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| Gas Engines and Power Discuss all aspects of giant scale power systems |
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08-27-2006, 11:14 AM
| #1 (permalink) |
| Is it spring yet?   Join Date: Aug 2006 Location: Southeastern PA
Posts: 230
 |  Help with Walbro / Quadra 100
Hi all, nice site here. I'm having a problem with my Q100B/Walbro SDC-80 and could use some expert advice. The motor refuses to throttle back, even with the throttle butterfly closed completely. After having to run the airplane (35% Edge) out of gas to land it,  I swapped carbs, which fixed the problem. Now it's starting to do it again with the other carb. I can't figure out how this is happening - both carbs have been torn apart and cleaned and there's nothing out of the ordinary as far as I can tell.Also, I just picked up a repair kit for the carb, and it has a couple metal disks in it. I'm not sure how to get the disks out of the carb to replace them or what they do. If anyone knows of a website that shows how to rebuild an SDC-80 that would be great. And any ideas on why the motor won't slow down. Thanks, Mark |
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09-04-2006, 01:15 PM
| #2 (permalink) |
| Is it spring yet? Join Date: Aug 2006 Location: Southeastern PA
Posts: 230
|  Solution to the problem...
It turns out that a high idle and refusal to quit even when the throttle is closed is a symptom of a vacuum leak in the crankcase. There was a bolt plugging a hole in the bottom of the crankcase that was leaking - sealing this up solved the problem.Mark
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