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Bob H
Joined: 01 Dec 2006
Posts: 43
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 Posted: Thu Dec 27, 2012 7:53 am Post subject: Pulsar-List Digest: 6 Msgs - 12/26/12 |
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912 should never be idled below 1600 rpm as low speeds cause gearbox to vibrate. Mine idles around 1750 rpm, smoothly.
Prop balance will effect vibrations. I use a static tire balancer to check prop and any minor corrections just require a spray shot of urethane spar varnish on backside of light blade.
Carb balancing has dramatic effect on engine smoothness; I'd check that first.
Bob H
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triumphrider
Joined: 18 Sep 2012
Posts: 25
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| Posted: Wed Jan 30, 2013 8:03 pm Post subject: Re: Pulsar-List Digest: 6 Msgs - 12/26/12 |
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Thanks for the reply, Bob. Sorry for the delay in acknowledging. I've been idling at 1800-2000 RPM.
I rebalanced the carbs on my 912UL and the Rotax proficient/knowledgeable mechanic found a sticky choke linkage on one carb during the rebalance/re-inspection. Choke was staying slight open on the passenger side carb a little bit and this was of course creating an unbalanced carb situation and rougher idle and cruise.
It was fixed, linkage was lubed and put back in working order. It was suggested that the return springs on the Bing carbs were ready for a replacement soon. Carbs were given a tune up w/ new gaskets about 100 hrs ago. Mechanic suggested a recommended Rotax every 200 hr Carb Rebuild with all new gaskets, hardware. I'll do it in the coming months. It was suggested all in-Parts and Labor at $600. For someone not interested in doing it himself-does this sound correct? Too High?
The Prince P-Tip prop has not been balanced. Would probably benefit from it, too.
Ironically, the Pulsar XP ran the BEST before my conditional inspection. It purred like a kitten. The Chinese say if it's not broken, don't "fix" it. Ha!
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Bob H
Joined: 01 Dec 2006
Posts: 43
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| Posted: Wed Jan 30, 2013 9:01 pm Post subject: Re: Pulsar-List Digest: 6 Msgs - 12/26/12 |
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I believe the Rotax requirement to rebuild carbs every 200 hrs is too conservative so they can sell parts.
If you flew in continuous dust storms or rain, maybe there is a need. But for most pilots, a rebuild every 500 hrs or more is acceptable. My engine has 850 hrs and I monitor carb condition and have not rebuilt them yet, although I replaced top diaphrams because someone gave me a pair at 300hrs.
I do lube moving parts to assure smooth operations.
To get best carb balance, I use a mercury manometer I made. There are $100 carb balancers that work fine.
The $600 for rebuild seems high to me but disassembling both carbs and doing it right would take time.
I do all my own work on engine and on other friend's engines including the replacement of old rocker arms with the steel or bronze bearings that seize up because of poor lubrication groove. The plastic replacements used on new engines work well.
If I can answer any questions, let me know.
Bob H
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