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Magnum Engines XL 91 RFS Blue R/C 4-Stroke Engine

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29 Review(s)

Availability: In stock

$189.99

No. 210868

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Magnum Engines XL 91 RFS Blue R/C 4-Stroke Engine

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User's Guide (259.9 KB)This is the User's Guide for the Magnum XL .91RFS Engine

Customer Reviews

Items 1 to 10 of 29 total

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1st one great, 2nd one not so great Review by At6 Flyer
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First 91 awesome performance. Installed it in my Top Flite P47 and after three seasons runs like new. Second 91 not so good. I installed it in a Top Flite AT6. I broke it in as manual recommended using 10% fuel containing castor oil, Omega brand. Just started my second season and engine threw a rod. At least the plane was on the ground. OBTW I'm out of the warranty period.
(Posted on 5/26/14)
engine repair Review by airman10
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I got my engine back from repair ran better than when out of the box and really quick service too. (Posted on 4/26/14)
so far runs great one little issue` Review by Tripacer
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got mine up and running today for the first time in 50 years of modeling i followed the instructions on how to break it in even went and bought a NEW gallon of fuel set up as per instructions fired right up was WAY to Rich (would quit if you pulled plug wire off) leaned it out till the HIGH SPEED NEEDLE Bottomed out but at least you could pull the wires off and it would stay running ran a whole tank through (10 OZ) decided to figure out why it would run so rich with the HS needle seated took all apart and came to the conclusion the Needle was BENT and would not screw all the way down with out binding borrowed one out of my Magnum 46 2 stroke and now after 3 tanks i can adjust the needle all the way in or out and i think its time to go fly this beast
im giving it a 3 star for the bent needle have sent an email to there Service dept will see how good the service is should be a slam dunk just replace needle (Posted on 4/19/14)
breaking in Review by airman10
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I was breaking in a new engine had ran a tank full though it and when almost through second tank it engine made loud noise and quit threw a rod.I have one with many hours on it.I think it was defective,it back under warranty (Posted on 3/11/14)
Lack of parts availbility Review by Single stick
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Michel, our apologies for out of stock parts. Please know the crankshaft is now in stock. Matt


91 magnum in super skybolt .Flies great, engine all you need,smooth and steady.. Less than 2 hrs. running time suddenly stops . Remove engine from plane and remove back plate.. Crankshaft pin sheered off as if cut with a laser! 13 month old engineso no warranty. Tried to obtain a replacement part with no luck.that was 4 months ago.. now its December and still no parts..Stick with Saito and O.S. . Mike Melendy, Blue Max R/C flying Club (Posted on 12/2/13)
most reliable engine Review by tom
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I have about 8 flights only on this Magnum 91 FS but it has never quit in the air or in idle at taxi in or out. This is m ore than I can say for my Saitos and OS 4 cycle engines. I also have 2 Magnum 52 4 cycles and the are the same for starting and for reliabilty. (Posted on 11/29/13)
Crankshaft problems Review by Pilots
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This is my second engine. The crankshaft broke on both after about 75, 10 minute flights.The first time I crashed my plane, the second time i was luckiy because I was still on the bench. the engine runs great but this is a dissappointing flaw. (Posted on 9/26/13)
91 magnum Review by butthole
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nice engine for the money (Posted on 7/25/13)
First Glow Engine Review by x-electric
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My first Magnum .91 would not run very well after break in. It didn't seem to respond to needle valve adjustments and the needle turned very hard. I removed the high speed needle valve and found some debris inside like chunks of o-ring but the o-rings looked fine. Cleaned everything out and then I could get it set up and it ran wonderfully :-). I have owned this engine for over a year now with no problems at all. Starts very easily. I use a starter motor without using the choke (much less messy). So I removed the choke lever as it just gets in the way. I have the engine mounted horizontally in a Great Planes Escapade 60 and have been flying this setup going on the second season now. Starts great, idles great, has plenty of power, and what a bargain! (Posted on 4/30/13)
First one Review by So far so good
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I'm an OS guy but always am looking for a bargain. I have a lot of engines, including OS, YS, Super Tigre, Thunder Tiger, and a couple of mongrels. So far so good with my new Magnum 91. it started slobbering rich following the directions. I couldn't get it to hold on even using the Sullivan on board glow. it finally ran and held on at about 1 1/2 turns open on the main. Break-in was OK. It ran out a couple of tanks and it seems like it will be a strong runner. It even gave me a good smokey idle. The heat being on at high trim helped. Confidence is high,will report back after the maiden and a few other flights. I bought this on sale for $130! Now that's a bargain! (Posted on 1/15/13)

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