Posted by pete 23 on February 08, 2011 at 16:39:22 from (173.87.15.134):
In Reply to: 460 questions posted by NolanJae on February 08, 2011 at 14:47:45:
Heat riser is on the manifold. Has a spring loaded weight with a butterfly inside that directs exhaust gas around the intake portion of the manifold directely above the carburetor. It must work free with a spring that is in good condition. Problem is over time they either stick, or burn up inside manifold and also the passages around the intake become filled with carbon and the only remedy is to take them apart and completely clean and replace worn out parts. Weight should be straight up and down in cold positon and pretty much stay there in cold weather unless worked heavy for period of time.It moves about 80 - 90 degrees full movement toward front of engine if working correctly. Getting the manifold apart is hardest part, cleaning those passages around intake is difficult also. I always took them apart on every valve job or overhaul on all those little six banger gasoline engines and that way they usually weren't as bad to get apart.
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