rayw
Joined: 18 Jul 2009
Posts: 25
Location: Wisconsin, Central
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 Posted: Sun Nov 29, 2009 1:42 pm Post subject: Re: Rotax 503 |
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Just wanted to update on the problem. I finally had a chance to run it yesterday after gapping the plugs to 0.018". It seemed to run a tad smother but did not help it gain any RPM. Last night I decided to swap carbs from left to right and try the "three finger test" again. While I had the carbs off I decided to pull all the jets and again verify the sizes. The sizes were all proper. I used a magnifying glass to look carefully at each one. I could see light through each jet when I held it up. before reassembling the carbs I took the main jet and needle jet and gently inserted the needles into each jet just to see how far they would go up the taper of the needle. One of the Main jets did not go as far as the other. I gently twisted and heard (more like felt) a subtle snap. The jet then slid up the needle as far as the other main jet would go. The best way to describe it is there was a crust build up in side the jet. Prior to this I did spray the jets out with carb cleaner but now I know that was not enough. Took it out today and tied it down and got it to run up to 6200 RPM.
Thank you again for all the helpful suggestions.
Ray W.
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