<VV> 62 and 63 YH carb differences?

[Frank DuVal]

Hi Mark,

First, get Bob Helt's YH book. It explains the differences better than I 
can. He also lists a contact for Blackhawk Engineering to buy new 
metering rods.

I know this is just a RTFM reply, but it really is a good book!

BTW, according to Bob, you have an early 1963 YH carb, not a 1962!. So 
it is correct for your car. Later 1963 production used a different body 
0-1580, which has a noticeably different accelerator pump discharge 
needle assembly.

Pay attention to total advance, not just initial setting, which may now 
be different with the boost/retard vacuum unit. Others here who have 
used them should chime in. Like the "other" Frank.

Frank DuVal

On 5/4/2011 8:36 PM, Markpowhatan at aol.com wrote:
> I just noticed that my 63 Spyder has a 62 YH carb on it (body # 0-1507)
> with a 63 compressor housing with PCV.  After having a complete engine
> rebuild, I now have some pinging when in boost, and thats with High octane gas,
> and a new "boost-retard" that is working.  What's the difference between  the
> 62 and 63 YH carb bodies?  I see that when ordering rods and jets,  there
> is some difference.  I am trying to go richer as a last effort to  stop the
> ping, and plan to order another rod and jet to see if that helps.  Any
> suggestions?  Thanks!  Mark Francis   63 Spyder   Powhatan, Va.
>