Board index Flathead Power-Technical Questions, Answers, and Suggestions K-Models Manual Spark Advance

Manual Spark Advance

Post Tue Apr 08, 2008 8:49 am

Posts: 42
Location: Sylacauga, AL. USA
Heys guys,

I'm going to use a standard K/KH manual advance distributor on my racer in total loss mode. From what I see on the Ks & KHs on display at the Barber Museum, the cable is attached to the side of the distributor and then runs between the cylinders. I can't see where it comes out , what type of mechanism activates it, or where it's mounted. I would guess it uses a similar setup to an old lawn mower manual pull choke. I assume this changes the timing to make starting easier? A photo of the mechanism would be really helpful.

Thanks in advance!

Post Tue Apr 08, 2008 10:13 am

Posts: 55
Location: west coast
Hey DLM32,
The advance-retard cable was internally controlled in the left twistgrip. The left side had a spiral grip sleeve, and a slot in the bar, just like the throttle. Roll it back to retard,(start) and in, (toward the rider) to advance. The cable routed up thru the triple tree, opposite the throttle cable. Hope this helps.

Post Tue Apr 08, 2008 10:26 am

Posts: 591
Location: Crewe, Great Britain

Hi dlm32,

The outer of the retard cable is clamped on one of the cylinder nuts.

If you really want this set up on a racer, make sure you do it so that full advance would be with throttle or lever at rest, so you would pull to retard... much safer, you don't have to hold it at full advance in the heat of a corner or whatever and you don't have to think about it while racing... Once started, should be set at full advance all the time.

IMO, it won't make a racer any more easy to start if you retard the spark, same with a choke!!!


Post Tue Apr 08, 2008 10:44 am

Posts: 42
Location: Sylacauga, AL. USA
Thanks guys,

I was looking at my parts manual, and was pretty sure it was twist grip operated. Jim Haubert just happened to call and he confirmed it. I'm using clip ons, and won't try to make that set up work on them. If I find I need it, I'll just rig a manual pull cable.

Thanks again guys!

Post Wed Apr 09, 2008 10:18 am

Posts: 332
Location: north central Ma.
Most of the vintage guys around here use a spring to hold the distrib at full advance after starting it.
They unclip one end of the spring twist the distrib to retard sart the bike then re clip the spring on to the cyl fin and go race.

"Smok'in the competition NOT Tobacco"
"Transplant organs, Don't bury them!"
Why dwarf? 5/8 scale race cars!

Post Fri Apr 11, 2008 8:14 am

Posts: 42
Location: Sylacauga, AL. USA
Thanks 44dwarf! I'll do that! :D

Return to K-Models