Not a 750 but when I built my 850 for the Featherbed frame I had Ivan Tighe in Brisbane (a well known cam builder) built up my stock cam and regrind to the 2S cam profile, the extra lift did fit the case just without any grinding of the cases, I machined my original followers flat on a surface grinder and my head was shaved because it was warped a bit and I am running 40thu flat Hepilite Pistons but the final bore to piston clearance was done a bit tighter than recommended and the first 100 miles was done on a very cold night in winter, I am running my original valves but new springs and guides, ports where cleaned and opened up and my crank balanced for the Featherbed frame, this was done in 1980 and I am still running the same set up to this day.
The 2S cam works pretty good on a street bike and I can putter around in 4th gear at 40 mph around the suburbs without any problem any slower I need to downshift to 3rd but open the throttle up and as soon as it hit 4000 rpm it just take off and the cam will run freely well past 7000rpms if you let it, it has great mid range torque and up, my original 850 motor use to valve bounce at 6500rpms and lose power, the 2S cam works so well on my bike and made a big improvement to my motor performance, the motor runs so freely you have to be careful to how high you rev it to and it will rev way past 7000rpm, but would you want too as the mid range works so good.
Running a Joe Hunt maggie and well tuned Amals jetted for my motor its the best it has ever run, my old Norton surprises a lot of modern bikes riders and man does it pull a great wheelie and has no problem powering lifting the front wheel off the ground without trying.
I run the stock 19 tooth sprocket up front, and it will cruise on the open road quite happy all day between 70 to 90mph, in fact it loves it.
So I been running this set up in my 850 for 42 years now and I still have a big smile on my dial every time I take it out, it was an everyday rider till 2013 when I brought my new Thruxton, so the Norton is semi retired (like its owner) but still going as good as the day I first built it, its my hotrod toy now.
I built this motor back in the early 80s when still young and money was tight and while building it I got a job at a TEC College (TAFE) where the head was shaved on a milling machine with a made cutter, the lifters were ground on a surface grinder (and I still have the jig we made to do 2 at a time) the cam was sent to Ivan Tighe and he put me onto a gentleman who did the crank balanced and the barrels sent out for the rebore and final hone done at the College and the ports and guide where done at the college under supervise from an old teacher who rode British bikes and the other teacher was a mechanic for a Norton race team back in the days where he lived in NZ, everything else was done by myself, converting my 850 Commando to the featherbed frame using as much as my Commando parts as I could.
So just throwing in a 2S cam without any other work won't do much unless you open everything else to make the motor breath a bit better and of course the pipes need to be opened up.
My motor was built using my workshop manual that had in the last chapter the high performance section and was built to stage one for road use, stage two was for the race track.
At the time its was all about the 750 Commando motors, but I did it to my 850 using its guide and has worked well for my motor and has been very reliable to last this long.
Ashley
