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Old 08-13-2019, 05:23 AM
deadrobmusic is offline
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Quote:
Originally Posted by AKNick View Post
grasping for straws, but it would be an easy test to eliminate that fuel system completely. filter restricted? air leak at the fuel inlet? strait line into your gas filler tank would do that.

Still grasping for straws, but those gaskets are important where the carb and reed blocks mount onto. An air leak will make you chase your tail.

I know they are bullet proof... but have you bypassed the TechAero? Voltage regulator pin/plug fall off?

How is your compression anyhow? Turn over smooth? Verified piston movement or slop? Grasping sippy cup straws now ha ha!
Thanks for the help! There is no filter in the gas line. It's a straight piece of tubing. I changed the carb and the reed block and the gaskets. No change...

I bypassed the tech aero.

Compression and motor feels normal
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Old 08-13-2019, 06:13 AM
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Just send it to DA
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Old 08-13-2019, 06:54 AM
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+1 Sounds like an easy check.


Still haven't changed carb/reed block gaskets?
Or try a different tank setup?

Yep just remove the header bolts slide the header to one side and plug your ears.You will know in a second if it goes past 3500 rpm's.
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Old 08-13-2019, 07:25 AM
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sheared woodruff key perhaps?


a bad ignition sensor, sparkplug cap or the ignition unit.
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Old 08-13-2019, 07:32 AM
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Originally Posted by Bill Vargas View Post
sheared woodruff key perhaps?


a bad ignition sensor, sparkplug cap or the ignition unit.

^^^ I agree. To the OP, did you completely change the battery for one that is known good. A battery compromised by dropping on hard floor- etc can have a short only at certain harmonics.
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Old 08-13-2019, 09:34 AM
deadrobmusic is offline
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Originally Posted by WrongWayRC View Post
^^^ I agree. To the OP, did you completely change the battery for one that is known good. A battery compromised by dropping on hard floor- etc can have a short only at certain harmonics.
I changed the ignition, the ignition sensor, the plug cap and wire (it goes with ignition). I changed to a new battery. I got rid of the IBEC and plugged a known good battery direct to the ignition.

I am now down to removing the pipe to see if there is an obstruction.

I am not aware that DA motors have a Woodruff key?
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Old 08-13-2019, 10:14 AM
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Removed the header and she spun right up. Looked and blew in header to fin not obstruction. Looked in pipe to see no obstruction. Maybe there is an obstruction inside the stinger?

I pushed a small piece of CF rod up in there and it eventually stopped. I need to take the thing out to see clearly.
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Old 08-13-2019, 10:24 AM
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Listening to that video again on a computer instead of my phone I can hear it gurgling out of the carb. If timing is verified as good it either has bad reeds or a plugged exhaust causing crankcase gases to backflow. Severe piston damage can do this but starting would be a pain and compression would notably suck. But... a peak at the lower piston skirt would be worth a look now that I thought about that. Reeds should still prevent this... Pull the exhaust first, though.


Whoops.. I see ya done found it... Cool!
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Old 08-13-2019, 11:25 AM
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Quote:
Originally Posted by deadrobmusic View Post
Removed the header and she spun right up. Looked and blew in header to fin not obstruction. Looked in pipe to see no obstruction. Maybe there is an obstruction inside the stinger?

I pushed a small piece of CF rod up in there and it eventually stopped. I need to take the thing out to see clearly.
Pipe is full of shat, probably why you were seeing heat issues as well. What oil are you using? Certain oils can lead to lots of carbon build up.
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Old 08-13-2019, 02:18 PM
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Quote:
Originally Posted by deadrobmusic View Post
Removed the header and she spun right up. Looked and blew in header to fin not obstruction. Looked in pipe to see no obstruction. Maybe there is an obstruction inside the stinger?

I pushed a small piece of CF rod up in there and it eventually stopped. I need to take the thing out to see clearly.

There are baffles inside you will never get a straight piece to go the entire distance.Carbon fiber is heat sensitive sooner or latter it fails as a tuned pipe.As I found and now you did too.Thier are some good aluminum pipes now available that aren't so sensitive to header length.
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Old 08-13-2019, 06:15 PM
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Quote:
Originally Posted by deadrobmusic View Post
Removed the header and she spun right up. Looked and blew in header to fin not obstruction. Looked in pipe to see no obstruction. Maybe there is an obstruction inside the stinger?

I pushed a small piece of CF rod up in there and it eventually stopped. I need to take the thing out to see clearly.

Glad to hear you finally found it! Phew!
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Old 08-13-2019, 06:37 PM
deadrobmusic is offline
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Originally Posted by 3D Wiley View Post
Pipe is full of shat, probably why you were seeing heat issues as well. What oil are you using? Certain oils can lead to lots of carbon build up.
Red Line.... Good? Bad?

So you're saying this pipe is ready for the trash can? It has only got like 8 flights on it total!

Also, I was not seeing heat issues. I just ASSUMED I had heat issues when the motor went from wide open to idle in 2 seconds flat.

I now believe something came loose on the inside of the pipe and plugged it up. Like I said, it was running like a champ. pulled to an up line. As I leveled off at the top the motor went from wide open to idle just like that....
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Old 08-13-2019, 06:48 PM
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Originally Posted by deadrobmusic View Post
Red Line.... Good? Bad?

So you're saying this pipe is ready for the trash can? It has only got like 8 flights on it total!

Also, I was not seeing heat issues. I just ASSUMED I had heat issues when the motor went from wide open to idle in 2 seconds flat.

I now believe something came loose on the inside of the pipe and plugged it up. Like I said, it was running like a champ. pulled to an up line. As I leveled off at the top the motor went from wide open to idle just like that....
Redline is good. 8 Flights total and the pipe was brand new? Definitely something failed inside it. Guy that makes them is tied up in the Jeti group right now digging himself a hole. Not sure if he warranties them or not. I have two of those but only used them briefly and without issues.
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Old 08-13-2019, 07:21 PM
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Yep the pipe is history.You can contact Ed and ask about a repair or warranty and see what he says.If your still thinking pipe take a look at Pro Flow or RC Canada they both have some good pipes and similar in performance.
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Old 08-13-2019, 08:03 PM
deadrobmusic is offline
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Well that blows. A lot of money for 8 flights!

It was brand new, but I bought it from a third party
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