Author Topic: Yet another CB750 racer. (Read 5334 times)

greenjeans · « **on:** October 18, 2016, 06:49:11 AM »

Finally got around to finishing up a bike for me. 1970 CB750. Motor is bored out to an 836 using some vintage Venolia/RC engineering pistons, new rings, and some cyclex mls gaskets. New dynoman valve springs, guides. Cylinder had some porting done by RC Engineering in 1974 (documented). Serti valve job. The crank had been micropolished and balanced, and had the alternator rotor lightened by RC Engineering - also back in '74. Swingarm is one of Chris Redfern's (MotoGP werks) as well as the stainless pipes. Brake is a buffalo 4LS with new linings and pads. Oil tank came from Old Scrambler. Tank is aluminum and believed to have come from India. Had most of the parts on my shelves for years. Don't worry K0 resto guys - it was just a motor, frame (that was already cut), and a box of leftovers.

SOHC4 Cafe Racer Fan · « **Reply #1 on:** October 18, 2016, 09:10:51 AM »

Quote from: greenjeans on October 18, 2016, 06:49:11 AM

Finally got around to finishing up a bike for me. 1970 CB750. Motor is bored out to an 836 using some vintage Venolia/RC engineering pistons, new rings, and some cyclex mls gaskets. New dynoman valve springs, guides. Cylinder had some porting done by RC Engineering in 1974 (documented). Serti valve job. The crank had been micropolished and balanced, and had the alternator rotor lightened by RC Engineering - also back in '74. Swingarm is one of Chris Redfern's (MotoGP werks) as well as the stainless pipes. Brake is a buffalo 4LS with new linings and pads. Oil tank came from Old Scrambler. Tank is aluminum and believed to have come from India. Had most of the parts on my shelves for years. Don't worry K0 resto guys - it was just a motor, frame (that was already cut), and a box of leftovers.

Very nice bike!! A little old and a little new (but period correct). Just curious as to why you went with the twin-leading shoe front brake instead of rotors.

greenjeans · « **Reply #2 on:** October 18, 2016, 09:20:54 AM »

I've had that brake on the shelf for a while now. Just couldn't bring myself to sell it. So... to answer your question, I just think it looks cool. That's it.
Stops as good as a stock disc with the new pads and linings. Ultimately, I'll change to a dual disc. I was looking for some different period-era calipers to use - just got too expensive at this point. I'll rustle some up eventually.

seanbarney41 · « **Reply #3 on:** October 18, 2016, 09:35:59 AM »

I like it. Add a front fender and some rearsets and you got one hell of a bike.

kmb69 · « **Reply #4 on:** October 18, 2016, 09:39:37 AM »

Quote from: greenjeans on October 18, 2016, 09:20:54 AM

I've had that brake on the shelf for a while now. Just couldn't bring myself to sell it.....

Hoarding parts, huh?

Very, very nice progress, John.

SOHC4 Cafe Racer Fan · « **Reply #5 on:** October 18, 2016, 09:43:56 AM »

Quote from: greenjeans on October 18, 2016, 09:20:54 AM

I've had that brake on the shelf for a while now. Just couldn't bring myself to sell it. So... to answer your question, I just think it looks cool. That's it.
Stops as good as a stock disc with the new pads and linings. Ultimately, I'll change to a dual disc. I was looking for some different period-era calipers to use - just got too expensive at this point. I'll rustle some up eventually.

I think it's cool, too. I bet it has at least as much stopping power as the stock disc.

CBGhia · « **Reply #6 on:** October 18, 2016, 11:03:26 AM »

I wasn't able to get up to the show. I heard it was great. I saw the pictures online and I knew it had to be you. Good job!

SOHC4 Cafe Racer Fan · « **Reply #7 on:** October 18, 2016, 11:29:45 AM »

I just noticed the wheels. They look like the shouldered Excel wheels or Akronts but you've painted or powdercoated the inside of the rim black. Nice custom touch.

What is the story with the tail? Is it aluminum, steel or fiberglass? Custom?

greenjeans · « **Reply #8 on:** October 18, 2016, 12:04:33 PM »

Quote from: CB750 Cafe Racer Fan on October 18, 2016, 11:29:45 AM

I just noticed the wheels. They look like the shouldered Excel wheels or Akronts but you've painted or powdercoated the inside of the rim black. Nice custom touch.

What is the story with the tail? Is it aluminum, steel or fiberglass? Custom?

Tail piece is off a Kawasaki KZ750B. I took a section out of the middle and some off the bottom edges as well. Always liked the little lip they have.

