Wiseco 2001 series pistons

Going through some old boxes, is there still any use for the wiseco 2001 series pistons anymore 2001PS , 2001P6, 2001P8....... These are the ones with long skirt and Dykes "L" Ring .
I have cut the skirt down on the mill close to what the new pistons look like and it ran fine. As far as running it with the long skirt I am not sure how it compares to the new series

PD Power

New member
When you say "long skirt" is this perfectly round and even all the way around the skirt?
A primary value of the modern piston is that it is not truly round. It is slightly oblonged
and where the wrist pin is located the piston us not undercut.
Not a great explanation, but I hope you understand it. .......PD
Those are good pistons, it's just that their pin height is not correct for the longest rods. Part of the reason the skirts were long was because the shorter rod had the piston rocking a little more. And no, they weren't round , they have a taper from under the ringland to the bottom of the skirt of about .003
Some were also what is called, "Cam ground", which means that the dimension in the pin boss area is slightly less than across the front and back.


New member
the wiseco dykes ring pistons are great ! seal great last long , do you have any for cool bore cylinders? if so what rod length are they for ? / i was hunting that type of piston several years ago and all i could find was ones for std length rod and for steel bore block (picked up 2 anyway) do you have one for 4.500 rod cool bore .060,.080,.100 oversize // any coolbore for 3.875 rod length dykes ring


New member
i just got out a very old catalog to help my recall wiseco2001ps thru p8 is the piston made for a tecumseh HS40 but can be used in a briggs with a 4 inch rod with 9/16 wrist pin std is like .082 when you put it in a briggs i have a 2001ps now , i called horstman and had them cut a 9/16th pin hole then you must use a 4HP briggs crankshaft , some of the very early open briggs were built like this some folks even used the HS40 tecumseh pistons with 4hrb-10 horstman rod in a briggs
Bluebullet, you could have your aluminum cylinder Nikasiled and then you wouldn't need the chrome plated pistons that will scuff your cylinder. You will also never have to bore it again once plated.


New member
hello Brian . that sure would be nice to have Nikasiled cylinder on a briggs flathead , i have one of the new COPPERHEAD 135cc engines by U.S MotorPower it has a coating like that , ( this engine is much inproved version of the older U,S-820) beefed up block redesigned ports PVL ign. rare earth magnet flywheel ,HR-191 tilly carb single ring dome piston , better cyl head new designed overhead pipe , I did race the briggs and tecumseh flathead OPENs for a long time . had lots of fun raceing them ! i still have some good opens ,also briggs stock apearings I just could not part with them Flatheads ! but when these Clones and other OHV came it , I have gone back to 2cycles less parts insted of more (rocker arms ,pushrods and such) i sure wish i had one of them BULLER Built 2 cycles ! heck i like all the karts and engines from all the eras , i still have some McCullochs from my 1st race kart. I got some 91 B-1 s runnin for fun. i wonder how much they charge to coat a briggs cylinder? lots of cycles have that Nikasil coating nowdays very good way to go for sure !
I would think it would be cheaper to just put a steel sleeve in that cool bore than to send it out for the nikasil . The nikasil
requires special ( expensive ) honing stones for sizing the bore . With the steel sleeve you can use a non chromed piston .