Doing a tune up: My Operation & Maintenance Manual says to set "Timing @ idle RPM 10*BTDC with a Spark Plug Gap = .035 in (0.9mm). But my Service Manual #16 under section 1B maintenance : "Timing @ idle RPM 8* BTDC" .
Which one is the correct setting? 8* or 10* BTDC ?
The engine has a Weber...
