New 1982 cb750f

[TOOLS1]

I would start with the idle. Check the throttle control, and the cables.
TOOLS

[tangylee]

thanks tools, it was the carbs of course

[sgtslag]

Have you cleaned out the fuel tank?  If the bike sat for a long while, it may have varnish deposits within.  The rest of the fuel system may have varnish build-up, as well.  I would suggest adding the correct amount of SeaFoam to a full tank of gasoline, and run it for five minutes, to circulate it through the entire fuel system, then shut it off, and let it sit overnight.  This will give it time to dissolve any crud in the fuel system.  It isn't magic, but it does a good job on varnish.  Cheers!

[mikefootusa]

Add about 2oz of Seafoam to each gallon of gas in your tank...run it for a min and shut it off...let it sit for an hour or two...repeat.
Worked for me...!982 cb750sc Nighthawk...bought Sept 1...had been sitting in a barn for a few years.  

[tangylee]

Nice. Thanks for the info yall. Ill be doin the seafoam when i get it all back together. I got my brand new carb boots in yesterday. very exciting.   For all those who know about the cb750, how bad are my valve clearances? Im thinkin i should get all new valves. the clearances are; intake, right to left: 003 .003  .003  .002  .003 .003 .0015  lessthan .0015    and the exhaust are: .003  .003  <.0015 <.0015  <.0015  <.0015  <.0015  <.0015.   So its pretty urgent i get new shims right? and what clearance should i go for? I have read on this forum all the way up to .005'' might be the best. any suggestions? i know the manual doesnt know sh.. about this subject