I see alot of people build bikes but very few people use the proper size hoses on oil coolers. Anything smaller then a 4AN creates a bottleneck and restricts the flow of oil to and from an oil cooler. The takegawa slimline hoses are too small and I scratch my head on my Takegawa even sells those tiny hoses. The takegawa slimline hose is a 3AN brake hose. 3AN is too small.
I like to use 6AN Earl's Autoflex Stainless Braided Hoses for my projects with Earl's swivelseal fittings due to a greater application of bends and the beefy look. The lines hold more oil and I see this as a benefit as well. Earl's makes pretty much any type of adapter you'll need to use and custom make your own lines. It can get a touch pricey, but looks great and will last the life of your bike.
The first obstacle is cutting the stainless braided hose. The boys at anplumbing.com were nice enough to explain how to properly cut and install hoses without cutting the crap out of your hands or making a mess. You use a hammer and chisel! No cutoff wheels or hacksaws that make a huge mess and fray the lines. No taping the cuts before you cut them.
All the vids can be seen here that will shed some light and take the guesswork out of using earls lines.
AN Plumbing.com Technical Section, Earls Performance Products,Technicle Information
Hose cutting:
[ame="http://www.youtube.com/watch?v=u1J7u8sG118"]YouTube - Hose Cutting[/ame]
Installing a Swivelseal fitting:
[ame="http://www.youtube.com/watch?v=aDSozy6MZto&feature=related"]YouTube - #6 Swivel Seal Assembly[/ame]
Last night, it took me 15 minutes to hook up the oil cooler on my CT70 project. Clean, no mess and no bloody fingers.
I used a Daytona oil takeoff plate that has 10mmX1.25 Pitch banjos.
I removed the banjo bolts and run an Earl's 10mmX1.25P adapter to 6AN Male. I needed two of these.
I then ran a 6AN swivelseal fitting 90 degrees on the top, and a 60 degrees on the bottom for clearance.
The Takegawa oil cooler I used has a 12mmx1.0 Pitch thread, so I used a 12mmX1.0P adapter to 6AN male (X2) and a 6AN 90 degree on the left side and a 120 degree on the right.
Cut my hose to length and voila, easy project and clean install. I added a hose bracket for show, but it really wasn't needed.
I like the blue and red fittings, but if you don't like the bright color, Earl's makes the swivelseal fittings in black as well. I'll do the same with the tappet cover here once I get my tappet cover tapped for a 1/8 NPT thread. I'll run a 1/8 NPT with a 90 degree bend.
Earl's fittings can be fit to almost any oil cooler. You just need to figure out what the thread pitch is on your existing cooler and get a takeoff plate that will accept fittings and you are good to go.
Keep the rubber side down ladies and gents.