O.S. FX 1.60 Starting - Problem Apparently Solved! - Page 3 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-04-2008, 03:44 PM   #21
Ed Smith

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Possibly. A leaky crankcase could affect the overall performance. The piston downstroke forces the fuel up into the combustion chamber. Loss of crankcase pressure will affect this.

Crankcase pressure can be used to operate certain types of pumps or to apply pressure direct to the fuel tank similar to muffler pressure. However, crankcase pressure direct to the tank will result in a very poor idle.

So, I assume you have muffler pressure going to the tank, then seal the crankcase.

Ed S
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Old 02-09-2008, 09:59 AM   #22
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Hi Again Gents: Yesterday I went at it again with the O.S. 1.60, and after trying very hard to start it on idle (starter, hand flips, etc.). So I advanced the throttle to about 1/3 or so, and then, bang, instant start! High end excellent, but it just wouldn't go below 1/3 throttle, invariably dying in the process. So I opened the mixture control screw 1/2 turn, restarted it on 1/3 throttle, and with some trepidation, proceeded to reduced throttle. To my surprise, I could go just keep throttling down all the way to full idle, and keep going down with the trim tab until I got a reliable 4 stroking! Next I let it idle 4 stroking for about a minute or so, and proceeded to increase throttle with authority. I noticed that there was some hesitation with smoke and fuel coming out the exhaust, which I recognized as a sign of the mixture being too rich. I closed the mixture screw 1/4 turn and tried the transition again, this time, the engine transitioned with authority and no hesitation. I then cut the engine off, and attempted to start it by hand with the throttle setting on idle. It started on the first flip! So my conclusion is that most - if not all my problems - stemmed from a mixtuure control screw that was far too closed to allow the engine to operate and/or start on low throttle settings. I also learned a valuable lesson which may sound stupid to some, and that is that an improperly set mixture control screw (or low speed needle valve in some carburetors) can upset the performance of an engine substantially. At 45 years of age, I still consider myself young enough to keep learning every day. I thank everyone on this thread who offered assistance.

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Old 02-09-2008, 10:20 AM   #23
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Nice job solving the problem

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Old 02-09-2008, 10:26 AM   #24
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Re: O.S. FX 1.60 Starting - Problem Apparently Solved!

Originally Posted by eduardo
Any help would be most welcome, before I throw this engine out!

Glad it didn't come to this! Very informative thread, I've enjoyed the read. Glad you've got it up and running again.

Ben Hindmarsh

"I keep planting planes, but they just won't grow!"
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Old 02-09-2008, 11:15 AM   #25
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Key words failing to pop

I have done a lot of winter flying! The first thing to try is a propane torch. Warm the head and cylinder, warm is fine. I use a 2V battery with a germanium diode in series or two nicad cells with a silicone diode in series. I found that those single nicad cells just did not have enough power in cold weather. The internal resistance of the diode drops the voltage to a reasonable level. If it fails to continue running after it starts there are two reasons. 1. The plug is not hot enough. 2. You need more nitro. I also found that fuel stored in plastic containers deteriorated a lot faster than when stored in metal containers. Of course some fuels are made with second rate alcohol. Hope this helps. Kip
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