Author Topic: 1971/2 CB175K5 Twin (360 crank)  (Read 2542 times)

Offline AshimotoK0

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1971/2 CB175K5 Twin (360 crank)
« on: December 10, 2015, 12:02:56 AM »
Bought this CB175 K5 along with the CB500K0 from J .

Piccies  here as bought ....

https://www.dropbox.com/sh/ol3rlpyu528gd4z/AABX8aoGDneJgjVL7w46U312a?dl=0

Lovely patina , dodgy bars but I have some rechromed UK style CB250K0 ones that I am hoping will fit. RGP750 is checking as he has a UK CB175K6.

All my mates, mates mates etc. want to buy this bike ! Never realized they are so popular.

As soon as I bought it I went  straight on Yahoo.jp and bought some much nicer pipes .. they are in Chris in Japan's 'Man-Shed' in the Land of the rising Yen still though.
Got some NOS shocks for it last year as I thought they would fit a CB250K .. they didn't. Not that the ones on the bike are bad.

Carbs were totally gummed up from standing. Going to dunk in methylene Chloride (look away Julie ;D) and then hot ultrasonic clean them. Both carbs had the plate/clip missing 11 in diagram attached so needles would have been free to float about. Exactly the same fault as my first bike at 17 had, when I bought it,  a C200 90cc 'sports'

Anyway the only real problem is that the kickstart does not turn the engine over. Removed the clutch cover ... bloody difficult 'cos PO had bonded the gaskets with what looked like Araldite. That combined with the dreaded silicone sealant on the cam cover plus the fact the bike had been standing and access to the kickstart gears means splitting the crankcases, made me decide to totally strip the engine. Cam, cam bearings, followers, rollers, head, barrels and pistons all looked great with no obvious wear. Separated cases after finding a 'hidden' M8 bolt which can only be accessed by removing the oil drain plug .. "when all else fails read the manual". All of the gears, crank, bearing etc looked fine. BUT kickstart gears look totally sha**ed ,, God knows where the missing gnashers went... possibly into the centrifugal oil filter, as I have not removed the cover from that yet. Surprisingly, I can't see that is't damaged any other components but I will have to examine the crank and gears closely. Plain brass bushes on at least one gearbox bearing in this engine .. not needle rollers.

So back to the 500K0 / 750K0 until I get, at least, replacement kickstart gears, gasket set and camchain. Going to leave the rest of the bike as it is. It would be criminal IMHO to lose that lovely patina.

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« Last Edit: December 15, 2015, 10:22:10 AM by AshimotoK0 »
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Online Rozabikes Tim

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Re: 1971/2 CB175K4 Twin (360 crank)
« Reply #1 on: December 10, 2015, 12:27:02 AM »
Very nice Ash. Intrigued by thread title referring specifically to 360 degree crank. Were there other versions?
One day I'll have the time to restore it, not just talk and dream....

Offline AshimotoK0

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Re: 1971/2 CB175K4 Twin (360 crank)
« Reply #2 on: December 10, 2015, 12:45:59 AM »
Very nice Ash. Intrigued by thread title referring specifically to 360 degree crank. Were there other versions?

No there wasn't sorry to be confusing.. it was just to denote it's a buzzy engine. There was a 250K though but only in Japan with a 360 degree crank though ... JDM only the CD250 !
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline UK Pete

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Re: 1971/2 CB175K4 Twin (360 crank)
« Reply #3 on: December 10, 2015, 06:55:37 AM »
great little bike ash

Offline Chrisjapan

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Re: 1971/2 CB175K4 Twin (360 crank)
« Reply #4 on: December 10, 2015, 09:27:14 AM »
Lovely bike, looking forward to following this, and of course considering how to bring the pipes over, might have to visit....
Honda Ape 50cc
Honda CB350
But I do have a real soft spot for a BMW R27 my birth year - whoops shouldn't have said that here.

Offline AshimotoK0

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Re: 1971/2 CB175K5 Twin (360 crank)
« Reply #5 on: December 10, 2015, 09:51:13 AM »
Lovely bike, looking forward to following this, and of course considering how to bring the pipes over, might have to visit....
Always welcome Chris ...you know that .. you can bring me some nice Teryaki sauce over. ;D ;D

« Last Edit: December 15, 2015, 10:21:38 AM by AshimotoK0 »
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline AshimotoK0

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Re: 1971/2 CB175K5 Twin (360 crank)
« Reply #6 on: December 15, 2015, 10:21:48 AM »
Nobody has picked up on my Boo Boo ... It's a K5 model not a K4  ;D
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline Green1

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Re: 1971/2 CB175K5 Twin (360 crank)
« Reply #7 on: January 03, 2016, 12:12:42 AM »
Love the little cb175 I'm still on the look out for a cl.

Can't belive I didn't see this.When did you start working on your bikes Ash.
Ralph will be pleased  you put your books down.  ;D

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Honda CB750k1 Candy Gold
Honda CB550k Candy Jade Green
Honda CG125
Aprilia Pegaso 650
Moto guzzi 1200 sport
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