Okay, i just finished everything on my '72 cb750 cafe project to get it rideable and see how its going to run.
Im running the dyna s ignition, 3ohm coils, velocity stacks, carpy's 4-1 exhaust.
The motor had not been ran in over 5 years when i got it and it had paper work showing just over 9,000 miles on it.
I completely tore down the carbs, soda blasted and soaked in a pine-sol mix for 3 days.
Rebuilt them with all new jets, mixture screws, o rings and gaskets and upped the jets and moved needle clips down to compensate for the exhaust and stacks. Also set float levels to factory specs and bench synched.
Being the first carb rebuild I've ever done I was amazed at how close I got on the jetting
I did all the routine engine maintenance i.e. , valve clearances, timing, cam chain tension, oil change, new plugs, etc.
Amazingly it fired up on just the 4th kick after turning over a while to get the oil cycled through.
And it runs perfect. Didn't skip a beat through all the throttle ranges and idles perfectly.
But I didn't notice a lot of smoke coming from the exhaust.
I expected some with how long the engine had been sitting and after it ran a while it slowed down some.
But its still puffs a little when revved. I took it for a spin about 5 miles and the smoke stopped to almost none but there's still a little you can see when reving off idle.
Got it back home and pulled the plugs. All were a perfect brownish tint except #2 which was slightly wet and black and smelled of oil.
It was still running perfectly even with it being like that.
My question is, could it be the rings in such a fresh motor? Or more likely valve guide seals from sitting so long?.
Would a compression check tell me if it was rings or not?
Or do you think seafoam or marvel mystery oil would loosen things up and it would be okay?
