!979 Honda cb750 F SS

[matts79cafe]

I'm new  here so hello everyone.I have a few questions hopefully i can get some info on these issues.I'll start by saying i'm pretty new to the whole motorcycle world.I have been restoring classic cars most of my life from the ground up.Anyways I bought a 79 cb750 F a few years ago and finally have had time to start putting it together.It is basically stock as far as engine is concerned.I bought from a kid it didn't run and you how things go you get a load of crap about whats been done when buying things this way.Well i've told it had been rejetted,i rebuilt carbs found out that it wasn't and that it was missing parts everything has been replaced.It had the baffles cut out i replaced the baffles.It has a new ignition,(regulator,stator,etc).I'm running pod filters inwhich it came with.I don't have the original airbox.It is a cafe project.My questions are do i need to rejet for filters and what size do i need?tThe bike runs pretty good.Just recently i have gottin it to rev to 9,000 rpm before it would not,usually 4-5,000 then bogging.i'm not sure it was because i put the pods on from having nothing,or from the seafaom in the fuel.The timing is dead on i did bench synch with drill bit,i do relize that this is not exactlly acurate.But it does pretty good.Next question is if i were to change to a 4into1 roughly what size jet for that would i need?Like stated it does have stock jets,68,& 98's.It idles pretty goodaround 1100-1200,but like i stated just the other day at the same time i threw the pods on and added sea foam to fuel.I hope i have asked the right questions and gave enough information any help would be very helpfull.Thanks.

[sgtslag]

From what I've read on another CB750 forum, pod filters are never going to work properly, no matter what.  I would suggest you put the standard airbox on it, and move on from there (e-Bay, junk yards, etc.).  Check the valve clearances, which means the shims, first, and foremost.  Then start working on the jets, and sync'ing the carbs.  There is a lot of information available on this, and another forum, as mentioned before.  Here is a link to the other site:

http://www.cb750c.com/

Be sure to use the search function on the other site, first!  They can get a little testy about seeing the same questions posted repeatedly.  Other than that, they are a veritable fountain of useful information.

If you want/need a carb sync tool, you can make one for less than $5:  http://brogdensmuse.menofhonorministry.org/Bikes/Carb_Synchronizer.htm

The Factory Service Manual is available here, though, and that is required reading, period.  On the other site, they seem to tell, ad nauseum, about adjusting the idle mix screws(?) to 2.5-3 turns out, only.  Check their information carefully, as I may have the wrong screw.  Sorry.  Cheers!

[matts79cafe]

Thanks for the info.I had built the 4cylinder manometer.I do have the Clymer manual for 79-82 DOHC Fours book says to set think its the pilot screw on the bottom to 1-1/2 to 1-3/4 turns out.Most of the posts i have read says 2.5-3 turns out .Anyways thanks again for Everything.

[Re-run]

Well as stated before, pods are hard to work with. See these carbs require a vacuum to work properly and pods do not always provide enough vacuum. K&N pods are ok but the others are junk. So if you have the cheap ones, you may want to consider putting the airbox back on. If you do leave the pods, Get the bike on the road if you can and run it high through the gears and then kill the bike and pull the clutch at the same time and then brake to a stop holding the clutch. Now, carefully pull the plugs out and check their color. They should be a light tan color. If they are white, then you are running too lean in the main jet. You can also idle for a few minutes and check plugs and that will show you where your idle mix is.
If your carbs are clean, then you will not need seafoam. As for exhaust, nothing should change much going to a 4-1.