What piston size would i need for a 65.72 bore?

**Velislide** · 10-03-2016, 05:06 PM

Instead of wrecking a 100$ piston, why not get a 40$ bore and do it right? Trying to save a dime will cost you in the end.

**DohcBikes** · 10-03-2016, 05:57 PM

Originally Posted by niftylittleguy

The bore i have is 65.72mm.

A properly measured bore uses a minimum of six values to "draw a picture" of the cylinder. I don't know what you used, or where you measured to get your 65.72mm, but you need to put the tools down and let a pro handle this.

**86T3** · 10-03-2016, 07:55 PM

You're here asking for advice, please accept it. Take the cylinder to a machine shop, let them measure it, bore it and get the appropriate piston.

**Mackus84** · 10-03-2016, 11:52 PM

Originally Posted by niftylittleguy

Micrometer i got off amazon.

Like a regular micrometer? Or a bore gauge? Cant trust the micrometer measurement because you have to measure different points throughout the bore. And a standard micrometer isnt going to "get down in there" like you need it to. I would take the advice of the guys here, a get a new piston and have the bore matched to it. They know what theyre talking about.

**Scootertrash** · 10-04-2016, 07:49 AM

M

Originally Posted by tripledog

This looks like a job for loganm, AKA "the piston whisperer".

SCORE!!!!!

I knew you'd seize the opportunity!

**oscarmayer** · 10-04-2016, 10:09 AM

wiseco no longer sells pistons in the .25mm sizes. it is only .5 now Honda did offer stock pistons in the .25 range and I think it was probably a stock piston at that size. that means you will want a wiseco 66mm and have it bored/honed to the piston once you have it.

**DohcBikes** · 10-04-2016, 02:17 PM

Originally Posted by oscarmayer

wiseco no longer sells pistons in the .25mm sizes. it is only .5 now Honda did offer stock pistons in the .25 range and I think it was probably a stock piston at that size. that means you will want a wiseco 66mm and have it bored/honed to the piston once you have it.

You're full of shlt oscar. I don't care how nice a guy people here are fooled into thinking you are, your mechanical advice is often wrong. Don't say unless you know. Nothing personal, of course.

Where's your friend Milner? He's scamming members here for thousands of dollars.

**RIDE-RED 250r** · 10-04-2016, 03:57 PM

Add me to the list of those advising to get the next size overbore piston, then send that new piston and cylinder to a reputable machine shop and have the cylinder bored to match the piston per the piston manufacturers specs. Don't just stuff "whatever fits" in there....

Do it right, do it once.

This isn't quantum physics.....

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