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Old 08-25-2007, 07:08 PM   #11
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As an instructor I have flown several GMS 47's on trainer type planes and they ran very strong. I have a GMS 76 that is several years old on a GP Extra 300 and it has over 200 flights on it. I rarely have to use an electric starter on it, most of the time I prime it and back flip the spinner and 80% of the time away it goes with no further prompting. I would buy another 76 in a second. Guess I have been very lucky to have positive experiences with GMS.

That being said it is hard to beat OS. For long term use and reliability OS is worth the extra dollars.

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Old 09-10-2007, 12:12 AM   #12
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Old 09-10-2007, 07:26 AM   #13
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GMS Engines


I have several GMS engines and they must be set up properly. Typically the low end throttle adjustment is very sensitive and can only be moved slightly until you get it adjusted properly - it may take time. I have several GMS 47's that experienced modellers had, and would always quit shortly after take off. In all cases the low end was set slightly too lean, or the carburettor input hole was slightly off (there is a thread here someplace with the information on adjustment and aligning/drilling the hole).

The 76's I have work great right out of the box, and they are lighter than the 61's.

I have to say that I am very pleased with the GMS's, the power and with the price.

Hope this helps.


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Old 11-14-2007, 10:14 AM   #14
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How good are GMS engines?

I hade a 76 on a 60 size stick and it appered to outperform the os 91 on the same plane.
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