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should I realy be wary of big bore?

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dandit
Nearly there...



Joined: 04 May 2004
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PostPosted: 20:09 - 08 Apr 2008    Post subject: should I realy be wary of big bore? Reply with quote
hi should I realy be wary of buying a bike with a big bore kit? this dyno print out is from one such bike that I want but what should I worry about??? can you guess what it is Very Happy
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WHAT DO YOU MEAN 100 MPH THATS IMPOSSIBLE I STILL HAD 3 GEARS TO GO OFFICER. Currently riding a naked cbr 600 and driving a 52 plate 2litre tdci mondeo
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5v3d3b0
World Chat Champion



Joined: 24 Sep 2006
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PostPosted: 20:21 - 08 Apr 2008    Post subject: Reply with quote
No I can't guess what it is just from being told 103 bhp, but I can tell you that big bore kits are usually short lived
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 20:24 - 08 Apr 2008    Post subject: Re: should I realy be wary of big bore? Reply with quote
dandit wrote:
hi should I realy be wary of buying a bike with a big bore kit? this dyno print out is from one such bike that I want but what should I worry about??? can you guess what it is Very Happy


We can't tell you if you should be wary unless you tell us what bike it is! Smile
____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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dandit
Nearly there...



Joined: 04 May 2004
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PostPosted: 20:29 - 08 Apr 2008    Post subject: Reply with quote
bandit 600 750 topend bored to 998 i think he said with some work from chris meyhew
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WHAT DO YOU MEAN 100 MPH THATS IMPOSSIBLE I STILL HAD 3 GEARS TO GO OFFICER. Currently riding a naked cbr 600 and driving a 52 plate 2litre tdci mondeo
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sickpup
Old Timer



Joined: 21 Apr 2004
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PostPosted: 21:30 - 08 Apr 2008    Post subject: Reply with quote
BLUEX5 wrote:


The bottom end will handle it as it hewn from granite itself. As to the rest of it - who knows?



Agreed but the boring out of the cylinder to fit the new liners often causes warping and heat transfer problems.
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dandit
Nearly there...



Joined: 04 May 2004
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PostPosted: 21:32 - 08 Apr 2008    Post subject: Reply with quote
sickpup wrote:
BLUEX5 wrote:


The bottom end will handle it as it hewn from granite itself. As to the rest of it - who knows?



Agreed but the boring out of the cylinder to fit the new liners often causes warping and heat transfer problems.
what about servicing would it be good idea to change oil more regular then
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WHAT DO YOU MEAN 100 MPH THATS IMPOSSIBLE I STILL HAD 3 GEARS TO GO OFFICER. Currently riding a naked cbr 600 and driving a 52 plate 2litre tdci mondeo
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faith183uk
Nitrous Nuisance



Joined: 15 Sep 2005
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PostPosted: 21:39 - 08 Apr 2008    Post subject: Reply with quote
Personally i think it means - bored out to 998 getting 103bhp = hassle not needed. Especially for 103bhp

Insurance would be a pain if you are honest, or if not honest, void

Bandit 1200?
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 22:43 - 08 Apr 2008    Post subject: Reply with quote
dandit wrote:
bandit 600 750 topend bored to 998 i think he said with some work from chris meyhew


Gonna have to raise the bullshit flag on that I'm afraid, unless you can fit 'busa pistons in a 750 block. It would have to be bored to 80.8mm
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 22:50 - 08 Apr 2008    Post subject: Reply with quote
Hmm, might be possible I guess (without actually knowing) with a 77mm bore 'J' block, but still would be bloody tight with marginal cooling. Boring an oil-boiler 5mm oversize won't make for a hugely reliable engine I would think.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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Timmeh
World Chat Champion



Joined: 01 Nov 2006
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PostPosted: 10:18 - 09 Apr 2008    Post subject: Reply with quote
Why don't you just buy a 1200.
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GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you
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dandit
Nearly there...



Joined: 04 May 2004
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PostPosted: 18:09 - 10 Apr 2008    Post subject: Reply with quote
Timmeh wrote:
Why don't you just buy a 1200.
find me a nice one for £1500 Laughing
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WHAT DO YOU MEAN 100 MPH THATS IMPOSSIBLE I STILL HAD 3 GEARS TO GO OFFICER. Currently riding a naked cbr 600 and driving a 52 plate 2litre tdci mondeo
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faith183uk
Nitrous Nuisance



Joined: 15 Sep 2005
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PostPosted: 01:02 - 11 Apr 2008    Post subject: Reply with quote
What like this one

https://cgi.ebay.co.uk/SUZUKI-BANDIT-1200_W0QQitemZ250233717347QQihZ015QQcategoryZ9808QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

This buyer got change at only £1300

https://cgi.ebay.co.uk/1998-SUZUKI-GSF-1200-BLACK-BANDIT-STREETFIGHTER_W0QQitemZ140222924784QQihZ004QQcategoryZ9808QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 10:48 - 06 May 2008    Post subject: Reply with quote
Hi

JE make 79mm pistons for the GSXR750 which might fit, but that is going to generate a hell of a lot of heat. Given that the 750 can easily make 100hp it is a lot of effort / expense to go to for little extra reward.

Easiest thing is to just drop in a GSXR750 engine. Or a 1200 Bandit engine (a touch more difficult).

All the best

Keith
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