Play in throttle

On my 2002 yz426 i just bought i noticed they is about a 1/4 to 1/2 inch of play in the twist before it starts to actually accelerate the motor. I didnt notice this on my 1999yz400 that i just sold. SO when you have the bike running and you twist the throttle the first 1/4 to 1/2 inch of "twist" does not do anything, but after that "play" the bike starts to rev. What can i do to take this slack out?

What can i do to take this slack out?

You could adjust the cable.....

there should still be some play in the throttle when properly adjusted , around a 1/8"or so .

there should still be some play in the throttle when properly adjusted , around a 1/8"or so .

Thats more of a rider preference. I prefer no play in mine. :cool:

The YZF 2 cable throttles are a little different than single cable units. In single cable throttles, the throttle return stop for the slide is at the carb, and the grip itself is stopped by a stop within the grip assembly. That means that the cable free play is the difference between where the grip rests on the stop, and where the cable starts lifting the slide.

In the YZ, there is no stop in the grip. The return of the grip is stopped when the closing cable draws tight against the closed slide, so the free play in the cable is only between the two cables, so even if the play is zero, the cables are not holding the throttle open as they would be in a single cable setup. But before you zero it out, do this: decrease the clearance to about 2 mm, then swing the bars through their entire range, checking the clearance all along. Never go tighter than when the clearance goes to zero at any point in the sweep.

One other thing to check for is whether or not the play you see in the throttle is a result of the tube fitting the handlebar poorly. If the throttle tube is too loose on the bar, it will always feel sloppy.

You could adjust the cable.....

ok, how do i do this?

ok, how do i do this?

There are 2 10mm nuts on the cable ends (where the cables go into the carb). You can adjust the cables right at the carb. You may need to remove the seat and tank to give you a little more room to work with.

Thats more of a rider preference. I prefer no play in mine. :cool:

Dang 642, i used to like no play in mine either but after i get tired towards the end of a race, i'm glad i have a little play in there.....Especially through rough whoop sections. Your a brave man!!!!

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