Which 90 engine ?

[Disc]

Guys,

Looking at 90 engines for a 90 machine.....

YS 90 SRS or OS 91 engine ???

Grrr which one ???

Will be running 20% optifuel my flying does not require 30%....

[Sao]

One vote for YS from me

[Aidi]

I am flying both my 700's with the OS91HZ and they run sweet. Both running on 20% as well.

I would say one is as good as the other for most flyers. Do take into consideration that Probuild who are the UK supplier for YS offer super after sales service.

Rgds
Aidi

[t-rex pedro]

YS all day long. Great power, easy tuning and cheaper than the OS regulated equivalent. Also, spares and back-up support from Probuild is second to none.

[mattie-lodge]

Disc,

I would whole heartedly say YS. I've been running them for a good couple of years now with great results. Its not to say I haven't had a few niggles like everything, but these problems are very 'get overable' and we have great backup in the UK for the engines.............(as Pedro's previous post says)

However what choice you decide to make I'm sure it will be the right one for you.

[ChrisP]

My reply would be YS too . Got two SR's (not SRS) and they run great, running 20% opti. Had a little problem with the check valve once, but that has been it for 6 months so far. Got one of them tuned spot on at the moment and haven't had to touch the needles for about 5 months

Great back-up from pro-build and the spares are reasonably priced too

[Jamin_00]

Having had both

Even though I had grief with my YS I would still say YS. As others say you can not beat Probuild on after sales care, ask me how I know lol.

I look at it like this, OS are more plug and play, easier to tune and ready to go, the YS needs a little more tweaking but is more consistant, powerful and smooth but after seeing Pauls OS HZ today I could not believe it was an OS as it was soooo smooooth.

But YS still gets my vote

[KnifeEdge]

I would say an Os91hz non pumped runs really smooth, and less to go wrong

[Tom Burgess]

YS vote from me

[Tim Procter]

YS vote from me too.

Changed from OS to YS and wish I had some time back now.

Pro-Build are excellent with back-up, and spares are disgustingly cheap compared to OS = Overpriced Spares.

[jamiem]

YS Been using them for 3 years now, had 3 91ST's and 2 91SR's, and all have been great, dead easy to tune, and make great power

[moonmanflyer]

My YS91SR has more power and runs more consistant than my OS91HZ thats for sure, so YS for me too