Andrews 4 degree gear

[bulldog68]

picture of the Andrews 4 degree gear that is engraved wrong....4+ should be 4-

 

[Hooter]

looks like a +4 to me?

 

[bulldog68]

It is +4 if mounted with the -4 side out.
+4 side is advancing the crank gear, retarding cam, should be opposite.

 

[NGOT8R]

It is +4 if mounted with the -4 side out.
+4 side is advancing the crank gear, retarding cam, should be opposite.

Have you seen a photo of an Andrews -4 ignition advance sprocket? I wonder if the engraving is in the same location as the +4 sprocket? I was thinking about doing this mod, but don't know if I should, seeing as how I will be dropping another tooth on the front pulley when the bike goes back together.

 

[bulldog68]

I am not a motor builder, so I cant answer your question.
Typically the 4 degree gear is used to raise or lower the compression slightly and move the power right or left slightly. I am told it help some cams more than others.
I see your from KC. Joe Lyons at Rawhide HD did the tuning and will remember this gear problem. He is very knowledgeable and would be a good person to ask.

 

[NGOT8R]

Thanks bulldog68, I'll keep that in mind. I definitely want to do all that I can to bring the power on earlier, whether it be done solely with the pulley, or coupled with an ignition advance gear. Did you do a before and after dyno comparison to see what gains were made? Are you also running cams?

 

[hulkss]

You guys are talking about cam drive sprockets. Don't confuse them with cam drive gears - the advance angles are different for each.

 

[bulldog68]

cam gear +4 and -4