Thanks for that tid bit.
I wonder what cam , displacement, and CR for the 11 sec 1/4 bike?
I am going to use all my commando dunstall equipment on a 71. The origin, all of which was from a different 71. The big valve head origin year is not certain. My dunstall cam, PD04ZC, was pitifully mild and not the 75hp R2 B540 WFC which is very much like the 2S combat.
Hi Dave,
Missed seeing you at the local brit meets lately! Probably canceled due to Cobid.
I think I remember from the Dunstall catalog it was 10:1 in the 810 kit,
I bought all my parts from Boston Cycle, Right after the 750 Hondas were the rage.
I kept adding Dunstall parts on my 71 ,750 Commando to keep up with 1000 / 1100 Kawasaki's.
1 had a relative who toured Europe on a later Dunstall bike direct from Paul.
He hated it, brought it home, and bought a 850 Duck.
His Norton had the big valve head, I swapped it out for my head because his exh. threads were bad . So he could sell it and buy the duc.
I really noticed a big difference with that head after fixing it. also I got the Dunstall twin front brake with it!
Great bike ,had to sell it to make a mortgage payment in the late 80's. ( may be still in southern Mass. )
So, I've done the build a fast Norton thing, But this time around I decided to see what the Drouin superchager could be made to.
Like 15 psi boost on a semi stock 850! Yea!
It very quick and still a work in progress.
Bruce