I use this light from harbor freight. You will need an external 12v battery to power the light. ---www.harborfreight.com/timing-light-with-advance-40963.html

CHP in Texas, NEVC(Hondanuts) in NY or TBparts

dratv.com/c70passportnew.html

@@VintageHondaMinis thank you so much

With the idle set as high as it was, the mechanical advance was probably coming into play already. I'm sure there is a recommended rpm for idle, IF you are going to use a timing light. Without a feeler gauge and tach, he basically timed it by ear. It may, or may not be set correctly, but he and we will never know. I just picked up a non running 74 XL70, and looking forward to going through all of this with mine. I plan on doing a full restoration on it. If you have a channel, and have some good advice to help me along, please let me know.

They both used this type of flywheel with advancer. 3 speed ct70s/z50s used a different non advancing flywheel. Crank end taper is specific to each setup too.

It is not whatever. I'll trust my timing light over a feeler gauge. Not every point is perfectly built, there are variations that can cause bad spark timing. You can use your feeler gauge, but the timing light will provide the final say.

@@VintageHondaMinis exactly.

timing light is the true mark ...

@@VintageHondaMinis not true. You set the timing mark to the F. Then use a feeler guage for point gap. If it’s not within tolerance then change the points etc. your just doing random testing. By the old school light method and feeler gauge it takes literally 30 seconds to 1 min max to time these bikes.

@@dean3919 if you set your timing like him then you guys need to go back and learn how to work on these bikes. You do not start and stop a engine a million times with a timing light to set points.