burnig up plugs OS 50

[choppaholic]

hi guys need some help.

have been burning up plugs.

have had 6 flights till now on this engine, as far as i can tell the engine sounds sweet has it tuned by a club member at Purfleet heli club. he did say he set it a tad rich.

now on normal flying i have had no problems so far for 4 tanks, on my 5-6 went idle up lost 2 plugs. both times did a dozen flips and held it inverted no more than 5 seconds, soon after flipping idle up the engine would slowly rev up to it max speed and then after flips and inverted i notice the smoke start to reduce and sound would change (so i guess it leaning out), but then even when i flipped it back to normal it would still lean and cut out in mid air, after 2 safe autos i am bask home.

i read a few post which suggested bearing issues but why fine in normal mode?

both time the plugs have completely lost the glow element. there is no wire left at all.

the engine is seconds hand the seller said he has done 9 tanks on it and as far as i can tell/club member makes loads of power and run sweet.

there is no header tank, and the idle up curve is 100 90 80 90 100 then i changed it to 80 flat to see if that would help but still burnt the plug.

any suggestions please before i get the engine out!

[J-S-Q]

I don't know what others reckon but 100,80,100 sounds like a pretty high mid point for the throttle curve? Not sure if that's got anything to do with it necessarily. What's your normal curve?

[karladam1234]

Get the engine out and get the head off and check to see if there is any glow eliments in it ect... or as with mine it was the rear bearing... Easy job to do, plenty of threads on how too do it.... I went though 4 in a week and decided there was something wrong... Hope this helps cheers

[Geek]

Sounds like its over reving if the curve is that high
mine is at 60 in the middle and that would over rev with out the governor ( must get round to sorting that just incase )
How is it to start?
is it flooding before it starts?

[Mike W]

wonder what headspeed it's running with those throttle settings ...

[J-S-Q]

I used to run 100,75,50,75,100 and when I started using a governor it actually brought the headspeed down a little.

[Sesame]

Have you checked out the tubing to make sure theres no holes in the clunk sending it lean.

Only other thing I can think of right now is maybe the bearings packing in. small pieces of metal from the bearing gets in the glow and kills it.

[choppaholic]

I don't know what others reckon but 100,80,100 sounds like a pretty high mid point for the throttle curve? Not sure if that's got anything to do with it necessarily. What's your normal curve?

Hi mate,
your bird is very sweet flies beautifully thank you for this.

Now i need to sort the engine out.

the normal curve is 0 17 40 66 100.

i am not running a governor if that can help to figure out whats happening.

[J-S-Q]

Glad it's running nicely! Well like I said above, 100,75,50,75,100 is probably more like it. I'm definitely not a nitro expert or anything but hopefully others will chip in. If it's only happening in Idle up and your Idle up curve is way higher than the normal curve then this would seem to be a likely cause of the problem.

[Mike W]

rough idle up curve for a hyper .. this is as a baseline and depends on servo and linkage settings ..... 100, 63,48,63,100 .... you either need to get a gov on it or tacho it to make sure .... strip the engine and clean it all out .. change the rear bearing and then try again.... change fuel lines as well just to be on the safe side

[choppaholic]

wow i blink an eye and there are loads of replies, thank guys.

to answer some questions.

yes a few of my start are flooded due to me forgetting a few things like clip the fuel line.

if i get it right it starts first time.

how does a fuel line effect, is it the filter that needs changing?

sesame; what is clunk?

sorry guys i am new to Nitros.

[Jamin_00]

Could be the tank itself??

[Geek]

Think there is a few things to do
It's over reving
might need the fuel line changing in the tank ( the clunk ) that's the think you hear when moving the heli around clunk clunk

I would get a governor for christmas

[J-S-Q]

What makes you suggest the tank?? This was my heli until a couple of weeks ago btw and I never had a plug burn out on me although it has a different engine in it now.

[Geek]

AAAAAAAAh
Check the clunk when inverted see if it's touching the tank and bloking the hole so leaning it out killing the plug and stoping the engine