ASP .91 2s Running problems - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-10-2010, 09:13 PM   #1
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ASP .91 2s Running problems

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I have an ASP .91 2s and I cannot seem to get the high speed setting to settle down. Every time I throttle down then back up I have to re-adjust the needle to get it to peak again. I am using 15% fuel with 20% oil and a 14X6 prop. It seems to have a higher compression than it should, are they made for FAI fuel. Does anyone have one that runs properly? I even tried a perry carb on it and the result is the same.

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Old 09-10-2010, 09:25 PM   #2
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Re: ASP .91 2s Running problems

Maybe sucking air at the high speed needle, try a short piece of fuel line over the needle and see what happens. Change the glow plug as well if that doesn't work.

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Old 09-10-2010, 10:42 PM   #3
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Re: ASP .91 2s Running problems

read this article

You have basically grasped the problem. High compression makes them difficult to tune with high nitro fuels. Try FAI fuel or 5% max. You may need to add a head shim to lower the compression. No big deal Magnum parts will fit and are readily available from Hobby People. (Magnum is the N American label ASP in the rest of the world)

On some carbs the needle is a little sloppy so a piece of fuel tube fixes the problem. I have heard that an OS needle will fit or get an OS needle o-ring.
Haven't tried this myself but seems possible as these are after all Chinese knock-offs of OS engines.
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