Author Topic: 1971 CB500K0 Resto 3/71 VIN 1000896  (Read 34391 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.

Online Jamesh_sussex

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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.