Os FS-70 Surging  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Os FS-70 Surging
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Os FS-70 Surging - 4/24/2002 12:54:47 AM   
Peter_OZ



Posts: 4781
Joined: 6/5/2002
From: Brisbane, , AUSTRALIA
Status: offline 		I have a new FS-70 fourstroke in my Astrohog. It continually surges at high throttle seetings. No matter how I adjust the needle valve it still does it. I have muffler pressure to the tank and the tank is correct height. There is no pump on this motor Fuel is 5% nitro, 18% coolpower, 78% methanol. appreciate any advice thanks cheers Peter
       Post #: 1

Os FS-70 Surging - 4/24/2002 1:12:22 AM   
HavinFun



Posts: 189
Joined: 3/5/2002
From: Crestwood, IL, USA
Status: online 		I use Wildcat 15% Extra, all my 4-strokes love this stuff. I used some Omega 15% once and noticed on my 91s the rpm would surge/fluctuate at full throttle. CoolPower 15% also runs great.

(in reply to Peter_OZ)
       Post #: 2

I have os 70 surpass - 4/24/2002 2:59:00 AM   
Shortman



Posts: 5971
Joined: 2/25/2002
From: Clovis, CA, USA
Status: offline 		I also have used wildcat fuel with great results. My local hobby shop sells wildcat but put there label on it. This is what it is nitro 10%, 18% oil content, 80/20 synthetic castor blend works great

(in reply to Peter_OZ)
       Post #: 3

Os FS-70 Surging - 4/24/2002 7:48:50 PM   
rctrax



Posts: 597
Joined: 5/11/2002
From: Mosinee, WI, USA
Status: offline 		You might try checking valve clearence espesialy exhaust valves

(in reply to Peter_OZ)
       Post #: 4

Os FS-70 Surging - 4/25/2002 12:44:38 AM   
Shortman



Posts: 5971
Joined: 2/25/2002
From: Clovis, CA, USA
Status: offline 		speaking of valve clearence, i need to check that!

(in reply to Peter_OZ)
       Post #: 5

FS70 surging - 4/25/2002 8:51:37 PM   
Peter_OZ



Posts: 4781
Joined: 6/5/2002
From: Brisbane, , AUSTRALIA
Status: offline 		thanks for the tips guys. i hadn't thought of valve clearance as it is a new donk. I did take muffler pressure off and it now screams along however the low and mid range transistion is awful. I will have a play with the valves then the other adjustments and see how it goes cheers Peter

(in reply to Peter_OZ)
       Post #: 6

OS 70 - 4/25/2002 9:08:00 PM   
FIVESQUARE



Posts: 625
Joined: 12/9/2001
From: little rock, AR, USA
Status: offline 		Just for grins....Check for an airleak......The fuel tank plug would be a good place to start...Make sure screw is gutentite.Then replace all fuel lines with "good stuff". Good Luck, DOC

(in reply to Peter_OZ)
       Post #: 7

OS FS-70 Surging - 4/29/2002 3:36:36 AM   
Peter_OZ



Posts: 4781
Joined: 6/5/2002
From: Brisbane, , AUSTRALIA
Status: offline 		thanks for all the advice guys I checked the valves and they did require adjusting. They are now set and it has helped a bit. I tried with and without muffler pressure. It really does like no muffler pressure so that is how it is set up now. Engine is screaming along and I can pull inverted passes pulling neg g into the horizontal with cutout or faltering. Vertical stall turns and square loops are now also possible cheers from downunder. Peter

(in reply to Peter_OZ)
       Post #: 8

good! - 4/29/2002 3:46:55 AM   
Shortman



Posts: 5971
Joined: 2/25/2002
From: Clovis, CA, USA
Status: offline 		glad to hear it running good.

(in reply to Peter_OZ)
       Post #: 9

RE: Os FS-70 Surging - 5/22/2008 11:09:34 AM   
speedair


 

Posts: 71
Joined: 10/31/2007
From: bangorwales, UNITED KINGDOM
Status: offline 		Use 10 to 15% four stroke fuel

(in reply to Shortman)
       Post #: 10

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