Strange 50R throttle problem

[LimeyTom]

Hi
Ive been flying with a DA50R in my EF Extra 300 since august.
From day one its been a fantastic engine, starts every time, ticks over perfectly and the pickup on the ground is fine. hits 7000rpm with a mejzlik 23x8 and CF tuned pipe.

Only problem ive had from the start is.
When im flying it in generally stalled attitudes, and i suddenly flip it from say upright to inverted, and ive had it when i snap from higher speed flight into a high alpha KE, the engine kinda coughs, or struggles to pick up. It doesnt last for long, but long enough for me to ***** myself when im doing low down stuff !!

the carb has been flipped over but i have a feeling from ones ive seen and in the image here
http://www.desertaircraft.com/images...lid_bottom.jpg

it must have been the other way out the box.

Any ideas?

i want confidence in my engine !!
ive tried the low end tuning but it seems to make no odds ???

Thanks!

[Fearless Flyer]

I had the same thing with my DA in a AW 29% Katana. During flight, the engine would have a very noticeable lag going from level flight to high alpha knife edge.
I was running the same prop...Mej.23x8
I switched to a PT Models 23x8 and there was a big difference for the better. It spooled up better and also I didn't have that very noticeable lag transitioning into high alpha or 3D maneuvers.
Hope this helps.....

[whiteknuckleairlines]

	Quote: Originally Posted by tomg
	Hi Ive been flying with a DA50R in my EF Extra 300 since august. From day one its been a fantastic engine, starts every time, ticks over perfectly and the pickup on the ground is fine. hits 7000rpm with a mejzlik 23x8 and CF tuned pipe. Only problem ive had from the start is. When im flying it in generally stalled attitudes, and i suddenly flip it from say upright to inverted, and ive had it when i snap from higher speed flight into a high alpha KE, the engine kinda coughs, or struggles to pick up. It doesnt last for long, but long enough for me to ***** myself when im doing low down stuff !! the carb has been flipped over but i have a feeling from ones ive seen and in the image here http://www.desertaircraft.com/images...lid_bottom.jpg it must have been the other way out the box. Any ideas? i want confidence in my engine !! ive tried the low end tuning but it seems to make no odds ??? Thanks!

There have been a couple threads saying that when you flip the carb you shouldnt flip the black block that it is attached to, only the carb.

at any rate - call DA thats what they are there for! they will get you fixed up

A couple people called DA and they confirmed, the nipple on the block should always point toward the spark plug.

[LimeyTom]

The block is where it should be in that case thanks for that.
I think i may have the problem sorted but ill find out at the weekend.

Changing fuel lines to be sure.

I have a feeling the choke and thhrottle was pinching the fuel line as i throttle up as it was in a rather strange place as it passed this area before getting attached to the nipple.