Culprit

Member
Aug 31, 2005
13
0
YZ-100 won't rev

My friend picked up an old YZ-100 on the weekend. It is roughly 1979/80 model. I cleaned the carb and air filter and it starts and runs ok but will not rev up. I pulled the lid off of the air box and it seemed to cure it. Tried pulling the silencer with the lid on airbox (thought maybe the silencer was plugged) and it did not rev up. Does anyone have any other suggestions? Also does anyone know what size main jet should be installed in this bike?
 
Last edited:

chevyss_98

Member
Feb 26, 2006
59
0
i used to have a 79 YZ 100, but it had a bigger engine in it (180ccc) so it flew, now normally that bike comes with a twin air filter airbox, by that i dont mean the brand, i mean it has 2 filters, if they arent overoiled, then i would say its a jetting problem, too rich, and or the ignition might be flaking out on ya, i had the same prob with ignition

lemme know what happens, goodluck
 

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