250r piston help

[jonolanracin]

I have a cylinder and the piston is a 68.25 and i thought 68.00 was all you could go so is this a big bore cylinder it loks like there is plenty of room to be bored out more

[Queef Chief]

I was thinking 69.5 was max on stock bore, but i could be mistaken.

[John Tice]

Check Wiesco.com



John Tice
503-593-2908 Alternate 541-508-3944
www.smallenginemachineworks.com & www.nwsleeve.com
Turning Custom Cylinder Sleeves Since 1971

[Queef Chief]

My '86 is currently at 69mm, and the Wiseco catalog I ordered from went to 69.5mm.

[jonolanracin]

Ok thanks for the info ive had no luck finding a 68 75 piston yet

[John Tice]

You won’t ordinarily find Wiesco pistons with .25 or.75mm increments. Wiesco traditionally only supplies pistons in .5mm increments. .25mm steps doubles their inventory & probably wouldn’t increase their sales.

John Tice
503-593-2908 Alternate 541-508-3944
www.smallenginemachineworks.com & www.nwsleeve.com
Turning Custom Cylinder Sleeves Since 1971

[John Tice]

You won’t ordinarily find Wiesco pistons with .25 or.75mm increments. Wiesco traditionally only supplies pistons in .5mm increments. .25mm steps doubles their inventory & probably wouldn’t increase their sales.

Many times a worn cylinder, especially a 2 stroke won’t clean up with a .25mm oversized piston.

John Tice
503-593-2908 Alternate 541-508-3944
www.smallenginemachineworks.com & www.nwsleeve.com
Turning Custom Cylinder Sleeves Since 1971

[jonolanracin]

Thats why i wanted the .75 im at 25 now and i dont want to buy a 50 and not be able to use it

You won’t ordinarily find Wiesco pistons with .25 or.75mm increments. Wiesco traditionally only supplies pistons in .5mm increments. .25mm steps doubles their inventory & probably wouldn’t increase their sales.

Many times a worn cylinder, especially a 2 stroke won’t clean up with a .25mm oversized piston.

John Tice
503-593-2908 Alternate 541-508-3944
www.smallenginemachineworks.com & www.nwsleeve.com
Turning Custom Cylinder Sleeves Since 1971

[John Tice]

If you take your cylinder to a reliable shop & have it properly measured, maybe a .25mm step is all you need to clean up the bore. Send the cylinder to me if you can’t find anyone closer.
I’ve got no idea of how you are measuring the bore but you might be better of to let the cylinder boring man do your measuring.


John Tice
503-593-2908 Alternate 541-508-3944
www.smallenginemachineworks.com & www.nwsleeve.com
Turning Custom Cylinder Sleeves Since 1971

[freewheeler]

You won’t ordinarily find Wiesco pistons with .25 or.75mm increments. Wiesco traditionally only supplies pistons in .5mm increments. .25mm steps doubles their inventory & probably wouldn’t increase their sales.

Many times a worn cylinder, especially a 2 stroke won’t clean up with a .25mm oversized piston.

Interesting info, from an engine builder.

http://www.ebay.com/sch/i.html?_from...o+.75&_sacat=0

http://www.ebay.com/sch/i.html?_odkw...o+.25&_sacat=0

[John Tice]

Great finds for oddball Wiesco piston sizes; any of us who does business with Wiesco on a regular basis knows that these .25mm & .75mm piston sets are unusual situations. Just because these particular pistons are found in the 1/4mm dimensions don’t expect to find them for your machine. The early model pistons which are packaged in a Blue box; these are cast pistons with brittle moly filled iron ring sets. Please avoid this type of piston for high performance applications.
For any of you who doubt this; ask for Ron or Al in the power sports section. 800-321-1364

John Tice
503-593-2908 Alternate 541-508-3944
www.smallenginemachineworks.com & www.nwsleeve.com
Turning Custom Cylinder Sleeves Since 1971

[onformula1]

You won’t ordinarily find Wiesco pistons with .25 or.75mm increments. Wiesco traditionally only supplies pistons in .5mm increments. .25mm steps doubles their inventory & probably wouldn’t increase their sales.

Many times a worn cylinder, especially a 2 stroke won’t clean up with a .25mm oversized piston.

John Tice
503-593-2908 Alternate 541-508-3944
www.smallenginemachineworks.com & www.nwsleeve.com
Turning Custom Cylinder Sleeves Since 1971

I think the key word is in this sentence- You won’t ordinarily find Wiesco pistons with .25 or.75mm increments

[Jmoozy27]

Interesting info, from an engine builder.

http://www.ebay.com/sch/i.html?_from...o+.75&_sacat=0

http://www.ebay.com/sch/i.html?_odkw...o+.25&_sacat=0

Do you come on here just to criticize people?

[onformula1]

Do you come on here just to criticize people?

Unfortunately, John doesn't get the same play here as he does at E2S, where he is like a cylinder god and gets huge props.

(Some) Guys he has been building cylinders for what? 44 years!, he knows what he is talking about, embrace him and learn, I have been building engines for 30 years, I have learned a lot from him, you can too, he is willing to teach us all the tricks and asks for nothing in return, he has even offered free work to help people out. This man should have a "Star" next to his screen name.

(And no I have never shook his hand, just a fan)

Nitric Acid 69.5% Cleanroom LP, Thank You John!

[ironchop]

Unless you are beating your own drum around here nearly every minute, some folks mistake humility for ignorance. They also mistake arrogance for wisdom.

I guess I need to get a membership over at E2S. I didn't even know about the place until recently.


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