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Discussion Starter #1
This is a link that you can find your exact engine displacement. All you need is the Bore and Stroke. Make sure you select the correct unit of measurments.

Calculate Engine Displacement
 

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That works pretty good.
or you can do it the old fashioned way.... bore X bore X stroke x .7854
example:
74.00mm piston 57.3mm stroke (250X)
you move the decimal left one number.
7.4 X 7.4 X 5.73 X .7854 = 246.4387 CCs
 

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or you could just ask 300powered by monster
 

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Discussion Starter #5
LMOA... a 282cc bored out .030 is a 330cc, right????
 

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EXACTLY!! but you can swap in for an 85mm piston and have 385CCs..Lmao but 30 over is all you need to hang with a 450R
 

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i have a 350 honda trxtm i was ridding it just cut off could a coil go bad like that i did pull plug and turn it over look at plug no spark some one help
 

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i have a 350 honda trxtm i was ridding it just cut off could a coil go bad like that i did pull plug and turn it over look at plug no spark some one help

Welcome to the forums.... CHeck for anything that may have came unplugged. or a blown fuse. a coild could quit without warning but generally they will work when cold and when they get hot they start to fade away.
 

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Lol even boring my 250ex to 69.4 mm only makes it 235cc

You are correct mister..lol you started with 229CC..lol long way from 250 huh
 

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Yea I know I dont understand that lol why call it a 250? call it a 230cc... but using that calculation with my stroke, 62.2 mm i believe, and the bore size 69.4 (biggest piston i found on bike bandit) it came out to be 235. but while typing this message it occured to me that that is just the piston size not the bore, but bore wont be far off lol
 
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robin13
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