Honda-SOHC

Got the 400-4 on the road and passed the MOT last week. It seems to run ok but has a lot of transmission noise on both acceleration and overrun. I haven't ridden another one so don't know how they normally sound. The noise is not there when running in neutral but it sounds a bit clunky if I unscrew and remove the oil filler whilst it's running. Still quiet if I engage first gear but the noise starts when I feed in the clutch even before starting to move off. It sound like it could be from the clutch / primary gears and there was a bit play in the cush drive when I assembled it. I have a feeling it might be the primary gears not meshing correctly. Does anyone know where I can get new cush rubbers from. I have tried to contact ttr400 but did not get a reply.

I got the 400-4 engine running last after week after a complete overhaul. I hooked it up to a small temporary fuel tank and all seemed ok initially, it ran on all cylinders although idling was a bit lumpy, however after playing with the air bleeds I settled 2 turns out and went on to balance them with vacuum gauges and it didn't take much adjustment to get a good balance.
After this the engine ran much smoother although there seemed to be a bit of a flat spot on the transition from idle jet to main. I checked the ignition timing with a strobotorch and decided to leave it at that until I get it on the road.
However two of the carburettors started to drip fuel which was really annoying as I was careful to set the float levels at 22mm so I decided to remove the carb's in order to re-check the float levels but after reading some older posts on this forum regarding carb' problems I decided that the floats might not all have the same buoyancy after 40 years so I made a set of adapters to fit into the bowl drains with short clear plastic tubes in order to see the actual fuel level in each bowl.
It was found that on the 2 which were dripping from the drains the level gradually rose whilst the others remained constant and therefore the problem was leaking needle valves, this turned out to be tiny pieces of cotton fluff where I had used a cotton cloth to wipe out the temporary tank and hadn't fitted a filter into the line. Lesson learned, and a quick trip to the local garage for a 2 quid in line filter should resolve the problem.
After checking all the needle valve were free of dirt I re-filled the bowls and this time they were remarkably consistent and settled at about 3mm below the joint so after leaving them for a couple of hours I am satisfied that all is well and I can now re-fit them and prepare for the MOT test.

What I take from this is that it's easy to blame faulty components for some of our problems but in my case it was a very small almost invisible foreign bodies that were to blame.
 

Does anyone have a spare plug from the 400-4 oil gallery points side. Its item 72 in the parts book. Called 'cap B, oil path
Mine had been brutalised by a PO. I managed to get it out but its pretty much destroyed and may leak.

I've been poking about on tyre suppliers websites and got a bit confused as I can't find matching TT (tube type) for front and rear in the the same make. Obviously they need a tube, but do they need to be TT type?
A local supplies pointed me toward Pirelli City Demon, Has anyone got experience with them?

I've started stripping my 400-4 and a few things are already apparent, but the main one at the moment is that mine is an F1 and the pillion foot pegs are attached to the swing arm, the pivots are really badly worn and will need to be re-worked somehow but has anyone modified an F1 to mount the foot pegs on to the frame and if so is there a kit or modification parts available as I thinks it's a bit stupid to have the pillion passengers feet on an unsprung part of bike.