Overbore worth it? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 06-17-2014, 11:37 AM Thread Starter
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Overbore worth it?

Just got a newish rear jug for 30 dollars shipped. Nice!

Before I shop for Pistons and rings, should I consider boring out 1mm? I understand that technically there will be more power but is the increase noticeable? Is it worth spending the money on the machine work?
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post #2 of 11 (permalink) Old 06-17-2014, 11:51 AM
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IMHO not really. You really won't notice it. The only reason to do it is if your cylinder walls are jacked up.

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post #3 of 11 (permalink) Old 06-17-2014, 12:21 PM
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Originally Posted by M_Angell View Post
IMHO not really. You really won't notice it. The only reason to do it is if your cylinder walls are jacked up.
X2, BTW you do not bore this assembly oversize. You hone it oversize.
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post #4 of 11 (permalink) Old 06-18-2014, 02:40 AM
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X2, BTW you do not bore this assembly oversize. You hone it oversize.
for once i agree with you wm

if you think it needs to be honed just give it a light and quick hone then mic it out and you will probably still be within specs for standard size rings

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post #5 of 11 (permalink) Old 06-18-2014, 06:30 PM Thread Starter
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Got it. The new jug has been ball honed already, so I only need a honed rear or a rear jug and ball honer
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post #6 of 11 (permalink) Old 06-18-2014, 07:07 PM
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I am wondering how big can you go?30 40 60 over?
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post #7 of 11 (permalink) Old 06-18-2014, 07:08 PM Thread Starter
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As big as you want before you run out of sleeve material - but don't expect it to run long
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post #8 of 11 (permalink) Old 06-18-2014, 11:50 PM
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I say bore it out to a VN800 bore, and slap them 800 pistons in....then run her up to like 110mph....see how she runs....



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post #9 of 11 (permalink) Old 06-19-2014, 12:59 PM
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I am wondering how big can you go?30 40 60 over?
I AM NOT SURE, but I believe you can get cylinder kits for 1mm. .039". The only available I have heard of and common among modern stuff.
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post #10 of 11 (permalink) Old 06-19-2014, 09:46 PM
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I AM NOT SURE, but I believe
Thanks fer using that phrase...more should...kudos to to....



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