A forum for owners of Yamaha TTR250 trail and enduro bikes!

Just thought I'd put a quick post in as there seems to be a few issues with this.

My bike was having issues returning to a normal idle when coming to a stop. (It stayed high or took a while to return or needed a blip to return it to normal)

I had previously rebuilt  it with an 'All Balls' kit. 

After trying all the obvious things I eventually pulled the carb completely down.

Everything looked OK until I got the slide linkage arm out. 

There was a small spring that was between 2 pins. One end of this small spring had come off one of the pins.

(Actually it looked like one end had stretched and come off. )

I didn't have a replacement so I just bent it back into place and refitted it.

After a bit of researching..

"The small spring situated between the two pins on the carburetor slide linkage arm serves to eliminate mechanical slack, reduce free play (anti-backlash), and prevent throttle slide flutter."

• Takes up tolerances: The Teikei Y30P carburetor uses a multi-piece mechanical linkage with pins to actuate the throttle slide. This spring keeps continuous tension on the mating joints to remove any manufacturing gaps or wear-induced play.
• Stabilizes the throttle slide: Engine intake pulses create strong vacuum fluctuations that pull on the slide. The spring keeps the linkage tightly preloaded so the slide cannot vibrate, rattle, or flutter inside the carburetor body. 
• Ensures crisp throttle response: By removing the "dead zone" or lag between the upper actuator arm and the lower slide assembly, any movement from your throttle cable results in immediate, precise fuel metering.