Author Topic: 1975 Supersport, performance cafe (Read 119968 times)

gnarlycharlie4u · « **Reply #375 on:** July 15, 2012, 10:16:57 AM »

Quote from: Doctor_D on July 15, 2012, 07:33:34 AM

Both curves are nice and smooth, which I attribute a lot of to Mike's head-work, the CR replica pipes, a well matched cam, and getting the intake length properly tuned. What I've also learned is that the bike likes to run about 12.5:1 AFR to really make power.

isn't that the optimum A:F for most efficient combustion of gasoline?

That's some great work you've laid out so far. Thank you.

Doctor_D · « **Reply #376 on:** August 23, 2012, 11:50:47 AM »

The Nighthawk 650 oil cooler was never going to work, because the pipes tuck in too close to the motor to use a sandwich adapter under the oil filter. But, the oil was hitting 240-250 after a typical dyno session, and not having one seemed like a bad idea. So, I took a lesson from the CR750 oil cooler setup (and the Bol d'Or bikes) and decided to run the lines up top.

I bought a little Russell oil cooler. It's small, but fairly deep. Looks to be a pretty efficient design.

A few hours with the bandsaw and drill press and some hardware store 2" aluminum L-channel was turned into some acceptable-looking bracketry.

Some 45 deg -8AN fittings made for a good fit. Lines run cleanly through the frame without tight radii or other interference.

I'll have pics of the oil-tank side routing some time this week.

MCRider · « **Reply #377 on:** August 23, 2012, 12:02:41 PM »

Very nice!

HondaMan · « **Reply #378 on:** August 23, 2012, 12:27:13 PM »

Nice installation!
Does it clear the back of the front fender OK, in full-fork compression? I've sometimes had troubles with dented fenders from these oil coolers.

Doctor_D · « **Reply #379 on:** August 23, 2012, 01:21:20 PM »

Quote from: HondaMan on August 23, 2012, 12:27:13 PM

Nice installation!
Does it clear the back of the front fender OK, in full-fork compression?

Thanks.

I'm not running a fender (have a fork brace), but it should work fine. There's a good six-inches between the wheel and the cooler (and only 4" of suspension travel).

brandEn · « **Reply #380 on:** August 23, 2012, 02:02:29 PM »

You gonna make the Isle of Vashon on that beauty this year? Couple weeks away!

Doctor_D · « **Reply #381 on:** August 23, 2012, 02:27:58 PM »

Unfortunately, I'm out of town.

In any case, you really want me to kick that thing over on a ferry?

Sent from my ADR6400L using Tapatalk 2

MRieck · « **Reply #382 on:** August 23, 2012, 04:37:12 PM »

I like that woven line David. The stainless line can be a PITA as it is like a hacksaw if it touches anything.

Doctor_D · « **Reply #383 on:** August 26, 2012, 09:58:41 AM »

So here's the other half of the package, buttoned up and oil-tight.

Routing lines through the frame. Lots of room for a clean run.

Lines where they come into the oil tank. The 45 deg fitting goes to the engine and the 90 deg is coming from the oil cooler.

Big improvement in clearance and ease of installation is due to the fact that I cut the stock fittings off the tank and replaced they with brazed-on 3/8 NPT bungs. I was really only able to do this because I had to have the whole bike repainted this summer. (Don't ask... I mentioned it a few pages back.)

Finally, engine side. Not much has changed here. Line on the right goes to the cooler, while the one on the left goes to the tank.

Picking up the rest of my repainted parts today, and may even take this thing out for a ride.

Retro Rocket · « **Reply #384 on:** August 26, 2012, 08:31:40 PM »

Nice work as usual Dave...

Doctor_D · « **Reply #385 on:** August 30, 2012, 10:52:58 PM »

Repaint of tank is done. Hand lettered. We used Dupont and SEM paints this time and came closer to the stock 1975 color.

The "Supersport" is a little too low, but I wasn't going to have him re-do it.

Here it is on the bike.

johno · « **Reply #386 on:** August 31, 2012, 02:46:29 AM »

Looking really really nice "D"
Your obviously a perfectionist D but I prefer the lettering where it is , makes the honda badge stand out more. Hope you have a nice day when you take it for a blast.
ciao Johno

Doctor_D · « **Reply #387 on:** August 31, 2012, 09:57:18 PM »

Everything takes longer than it should. Completely reassembled the bike today.

Started second kick, then it started spewing oil from the alternator cover gasket.

