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Old 08-11-2019, 06:08 PM
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Quote:
Originally Posted by Dan767 View Post
Where the reeds ok?

Dan
They seemed fine to me, but two of them did not close down 110%. there was a very slight opening on them, so I replaced them.

No change
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Old 08-11-2019, 07:05 PM
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Let that be a lesson. They do not need to close completely to be 100% functional on ANY reed valved engine. All the internet "experts" that say otherwise are clueless.
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Old 08-11-2019, 07:12 PM
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Quote:
Originally Posted by deadrobmusic View Post
They seemed fine to me, but two of them did not close down 110%. there was a very slight opening on them, so I replaced them.

No change
Hmmm so you've swapped IGN, FUEL, and BATTERIES.

What did you replace on the carb? Screen & plunger too? partial blockage maybe? Fuel Filter type? Did you try running from a separate tank yet or just run a line into your fuel filler tank.

Hall sensor seems like it's picking up it's target just fine.

Carb seems to be squished on there pretty tight from what I can see. Have you changed the carb mounting/reedblock gaskets yet? No idea how old they are, but an air leak there would make the carb pretty ineffective.

Try a new plug out, could very well be a cracked porcelain/insulation that gave up. This would get worse as the engine heated up and while under a load.

What's left after that!? New Carb?!? Send to DA?? Ha ha!!
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Old 08-11-2019, 08:54 PM
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I swapped out the carb with one that I know is good tonight. Will try it tomorrow and see how it works. If that don't fix it then it HAS to be the hall sensor I reckon.
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Old 08-11-2019, 09:11 PM
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Is the the throttle arm actually moving the butterfly
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Old 08-11-2019, 09:32 PM
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Hall sensors can fail in a mode where they simply will not cycle beyond a given frequency/rpm.

Components in some mufflers and couplers can come loose and cause similar problems.
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Old 08-12-2019, 08:48 AM
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Quote:
Originally Posted by RTK View Post
Is the the throttle arm actually moving the butterfly
YES
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Old 08-12-2019, 09:02 AM
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Just tested different carburetor. Nadda....

So Hall Sensor or Exhaust? I can not see any issue with the exhaust. Coupler is in tact....

Hall sensor change next
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Old 08-12-2019, 09:46 AM
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Quote:
Originally Posted by deadrobmusic View Post
Just tested different carburetor. Nadda....

So Hall Sensor or Exhaust? I can not see any issue with the exhaust. Coupler is in tact....

Hall sensor change next
Your DA doesn’t have a Hall sensor. It is simply a coil of wire but serves the same purpose. They still can go bad.

By the way, if plugged in backwards, the engine will still run and sound almost as bad as the engine in your video.
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Old 08-12-2019, 03:00 PM
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Here is a thought I once was into tuned pipes. I had a ES Carbon fiber pipe that something came loose on the inside,you could hear it rattling around.At the same time I lost almost a 1000 rpm's.
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Old 08-12-2019, 06:33 PM
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OK, I have checked the gas tank and tubing. Changed the Plug, ignition, ignition sensor, and carburetor. I also used. A123 battery direct to the ignition. Nothing else to look at but the motor????


Or maybe it is the ES pipe? I no hear anything loose in there???
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Old 08-12-2019, 07:30 PM
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Maybe just take it off and run, check for sure, process of elimination.I just watch your video and it sure does sound like the engine is being choked down if that makes any sense.
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Old 08-12-2019, 08:29 PM
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Originally Posted by closetguy View Post
Maybe just take it off and run, check for sure, process of elimination.I just watch your video and it sure does sound like the engine is being choked down if that makes any sense.


+1 Sounds like an easy check.


Still haven't changed carb/reed block gaskets?
Or try a different tank setup?
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Old 08-12-2019, 08:36 PM
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+1 Sounds like an easy check.


Still haven't changed carb/reed block gaskets?
Or try a different tank setup?
I swapped out the entire carburetor, including the reed valves....

Different tank? no, but I took this on out and checked for air leaks. It is rock solid. Draws fuel just fine.
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Old 08-12-2019, 09:19 PM
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Quote:
Originally Posted by deadrobmusic View Post
I swapped out the entire carburetor, including the reed valves....

Different tank? no, but I took this on out and checked for air leaks. It is rock solid. Draws fuel just fine.
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!
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