Worst upgrade.

Bernhard · Jan 7, 2020

ando said:
Bernhard

You previously advised in another thread that you purchased your dunstall cam from a closing down sale. Another member suggested that it was from a reject bin which may well be the case. I know that my cam has the timing on all lobes within a degree or so. I also previously noted Comnoz comments regarding the hardness of Dunstall cams as being excellent, something that I can vouch for from the state of my cam and followers after over 100,000 miles. How many commando cams have gone that long. And my dunstall commando will still run over the ton with a gear to go. My only negative experience was the cylinder pulled the head studs which were helicoiled or bushed early on. It would have done 100,000 miles successfully since then, and I found the fibreglass disappointing but all the rest have been excellent. ando

You have misquoted me. The street cam I ordered tho the post, the shop brought cam was a full race cam which had flats machined on the lobes to create the extra lift, this had "Robinson" written all over it -I didn't use and sold on. I would say that the mechanics who build Dunstalls own bikes might, I say, might have used the good ones and sold to dudes like me the bad ones, or. . . . what you got was pot luck, you either got a good one or you didn't. I once raced at Snetterton a 20 lap production race against various bikes on a Honda 500/4, one bike was a 750 Dunstall Atlas, which I lapped, and I thought those bikes were quick , I overtuck him on the straight and my Honda was flat out at 105! I can guess what was slowing it down. . . .

Bernhard · Jan 7, 2020

As for the hardness on Dunstalls cams, they were probably made at Newman cams - who make a lot of car cams. But they have only being going since 1967 according to their website. One other cam in the reject box had all the lobes so worn out they wouldn't have lifted the valves off their seats. Re f/glass; this was made by Curley f/glass and the quality could vary a lot.