I am having a genuinely frustrating problem. I had the exhaust on both cylinders glowing red, after lapping the valves and refitting, same problem, two new exhaust valves lapped in, left hand cylinder seems to be ok, but right hand still glowing, lap valve in again, no improvement, bought second hand head, lapped on still same problem, stripped head again, lapped in valve, checked timing (Lucas Rita electronic, advanced very slightly.) exhaust still glowing, Help, anyone!
Air leaks on the intake side? Inlet stub to head, carb to inlet stub, Airbox/filter to carb all ok? You could try spraying some WD40 around the inlet side joints when the engine is running and see if revs increase.
Any chance valve timing out.
The right hand cylinder sits slightly forward of the left and so the bend is closer to the head on that side. I’m assuming your bike has single skin stainless pipes which are much thinner than the standard double skin chromed steel ones fitted by the factory.
Personally i would ditch the Lucas Rita!
Why? I’ll has been ok for the past 44 years, I fitted it because of the very poor starting of a previously owned T3, which could be a positive pain!
Hmm, I don’t think that is the problem, unless the timing chain has stretched more than a bit, may have to investigate that one.
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Just wondered if engine had been apart it could be. Carburation is my guess, what do the plugs say?