SHCS: from bottom of head to end of bolt length 1.51" 18 tpi. X1
That's what I have on my P11.
The socket head cap screw bolt is used on the inside of one of the carb pair.
After you tighten the nuts on one carb with the( studs and nuts)combo, you cant get at the inboard bolt except with a SHCS. outboard nut for carb is same as first carb.
Cheers,
Thomas

Thanks you all, I have ordered the parts from AN and once they have arrived will fit. Ron L the original air filter will not fit with the wider 1" spacer, you need the slimmer 1/2" ones.

perilouspierre said:

Thanks you all, I have ordered the parts from AN and once they have arrived will fit. Ron L the original air filter will not fit with the wider 1" spacer, you need the slimmer 1/2" ones.

Click to expand...

That makes sense. On looking further, only the short manifolds (spacers) are listed for the P11 and P11A. I was confused by the listing of "Spacers-thin" and "Spacers-thick" in the parts manual. Actually "Spacers-thin" are the phenolic (Tufnol?) heat insulator and the "Spacers-thick" is the short (1/2 inch) aluminum carb spacer.