Author Topic: 1971 CB500K0 Resto 3/71 VIN 1000896  (Read 47808 times)

Offline AshimotoK0

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #240 on: September 07, 2016, 04:56:22 PM »
On my barrels (no fin damage) One bore  is worn, the other three are OK. There is a slight ridge at the top of the bore (definitely not hard carbon deposit) but its not only at the front (thrust) side but 90° to that too. It's been suggested that I examine the con-rod, wrist (gudgeon) pin  and piston to see if there is evidence of a slightly bent con-rod but I can't detect anything untoward on any of these components. One possibility is that the bore with damage had a broken ring and may have run with it in that state for some time if it did. Any ideas? I am going to measure the ring grooves in the offending piston tonight.

Already got +0.25 piston kits but unsure if it may need more than that now .. the reboring company is investigating.

Anyone got a spare 500 liner that's standard bore either decent or re-borable to +0.25 I can buy, if I end up needing one?

BTW if anyone ever wants a similar 750 liner I have quite a few.
“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 CB500K0 Resto 3/71 VIN 1000896
« Reply #241 on: September 07, 2016, 09:56:19 PM »
Ash do you have liners for k0 barrels?
pete

Offline AshimotoK0

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #242 on: September 07, 2016, 11:07:24 PM »
Ash do you have liners for k0 barrels?
pete

yes the ones that were originally  in my K0
« Last Edit: September 08, 2016, 08:58:14 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 CB500K0 Resto 3/71 VIN 1000896
« Reply #243 on: September 08, 2016, 08:56:20 AM »
Someone posted this in not so good English on the USA site:-

have you got a hydro Lock..or overfloted cylender at any time.?
..a Loose jet can drovn one cylender ,and vash all lube aut..so it vear faster then the rest
...lean running can do somthing like..and give a blocked piston..vho overloadet the rod(sleigtly bend)..but not broke it/...


My re-traslation of this bit :  A Loose jet can drovn???  one cylinder ,and Wash all lube out ..so it wears faster then the rest.  drovn??  = possibly drain/drown

There may be something in that as the dome on the head and the top of the piston had whitish deposits on them. The other three were normal appearance for a 21k miler.

Looked at piston ring grooves last night and not excessively worn

 Unfortunately, I never got the original carbs with the bike to examine the jets. James ?  any comments?
« Last Edit: September 08, 2016, 09:01:36 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 JamesH

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #244 on: September 08, 2016, 01:55:46 PM »
Ash - have a feeling the carbs were completely gummed up / full of shyte, which is why I supplied a better set to you. Sadly no way to correlate the two. Did you get my message re the 0.75 NOS pistons and rings I have ? Give me a call as I'm at home with Will who's poorly today.

Offline Bryanj

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #245 on: September 08, 2016, 04:46:41 PM »
I think he meant "drown" and i had a ford 3.0 v6 that seized a piston due to a carb diaphragm going and petrol washing all the oil from the relevant bore, checking a rod for twist and bend is easy if you have the correct kit, I have a couple of spare rods, not sure on codes, if you want one ash

Offline UK Pete

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #246 on: September 08, 2016, 04:59:12 PM »
Ash do you have liners for k0 barrels?
pete

yes the ones that were originally  in my K0

what are they like ash, oh and did you get my payment
pete

Offline AshimotoK0

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #247 on: September 08, 2016, 08:34:27 PM »
Sorry Pete ..yes got the payment ta !

I think they are slightly ridged at the top as they had done 46k miles ! I can bung a ring in them and measure the change in gap, top to bottom if you wish . I got some minters with pistons for 50 quid from actually going to DK, going through their stock and haggling for cash.
“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 CB500K0 Resto 3/71 VIN 1000896
« Reply #248 on: March 31, 2020, 10:17:49 AM »
Well it's been a long time in hibernation due to work commitments but mainly  many other projects coming my way like a CB72, Bomber, CD175A sloper, S90 and a 61 CB92 but this lockdown made me think it's time to finally put the early CB500K0 engine together.

Problem is, I planned to blank off all of the apertures in the crankcases after reassembling them bare and then bead blasting the outsides at work.....but that's not going to happen, as we are closed down where I work 3-days/week and I have no access to the bead blaster or a paint baking oven.

