CB650Z racer

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hocus82
Posts: 47
Joined: Thu Jun 19, 2014 12:23 am
Location: Norway

CB650Z racer

Postby hocus82 » Sun May 03, 2015 8:00 am

Got the 650Z on the road this weekend. Great fun to ride. Now on to the 750k1 build.

Still some minor things to do, racing stripes on the tank and a different seat cover. Will also get some proper pics taken when it's all finished up.
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1979 Honda CB650Z
1971 Honda CB750 K1

hocus82
Posts: 47
Joined: Thu Jun 19, 2014 12:23 am
Location: Norway

Re: CB650Z racer

Postby hocus82 » Sun May 03, 2015 8:02 am

a couple of more...
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1979 Honda CB650Z
1971 Honda CB750 K1

hardpattern
Posts: 15
Joined: Thu Aug 20, 2009 9:34 pm
Location: Asheville, NC USA

Re: CB650Z racer

Postby hardpattern » Sun May 03, 2015 9:58 pm

BITCHIN'! Good work.

What are the levers?
1982 cb650

hocus82
Posts: 47
Joined: Thu Jun 19, 2014 12:23 am
Location: Norway

Re: CB650Z racer

Postby hocus82 » Mon May 04, 2015 1:02 am

Thanks man. The levers are Chinese-$40-ones from ebay I picked up for another project. Decent quality for the price.
1979 Honda CB650Z
1971 Honda CB750 K1

Hawk213
Posts: 70
Joined: Fri Oct 18, 2013 2:20 pm

Re: CB650Z racer

Postby Hawk213 » Wed May 06, 2015 1:44 pm

Nice bike! Where'd you get tank? And how much?

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WnRn
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Location: Central Coast NSW AUstralia
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Re: CB650Z racer

Postby WnRn » Wed May 06, 2015 2:53 pm

Hawk213 wrote:Nice bike! Where'd you get tank? And how much?


That would be the original 650Z tank.

hocus82
Posts: 47
Joined: Thu Jun 19, 2014 12:23 am
Location: Norway

Re: CB650Z racer

Postby hocus82 » Wed May 13, 2015 12:37 am

Thanks. And yeah, stock tank. Blasted and powder coated.

I've done a few miles and it so much fun to ride with the rear lifted (and front lowered), feels like a true racer. New rear shocks a bit stiff, but I'll live with that over the squishy stock ones.

Shouldn't have reused the caliper seals, they are leaking and will be rebuilt with new seals today. That's the only problem I've encountered so far, knock on wood. The engine even feels better with the new exhaust, almost no use for choke any more and strong all over the rev range. No problem doing the ton ;)

Started tearing down the 750 engine last night, so I don't think the 650 will get a new seat this season :)
1979 Honda CB650Z
1971 Honda CB750 K1

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Volker_P
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Location: southern Germany

Re: CB650Z racer

Postby Volker_P » Wed May 13, 2015 12:55 am

Really impressing work.
For the calipers, it is often the surfaces rather than the seals.
Cosky's great (free) online manual: http://cosky0.tripod.com

forum links to common technical issues

If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum

hocus82
Posts: 47
Joined: Thu Jun 19, 2014 12:23 am
Location: Norway

Re: CB650Z racer

Postby hocus82 » Wed May 13, 2015 2:36 am

Thanks volker. So you're thinking new pistons?
1979 Honda CB650Z
1971 Honda CB750 K1

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Volker_P
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Location: southern Germany

Re: CB650Z racer

Postby Volker_P » Wed May 13, 2015 3:26 am

Often pistons look bad (like all mine :roll: ), however they seem very hard to get. I heard that clubs did small reproduction series for older CB's.
No idea how it looks like for the CB650 now. In any case measure/verify exact piston dimensions before you buy something.

A bad piston surface will however not cause immediate leakage. It is crucial for tightness that the piston seal groove is intact and moreover that the caliper has no sharp grooves or edges that may damage the piston seal.
I think also the orientation of the seal plays a role, but rather for clearance after release than for tightness.
Cosky's great (free) online manual: http://cosky0.tripod.com

forum links to common technical issues

If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum

hocus82
Posts: 47
Joined: Thu Jun 19, 2014 12:23 am
Location: Norway

Re: CB650Z racer

Postby hocus82 » Sat May 16, 2015 2:57 pm

Changed the seals yesterday... getting good at doing this, both calipers redone in 20 minutes... leak free now, but need to get the rubber seals/bushings for the slider bolts..

Also got around to making the new seat today, laying down some fiberglass. Should be done in a few days completing this project.
1979 Honda CB650Z
1971 Honda CB750 K1

ross_cheeks
Posts: 19
Joined: Mon Oct 06, 2014 9:36 am
Location: Aberdare, South Wales

Re: CB650Z racer

Postby ross_cheeks » Mon Jun 08, 2015 3:06 pm

Lovely looking bike, what exhaust you running? I'm a sucker for a set up like that, its all about the symmetry of twin cans

ross_cheeks
Posts: 19
Joined: Mon Oct 06, 2014 9:36 am
Location: Aberdare, South Wales

Re: CB650Z racer

Postby ross_cheeks » Mon Jun 08, 2015 3:09 pm

also what did you use to detail the engine letters?

hocus82
Posts: 47
Joined: Thu Jun 19, 2014 12:23 am
Location: Norway

Re: CB650Z racer

Postby hocus82 » Tue Jun 09, 2015 4:34 am

ross_cheeks wrote:Lovely looking bike, what exhaust you running? I'm a sucker for a set up like that, its all about the symmetry of twin cans

ross_cheeks wrote:also what did you use to detail the engine letters?


Thanks man. Exhaust is stock up to where they angle upwards. Cut and welded on the upsweep. Cans are from Cone Engineering. Sound very good, although a bit loud for longer rides/high rpm.

The covers are detailed with your off the shelve spraypaint. Filled the recesses with a small brush and wiped off the excess. Easy peasy.

The bike has gotten a new seat which I think looks much better and some decals on the tank. Will try to get a few pics taken this weekend.
1979 Honda CB650Z
1971 Honda CB750 K1

ross_cheeks
Posts: 19
Joined: Mon Oct 06, 2014 9:36 am
Location: Aberdare, South Wales

Re: CB650Z racer

Postby ross_cheeks » Tue Jun 09, 2015 6:03 am

hmmm Ive got a 1980 Z but its got a 4-1 style system, would rather a twin can set up though

*Edit

Just actually bothered to look and it appears i have the same set up


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