Rhs Exhaust Hot Lhs Exhaust Luke Warm

Hi guys, i have joined here on behalf of my mate who is dyslexic.
the right hand side exhaust is hot and the left hand side is tepid, he has a 1960 T120. things i have done, compression test one kick 25ppf, 4 kicks 75ppf on both cylinders, ive swapped the carbs over, and the coils nothing makes any difference, ive set the tappets cold to 2tho inlet and 4thou exhaust, has any one heard of a this ,or know any reason why this would be happening. cheers steve

 

i forgot to mention that it has electronic ignition fitted. points where my first thought, and the spark is very strong both sides, the lhs does get hot eventually which made me think they maybe some difference in the set up on both carbs which is why i swapped them over, and the reason for doing the same with the coils just in case one was breaking down, i set both air screws to one and a half turns out, and adjusted each one very slightly in both directions, when i did the lhs the bike began to run a little rough but kept going, the rhs when i did the same caused the bike to stall, when i removed the plugs both are dark and wet, i cleaned them and did the same after running for 5 mins, both again dark and wet. if the lhs was not firing i would have expected a clean wet plug. i am puzzled.

 

I will swap the ht leads over today, some thing i forgot to do also check the flow of fuel from both taps, i will also try a timing light on the leads when running.

 

HT leads are fine, but timing light will not light up on lhs, pointing towards electronic ignition box, got some test to do on it tomorrow, ive checked coils on pick ups all good.

 

I have found the problem, First question i asked my friend was are the plugs new, his reply was yes. i should have tested them under load, i replaced the lhs plug and got an improvement, so that led me to raise the slide on the lhs, slowly i could hear the engine pick up , so i removed the carb and stripped it down, both side plug where wet, so i removed all the jets and internals and cleaned with carb cleaner, i also lowered the needle both sides by one notch, This improved its running , after i adjusted the mixture screws on both carbs its like new again, both pipes getting hot equally. Initially i thought that the mk3 box was at fault, but because it ran on one that could not have been the case as it contains a switching diode so moral of the story is check the basics first, despite what your told. Thanks for all your help.