Martin Harris - Moderator Posted February 13, 2009 Share Posted February 13, 2009 Hi. I have a FS400AR SC radial in my ¼ scale Stearman. The instructions that come with the engine leave a lot to the imagination (literally) it has an on board glow system powered by a 13000mah NiMh which dose the job very well. My problem is that I still can not get it to run smoothly. The idle is reasonable but takes 2-3 seconds to pick up when the throttle is opened. The top end is lumpy. The needle is open 1 turn and if I open it any more it runs too rich and if I close it any more it runs to lean and dies. When I say open / close Im talking 1/8 turn. There is also a breather nipple on the bottom of the engine. By all accounts following standard 4 stroke logic this should be open. If I leave it open it turns into a leak and fuel /oil goes every ware, the engine will not start. If I close the nipple the engine starts perfectly and runs as above but oil leaks from the push rod covers. When I open the nipple after a run I get an abnormal amount of oil from the crank case. The fuel I am using is 10%nitro, 18%oil the rest methanol. Any one had the same problem or any suggestions. Regards Kevin. Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted February 13, 2009 Author Share Posted February 13, 2009 Kevin, You're a lucky so and so to have such an interesting lump to play with! Why don't you download the OS manual for their 5 cylinder radial http://manuals.hobbico.com/osm/fr5-300-manual.pdf ...which I suspect will be very similar? Page 15 seems relevant...the nipple is a drain plug and should be in place for running. I suspect (never having been lucky enough to own anything like this) that the idle mixture may be grossly rich, giving a slow transition. Probably not helped by the volume of the common induction chamber that I suspect your engine uses? Quote Link to comment Share on other sites More sharing options...
Doug Ireland Posted February 25, 2009 Share Posted February 25, 2009 Have you seen my vid of my 5 cyl OS on you-tube? It idles perfectly at around 1500 RPM and flat out at 6500 on a 20x10 prop. And yes, the nipple at the bottom of the engine should be closed for running; open to drain. Quote Link to comment Share on other sites More sharing options...
Tony Medri Posted January 15, 2017 Share Posted January 15, 2017 Hi Kevin I have the same problem as you with my new FS 400 AR engine. Have you now sorted the problem ? If so any advise Manythanks Tony Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted January 15, 2017 Share Posted January 15, 2017 This thread is nearly 8 years old Tony........I suspect the problem has either been sorted or the engine binned by now.... Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted January 15, 2017 Author Share Posted January 15, 2017 If it was Kevin b he's still very much around on the forum...perhaps try a PM if he doesn't see this? Edited By Martin Harris on 15/01/2017 22:09:07 Quote Link to comment Share on other sites More sharing options...
kevin b Posted January 15, 2017 Share Posted January 15, 2017 I saw it. It's not me, but if someone has one and doesn't want it............... Quote Link to comment Share on other sites More sharing options...
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