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xr400 89mm bore re-sleeve?


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A friend took his cylinder and new 89mm wiseco piston to Honda dealer to bore. Was told you cant use the stock sleeve because they are,too thin. If you buy new a sleeve for big bore,am I to assume you have to remove stock sleeve from cylinder,bore id of cylinder larger,then press new sleeve in,then bore cylinder? If new sleeve doesn't have a larger od,what is difference,or is this what is needed to be done? Sorry,not up to speed on xr400 mods,always a wealth of knowledge here,and greatly appreciated!!!

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  • 3 years later...

yehh youd have to press the old sleeve out and machine to fit the new one.. might be cheaper to get an over sized cylinder all ready done.

https://www.ebay.com.au/itm/New-Honda-Sportrax-TRX400EX-XR400EX-Big-Bore-89mm-440cc-Cylinder-1996-2009/252350052028?hash=item3ac13c36bc:g:w~sAAOxyyq5TKaRW

as an example. good luck I hope you get it sorted.

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