I traced my cutting out, misfires and poor running down to a faulty ignition switch contacts.When you tap the ignition with screwdriver the engine would misfire or cut out.
Good luck Paul.
Matt,
I fitted Koyo release bearing onto phosphor bronze carrier and adustable and spring loaded clutch operating rod as used inTR2-4 (RTR 1111) with Revington uprated clutch. Works fine for me.Was going to fit tilton annular clutch release mechanism, was told by Revingtons difficult to set up.
Good Luck Paul