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Old 09-29-2003, 07:13 PM   #1
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GMS engines

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There have been a number of posts about GMS engines not shutting off at full off throttle. Lots of air leaks it seems. Was thinking of buying one but am a bit cautious. Have these problems been solved with the latest batch of engines sold? I know of all the fixes, just want to avoid the necessity of fixing an engine fresh out of the box.
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Old 09-29-2003, 07:20 PM   #2
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I wouldn't be to upset if my engine didn't shut off at full throtle . Now when I closed the carb to kill the engine and it kept running I might get a bit annoyed . I read about this problem but it only occurs on some of the engines. An easy fix is to replace the carb if your engine has this problem. I heard one of the OS carbs is a good fit but I can't remember which one. I haven't owned one of these engines and only know of one person with one but he was happy with the engine when he put the OS carb on it.

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Old 09-29-2003, 07:48 PM   #3
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Well, I did say full OFF throttle. But, that might have been easy to miss, worded badly obviously. You say an easy fix is to install another throttle? Well, that's kind of what I'm trying to avoid,,, either an easy but expensive fix or a cheap fix that's mickey mouse. Somehow, it seems to me that you shouldn't have to fix something that you just bought brand new.

I've been told that they're real snorting powerhouses and well made but was hoping to avoid problems with the carb at the outset.
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Old 09-29-2003, 07:49 PM   #4
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I have 2 of the .47's. Only one does not like to shut off. Alot of power though!
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Old 09-29-2003, 07:57 PM   #5
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I have a friend (you out there Divit??) who has a 47 gms and it doesn't want to shut off either. He's done some research and found it is the front bearing. Somthing about rtv sealent to fix this problem. Not to sure,, but if you want my 2 cents, buy an OS four stroke!!
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Old 09-29-2003, 08:05 PM   #6
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I'd agree with you except that it's a question of money. That's why I'm even considering the GMS. I know it's Chinese and political correctness aside, it's the least expensive engine out there that is supposed to be well made and deliver exceptional power.

It appears that I'll just have to take my chances. Hopefully it's not a bearing issue.
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Old 09-29-2003, 08:06 PM   #7
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The fix on the 2 in our club was in the bolt that holds the carb in place. Most of the engines have the bolt in so that when you tighten the bolt it lifts the carb off of the o ring and it leaks air and won't shut off. Simply remove the bolt and insert it from the other side and it should cure the problem.

As a note the engine is a reliable, easy starting, good power engine but it seems to lack the fuel draw capabilities of an OS or other brand name engine .It is possible to starve out the engine in high g manuevers . I found I had to set mine on the verge of being rich on the ground to minimize this in the air. It would be great on a trainer scale etc but on an extreme fun fly type I would go to a better brand of engine.

Just my 2 cents
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Old 09-29-2003, 08:34 PM   #8
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Whats the difference in price between a GMS 47 and a Thunder Tiger 46 Pro?

I always thought for the money a thunder tiger was an excellent buy! I've never heard of these kinds of problem with the TT pro.
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Old 09-29-2003, 08:57 PM   #9
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The GMS has appeal because from Mecoa, they'll give you a 20 dollar rebate if you send in an old engine. Yes, take off 5 to 7 bucks for shipping but every little bit helps.

Well, R Plante. That's good news if the fix is that simple. Many thanks. I've read about smearing a layer of silicone over everything, or so it seems. Also, thanks for the tips. I've read that the barrel has an unusually large bore so that may be the issue there.
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Old 10-01-2003, 12:51 PM   #10
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Just spend the extra dollars for the TT46 Pro you won't be sorry.

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