@frazer-c that's good, yeah I plan to really, seems a nice find, but if anyone on here got stuck I'd be happy to sell cheap really, but it's not actively for sale

I've got a near enough brand new one, came on a very low mileage original dry stored unopened engine I bought. Nothing seized and slide doesnt have a scratch or anything, might be for sale at the right price if you have any bother. Happy to clean and re jet if required but I'd feel bad opening it for the first time haha.

Pick up a cap from the Scrappy, any car one with the same pressure will work aslong as it has the old style rad cap. You'll pay Penny's for it.

If you change the head gasket, skim your cylinder head cause it's likely warped.
This can be done easily at home, get a glass chopping board and put some 1000 grit sandpaper on it, rub the head around it in a figure of 8 motion. If the heads really bad I usually use a oil stone first. Repeat while adding water to the wet and dry paper until whole head surface is even and shiny. Torque the head down, run the bike up to temperature, and then torque it down once again.

I think I used to run a 25 pilot and 250 main on my original carburetor with romeu hendriques system and airbox snorkel removed, ran well.

@Calum I'll take a picture of the head I've got, it's stamped 3MB but it's the one with the ridged, I'll have a look at the book cheers
I planned on skimming the deck down at the end to create slightly higher compression than standard ideally

I've got a 2003 restricted 3mb head sitting around so thinking about experimenting on the lathe at home and trying to create an unrestricted, or maybe higher tuned head. Does anyone have some good references for head tuning or any tips? Also if anybody has good pictures of the unrestricted head or even better dimensions of each section that would really help, sadly my unrestricted heads on the bike right now and I won't be able to pull it for a couple months. I know some basics to try avoid detonation, such as a narrower squish section reducing chances etc, but I'm not too clued up about squish heights and compression amounts on the DTR.
Cheers

It's been a while, again
But my DT is finally out of hibernation properly and I've done some little bits, passed her MOT the other week with a couple advisories, but nothing major at all.
Over the winter I've been fitting and experimenting with a new Polini PWK 32mm carburetor, after lots and lots of tuning and jetting I've finally got her right, not perfect, but right for now!
The carburetor made a nice difference I found, revs up clean and seems to have more torque throughout the revs than standard, fit original intake system nice too.
I bought a cheap blowtorch, butane and some heat proof lacquer to blue the welds on my romeu exhaust and clean up some of the rough spots from the grit and grime of the UKs winter roads.
It took a long long time and nearly killed me with the fumes but it's looking good now! And I'm starting to be happy with the build, still after some decals for the bike but struggling to find someone who can do designs how I'd like, but I'll keep the search up.
I also just got an absolute bargain of a DTR engine, I think it's a 2003 but it is completely unsplit, none of the bolts had been touched (until I got to it ) and it came with a fresh original carb and servo. Took the cylinder off to free the rings, piston and bore look brilliant but rings are slightly out of spec at 19 thou so ordered an original set and Athena gaskets to bring it up to spec. This engine will be dropped in my bike over the next couple months, just got to steal the unrestricted head from my current engine and it should be good to drop in once built.
Got a 200 mile memorial run in a week and a half so trying to get some miles on the bike and iron out all carb issues etc, I'll keep updated on how it all goes.
Here's a pic of the toys currently

@declan don't mind them but big tolerances to allow for the temperature variations kinda suck for tuning, also the water cooled R version is just a different bike all together, proper race machine.

Don't bother with the air cooled 600, get the 650r water-cooled, road legal Dakar racer