GMS Emgines

GMS Emgines

Post by Eyro » Mon, 27 Aug 2001 14:32:33



I just picked up a GMS 76 2 stroke and I was wondering if anyone has used
this and other GMS engines.
Please let  me know your opinions.

EEO

 
 
 

GMS Emgines

Post by j » Mon, 27 Aug 2001 17:24:32


They run great at first, but loose compression pretty fast.  I have
had two .46 engines, and they both lasted about 5 gallons of fuel
each, then they start to run poorly.  They surge then lag in flight,
and no needle fiddling will get it back.  The carbs work ok, but they
are not very precise.  On the .46 the carb does not close enough to
turn the engine off, no big deal, but a poor design.  If the guideway
was a little longer the carb would probably be fine.

On the plus side the engines are cheap ($60 for a .46 with trade in),
and are very powerful.  Both of my gms .46's will outrun a os .46fx.
The os is a little faster with the gms muffler than stock, but still
not as strong as the gms is stock.

I have only had maybe 10 dead sticks on about 10 gallons of fuel, so
they do run well, but once the compression goes they will run very
poor.

All in all a decent motor for the money.

 
 
 

GMS Emgines

Post by Paul McIntos » Mon, 27 Aug 2001 19:05:11


You must be leaning them to peak RPMs if you wore them out that fast.  I
have several years of hard running on mine with no loss of performance.

Also, GMS does not make a .46.

--
Paul McIntosh
Desert Sky Model Aviation
http://fly.mcintoshcentral.com

Quote:
> They run great at first, but loose compression pretty fast.  I have
> had two .46 engines, and they both lasted about 5 gallons of fuel
> each, then they start to run poorly.  They surge then lag in flight,
> and no needle fiddling will get it back.  The carbs work ok, but they
> are not very precise.  On the .46 the carb does not close enough to
> turn the engine off, no big deal, but a poor design.  If the guideway
> was a little longer the carb would probably be fine.

> On the plus side the engines are cheap ($60 for a .46 with trade in),
> and are very powerful.  Both of my gms .46's will outrun a os .46fx.
> The os is a little faster with the gms muffler than stock, but still
> not as strong as the gms is stock.

> I have only had maybe 10 dead sticks on about 10 gallons of fuel, so
> they do run well, but once the compression goes they will run very
> poor.

> All in all a decent motor for the money.

 
 
 

GMS Emgines

Post by Joe L » Mon, 27 Aug 2001 19:42:29


jt,  Where did you buy your .46 MDS engines for $60?  I'd like to give
them a try.
Joe L.

Quote:

> They run great at first, but loose compression pretty fast.  I have
> had two .46 engines, and they both lasted about 5 gallons of fuel
> each, then they start to run poorly.  They surge then lag in flight,
> and no needle fiddling will get it back.  The carbs work ok, but they
> are not very precise.  On the .46 the carb does not close enough to
> turn the engine off, no big deal, but a poor design.  If the guideway
> was a little longer the carb would probably be fine.

> On the plus side the engines are cheap ($60 for a .46 with trade in),
> and are very powerful.  Both of my gms .46's will outrun a os .46fx.
> The os is a little faster with the gms muffler than stock, but still
> not as strong as the gms is stock.

> I have only had maybe 10 dead sticks on about 10 gallons of fuel, so
> they do run well, but once the compression goes they will run very
> poor.

> All in all a decent motor for the money.




 
 
 

GMS Emgines

Post by Tony Di Stefan » Mon, 27 Aug 2001 14:49:35


I have the GMS .61, its almost exactly the same size/weight as the .76.  I
have about a gallon of fuel through it so far and has been a strong runner
so far. I have been told that they get better with more run time.  They're
ringed engines, so it takes a while for it to seat and fully break in.
These engines do like to run rich.  Also, I  had been told on this forum
that the low speed needlve valve side needed to be leaned about 1/2 to 3/4
turn to the lean side from factory setting. (Thanks again to whomever posted
the response to my question. I'm sorry I forgot your name)  I can confirm
this and its definately true in my case.  Before, the engine was "loading
up" after a little while at idle then being run to full.  With the
adjustment, no power lag or surge, with reliable idle.  I think you'll be
pleased with the GMS .76 and its a great bargain for the price.

Happy Flying,

Tony Di Stefano
Cranberry Township, PA


Quote:
> I just picked up a GMS 76 2 stroke and I was wondering if anyone has used
> this and other GMS engines.
> Please let  me know your opinions.

> EEO

 
 
 

GMS Emgines

Post by Paul McIntos » Tue, 28 Aug 2001 01:01:20


That is a trade-in price from Mecoa.  You have to send in a complete,
working engine to get that price.

--
Paul McIntosh
Desert Sky Model Aviation
http://fly.mcintoshcentral.com


Quote:
> jt,  Where did you buy your .46 MDS engines for $60?  I'd like to give
> them a try.
> Joe L.


> > They run great at first, but loose compression pretty fast.  I have
> > had two .46 engines, and they both lasted about 5 gallons of fuel
> > each, then they start to run poorly.  They surge then lag in flight,
> > and no needle fiddling will get it back.  The carbs work ok, but they
> > are not very precise.  On the .46 the carb does not close enough to
> > turn the engine off, no big deal, but a poor design.  If the guideway
> > was a little longer the carb would probably be fine.

> > On the plus side the engines are cheap ($60 for a .46 with trade in),
> > and are very powerful.  Both of my gms .46's will outrun a os .46fx.
> > The os is a little faster with the gms muffler than stock, but still
> > not as strong as the gms is stock.

