Engine cutting out every flight? any ideas

[Supercaptaincrash]

Ive recently been having trouble with my 50 hyper cutting out mid flight, and its always at a similar point! i can fly round doing circuits,rolls and flips without a problem but if do a fast inverted climbout and roll or flip the heli back the right way up the engine has been instantly cutting out??,the only change i have done with this engine recently is alter the needles a couple of clicks for the cold mornings! any ideas folks

[tonystevens]

After youve checked all your fuel lines, clunk. filter etc...go back to factory settings and start again Andy.

[tourerjim]

I had same symptoms turn out to be the pipe in the tank had a very fine spit just at the point where it fits tank union

[Supercaptaincrash]

all fuel lines replaced around 10 flights ago ! only thing i did which i really shouldnt of is i used standard fuel line for the clunks,but it still moves around the tank so cant see that being the problem

[jwatts007]

My 600 fitted with a OS 55 is doing the same when a turn the heli upsaide down the engine note changes or it stops, got to change all the fuel pipes, tighten the exhaust and check the niple clear and tight, if that fails get a YS 60.....

[checkoutmybull****]

Have you tried fitting a new glow plug? If so, try another one. Have you got a header tank?
If so, is the header's outlet level with the carb's inlet?

Clean out any fuel filter, or crap trap. Don't use a bubbless clunk.

Just a few ideas.

M

[tonystevens]

all fuel lines replaced around 10 flights ago ! only thing i did which i really shouldnt of is i used standard fuel line for the clunks,but it still moves around the tank so cant see that being the problem

Check em anyway alot can happen in ten flights and put some proper clunk line on too, you need to make sure every thing is bob on mate.

[coolice]

Hey.

You might also be running a bit lean around the mid range area, which you are hitting in the flip over. Does the smoke dissappear just before it stops and are you using a govenor?
I would imagine that you are and the reason I ask is that as you flip over and the load on the head decreases, the govenor will lower the throttle to compensate. By doing this the carb is then brought back into/through the lean area of carboration and the engine cuts. Definetly the Hypers like to run a richer bottom end needle, to the point of almost stopping if left idling for too long, to get over the lean point in the mid range. As there is no mid range needle on the Hyper 50, you need to run the idle richer to effect the mid point.

We had a similar problem in the club last summer with WaveyDaveys new OS55 cutting out in pretty much the same scenario. I suggested to richen up the mid range and it went away, but it was easier on a 3 needle carb

Fuel lines can have small pin prick holes in them from new, so if the above doesn't help I would change the lines again. Also check the bore of the tubing used, thin walled tubing can be sucked inwards with high fuel rate demands. Also your thicker tubing could be kinking as the clunk moves about in the fuel tank, rather than loosley following the tank of fuel as it rolls around.
.

[Rotormotor]

That is also a symptom of the rear bearing starting to go. As parts of it start to come away, they get up into the cylinder and damage the glow plug.

Check your glow plug, comparing it to a new one, to see if the coil is deformed in any way

[Supercaptaincrash]

Oh great ! only just changed one on my 55 ! will take a look tomorrow ,thanks for that as i wouldnt of thought about the bearing breaking up as i havent heard anything alarming engine wise!

[Rotormotor]

Sometimes, as the rear bearings in an engine start to go, the first sign will be such flame-outs, then bearing noise, then glow plug failures and then a catastrophic engine failure.

Another cause is if you use a sealer between the muffler and the engine, pieces of it can start breaking away on the inside of the manifold and get ingested into the cylinder. When this contaminant hits the glow plug it will cause the engine to quit.