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Old 08-18-2007, 10:44 AM   #1
Dan Bray
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GMS Engine

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How good are GMS engines? I am contemplating the purchase of a GMS61.
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Old 08-18-2007, 11:21 AM   #2
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Don't have a whole lot of experience, but I am very happy with my GMS .47 which I bought NIB from these forums. Easy start, lots of power.
The imagination is the dark-room in which all fears are developed.
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Old 08-18-2007, 01:48 PM   #3
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I have had and still have many GMS engines. My first was a 47 and it still runs awesome. They have loads of power and allways runs perfect. I had a 76 ringed that sat with afterrun oil and had not run for 4 years. It started right away and ran perfect. They idle great and have plenty of power at top end. I still have 3 of the 47's. One is on a trainer that gives it unbelievable power, one on my Magic 3D that allows the plane to do anything. I have one waiting to go on my Giles, that is not finished.
The 76 was on my Sig Hog Bipe and it allowed the plane to do anything it was capable of.
So, my experience is and has been great!!

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Old 08-18-2007, 02:30 PM   #4
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That's what I like to hear. Thanks guys.
Semper ubi sub ubi
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Old 08-19-2007, 11:45 AM   #5
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GMS .40 Big Ugg

There are two of us in our club with GMS .40's and they both quit after a few minutes of running. Mine waq carefully broken in, I have been running 2cycl engines for over 60 years.
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Old 08-19-2007, 12:40 PM   #6
Dan Bray
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I knew there had to be some bad news. 1 in our club has a GMS with no problems. Undecided. Maybe I should stick with the tried and true OS. Thanks.
Semper ubi sub ubi
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Old 08-19-2007, 01:44 PM   #7
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You can get good and bad in any make. I have 3 GMS', a.47, .61 and a .76. My brother has a .47 and a .76. All run great. Had one dead stick with my .47 and that is all. I also have 3 os .46s' and have had a couple deadsticks with them also. Every deadstick was due to a tuning error on my part. I think all the new motors are pretty good so it is down to personal preferance. For the money GMS motors are proving to be a good buy but you can still get a dud in any brand.


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Old 08-19-2007, 03:34 PM   #8
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I think the .61 & .76 are close in weight?..i would go with the .76!! I owned one on a sig 4* 60 ran great!! and for the price it's hard to beat!..but i guess after it hit the ground (BEYOND REPAIR) i've only purchased O.S......? And have had good luck with them as well!!

hope this helps!

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Old 08-20-2007, 12:06 AM   #9
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I had one of the original 47's (don't know if they are still the same..) and it was an awesome engine. It did need some time on the ground to break in, but after that, it was the easiest starting engine I have ever owned (and I am an OS and Saito guy....).

The only thing that I have noticed recently is that our club has sound rules, and the GMS's are the only brand that will not meet our standards with their stock mufflers...they are a bit too noisy...
There aren't enough days in the weekend. -- Steven Wright
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Old 08-25-2007, 04:24 PM   #10
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GMS engines are excellent, tons of power and very good quality for a low dollar. The only thing I hate about the engines is the throttle arm assembly, I've had two of them come apart in mid flight. The arm is made of 2 pieces pressed/soldered together. I remedied this with using MDS or O.S. throttle arms..... they need to be slightly modified but they are a 1 piece billet aluminium unit so it totally takes care of the issue. The engines start very easily by hand and run very reliably, and like I said.... the power is unbelievable. My GMS.76 can spin a MA 13x8 1600rpm faster than my ST G-90, and a MA 14x6 900rpm faster!
Jay Dickson
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