1979 Yamaha YZ250 jetting ??? New pics too! Vintage ThumperTalk

Yz 250 Jetting. MXA GUIDE TO YAMAHA YZ250 TWOSTROKE JETTING (19992021) Motocross 175 main jet 48 pilot jet stock needle 2nd position air screw 1.5 turns out I'll give my setup and riding area stats before the problem I'm having

30:1 fuel ratio The bike is brand new with less than 10 hours on it I'll give my setup and riding area stats before the problem I'm having

MXA GUIDE TO YAMAHA YZ250 TWOSTROKE JETTING (19992021) Motocross

Hey there folks! Need some help ironing out a foul issue with my bike Does my jetting sound too rich? It is all stock settings I'll give my setup and riding area stats before the problem I'm having

ASK THE MXPERTS DO YOU HAVE 1988 YAMAHA YZ250 JETTING SPECS. For some models we offer a Power Up jet kit for optimum tuning It was made by taking Yamaha's manual recommendations and using the density altitude calculator to correct for altitude and temperature.-If you will be racing or running in open desert conditions, richen each jet by one size and the needle by 1/2 step

YAMAHA YZ250 TWOSTROKE JETTING (1999 TO 2014) Motocross Action Magazine. Hey there folks! Need some help ironing out a foul issue with my bike James Dean designed this jetting kit for Yamaha riders looking to push their motorcycles to the next level