ORIGINAL: shd3920
ORIGINAL: opjose
Once you get the GMS running right, you'll love it.
It's a strong reliable engine, but there are a few things you need to be aware of...
e.g.
- The cap screws WILL come loose after the first few runs. They'll need tightening.
- You need to be careful with those cardboard "rings" they use on the fittings, these will cause the fitting to loosen or leak over time. Check them periodically and be careful NOT to overtighten as they are quite easy to strip.
- If you have the remote high speed needle, check it too for looseness, and watch for a hairline crack on the provided HS to carb line... I'd replace it ASAP with other tubing.
- Make sure you clamp the carb DOWN hard when you screw it in place to form a good seal.
- If running inverted, a longer "F" plug is a good idea.
- Try to get a temperature meter and watch the head temp. You'll have the engine adecuately tuned if it hits around 280F or so on the ground uncovered, but does NOT go to say 380-400F which is too hot.
- The engine doesn't really come into it's own until you've run a couple of gallons through it.
- Keep your first flights around 5 minutes as typically you'll have the engine so rich that it will run out of fuel VERY quickly. It may surprise you how fast it uses fuel until it is tuned well. Once tuned it does well with fuel consumption.
Sounds like a bit of work to simply get flying. I think it would be best to trade the engine in or otherwise get rid of it and get something simplier to run, like an O.S or another Super Tigre
All engines are going to require some type of break-in procedure. No matter what brand of engine you use you just can't pull it out of the box and expect it to be ready to fly. Even OS engines require a break-in before you run it. There is nothing wrong with the GMS engine that you have if you follow the advice given here. Of course you are free to do whatever you want to, but getting rid of this engine and ordering another one sure seems like a lot of work when the fix to your problem with the GMS is so simple. What you have to do to break-in the GMS isn't hard to do, and once you have it broken in properly you will be rewarded wtih a good running engine.
Ken