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Discussion Starter · #1 ·
hello,i want to bore my 96 xcr 600 ,i just dont know any thing about boreing.so how much to bore (like .20 or .30)and if i do that can i use the same heads or do i have to get diff heads.,,,,thanks

96 xcr 600
premix
slp pipes
x10
 

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Owned a '96 600xcr monoblock/single pipe back then, wish I kept my '94 xlt sks until I bored it out 1mm and installed SLP billet heads and it was stronger than it was stock and dead reliable afterwards. Dropped the needles one from top and it finally had better fuel economy than it did new and wasn't as finicky running. If I were to own one again I'd buy an XLT with 34mm carbs, way better.
 

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A couple things....

Boring a cylinder to an available typical oversize piston size is not called "big bore", "big bore" is when you swap in pistons from a different motor, or make new ones, creating a substantially larger motor displacement..

Sled bores are measured in MM, so typical over-bore sizes are .5mm, and 1.0mm.

I believe that pistons are available for that motor in .5mm overbore, and you can use your stock heads. I'll have to reference my parts catalog to be sure.
 

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Discussion Starter · #4 ·
like i said iam new to this.but thanks for the info tho.i was looking up on the web at pistons they had some like .20 over. so how to know how many mm that is to bore.??????
 

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You are not going to gain anything compared to how much you spend in boring it. boring a cylinder should only be done to correct damage. boring a cylinder as said above is NOT the same as doing a big bore. youre gonna have several hundred bucks in boring it and gain a horse power or 2?! and then when you do blow it up and do NEED to go oversize you may not have any sizes available.
if youre moter needs it-bore it. if its running fine leave it alone.
but if you do bore it you dont need to alter heads.
 

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There's actually 3 overbore piston sizes available for that motor.. .5mm, 1.0mm, and 1.5mm - listed piston prices are included

boring 0.5mm (.0196inch) over, you'll gain 9.2cc's displacement and a maximum of 1.6 horsepower. (~$150 SPI piston set / $375 Wiseco piston set)
boring 1.0mm (.0393inch) over, you'll gain 18.5cc's displacement and a maximum of 3.3 horsepower. (~$412 Wiseco piston set)
boring 1.5mm (.0590inch) over, you'll gain 27.9cc's displacement and a maximum of 4.9 horsepower. (~$412 Wiseco piston set)

Add to that the cost of a top end gasket set (~$60.00) and cost of machining.

You can probably gain more than that just by cleaning the clutches and carbs, and replacing the plugs, wires and caps..
 

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Ish, I would try to avoid Wiseco, I have heard some nasty things about them.
 

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I dunno where you've heard bad things Wiseco, they make a good piston.

They are just forged to make them stronger which makes them slower to expand, so you need to warm up the engine before pounding the pi$$ out of it...
 

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First of all, grab some muriatic acid, and clean the aluminum out of the cylinder. (use appropriate protection, it is acid)

After that:

If you can see scratches in the cylinder but not feel them, honing will be fine.

If you drag your fingernail across the scratch, and you can just feel the scratch, you can probably just hone it.

If your nail catches in the scratch, you need to have it bored.
 
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