one other thought - does anyone here have a frame running a front end w/ a cb750 stem that has neck cups? if so, how long is just the neck, w/o the cups??

Well actually I do....but it's just a big twin/ takes-cups harley style neck (cycleone frame) that I put custom-cut cyclex conversion cups in (ie makes early big twin harley neck take a CB stem).  I don't have it here in front of me but I'm about positive it's just a hair over 5-1/2" (the neck alone I mean).  I've never heard or seen any other kind of setup (other than the cyclex custom cups) with cups & a honda stem.

ps.  I'd bet you're right....I bet your frame has a custom made neck that was made to ironhead dimentions...basically like the cups were included into the design when it was milled out....I think 2" ID is way too big around to take any kind of cups- just need to press the race in there.
Only other thing I can think of is triumph neck....but I'm pretty sure those are longer/ more like honda's.  

pss.  yeah...if you're raking it anyway than just get a nice new neck and be done. 

Last Edited By: Chalfa1980 01/25/10 4:58 PM. Edited 2 times.