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HelicopterMain Discussion › the best 90 class engine and muffler ??
10-19-2004 04:34 PM  13 years agoPost 1
Jason WAI

rrVeteran

Hong Kong

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For a 90 class heli, I'm thinking which one I should choose .......

YS90ST, OS91 C Spec or OS91 C Spec with PS pump
( Please advise If i had missed something)

and from your opinions, what is the best muffler to go with the selected engine......


would you mind sharing with me your idea ?


Thanks,

Jason

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10-19-2004 04:35 PM  13 years agoPost 2
RotorX

rrKey Veteran

London

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You missed the all powerful west91+weston tuned pipe combo

YS 91 with a hatori sb16HF

OS 91 c-spec (pump or not ) with a MP2

.

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10-19-2004 04:41 PM  13 years agoPost 3
cjw

rrVeteran

UK - Cheshire

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I started off with the OS C-Spec (no pump) on MP2. Genrally OK but after a while I couldn't get it to idle realiably and it became a real pain to start - due to the idle problem.

Switched to a YS91 (still on MP2) and it runs very well, I much prefer it to the C-Spec.

Clive

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10-19-2004 05:16 PM  13 years agoPost 4
dariof

rrVeteran

Henderson, NV /​Laguna Niguel, CA

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You're going to get a ton of opinions on this one

I use the YS with the MPII. Worked well thus far.....about 200 flights or so.

Best Regards, Dario

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10-19-2004 05:27 PM  13 years agoPost 5
Furious Predator

rrProfessor

Kitchener, Ontario,​Canada

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I'm running a YS80 with an MPII with great success, i have never felt the need to go any higher. i raced against someone using the OS90 c-spec and the performance with his OS90 and my YS80 was identical. Just for the sake of it though i may later on switch to the YS90, but i hear its difficult to set up. Can anyone give me their experience with the YS90?

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10-19-2004 05:49 PM  13 years agoPost 6
Syclic

rrApprentice

Northern Hemisphere​Ont.

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I love my YS91's on both the Hatori and KSJ muffler system. Probably the most user friendly (easy to set-up at any rotor speed!) systems I have ever used - power=WOW, smooth=ahhhh

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10-19-2004 06:31 PM  13 years agoPost 7
Helinut29

rrApprentice

Bridgeport CT.

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the best 90 class engine and muffler ??

I have the following:

2 OS 91's C-Specs with MPII's = Flawless awsome power
1 YS 91 with MPII = Incredible power awsome combination

2 YS 80's with MPII's = Flawless awsome power

Cant go wrong with either combo listed above.

Im back from the Dead :)

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10-19-2004 08:45 PM  13 years agoPost 8
sylphideandy

rrNovice

United Kingdom,​Banbury

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I think the answer may depend on the target model.

I have a YS 91 on a Zimmerman muffler and it is perfect - although this is on a JR sylphide.

I chose this combo after seeing other flyers struggle with starting the OS, plus the YS 91 is the same physical size as a 60 size engine - enabling easy fitting.

After a long term OS fan I am now a YS convert.

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10-19-2004 11:19 PM  13 years agoPost 9
Conrod

rrVeteran

Mount Dora , Florida

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Don't have the OS, but seen many posts requesting help for their 90 size.
YS 91 Rocks! Easy setup with SB 15 or TB 16 and 30% Cool Power

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10-20-2004 03:16 AM  13 years agoPost 10
snookfishnjoe

rrVeteran

manatee county​florida

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FORD OR CHEVY,
pretty much

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