...continued
Next a dummy float chamber.
The throttle lever isn't drawn but appears to screw onto the end of the throttle barrel. I roughed out a shape from a piece of 1/8" aluminium.
Now spot the challenge! I couldn't screw it right on as it fouls the manifold. In the end, my cure for that was to drill the thread out and clamp onto the outside of the thread. I may have to turn up a new barrel with just a plain shank for the lever to grip.
Quite a lot of time with a needle file but I am pleased with the result.
Finished and ready to fit!
Investment cast valve rockers.
Decided to bite the bullet and lap the cylinders. First job was to make the lap and used a taper pin reamer to machine the bore of the lap. I then set the reamer up in the chuck to allow me to set the topslide over at the right angle.
The mandrel was just a bit of bar out of the drawer.
I tapped the lap onto the taper and machined it to size before removing it and cutting some slots with the hacksaw. One went right through of course.
I then loaded it with Autosol metal polish and held the block while rotating the lap. as the lap eased off, I just tapped it up the taper a bit more for another bite. The bores come up surprisingly quickly so there was another job done. By the way, I took the picture with the lathe stationary as two hands and careful concentration were required to avoid disaster!
Part 20 here
