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Hi i wonder if anyone can point me in the right direction. I am trying to get back into this hobby after a 13 year break (where does time go?) I used to be a member of a local club that I'm trying to re-join and i used to fly a WOT 4 with an OS 40 FP at the front, well its been stuck up in the loft nose high haung from the rafters all this time. I would love to get it up and running again but its all gunked up around the carb, so that the throttle arm wont open and close it so i guess that the rest of it inside  is probably the same although you can turn it over  with the prop, fells a bit gooey wondered how i go about cleaning it all up like new inside 'n' out ??? any help would be much appreciated in getting me one step closer to eventually flying again
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Hi Adam,
 
Soaking the engine in a bath of Methylated Spirits (denatured alcohol) aught to get rid of all that verdigris.
 
Best of luck getting back into it again... I watched many guys yesterday battling the 30 knot prevailing westerlies with their "40" trainers...  It made me wish that I had gone that path rather than a Foamie Electric trainer.
 
Cheers,
 
Hugh
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Adam if soaking alone wont free it up, try warming it a little, sit it on an old pan in a warm oven (cooker as me mother used to say) around 175-200 degree's F not Celcius fr maybe 5-7 mins DO NOT BAKE IT a little and often is way better, if you have one a sonic cleaner filled with methanol/ethanol will free it nicely, its the oil (castor I suspect) that turns to varnish and gets sticky.
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Be careful of cleaners, especially the citrus based ones-if you don't run the engine straight away after using them they can cause terrible corrosion. In my experience, warming with something like a heat gun, followed by a few squirts of fuel will free up any plain bearing engine. I freed & started a 30 year standing AM15 the other day-took about 10 minutes from seized solid to running perfectly. Don't use WD40-the silicones in it can destroy the catalytic reaction of the glow plug.
hope this helps
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