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that is a great question...I don't remember but I will let you know when I get to it in a few week-ends thank you for your feedback gents, happy father's day week-end..!

bike is stock; jetted a bit richer and with the adjustable metal/plastic floats (from a goldwing I think) instead of the rigid plastic ones. how white would u call a lean spark plug on these motors? 'cause they where always on the light gray side.

no no I meant the camshafts; when i ck'd the valves I did a visual check of the cams and chains. Valves are in spec at .08 intake and .10 exaust the plugs do look a bit on the lean side and I did fatten the jets a few years back; maybe re-jeting again?

I dont think you can.. only way is a switcharoo with another...but the other I have is also 45 years old...

do you know how to check a spark unit?

yep

yes, cleaned and synced...yet, I may just do that again..

consistent; but when I added an extra ground to the wiring harness she ran good for about 10min. that is why I am thinking more electric than mechanical..

thank you brettp; compression is very good and I checked clearance too, all in spec. I even took the crankshaft and the two cam chains out to see if maybe they had issues; all good. Plus the bike does not smoke and idles great. I think it is an electric problem and trying to figure out if...

My 8k miles 1980 750 C is acting up. Any time I rev it over 6k she start popping and coughing and I checked compression coils - with others I have - spark plugs carbs ignition timing, - with a spare - CDI - also with a spare - battery, plug cables rectifier but I just can't figure out...

yes the idea was to replace the studs with thicker ones because ultimately that is the one under engineered issue with these engines and the sohc ones. I think I remember the head coming out ok and the cylinders being the issue. anyway, thanks for feedback, I shall execute and report..cheers

thank you Sense, I guess I'll just go ahead and try it; yes, those studs will be tricky to get out and another garage rumor is there was a recall on it too. I'll be measuring old and new and see if there is any '40 years' let...

...is this at all possible? hello everyone.. a garage rumor says I can pull valve cover and head off, remove studs ( and maybe replace them) and then cylinder block should have enough clearance to be pulled out. anyone ever try this? thanks for any feedback! lou