Are these engines any good? They are priced well.
Thanks

Had one and lost it on the second flight of the day. I didn't have it long enough to have a good or bad experience. I did notice that after doing the breakin procedure at home and then going out to fly the next day it was very hard to get a low idle. Some of the guys at the field said that it takes a few tanks of fuel before they will idle very well. Just my short experience.
chopper man

i have had a gms 61 and now have a gms 76.
for the money you cant beat the horsepower you get out of these engines.
its all in the break in. this engine is not very reliable untill its broken in.
and i mean about a gallon of fuel.

also the low end needle on mine was way off.and very senitive.
they also run better with the stock muff too.
once you get past the breakin you ll have a cheap power house that ll swing a 15 in prop no prob.

All I can say is that I have six (6) of them in various sizes and love them all ! I am currently breaking in my third GMS.47 for my new Decathlon! MUCHO POWER !

Ugo

I only own the .40, but it absolutely screams. Easy to start, and nice reliable idle-once broken in. It spins a MA 10/6 at well over 15K on PowerMaster 10/22 fuel.
Best of all they are DIRT CHEAP. Wait for a $20 off $50 coupon from Tower and you have a $40 engine that is hard to beat.

I own engines from O.S., Saito, Thunder Tiger, Super Tiger, Magnum, and GMS. My GMS .47 took a little longer to break in than my other ABC 2-strokes, but was very reliable, powerful, and smooth-transitioning. I would buy another GMS based on my experiences so far.

at around a $100 US G M S 60 the best buy I,ve had for a long time nosed trainer in at full throttle one flick and it was away again and it idles real sweet the secret is the break in I feel, would highly recommend to any and everyone and they look nice with that gold anodized head

Yes, great engines.

GMS also makes the Tower Hobbies engines too.

I find that they only settle down after 4-5 tank fulls of fuel.

Then the engine will idle reliably and very slowly.

The GMS produce gobs of power, one reason the TH .75's are so popular.

I have three GMS engines; a .32 on an LT-25, a .40 on a TH Kaos and a .76 on a 4*60.

They have been excellent engines for me.

I have, however, replaced the glow plug that came with the engines with OS A3's.

I use 10% nitro fuel.

The engines have been reliable and powerful.

Price right too.

Dave

I have a GMS 1.20 it stops running when I back down on the throttle in flight. I changed the lines any Ideas?

somebody at the field has one, he loves it and man does that thing scream

At higher speeds the pressure from the muffler increases the fuel flow into the carb.

As you back off, that pressure remains.

If your low speed needle is too rich, the engine can shut off as the glow plug cannot overcome the cooling effect of all of the fuel.

Conversely if the mixture is too lean as you back off, the engine can stall out for lack of fuel.

Forgot to mention the availabity of parts thru Tower !! Cheap shipping too !
Ugo

My club has been using OS Max LA .40 's for our pylon races but they have been discontinued. We have been looking into the GMS .40 ABC . We would like to have something similar to the O.S we were using. Any comments?

The OS LA .40's are about the equivalent of a GMS .32 engine ( or less ) in terms of power.

If you switch to the GMS .40 ABC's you find that the guys flying these will have far more power and speed than those flying the LA .40's.

Wonderful engines. Leave the needles as they come. Run them at varying throttles for a couple of tanks, tune a bit, another tank, tune more, retighten the cap screws and make sure everything is tight then fly.

Note the warnings about tightening the muffler screw when the muffler is warm, or else the exhaust will rotate in flight.

I know this the gms engine has pressure problem

Says who?

I've run plenty of Tower and GMS engines.

As long as they are set up properly and the carb is properly installed there is no "pressure problem".

The folks at http://www.mecoa.com are closing out their remaining GMS engine inventory right now, and they have some pretty good deals. You can buy 3 of the GMS .47 engines for $169.99 after coupon code (GMS2007). You can buy 2 of the GMS 1.20 engines for $189.99 after coupon code. They also have a deal where you can get a GMS .40, a GMS .47, and a GMS 1.20 all for $189.99.

My experience with the GMS .47 was very positive, and I wouldn't hesitate to buy another one of these engines for the right project.