Re: IT RUNS!!

Posted by RodneyCB750K1979 on Apr 10, 2013; 3:55am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/IT-RUNS-tp4038986p4039179.html

Some thoughts off the top of my head:

Vacuum leaks in carb boots. Check each end of each boot. Are the boot clamps tight? My boots looked good until I removed them and found severe cracking and deterioration.

Make sure the sync tool connection port plugs are tight.

Check the carb pistons for cleanliness and freedom of movement.

Lube the throttle cables.

Make sure the throttle plates in each carb return to home position. I found during my carb reassembly the throttle plates would not close completely if there was the slightest pressure on the shafts.  The carbs not being tight on the two mounting rails could bind the throttle shafts. To fix, you need to loosen all the throttle plate screws, tighten the carbs on the rails, and then retighten the plate screws with the plates in their closed position.

Check the choke cable and arms and springs.

Confirm during high idle whether it is being caused by one cylinder or all four.  Place hand over the exhaust if you have 4 into 4 system or use a carb synchronizer gauge. If it is being caused by one cylinder, the problem could be easier to locate.

My bet is you have a vacuum leak or a throttle plate or carb piston sticking.