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Magnum XL 91 RFS 4-Stroke Engine

Old 07-09-2005, 06:40 PM
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flyer-2
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Default Magnum XL 91 RFS 4-Stroke Engine

Hello!
I was looking at the Magnun 4 stroke engines for my first 4 stroke engine. I have had 2 stroke magnums in the past, and I wasn't very happy with them. I was just curious if the 4 strokes where dependable and ran good. Are they worth the money?
Old 07-09-2005, 06:43 PM
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exeter_acres
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Default RE: Magnum XL 91 RFS 4-Stroke Engine

No problems with mine

I fly it in a 4*60 for now and love it.....very little tuning and quite reliable


as with ANYTHING...your results may vary
Old 07-09-2005, 06:59 PM
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Robert Bauer
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Default RE: Magnum XL 91 RFS 4-Stroke Engine

I love mine ( 4 years) no problems, very little maintenance. Quite a few out there and I don't know of any complaints. I am sure there are some though.
Old 07-09-2005, 07:04 PM
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Flyboy Dave
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Default RE: Magnum XL 91 RFS 4-Stroke Engine

The Magnum .91 is probably the best one to get, for your first 4-stroke. They
are fairly inexpensive and easy to tune and maintain. Hobby People usually has
them on sale for $150.00, and has ALL the parts in stock. I've been running them
since they first came out.

The Master Airscrew 12-8 K series wide blade is the perfect prop for general use.

FBD.
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Old 07-09-2005, 08:43 PM
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w8ye
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Default RE: Magnum XL 91 RFS 4-Stroke Engine

I have five of them and no problems.

Enjoy,

Jim
Old 07-10-2005, 09:34 AM
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J-3
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Default RE: Magnum XL 91 RFS 4-Stroke Engine

Hi Flyboy Dave, What kit/manufacturer Cessna do you have? I like the Cessna's and that paint color.
Thanks...Brian
Old 07-10-2005, 10:31 AM
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Flyboy Dave
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Default RE: Magnum XL 91 RFS 4-Stroke Engine

Brian,

....that is a "no-name" generic Chinese ARF I got off e-Bay last fall. The fuselage
is all fiberglass, as well as the engine cowling and wheel pants. The plywood
inside is all laser-cut....nice plane for eighty bucks.

FBD.
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Old 08-17-2008, 10:02 AM
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lee292
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Default RE: Magnum XL 91 RFS 4-Stroke Engine

Had one of these in a .60 size Waco and it's now in a Sig 4-Star 60. No problems whatsoever. It will sit and idle forever and then transition to full throttle without any glitches. Great engine for the buck!
Old 10-10-2013, 06:22 PM
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I recently got a sig liberty sport biplanein the bones. I have re covered it but am in a quandry about power.i sold most of my engines and have was thinking electric conversion but frankly its easier at this point to just hang a 4 stroke.i have had several satios but at this point I hadnt planned on having this plane so I really am not looking to heavily invest in power but I did have a magnum 2 stroke and it ran fine on a pattern. The plane I have is about 5.5 less than 6 pounds .so is the magnum 70xl big enough to fly a liberty sport .I feel its probably as powerful as my os 70 that I had and while a satio 72 is great I dont want to blow my limited budget on satio at this point.a y input is alaways welcomed.
Old 10-10-2013, 07:53 PM
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I have a Magnum .70, an OS .70, a Saito .72 and I had a Thunder Tiger .75. They all run about the same. The Maggie takes longer to break in than the OS. (A lot of engines do.) The Mag .70 is a copy of the OS .70 Surpass. Excellent engine. I have owned all sizes of the Mag 4-strokes up through the 1.20(.30, .52, .61, .70, .80, .91, 1.20). Best ones for the money. I also have 4 Saitos, so I can compare. If you ever have any trouble, Global Services is excellent. Don't go looking for parts, send it in and it'll come back running great for very little cost, in my experience.
Old 10-11-2013, 03:29 AM
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Thanks.i have been in the hobby a very long time.while I love my satio for this proje t I cant justify several hundred for a satio 72.the magnums I had ran fine.and I had os 70 as well.so if I have to spend a little more time breaking it in so be it.when you break it in how many tanks before putting it inthe air.what props have you used?
Old 10-11-2013, 11:27 AM
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The Master Airscrew 12-8 K series wide blade is the perfect prop for general use
One tank on the ground, and you're ready to go.
Old 10-15-2013, 09:46 PM
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jeffie8696
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Buy new with a warranty, it paid off for me.
Old 10-16-2013, 08:50 AM
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I have worn out one and I am on the second one. I use a 14 X 6 prop and it is good for me. One day it would not idle very well and I found have of the intake manifold gasket was missing. Yet it continued to run at high speed quite well. Replaced the gasket and she regained her idle. Great engines for the money. For the record, I never owned any Maggie two stroke engines, just four strokers. I also have Saitos and OS four strokes and they are good performers too, just cost a whole lot more at the outset.

And the Maggie .91 chugs along on 10% nitro fuel just fine. I use a blended fuel and often add a couple of ounces of Castor to a new gallon of it. That seems to keep the Maggies quite happy.
Old 10-17-2013, 11:02 AM
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The APC 13x6 is a good prop for those 70 sized 4 strokes mentioned, especially for the Saito 72.

The Magnum is about $100 cheaper than the Saito and the OS is about $70 more than the Saito. You have a wide price range with those 3 choices. I would lean towards the Saito due to how well they run, reliability, and longevity over the others. My Saito 72 is one of those engines I wouldn't ever part with. However, I like the Magnum 70 too when you consider the price and what you get. They're easy to tune. Engine prices are crazy.

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