Quote:
Originally Posted by Carl Spangler
Was the engine completely warmed up for the 'stumbly take off' test?
Here's another easy test:
Crack the thottle about half open and see how much side-play is in the throttle shaft. i.e. clearance between the shaft and casting. A proper rebuild would include drilling out the housing and pressing in a brass insert. If rebuilt properly there should be an 'interference fit' between the shaft and brass bushings. If not done properly this could be a source of air leak and whistle.
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With all the QC issues, I don't doubt that's a possibility one bit... A stiff return spring is the number one cause of throttle shaft wear..