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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Still problems with OS91 C-Specs PS with Viperhead
04-01-2009 03:55 PM  9 years agoPost 1
Arthur Dent

rrNovice

Finland

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Could someone help with my engine problem.

The engine is OS91 C-Specs PS(pumped) with Viperhead 60M carb.
I have OS8 plug on the mid and OS A5 on the second plug.
I use CoolPower 15% at fuel. Also I have the return needle

Now I'm phase that the idle is the problem.
The engine will get lean and lean and lean even I adjust the idle screw to 90 deg rich with original 60M carb.

I readed from RR that someone has used 60K assy on 60M carb and I ordered the OSMG6759 27081600 MIX CTRL VLV ASSY 60K from Ronlund. It arrived to day and I installed it.

I opened the OS manual and started all again from start.
Main needle 2 turns open and return valve 2 turns open and idle on the mid position.

First it idle quite smooth, but if I try to "float" the engine sounds that it's rich. I turn the main needle to 1,5 turn open.
After that, it still sounds rich. I do this when I have reached main needle position that it is 1/2 turn open. I can hover, idle is quite good after hover, but I haven't tested the full power or fast flight.
But it feels strange that it just 1/2 turns open. We have about -2 celsius degrees the air temperature, so maybe it will explain something.

I have also made cateye mod to 60M carb but I haven't tested it.

Is this ok that main needle is that 1/2 turn open or what is wrong?

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04-01-2009 03:59 PM  9 years agoPost 2
col

rrVeteran

U.K. Ipswich.

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use the mid needle for hover
or return needle as u call it. top needle is only for full throttle.

try that. i had the same motor, don't be suprised if the mid/return needle ends up at about 1/2 turn.
great motor by the way.

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