Walbro wb55 and the Yamaha

Guy Barrett · Posted: Thu Aug 02, 2001 4:29 pm Post subject: Walbro wb55 and the Yamaha

Can anyone help me out here...I would like to know what sort of jet settings as well as pop off for this carb when used on a Yamaha in Rookie Jr., any feedback would be appreciated.

Thanks...GB

Guy Barrett · Posted: Sun Aug 05, 2001 7:53 am Post subject: Walbro wb55 and the Yamaha

Is this the same carburetor that is used on the HPV-1 for cadet ?

Jeff Braun · Joined: 20 Jul 2001 Posts: 205 Location: Ovalo, TX

Guy:

We ran this class last year in WKA Nationals. Our engines were built by Woltjer. At most tracks we ran LS=2.0 to 2.25 and HS= .1 to .3. The pop off was high compared to the WB3a carb, in the 20 to 25 psi range. This is the same carb as used on the Jr. Sportsman HPV #1 class.
WKA allows a carb marked HPV#1, or unmarked carb to be used on the Yamaha class. But you MUST have a carb marked HPV#1 for the HPV class.
Jeff

Guy Barrett · Posted: Mon Aug 06, 2001 7:40 am Post subject: Walbro wb55 and the Yamaha

Thanks Jeff...big help
..Guy