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Hitec RCD ProModeler
HelicopterGasser Model RC HelicoptersOther › carb mod info, don't tell any one about this
Gearhead

rrMaster

Vt

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now every one will know
Nothing more frusturating for the average individual than a 2 cycle engine that will note start or run well.. If you have compression and Spark those two cycles run very well with a bit of Carb work that anyone can do.

99% of Carb problems in our Diagnostics Lab 5 years years ago were traced to bad machining of the flapper valve Aluminum surface. That surface so important to proper flapper valve seating is a rough sanded factory surface comparable to a 180 grit sand job . Just look at those machining marks in there.

Take apart only that flapper valve side of the Carp. Then take and polish that entire Aluminum surface with a 1500 grit Auto polishing paper glued to a flat board .

The flapper valves will it seat properly and 2 cycle engines become easy starters . Many of our test engines starting with one or two pulls 5 years later. Don't be fooled by Carb replacement garble Resurface that Aluminum surface as above and your starting problems will be gone.
site link

http://www.instructables.com/id/How...ine-Carburetor/

Jim
Buzz Buzz Buzz

11-18-2016 06:00 AM
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RM3

Elite Veteran

Killeen, Texas - USA

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the only "flapper" problem I ever experienced was with my toilet...

showing a preference will only get you into trouble, 90% of everything is crap...

11-18-2016 07:43 AM
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jharkin

Senior Heliman

Holliston, MA - USA

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A "flapper" valve?

I wouldn't trust somebody who cant be bothered to read a service manual and learn the real names for the parts of the carb to tell me how to rebuild it.

He is likely referring to the pump diaphagm. If his carb was as poorly machined as he claimed the pump would not draw fuel and it wouldn't run, period. I've never seen one with this "180 grit sanding job" .... wonder if he was buying China knock off's....

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

11-23-2016 05:57 PM
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Gearhead

rrMaster

Vt

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A "flapper" valve?
yee-up, it's on the gasket, you can see it in the video at 2.54 and 2.58, the guy in the video points out the Flappers on the Gasket, he calls them Reed Valves, because they flap back and forth
He is likely referring to the pump diaphagm
no-p, wrong, the opposite side of the carb, he is referring to the gasket between the Carb Block and the Primer Base, on some carbs it will be on the side where the Idle Adjustment Screw is (< like the WT 643),
If his carb was as poorly machined as he claimed the pump would not draw fuel and it wouldn't run, period.
he only claimed the machining to be bad enough to make the engine hard to start
I've never seen one with this "180 grit sanding job"
me nether, the "180 grit sanding job" is not a factory modification
wonder if he was buying China knock off'
could be, the machining on my 643 is very good, even shiny

hold on, in a few I will post another post about another carb Mod

Jim
Buzz Buzz Buzz

11-24-2016 03:45 AM
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don s

Key Veteran

Chesapeake, VA

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The giant scale gasser types have been doing this on DLE carbs for a while now.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

11-24-2016 04:27 AM
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jharkin

Senior Heliman

Holliston, MA - USA

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yee-up, it's on the gasket, you can see it in the video at 2.54 and 2.58, the guy in the video points out the Flappers on the Gasket, he calls them Reed Valves, because they flap back and forth
NO, the text you referred to is from a comment, its not hte guy who posted te video.

The part at 2:54 IS the pump diaphragm! The "flappers" are the two one way valves in the diaphragm. Yea I guess you can call them flappers if you want but that's not the official term in the factory service manual (Ive read it, and I have te 2 stroke tuners guide RM3 mentioned).

They are NOT reed valves either. Reed valves are used on case induction motors between the carb and the case. They are made from a stiff hard plastic. Like a DA, 3W, dirt bike motor, etc. Looks like this:

no-p, wrong, the opposite side of the carb, he is referring to the gasket between the Carb Block and the Primer Base, on some carbs it will be on the side where the Idle Adjustment Screw is (< like the WT 643),
What you call the "primer" is actually an air purge valve. It is usually on the side of the metering diaphragm because it purges all air out of the carb by drawing fuel through the pump chamber and into the metering chamber.

There are usually no flapper valves anywhere associated with the air purge system. It does use one ways but they are typically implemented with tiny spring loaded metal balls that seat into cavities in the plastic purge base.

Read the service manual, this is all explained: http://www.wind-drifter.com/technic...rviceManual.pdf

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

11-24-2016 01:46 PM
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jharkin

Senior Heliman

Holliston, MA - USA

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The giant scale gasser types have been doing this on DLE carbs for a while now.
The mod they do on the DLE carbs has nothing to do with the pump face of the carb. They resurface the reed block (see photo above).

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

11-24-2016 01:53 PM
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Scorpion Power Hitec RCD
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Gearhead

rrMaster

Vt

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the guy used the word "Flapper" as a relative term

Jim
Buzz Buzz Buzz

11-25-2016 05:31 AM
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