I took the cover off while the parts were out at paint to install a CB750A field coil for a little better charging, and the gasket looked fine when everything was reinstalled - though obviously not.

Next up, the speedo magnet, which never contacted the forks before, was rubbing. Nothing about the front end changed, so that's got me scratching my head.

Finally, my fuel filter cracked! Why and how is beyond me. Simple repair, but annoying.

FunJimmy · « **Reply #388 on:** August 31, 2012, 11:03:55 PM »

Lookin Cherry.David.

754 · « **Reply #389 on:** September 01, 2012, 08:53:14 AM »

Very clean bike there... looks great..

bwaller · « **Reply #390 on:** September 01, 2012, 10:10:37 AM »

Looks great Dave.

raymond10078 · « **Reply #391 on:** September 07, 2012, 05:59:44 PM »

So glad you upgrade your oil cooler. The CB650 oil cooler wasn't designed for full flow - at least according to the CB650 Service Manual. Your engine will be happier with this one.

CBcafeJunkie · « **Reply #392 on:** June 15, 2013, 11:42:05 PM »

She's a beaut man good job

Greg H · « **Reply #393 on:** June 16, 2013, 01:43:52 AM »

I've just spent some time reading all of this thread , and I have to say the end result looks fantastic

. It's such an inspirational bike ,that I'm off into my garage to do some work on my bike

Doctor_D · « **Reply #394 on:** June 16, 2013, 07:38:20 AM »

Thanks folks. I've gotten it out a few times this spring, and it is a hoot to ride. Very under-braked for how fast it is though, so I'm making a few changes right now and will post an update soon.

I'm prepping a 1975 GL1000 front end for installation. I have EBC Pro-Lite rotors for it, rebuilt the calipers with phenolic pistons, semi-sintered pads, and am actuating the whole thing with a nice 14mm radial master cylinder - so it should stop a little better. As with the the original forks, the GL forks are getting the full RaceTech treatment. Waiting on a top-triple tree from Dime City and new minus-2" fork tubes from Frank's and they'll go right together.

The small things: new clip-ons, new headlight ears, etc. will come next month - and then we're done for a while. ( I really want to upgrade the swingarm and use a lighter-weight rear wheel and brake - like the Moto one Cycle-X has - but I'm trying to make that a 2014 project.)

MRieck · « **Reply #395 on:** June 17, 2013, 04:56:25 AM »

Yes....you need more brake Dave.

Doctor_D · « **Reply #396 on:** June 17, 2013, 12:13:59 PM »

Quote from: MRieck on June 17, 2013, 04:56:25 AM

Yes....you need more brake Dave.

Tell me about it. Coming down from high double and triple digits is hairy enough when you know you need to brake.

Bike in its current state:

SOHC4 Cafe Racer Fan · « **Reply #397 on:** June 17, 2013, 06:18:18 PM »

Quote from: Doctor_D on June 17, 2013, 12:13:59 PM

Quote from: MRieck on June 17, 2013, 04:56:25 AM
Yes....you need more brake Dave.

Tell me about it. Coming down from high double and triple digits is hairy enough when you know you need to brake.

Bike in its current state:

Freakin' gorgeous, Dave!

ivanhoew · « **Reply #398 on:** June 17, 2013, 11:15:54 PM »

lovely photo.

SOHC4 Cafe Racer Fan · « **Reply #399 on:** June 18, 2013, 09:07:22 PM »

Quote from: Doctor_D on June 16, 2013, 07:38:20 AM

Thanks folks. I've gotten it out a few times this spring, and it is a hoot to ride. Very under-braked for how fast it is though, so I'm making a few changes right now and will post an update soon.

I'm prepping a 1975 GL1000 front end for installation. I have EBC Pro-Lite rotors for it, rebuilt the calipers with phenolic pistons, semi-sintered pads, and am actuating the whole thing with a nice 14mm radial master cylinder - so it should stop a little better. As with the the original forks, the GL forks are getting the full RaceTech treatment. Waiting on a top-triple tree from Dime City and new minus-2" fork tubes from Frank's and they'll go right together.

The small things: new clip-ons, new headlight ears, etc. will come next month - and then we're done for a while. ( I really want to upgrade the swingarm and use a lighter-weight rear wheel and brake - like the Moto one Cycle-X has - but I'm trying to make that a 2014 project.)

Doc,
I'm doing a GL1000 fork swap too. Can you share where you got the phenolic pistons and EBC discs and details on the parts?

News:

Author Topic: 1975 Supersport, performance cafe (Read 119968 times)