plug problems with '84 250R

[Wally]

I'm having problems fouling plugs with my 1984 Honda 250R. I can't go 30 minutes with a champion QN-2C. NGK isn't much better. The only plug that won't foul is a Bosch WR7-DP. My fuel/oil mixture is 20:1. It bogs when it idles and the plug is black, but I blew the engine in it once travelling long distance with this bosch plug???? Any suggestions?

[TRI-Zbrian]

your mixing it too rich try 32:1 or 40:1 and im not sure what plug size an 84 takes but if its the same size as an 85 the use an NGK BR8ES

[Trikeaholic]

yea, the new oils dont have to be so thick! I run a safe 40-1 in all my 2 strokes, just fause Im chicken of frying the motor, and most are newer rebuilds with few hours. even that seems kinda "smoky". Probably could thin it out more even.