Using 'O' rings is a two edged sword. The size needed is a 010.
Definitely DO NOT use a plain nitrile 'O' ring as it will swell in a
very short period of time when in the presence of fuel and make it
impossible to pull the choke out. Viton is a better material as it
will not swell as quickly or as much when exposed to fuel, but it will
ultimately swell to the point were the choke cannot be pulled out. The
absolutely best 'O' rings to use are teflon, but it requires two in each
position to work correctly. Teflon 'O' rings are available from Tom
Bryant. Tom can be contacted at: tbryant@suscom-maine.net or 207-443-6338.
Before attacking the seals, check the screw that holds the linkage fork
to the bottom of the jet. The screw often loosen up and leaks around
the fork, making it appear that the seals leak. Removing the screw,
cleaning the threads and reinstalling it with some locktite will cure
any leaks at this point.
Cheers,
Dave
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