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New to me Sportwin 9.5 question

D

dwarmbrodt

New member
Hello all,

New to this forum guy here. First post, but have had alot of questions answered by reading a boatload of posts so far! Things I have learned by reading first.

Provide year, model and part numbers.
Never just say "It has a pretty good spark".
Sooner or later the words carb rebuild will be heard.
Pics are worth a thousand words.
Theres more, but based on the frequency and quality of reponses to posts I will thank in advance Racerone, for his willingness to help us, including me I am hoping!

My yardsale find of a nice 1965 9.5 Sportwin Mod 9522C is turning out to be a fun challenge. Idle not so good, but at WOT runs great... for a minute. Then it seems like it is starving for fuel, or one cylinder is cutting out. Yes, the tank vent is open. Coils look great, new plugs and points are gapped .020, so for now I rule out ignition. Back to fuel supply. Can the fuel pump be taken apart, cleaned and reassembled without needing a rebuild kit? Does the leaf plate need inspection/maint? Lastly (for now) on the front panel is a control for Lean (Low speed adj). I adjusted every which way with no change. Then I popped the cowl, and observed there is nowfrickin linkage connecting it to the needle valve! See pic. I assume I can make adjustments by hand?
Again, thanks in advance for helping this new guy!

Doug
 

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Has the waterpump impeller been replaced ?--------------------Run it with a timing light on #1 and see what happens when it falters.-----------Have seen nice looking coils with a hole burned through and grounding to the mag plate.----------Carefully note position of coils and remove from plate to inspect bottom of coil.---------If motor operation improves by operating the manual fuel pump , then the fuel pump on the motor is suspect.-----------Pump repair kits are available.
 
99% of the time, cutting out on one cylinder is due to an ignition problem. That also includes spark plugs. But you are right, a leaking fuel pump diaphragm can also flood one cylinder. But I'd expect that to happen more at low speeds. Yes the fuel pump can be rebuilt, but it ain't easy, assuming it is the square one. The older "big" one is easy. Water ingestion into a cylinder can also make it cut out on one.

Sure, of course you can rotate the slow speed needle without the linkage. Keep in mind, it is only effective at idle speeds.

It is unlikely that the problem is due to the carburetor or reeds, since it runs WOT for awhile.

That year 9.5 never did have a real great idle. They shook themselves to death at idle. The problem eventually was corrected when they installed vibration dampers in later years.
 
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