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Author Topic: 550K big bore kit  (Read 2141 times)

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Offline juice

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550K big bore kit
« on: January 30, 2011, 01:41:35 PM »
Anybody knows where they can be found??
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Offline crazypj

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Re: 550K big bore kit
« Reply #1 on: January 30, 2011, 03:33:27 PM »
I used modified CB750 pistons when I did mine
Kit's were not easily available in late 70's Britain
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Offline bryanj

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Re: 550K big bore kit
« Reply #2 on: January 30, 2011, 08:52:39 PM »
Try 605 kit for the 500, sometimes on ebay
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Offline juice

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Re: 550K big bore kit
« Reply #3 on: January 31, 2011, 08:07:50 AM »
Crazypj, yeah i'm looking for a complete kit, i'm not in the mood to bring pistons to a machineshop. What do you mean by britain??

bryanj, i've been looking on ebay but never found anything...maybe i'm just unlucky
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Offline q2418130103p

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Re: 550K big bore kit
« Reply #4 on: January 31, 2011, 02:47:42 PM »
CHeck your PM's
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Offline juice

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Re: 550K big bore kit
« Reply #5 on: January 31, 2011, 04:07:48 PM »
no pm received
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Offline q2418130103p

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Re: 550K big bore kit
« Reply #6 on: January 31, 2011, 04:11:50 PM »
how about now?
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Offline crazypj

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Re: 550K big bore kit
« Reply #7 on: February 01, 2011, 01:12:06 AM »
Quote from: juice on January 31, 2011, 08:07:50 AM
Crazypj, yeah i'm looking for a complete kit, i'm not in the mood to bring pistons to a machineshop. What do you mean by britain??


 I mean I did mine in Britain, in 1978 (then rode the hell out of it for 70,000+miles.)
 It's still there, I'm not
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Offline juice

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Re: 550K big bore kit
« Reply #8 on: February 01, 2011, 10:53:14 AM »
q2418..... received, thanks i'll contact

pj ok i get it. did you resleeve or just bumped the CR??
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Offline mlinder

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Re: 550K big bore kit
« Reply #9 on: February 01, 2011, 10:57:10 AM »
Quote from: juice on February 01, 2011, 10:53:14 AM


pj ok i get it. did you resleeve or just bumped the CR??

What do these two things have to do with each other?

/edit: also, there is only a 2.5mm difference between the bores of the 550 and 750, which I believe is within boring limits of the 550 sleeves.
« Last Edit: February 01, 2011, 11:02:32 AM by mlinder »
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Offline crazypj

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Re: 550K big bore kit
« Reply #10 on: February 02, 2011, 12:13:42 AM »
mlinders right, just bore it for 750 pistons.
 You have to fit liners for 1mm over 750 pistons, if I was doing it now I would get a CB750 block and remove liners then bore 500/550 block for oversize liners
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Offline q2418130103p

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Re: 550K big bore kit
« Reply #11 on: February 02, 2011, 04:20:01 AM »
Quote from: crazypj on February 02, 2011, 12:13:42 AM
mlinders right, just bore it for 750 pistons.
 You have to fit liners for 1mm over 750 pistons, if I was doing it now I would get a CB750 block and remove liners then bore 500/550 block for oversize liners

While this sounds a bit odd to me, I believe that many people bor ethe 550 liners for 750 pistons, but rpelace 500 liners for 750 pistons.  Apperently they are different liners?
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Offline crazypj

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Re: 550K big bore kit
« Reply #12 on: February 03, 2011, 09:05:22 AM »
500 liners are thinner and won't bore to 61mm. 550 is OK at 61mm but won't 'take' 62mm without liner distorting when it gets hot.
 It works, but not as well as it could
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Offline Ricky_Racer

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Re: 550K big bore kit
« Reply #13 on: February 03, 2011, 01:40:14 PM »
Quote from: crazypj on February 02, 2011, 12:13:42 AM
... if I was doing it now I would get a CB750 block and remove liners then bore 500/550 block for oversize liners

PJ, what issues are involved in doing this in a 550 cylinder block? Thanks a ton!  RR

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Offline crazypj

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Re: 550K big bore kit
« Reply #14 on: February 03, 2011, 10:13:12 PM »
put both blocks in oven, wait for clank when they get hot enough to release liners
 Let everything cool down and  measure inside of 750 block and bore 500/550 block to same size (or give it 0.003" smaller than liner)
 Sell 750 bare block to anyone who is doing a  big bore kit
easy peasy lemon squeezy  ;D
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