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07-22-2006 01:07 AM  14 years ago
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daved26

rrApprentice

NJ USA

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OS 70 PROBLEM
I had an OS 70 in my Freya until I decided to replace it with a 90. Just recently I decided to put the 70 back in it and use the 90 for another project. The 70 was sitting, wrapped in a rag in a plastic bag for about a year. When I took it out, it seemed ok (everything was lubed and it still turned over fine). After I got the model ready to go, I started up the engine. It started no problem. It seems to idle fine but when I increase the throttle, it starts to spool up and then stalls. This is very wierd. It always ran great until now. After it stalls, it will start right up again but as soon as I give it gas, it does the same thing. I replaced the glow plug with a new one and the fuel (cool pwr 30%) makes my OS 50 run great.
I tried adjusting the needle valves from very rich to very lean but the same thing happens. Any ideas?

Dave
"I wish my 9C had a reset button"
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07-22-2006 01:34 AM  14 years ago
Mr Majestic

rrNovice

USA

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Are you using a RevMax?...if so, make sure the wires are plugged in well. I had a RevMax causing a similar problem and I traced it back to a loose wire.

Also, could be crap in the carb. Try flushing it and/or disassembling and cleaning it.

Also, could be an air leak around the carb base.

Just a couple thoughts.

MM
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07-22-2006 01:57 AM  14 years ago
hellflyer

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Staten Island NY

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crap in the carb or you may have to tweek the needles untill problem disaepears verry common on three needle carbs its tricky to get all three in the ball park to keep it running untill you fine tune them all and on the two needles its much simpler set your low side needle and than adjust your high side needleThe first step in gettin help is admitting you have a problem ( yes I am addicted to helicopters )
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