FCR missing parts

husabutt · Feb 24, 2007

I borrowed a picture from Joe USA's gallery which shows the left side of the carb on his 04. There is a cavity with two screw holes that has an unfinished look to it. I found an exploded FCR diagram that does show a diaphragm, spring and cover that goes there. Apparently it is not used on all models of the FCR carb. Does anyone know what this is for? An alternate accelerator pump location?

http://www.sudco.com/fcrmx.html

AUSBERG · Feb 24, 2007

Doesnt the DRZ400 FCR have a vacuum operated anti run on device or similar to cut fuel supply to the pilot circuit in high vacuum situations?? (ie slowing down with the throttle chopped) for emissions reasons ??

whosahberg · Feb 25, 2007

AUSBERG is correct , it is called a coast enrichener .

husabutt · Feb 25, 2007

Good call. Found a pic of the offending pollution control device installed on a DRZ.

http://www.4strokes.com/tech/suzuki/drzadjet.asp

LINEAWEAVER · Feb 26, 2007

Anti Backfire Valve / AKA Decel Valve.

Quite common on large displacement singles firing every 360 degrees.

High vacuum on decel creates a lean condition which can cause exhaust popping and on occasion a backfire strong enough to remove the carburetor.

Dale

swedishsteel · Feb 27, 2007

LINEAWEAVER said:
Anti Backfire Valve / AKA Decel Valve.

Quite common on large displacement singles firing every 360 degrees.

High vacuum on decel creates a lean condition which can cause exhaust popping and on occasion a backfire strong enough to remove the carburetor.

Dale

Aka Air cut valve.
And as Lineaweaver say its only on big 650 its stock on husa.

Regards

Taffy · Feb 27, 2007

LINEAWEAVER said:
Anti Backfire Valve / AKA Decel Valve.

Quite common on large displacement singles firing every 360 degrees.

High vacuum on decel creates a lean condition which can cause exhaust popping and on occasion a backfire strong enough to remove the carburetor.

Dale

hey dale you want to be careful how you say that! you're on a loser either way.

they fire every 720
yes but they fire every 360.....

while i'm about.....

regards

taffy

LINEAWEAVER · Feb 28, 2007

Taffy said:
LINEAWEAVER said:

Anti Backfire Valve / AKA Decel Valve.

Quite common on large displacement singles firing every 360 degrees.

High vacuum on decel creates a lean condition which can cause exhaust popping and on occasion a backfire strong enough to remove the carburetor.

Dale

Click to expand...

hey dale you want to be careful how you say that! you're on a loser either way.

they fire every 720
yes but they fire every 360.....

while i'm about.....

regards

taffy

:lol: LOL

OK,OK.
"Large displacement four-cycle single cylinder motorcycle engines using an ignition cycle of 360 crankshaft degrees".

Dale

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FCR missing parts

husabutt

AUSBERG

whosahberg

husabutt

LINEAWEAVER

swedishsteel

Taffy

LINEAWEAVER

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