So it's back to the way I used to do it yonks ago with paint stripper, wire wheels, pressure washer, Dremel etc but at least I have big enough ultrasonic cleaner that I can get each case half into it to give the cases a deep clean and hopefully get rid of any residual oil in the pores. I got that ultrasonic cleaner from the skip at work and managed to fix it and it's proved invaluable.  Will keep you posted  but been working on it for a day and a half now cleaning the cases on and off. There is still light brownish staining inside the cases but I may have to live with that unless anyone has a chemical method of stripping it. I do have a 4l tub of nasty hydroflouric acid based alloy cleaner but I will only use that as a last resort.

The bottom end of this engine was in really nice condition apart from the cage inside the countershaft bearing breaking up and the oil guide B damaged, a rubber component, being torn. Julie& Trigger have kindly found me an oil guide and I bought the correct NOS --323--- needle roller bearing from DS and I got the other gearbox needle roller bearing (a --286-- CB250/350K part) NOS from Dave Ayesthorpes stuff.

I have been through my spares and managed to put together a full oil seal kit (thanks Bryan .. I got most of those from you) and I must have bought both of the primary shaft bearings ages ago plus the needle roller assembly in the primary drive ages ago from Yamiya via my mate Chris in Japan. Also fitting a new primary & cam chain plus the 8 damper rubbers and cam chain guides for good measure. The countershaft looked OK initially but the failing needle roller bearing had in fact marked the shaft.. I have two spares to look at , one I got from an autojumble for £1 (plus a kickstart shaft complete for £1) and the other Bryan kindly gave me ages ago when I went down to see him.

One  thing I need to fit is the 'Plate Oil Guide' as it was missing from my early engine, as predicted by Trigger (see diagram).

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My paintwork in the correct Candy Jet Green /black was done by Menno ages ago (superb job) and is safely tucked away in my loft. All of the fasteners have been BZP plated .. Frame was painted last year and fork bottoms polished plus original wheel rims replated and hubs satin polished but not lacquered yet. A place in Coventry, who are normally mega expensive, took on my rear mudguard and rear lamp bracket and made a really nice job at a brilliant price as a 'Stafford Show' deal. But when JamesH contacted  them about rechroming some  rims, sadly their quote  was very expensive. They also did my mega rare K0 chrome fork ears but I had stripped and prepped them myself with repairs to holes/dents done in high silver content silver solder. Dave Ayesthorpes stuff provided me with  NOS reflectors/rubbers  and fork genuine fork gaiters. OddJob kindly sold me a pair of new side panel badges.

My barrels were rebored to +0.25 by Trigger and I got CB125S pistons and 323 rings NOS for them ages ago.

 
« Last Edit: March 31, 2020, 10:21:16 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 Bryanj

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #249 on: March 31, 2020, 12:41:07 PM »
Ash, i have to take the son to hospital tomorow for his infusion(crohns) and as my lockup is just round the corner i will have a look for that plate, i know i had 90% of an early clutch upgrade kit but its a while ago since i looked for it.
Anything else while im there mate?

Offline AshimotoK0

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #250 on: March 31, 2020, 01:26:40 PM »
Ash, i have to take the son to hospital tomorow for his infusion(crohns) and as my lockup is just round the corner i will have a look for that plate, i know i had 90% of an early clutch upgrade kit but its a while ago since i looked for it.
Anything else while im there mate?

Please don't risk your lads health Bryan .. I think Woodside may have a plate anyway.
“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 Nurse Julie

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #251 on: March 31, 2020, 01:41:42 PM »
Why didn't you ask me for one Ash, I could have put it in with the other bits. 🤔🤔
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
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Offline AshimotoK0

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #252 on: March 31, 2020, 01:45:09 PM »
Why didn't you ask me for one Ash, I could have put it in with the other bits. 🤔🤔

Sorry Julie ..I didn't realize I still need one till earlier today... I found my bearing retainer half ring so I will let you have other one back.
“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 Bryanj

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #253 on: March 31, 2020, 03:25:53 PM »
No risk mate, i drop him off at door, garage is isolated and i collect him when he rings

Offline AshimotoK0

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Re: 1971 CB500K0 Resto 3/71 VIN 1000896
« Reply #254 on: March 31, 2020, 05:43:04 PM »
No risk mate, i drop him off at door, garage is isolated and i collect him when he rings

I think I am OK for bits at the minute Bryan but as always appreciate your kind help.
“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.

 

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