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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › YS91 or OS90 CSPEC w/pump
11-08-2004 02:03 AM  13 years agoPost 21
sharam

rrElite Veteran

Northern California - Fly at Morgan Hill Field

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OS 91 Cspec pump is a pain to tune. i can't get it to run well on Wildcat 30% - it's running OK on Magnum and Coolpower but not nearly as reliably as my YS 91.

YS 91 is a set and forget engine. I am yanking out my OS in favor of a YS.

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11-08-2004 07:13 AM  13 years agoPost 22
ShuttleSmasher

rrApprentice

Owner of TheModelWorx.co.uk

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I got a c-spec non pumped version and have not had a single problem with the engine i can't believe poeple are having problems with this engine. Its the smoothest , most powerfull engine i have ever had. I slowly leaned the engine from the first gallon and the power just keeps getting better. I love it. I found Magnum to run sort of bubbly, just switched to wildcat 30% edl and its real smooth.

Gary

Team Dyna-X

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11-16-2004 09:36 PM  13 years agoPost 23
cjcraigj

rrApprentice

Worcestershire, England , UK

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Hi guys
I run an OS C-spec PS in a Rapotor 90 on my Wildcat 30%. Was running real nice unill i had a crash and it aint run correctly since, Iv now sent it back to Irvine (UK Dist) for them to take a look, i think the Pump was faulty after the crash so im sure they will just replace it and it should not cost too much.

Before this the engine was running nice, dead cold even tho some people said it sounded lean. But it was running real nice and cold and i could carry on leaning it maybe about 3 to 4 clicks more than i was before it got warm, and the power would just keep on getting stronger.

I would be intrested in knowing how People in the UK are getting on with the YS as I may try one in my next Model. I know there happy out in the US with the YS but these engines are very sencitive to temp and altitude so i would like to here some UK peoples view before i buy one.

Saying thats theres nothing wrong with the OS 91 C-spec PS

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11-16-2004 09:51 PM  13 years agoPost 24
mrNoodles

rrProfessor

Borlänge, Sweden

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Me and my friends have been running YS for 2 years here in Sweden, without any problems due to weather.
After all, its known as a set and forget engine

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › YS91 or OS90 CSPEC w/pump
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