Hi Dave,
My 140DZ flies flawlessly on the first flight of the day.
Then on the second flight it will run for 3 minutes then dead stick after a short low throttle coming out of a loop or any other procedure were you would use low throttle management.
It has a large plume of smoke all through the throttle range.
Starts are relatively easy.
I was thinking maybe it is to rich on the regulator.
APC 16-10 at 8700rpm 20% oil coolpower (10%lv&10%normal) 15% nitro OS F type plug.

any ideas before i start screwing around.

PS it now has a brand new carby after an accident the other week. It had the same characteristics before the accident.

Regards Lawrie

Also Dave i have a 18-8 APC on order for it to try and slow it down a touch

I can't imagine why it runs fine on the first flight then problems later.

It could be too rich overall, but I'd add nitro. 15% is really not adequate.

Thougt i would include some pics
CMpro/GSP Extra 300s 140 size
6.1kg 13.4pounds
fast and smooth good match for this engine

Will give it a go.
I will batch some 20% nitro for next week also try a new plug. Then try to lean the regulator a touch.


Thanks for your help Dave

Since it's a DZ, it is not a regulator, but a pump. It could be a part of the problem, as some of the 140DZ pumps didn't function just right.

HOw do you tell if the pump isn;t operating properly??

I have the same plane /engine combo as above. I purchased it for 500 bucks plane and YS140DZ , because the motor was quitting during areobatics and deadstick landings damaged the gear/fuse .

When the motor ran , it ran well, but sudden stops...the previous owner ran it on a 16x4 at 10,500 for 1 flight before he someone toldhim that was too much RPM. He didn;t use full throttle , just enogh to fly it. But it even deadsticked then. He went to a 17x10 and it deadsticked and damage.

I am reluctant to rebuild the bottom of this plane and just TRY the motor without knowing what is going on.....

Should I Static test it on a bench ....and try the tuning steps again, or just send it in?? Sound like a mechanical problem in the motor??

It was run at HS 2 turns to 1 1/12 turns.

I got it cheap , and I know that when it is right it will stay right. My 1.10FZ is fine after getting it back from service.

Can;t wait to fly this combo.

I'd send it.

Hi Dave,

Flown the plane today screwed the pump out 1/8 turn anti clockwise and made up 30%nitro 20% coolpower half LV and Half standard.
After using the new fuel the trim was not low enough to shut of the engine sat there idling at 1200 rpm for a minute or so and still picked back up to full throttle.
eventualy it did stop.
Topend i set full throttle peaked the engine at 8800 then richen it up to 8500 with a 18x8 APC.
vertical was unlimited with a 6.1kg plane behind it i think thats about 13.5 ponds it just kept going up until you could not see it.
the engine now runs flawlessley all flights easy to start.


Thanks for your help


Lawrie

Good to hear.


Have fun!