I am in the process of putting s and s 509g cams and gear drive in my 06 road king. I have .002 pinion runout which is in spec. Got it all in but in the 12 and 6 o clock position i have .0005 thousandths of backlash and 0 at 3 and 9 o clock position. Its looking like I need an undersize gear. Has anyone had to buy an undersize gear for their bike and if you did how much lash do you get out of them? Is one undersize say .001 undersize and the double undersize .002 undersize? I know there are 2 undersize options but s and s doesnt list anything about it. Im sure they just asume you are gonna buy both gears for 100 each which is just insane for one small gear, Thank you for any info you can give me.

 

I'd run it.. Might whine a little when cold but they won't rattle when hot..

 

No way am I running it like that. I was just curious if anyone would know how much clearance the undersize gears give.

 

Why not? Done it a number of times.. Are you using a 10th indicator?

 

and .001 under pinion gears are on ebay for around $40-50.
https://www.ebay.com/p/S-S-Cycle-33-...=nc&opts=opick

 

 

Install with confidence and ride.
Scott

 

Blue06
you don't happen to be a mechanical engineer do you? I have friends that seem to over think things way to much. These Harleys aren't refinery turbines needed 0 tolerance clearances haha

 

Thats what I needed to know how many thousandths a gear gives you seeing there is undersize and double undersize. Thank You

 

No im not an engineer but if S and S says that is the tolerances that it should be thats what I want.