Quote:
Originally posted by ctaylor738
Maybe I am getting my 280 and 250 mixed up, but I think that the 250 has a flexible tube about 2" in diameter that runs from the exhaust manifold to the air cleaner "snout." The theory is that the manifold warms the air until the engine warms up, at which point a flap in the air cleaner snout closes off the warm air.
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My 71 250 was missing the hose but was set up for this.. of course in southern california it doesn't need the extra help warming up.
Are the carbs especially the rear one almost too hot to touch after the engine has warmed up? If so the heat risers are probably stuck open and the carbs are probably warped.
If you put a folded shop rag over the top of the carb while the engine is running will the engine stall? If not then you probably have a leak in the carb. If you plug the idle air bore with a ballpoint pen does the idle change? If not then you definately have a leak.
BTW.. Jaime says his online zenith manual willbe back inaction in a couple of weeks. JaimeKop.com
Here's a link to the carb synchronizers
http://jcwhitney.com/product.jhtml?CATID=5520&BQ=jcw2
Baum has the hood adpater but the links are broken on their website.
http://www.baumtools.com/