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Reboring cylinder and fitting a piston query?

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spetom
Trackday Trickster



Joined: 30 Aug 2010
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PostPosted: 18:44 - 18 Oct 2010    Post subject: Reboring cylinder and fitting a piston query? Reply with quote
I'm looking at a knackered oil drinking CB350 twin with horrendous mileage on it. I'm looking to do a total refit on it.

Trouble is I can't find a piston for it? Ebay, google, forums etc. all exhausted.

Read somewhere that you could have the cylinder rebored by about 1/2 a mm or something smaller like that and then have a non OEM piston put in?

I'll be calling my local mechanic tomorrow, but before I do wanted to ask is the above at all feasible?
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GeneralXcepti...
Nova Slayer



Joined: 03 Sep 2008
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PostPosted: 19:02 - 18 Oct 2010    Post subject: Reply with quote
I'm not familiar with the CB350 but isn't this what you're looking for?

https://cgi.ebay.co.uk/nos-honda-cb350-cb350k-genuine-pistons-/370385912620?pt=UK_Motorcycle_Parts&hash=item563cb8832c#ht_500wt_922

To answer your question, if the cylinder hasn't already been bored out you should be able to get it bored out to fit an oversized piston.

It's probably cheaper to get a 2nd hand engine - these are all £150 + delivery

https://cgi.ebay.co.uk/Honda-CB-350-S-Engine-144-/110558750156?pt=UK_Motorcycle_Parts&hash=item19bdd0a5cc
https://cgi.ebay.co.uk/Honda-CB-350-S-Twin-Engine-Complete-24-/110558750237?pt=UK_Motorcycle_Parts&hash=item19bdd0a61d
https://cgi.ebay.co.uk/HONDA-CB350-S-ENGINE-YEAR-1987-/370396686465?pt=UK_Motorcycle_Parts&hash=item563d5ce881

Cheers
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spetom
Trackday Trickster



Joined: 30 Aug 2010
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PostPosted: 19:43 - 18 Oct 2010    Post subject: Reply with quote
GeneralXception wrote:
To answer your question, if the cylinder hasn't already been bored out you should be able to get it bored out to fit an oversized piston.


Yea this is what I thought no the engine hasn't already been bored out. Any idea how I should go about this? Are there stock Honda pistons of different sizes?

If it's drinking oil it must be the piston and cylinder wear right?

Had a look at those old engines already, they look in very bad condition and probably have as many miles as the bike I want to refit.

Last edited by spetom on 20:04 - 18 Oct 2010; edited 1 time in total
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neatbik
World Chat Champion



Joined: 27 Jun 2007
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PostPosted: 20:01 - 18 Oct 2010    Post subject: Reply with quote
As said above, yes, you can overbore it and fit oversize pistons - as long as its not been done to within an inch of its life already.

You can get oversize pistons that go up in quarter millimeter increments.
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spetom
Trackday Trickster



Joined: 30 Aug 2010
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PostPosted: 20:04 - 18 Oct 2010    Post subject: Reply with quote
beatnck2 wrote:
As said above, yes, you can overbore it and fit oversize pistons - as long as its not been done to within an inch of its life already.

You can get oversize pistons that go up in quarter millimeter increments.
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Ok thanks, appreciated.
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neatbik
World Chat Champion



Joined: 27 Jun 2007
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PostPosted: 20:09 - 18 Oct 2010    Post subject: Reply with quote
Best thing is have a look at the bores and pistons, measure them for wear and that will give you an idea of why its drinking oil.

Off the top of my head im not sure where to buy the pistons (i have never had to buy any) but im sure they will be available somewhere.

Have you called David Silvers? Quite often they have 'new old stock' in the stores that they dont have listed on the website.
i found a pair of rims for a CB125 for £20 each that way.
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