INSTRUMENT AND CONTROL FUNCTIONS3-103Your Yamaha engine has been de-signed to use regular unleaded gaso-line with a pump octane number[(R+M)/2] of 86 or higher, or a researchoctane number of 91 or higher. Ifknocking (or pinging) occurs, use agasoline of a different brand or premi-um unleaded fuel. Use of unleaded fuelwill extend spark plug life and reducemaintenance costs.GasoholThere are two types of gasohol: gaso-hol containing ethanol and that contain-ing methanol. Gasohol containingethanol can be used if the ethanol con-tent does not exceed 10%. Gasoholcontaining methanol is not recom-mended by Yamaha because it cancause damage to the fuel system or ve-hicle performance problems.EAU03839Starter (choke) lever “ ”Starting a cold engine requires a richerair-fuel mixture, which is supplied bythe starter (choke).Move the lever in direction a to turn onthe starter (choke).Move the lever in direction b to turn offthe starter (choke).1. Starter (choke) lever “ ”U5LV12.book Page 10 Thursday, June 27, 2002 5:49 PM
