Work Done and Work Ahead...1976 Super Sport

Posted by Thfireman on Sep 12, 2008; 1:47am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Work-Done-and-Work-Ahead-1976-Super-Sport-tp458272.html

When I took delivery of this CB750F Super Sport it was located 85 miles from my house.  My Wife and I went up to look at it and decided to buy it.  It was running and I drove it home.  Visually it is in A+ condition.  Mechanical wise it is in running condition.. But:

It starts first time then idles smooth for a minute then speeds up, slows down, skips and pops ocasionally.  After warm up I take it on the road and it boggs if I accelerate rapidly but is smoother with slow easy acceleration.  At cruising speed it runs steady with a lag feeling from time to time and some hesitation.  If I try to open it up it boggs then takes off and will pop from time to time.  Now after it is warm it will stall at idle if I do not pump throttle while at a light or stop sign.

OK,  So I have had it a week and here is what I have done so far:

I added Seafoam to a full tank of fuel when I picked the bike up and drove it home.  Smokes under acceleration and it may be the seafoam.  It didnt do it when I test rode it.

When I got it home I pulled the tank and air filter box.
I took the carbs off and opened the bowls.  Red dirty gas was in bowls, some sediment.
I took jets off, pulled the float valves and and blasted all holes with cleaner, cleaned jets and floats and reasembled the carbs.  I didnt go into the tops of the carbs.
One of the float needles had the spring top jammed on the needle and I couldnt get it to move.  The needle valve was moving freely.
I checked the fuel tank for trash and drained a bit of fuel from the petcock and it was clean.
I replaced the fuel filter (inline)
The bike was reassembled.

It started and smoked and popped.  I took it for a ride and it runs about the same.  

I have ordered 4 card rebuild kits.

Observations:  I sprayed starter fluid over the intake boots and the engine began to speed up.  I noticed the boots are hard and drawn up.  They dont seal in the air box and they are too short to connect to the carbs correctly.

I have ordered 4 new intake boots.  

I havent adjusted valves yet but I replaced the plugs.

After the rebuild and the boot replacemnt and valve adjust what else can you all suggest that I do to get this bike in better running condition?

Thanks, Roger