> > I have only had maybe 10 dead sticks on about 10 gallons of fuel, so
> > they do run well, but once the compression goes they will run very
> > poor.

> > All in all a decent motor for the money.





 
 
 

GMS Emgines

Post by Vance Howar » Tue, 28 Aug 2001 01:57:38


Does any one know what Mecoa does with the engines you send in for trade
ins? Just curious.

Quote:
> That is a trade-in price from Mecoa.  You have to send in a complete,
> working engine to get that price.

> --
> Paul McIntosh
> Desert Sky Model Aviation
> http://fly.mcintoshcentral.com



> > jt,  Where did you buy your .46 MDS engines for $60?  I'd like to give
> > them a try.
> > Joe L.


> > > They run great at first, but loose compression pretty fast.  I have
> > > had two .46 engines, and they both lasted about 5 gallons of fuel
> > > each, then they start to run poorly.  They surge then lag in flight,
> > > and no needle fiddling will get it back.  The carbs work ok, but they
> > > are not very precise.  On the .46 the carb does not close enough to
> > > turn the engine off, no big deal, but a poor design.  If the guideway
> > > was a little longer the carb would probably be fine.

> > > On the plus side the engines are cheap ($60 for a .46 with trade in),
> > > and are very powerful.  Both of my gms .46's will outrun a os .46fx.
> > > The os is a little faster with the gms muffler than stock, but still
> > > not as strong as the gms is stock.

> > > I have only had maybe 10 dead sticks on about 10 gallons of fuel, so
> > > they do run well, but once the compression goes they will run very
> > > poor.

> > > All in all a decent motor for the money.





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GMS Emgines

Post by Tom Ser » Tue, 28 Aug 2001 02:29:17


I hear they melt them down and use the metal to build kalishnikov
copies...  allegedly

On Sun, 26 Aug 2001 16:57:38 GMT, "Vance Howard"

Quote:

>Does any one know what Mecoa does with the engines you send in for trade
>ins? Just curious.


>> That is a trade-in price from Mecoa.  You have to send in a complete,
>> working engine to get that price.

>> --
>> Paul McIntosh
>> Desert Sky Model Aviation
>> http://fly.mcintoshcentral.com



>> > jt,  Where did you buy your .46 MDS engines for $60?  I'd like to give
>> > them a try.
>> > Joe L.


>> > > They run great at first, but loose compression pretty fast.  I have
>> > > had two .46 engines, and they both lasted about 5 gallons of fuel
>> > > each, then they start to run poorly.  They surge then lag in flight,
>> > > and no needle fiddling will get it back.  The carbs work ok, but they
>> > > are not very precise.  On the .46 the carb does not close enough to
>> > > turn the engine off, no big deal, but a poor design.  If the guideway
>> > > was a little longer the carb would probably be fine.

>> > > On the plus side the engines are cheap ($60 for a .46 with trade in),
>> > > and are very powerful.  Both of my gms .46's will outrun a os .46fx.
>> > > The os is a little faster with the gms muffler than stock, but still
>> > > not as strong as the gms is stock.

>> > > I have only had maybe 10 dead sticks on about 10 gallons of fuel, so
>> > > they do run well, but once the compression goes they will run very
>> > > poor.

>> > > All in all a decent motor for the money.




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>Outgoing mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
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GMS Emgines

Post by Rod Robbin » Tue, 28 Aug 2001 06:10:58


<snip>

Quote:
> I think you'll be
> pleased with the GMS .76 and its a great bargain for the price.

> Happy Flying,

> Tony Di Stefano
> Cranberry Township, PA

I have a relatively new GMS .76 and agree with Tony that it's a great value
and a very good, powerful engine.  I've got just over a gallon through mine
and it'll turn a Bolly 12.5x8 at about 11000 rpm on Morgan Cool Power 10%.

The only problem I had was the initial startup out of the box.  I mistakenly
assumed that the factory setting for the lowend needle would be correct.
I'd get it started but it would quickly die over and over again.  After a
number of these false starts, I checked the lowend needle and found it to be
screwed all the way in.

I backed it out one full turn, and it's been running great ever since.  This
setting gives it great low-high transition and a stable, smooth idle down to
about 2300 rpm so far, using the 12.5" prop.

I predict that you're going to like it!

Good luck,
-- Rod

 
 
 

GMS Emgines

Post by Jeff » Tue, 28 Aug 2001 20:01:17


Ive got the trade in price sending them stripped worn out junk...
Quote:

>That is a trade-in price from Mecoa.  You have to send in a complete,
>working engine to get that price.

>--
>Paul McIntosh
>Desert Sky Model Aviation
>http://fly.mcintoshcentral.com



>> jt,  Where did you buy your .46 MDS engines for $60?  I'd like to give
>> them a try.
>> Joe L.


>> > They run great at first, but loose compression pretty fast.  I have
>> > had two .46 engines, and they both lasted about 5 gallons of fuel
>> > each, then they start to run poorly.  They surge then lag in flight,
>> > and no needle fiddling will get it back.  The carbs work ok, but they
>> > are not very precise.  On the .46 the carb does not close enough to
>> > turn the engine off, no big deal, but a poor design.  If the guideway
>> > was a little longer the carb would probably be fine.

>> > On the plus side the engines are cheap ($60 for a .46 with trade in),
>> > and are very powerful.  Both of my gms .46's will outrun a os .46fx.
>> > The os is a little faster with the gms muffler than stock, but still
>> > not as strong as the gms is stock.

>> > I have only had maybe 10 dead sticks on about 10 gallons of fuel, so
>> > they do run well, but once the compression goes they will run very
>> > poor.

>> > All in all a decent motor for the money.