With an 800 and 1.25 track I would def stick with 144. You got some pretty good power there and plus the longer studs with that track will have more leverage against the track making it more prone to pullouts than a shorter lug.
I bought Accord racing studs off ebay cause they were cheap. But you cant go wrong with a set of woodys gold diggers. I went with tall nuts and all double backers in a 4-2-4-2 pattern. I didnt use a template though, I spaced them out by eye figuring that would probably give me the most scratch lines. Im very happy with my results.
Hope this helps.
Good luck
1998 XC 700
SLP pipe, boost bottle, power packs, VForce, clutched, Ripsaw 1.25, M-10 susp, 2 in riser, handlebar hooks, third testicle, and good brakes.
"I have not failed, I've just found 10,000 ways that won't work." - Thomas Alva Edison
Amsoil dealer
http://www.galushascottages.com