cut down piston?

[mk1rob]

iv just striped down my engine from my mk 125lc project ant the piston has been cut down / shortened the holes that should be on the piston wall are gone. what i want to know is why this has been done? what affects it will have? and will it make any kind of difference thanks rob

[proam350]

lot of people used to do it but in my thinking waste of time just get more piston rock in bore and less crankcase pressure for next to no power gains

[mk1rob]

yeah i agree iv never seen it before lol i think i will order a new 1 instead of putting this 1 back in. also the barrel has had the ports altered iam guessing for the piston would it affect it by putting a normal 1 back in?

[streamline350]

hi rob defo change the piston post up pic of port work but it wont bother it putting new piston in fella. what oversize you on as have a few piston kits also do alot of tuning so post up pic of cylinder then can see whos been in there if its a good job or not?

[mk1rob]

will get some pics up asap

[mk1rob]

here's some pics at the end there's 2 pics of the exhaust can any 1 tell me what make it is or is it a home made special lol there's no markings on it say what it is

[Norbo]

It was done on some proddy 250's asw ell

[streamline350]

thats a YZ125 PISTON DONT LIKE THE LOOK OF THAT PORTING MATE DONT LOOK TWO GOOD TO ME FELLA....

[streamline350]

JUST HAD A LOOK AT YER PIPE LOOKS ABIT LIKE A NIKON BUT NOT 100% ON THAT MATE

[proam350]

hi rob i think streamlines right that looks like a yz piston to me aswell not sure about wot make pipe it is but think by look of it should be a topend screamer lol..

[mk1rob]

well its going to get a new top end definitely the bike has obviously bin played about with to much with some 1 who didn't have a clue wonder what i will find next lol

[johnlc]

Think i have seen that porting somewhere before on the other forum didnt think much of it then either .What was the airfilter connected with

[mk1rob]

lol it had no air box on it just a bit of fine mesh over the carb

[mk1rob]

some one has kindly offered me a top end which i will put on

[racerd]

yz piston has 1 piston ring but in the photo the piston has two rings so this a tzr piston kit
i use a tzr piston kit in my ypvs barrel

[racerd]

below
on the right a lc 2.00mm over size piston and on the left a tzr piston


below on the right a tzr piston and on the left a yz125h piston


below on the right a lc piston in the middle a tzr piston and on the left a yz125h piston



all these piston fit straight onto a lc connecting rod (con rod)
also got more photo's if needed

a few more photo's of above

[racerd]

tzr piston






yz125h piston









lc piston












these are just some of my photo's that are on my forum

[racerd]