I have an '06 deuce that I bought new last fall. I've had the 1K service done and the dealer put SYN-3 in all three holes. From reading through some of the posts here, I am starting to feel sick to my stomach. I think I am going to do my own fluid changes from now on and thought I would ask for recommendations / reasons. I am curious about oils/gear oils, what mileage intervals you all would suggest, ok to just replace the oil/gear oils w/something new when it's time? My bike has approximately 4,100 miles on it now.

 

My recommendation is that at 5000 miles or sooner, you put Redline 20W50 in the crankcase w/ a new K&N filter, Redline MTL in the primary, and Redline Shockproof Heavy in the transmission. You can get Redline from MyOilShop.com shipped (at reasonable cost) directly to your door. The K&N filter is either a KN-171B (black) or KN-171C (chrome). Just my opinions.

Some forum sponsor may also offer Red Line oils.

 

Thanks OneBlackFly, do you know if I could just drain the SYN-3 from the crank, tranny, and primary and switch over to these fluids when I decide to do it?

 

Yes, just drain, check o-rings and replace gaskets, then fill'er up! Nothing special needed.

 

I guess I am worried about compatability probs. between SYN-3 and the new stuff? Should I have any concerns there?

 

None, just get SYN3 out soon. Again, my opinion from the many posts on this forum.

 

You can also sub either Mobil 1 V-twin or Amsoil 20W-50 for the primary and crankcase and Mobil 1 or Amsoil 75W-90 gear oil in the transmission if you don't want to wait on ordering the Redline products. I use Mobil 1 V-twin 20W-50 in my crankcase and primary and Redline Shockproof Heavy in the transmission. I change all the fluids and the oil filter every 2500 miles. That's probably too frequent, but it's my bike. I keep my vehicles for a long time so for me, it's good insurance. Oil is cheap, vehicles are expensive.

That said, I target the fluid changes at 2500 mile intervals, but if I run over a few hundred miles, I don't sweat it.

If you don't have the HD service manual for your bike, I'd suggest getting one. It's the best $50 you can spend on your bike. Also, watch Sears as they run their bike / ATV lift on sale for $70. It makes servicing and cleaning the bike much easier.

Good luck and congratulations on your Deuce. It's a great looking bike.

 

Thanks oldgeezer (it sounds funny saying that to someone), I had in fact planned on purchasing a bike lift sometime soon and I bought the service manual, which I have used a bunch already, shortly after purchasing my bike. So it appears that it is cool to keep whatever synthetic oil I decide to use in the crank and primary, but need a gear oil for the tranny?

 

I'd use either 75W-90 synthetic gear oil or Redline Shockproof Heavy in the transmission. You are right, no compatibility problems with the oils. Enjoy the ride.

 

Just FYI ... MyOilShop.com has been real quick with their shipments to me. http://www.myoilshop.com/index.html