2danglico
Joined: 08 Sep 2008
Posts: 17
Location: Seneca SC
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 Posted: Mon Sep 08, 2008 5:44 am Post subject: 447 needs some tweaking |
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I recently bought a used Kolb Firestar with a freshly rebuilt (4Hrs) Rotax 447 single carb. I'm writing in hopes of getting some advise on getting it tuned up. I'm a little concerned about the EGT/CHT temps I'm getting while operating at speed. I'm getting a lot of surging and stumbling. It's difficult to find a happy cruise RPM. Anything below 5000 RPM and it will slowly load up and begin to lose RPM and run rough. When I try to nudge the throttle up a small amount, I get a surge that puts me up to 5500 RPM. My EGT is only reading 850-900 and my CHT is reading 300-325. I assumed this was indicating a over rich condition but when I checked the plugs I found the healthy looking rust/brown color I've seen in the books. I'm thinking that I may benefit from dropping the neddle down one notch to lean it out and see if I can bring my EGT and CHT in line. Does anyone have any feedback or opinions? Any help I can get will be appreciated. -John
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