Shouldered aluminum. Yep, I painted the centers. They'll get a pin stripe as well.

greenjeans · « **Reply #9 on:** October 18, 2016, 12:07:55 PM »

Quote from: seanbarney41 on October 18, 2016, 09:35:59 AM

I like it. Add a front fender and some rearsets and you got one hell of a bike.

I just can't do full on rearsets. I'm too tall and my feet get in the way.
The foot pegs are actually moved back 4" from stock and up about 3/4" - More for my riding tastes and big feet. Just had to shorten the brake lever and the shifter.
Still contemplating a fender. I have a Tarozzi fork brace on there that I really like. Still, I'd like a fender incase I get stuck in an unexpected downpour. As it currently sits, it's more for show and sunny day riding.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #10 on:** October 18, 2016, 12:47:34 PM »

Swoop · « **Reply #11 on:** October 18, 2016, 01:02:14 PM »

Very sharp looking bike....clean. I like the Hondasaki look of it. Especially the seat/tailpiece. You might not want to go too fast till you make sure that the angle of the rear spokes are not going to be an issue.

Bootsey · « **Reply #12 on:** October 18, 2016, 01:48:44 PM »

That's one nice bike, awesome work!

bill440cars · « **Reply #13 on:** October 18, 2016, 02:15:30 PM »

I agree, Very nice build, at that. Yeah, bout the only 2 things I'd change, would be to add a front fender and change ownership (to Me)

hashvm · « **Reply #14 on:** October 18, 2016, 03:30:22 PM »

That's a really good looking bike, good job!

Retro Rocket · « **Reply #15 on:** October 18, 2016, 05:05:54 PM »

Bike turned out great John, you ended up with a good balance, something lacking in many racer/cafe racer builds. I would incorporate some kind of fenders to keep the muck of the vital bits...

Oh, and its Chris Redpath mate...

greenjeans · « **Reply #16 on:** October 18, 2016, 05:56:58 PM »

Apologies to Chris Redpath - got a buddy at work (Redfern)
Thanks fellas. I thought long and hard about doing another cafe bike.

BPellerine · « **Reply #17 on:** October 18, 2016, 06:31:18 PM »

nice bike,is that the engine that had the 315 cam in it?bill

greenjeans · « **Reply #18 on:** October 19, 2016, 06:07:55 AM »

Yep. Has a stocker 69 in it now.

turkey4me · « **Reply #19 on:** October 20, 2016, 05:52:10 AM »

Freaking cool bike. Great choice of colors and seat design. Bet you're happy with the handlebars. A short black fender with matching pin stripes would look sweet. Did you put rear turn signals in the frame or just black inserts where it was cut?

greenjeans · « **Reply #20 on:** October 20, 2016, 09:40:32 AM »

thanks, turkey. Yep, I will be putting turn signals in the frame rails - I have plugs in there now, all my wiring is in place. I'll fab up a fender for the front, just had a hard deadline and this was as far as i could get with the time I had. I haven't even got to ride it yet, but I've done another with the same set-up and really like it. I'm more of a mountain bike BMX guy so I like my feet under me. Hope to add some sort of front windscreen as well. Stay tuned

Stev-o · « **Reply #21 on:** October 20, 2016, 03:55:38 PM »

Great job GJ. Thought that tailpiece looked familiar, I like it.

Old Scrambler · « **Reply #22 on:** October 24, 2016, 12:28:20 PM »

Good Looking Custom............with a few pedigree parts

John........Thanks for the plug about the oil tank

greenjeans · « **Reply #23 on:** November 08, 2016, 06:41:24 AM »

My buddy James Trawick shot this one

Darren Jakal · « **Reply #24 on:** November 08, 2016, 09:02:49 AM »

That is a great looking bike! Nice picture.

palepainter · « **Reply #25 on:** November 08, 2016, 12:54:35 PM »

That bike is perfect in everyway. Congrats!!

SOHC4 Cafe Racer Fan · « **Reply #26 on:** November 08, 2016, 02:35:52 PM »

Let's keep this one in mind for January BOTM!

pipeguy · « **Reply #27 on:** November 08, 2016, 06:44:37 PM »

Great job John, love the colours.

SOHC4 Cafe Racer Fan · « **Reply #28 on:** December 01, 2016, 04:36:35 PM »

Congratulations, greenjeans!
Your bike has been nominated for Bike of the Month January 2017. Please post that you "ACCEPT" in the nomination thread: http://forums.sohc4.net/index.php/topic,162434.0.html

What a great bike!

firebane · « **Reply #29 on:** December 01, 2016, 07:48:26 PM »

Couple questions on your bike.. what bars are you using and are running a 18/18 setup?

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Author Topic: Yet another CB750 racer. (Read 5334 times)