Please bear with me if this has been answered before. With the primary/trans shared fluid in a Sportster, and a clunk when shifting the transmission, can I use Redline V-Twin transmission oil with shockproof for this fluid?

 

is that for a go kart or a harley?

 

No. Not good for the clutch. Way too much moly in the shockproof gear oil for a wet clutch application. I would use a 20w50 Motorcycle rated oil like HD Syn3 or Mobil1Vtwin 20w50 or HD Formula +. Some guys use Mobil175w90 with no ill reports. But the shockproof oils are way too thick and have additives that might cause clutch issues. The clunk is normal.

 

Thank you.

 

Redline makes Primary Chain Case Lubricant, which is SAE 70W80.

http://www.redlineoil.com/product.aspx?pid=120&pcid=13

 

also,

information on Redline PowerPack for V-Twin to change all three holes for a good price.

http://www.redlineoil.com/product.aspx?pid=105&pcid=19