YS FZ & L Throttle barrels

[Bob Kane]

On your recomendation at the NATS, I did clean up the face on the rear cover. It is now very smooth. The valve cover gasket is new and the mating surface cleaned up. The carb bodies on both my FZ's have the large throat opening.
 
I was wondering if the metering slot ws different on the "L".  There is little else that would affect the amount fuel, unless the crank pressure changed
 
Your offer is generous. I plan on running the motor with the new DZ piston tonight to see if it changes anything. If it still is rich then I will take you up on your offer.  Thanks.
 
"Henderson,Eric" <Eric.Henderson at gartner.com> wrote:
Bob,
         One reason that the part number is different is that the L barrel had to clear the casing where a rear mount would be fitted. The FZ did not have that protrusion.
 
FZ's came with a smaller throat and then production transitioned, without anyone telling us, to an L size throat. Then the L's came along with the same big throat and the increase rear-mount casting on the carb body.
 
Where there may be a difference is in the metering slit on the barrel but I can't see it with the naked eye. 
 
Bob, I can send you working carb barrel and body from one of my engines to see if that is the problem. Also the gasket on the rocker cover can leak and cause odd running in the mid range. Last but not least the rear rotor.
 
Regards,

Eric.
 
P.S.
 
They like 30% with two head gaskets..E.
 
P.P.S. The 140 Sport reverts back to using the pressure tap at the front of the engine instead of the rear plate. Like the .63, .91 and 120 FZ's. The hollow crank and pressure timing hole to the diaphragm are back again.
 
 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Troy Newman
Sent: Monday, August 18, 2003 12:30 PM
To: discussion at nsrca.org
Subject: Re: YS FZ & L Throttle barrels


The L throttle barrel is a larger diameter than the FZ barrel.....Now the FZ-II barrel and the L are the same...for those that don't know what the FZ-II is its the new 140 Sport motor.....
 
This barrel will work in the "L" call up Richard at YS Performance and talk to him about the need for an L throttle barrel He can hook you up with the proper barrel that will work.
 
By the way the "L" is not a discontinued motor as of yet.....I think they are still producing them.
 
Most of the parts between the "L" the FZ and the FZ-II (sport) are all the same anyways....The Sport and the L all have interchangeable parts....the L has a different Crank with the crank shaft ring...gives a little boost in power.....the Sport doesn't have this crank shaft ring.
 
Troy Newman
----- Original Message ----- 
From: Bob Kane 
To: nsrca 
Sent: Monday, August 18, 2003 10:51 AM
Subject: YS FZ & L Throttle barrels



The part number for the 140FZ throttle barrel is YS2685 and the L part number is YS4215. Has anyone compared the two to see what is different?  Does anyone have an L throttle barrel in good condition they are willing to part with?  Thanks.

Bob Kane
getterflash at yahoo.com 

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Bob Kane
getterflash at yahoo.com

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