tri-z question...piston???

[rxraptor02]

guys, this is for the tri-z

I got my top end stuff back today and was reading the instructions. in the instructions it says to drill two holes on the piston for lubercation. I have rebuilt 2 different motors. one was a lt250 and a yz125 and never did this trailprotrailpro.

Do I need to drill these lubercation holes?

If I do does anyone have any tips.

thanks
-Jim

[FireHead]

Thats wierd. I don't know the answer, but I anxious to hear it.

[rxraptor02]

yeah,

over on 3wheeler.org some guys do this...but none with tri-z's

I think on the instructions it sates that some modle require this.....darn generic instructions.

I am gonna have to call wesico to find an answer.

[FireHead]

I have a few books I'll look in. It maybe some old school racers secret. As far as modern two stroke go. I wouldn't go drilling holes places. If there were supposed to be holes there, Wiesco would mill holes there.

[rxraptor02]

yeah, a buddy said that doing that is like brain surgery and one slip and goodbye...lol

any help your be great on this...

I am gonna start putting things back together on saturday i hope my from motor mounts arrive by then.

later
-Jim

[nutsandbolts95]

you only drill the 2 holes if there is a exhaust bridge. if you look into the exhaust on the jug your ehaust will be divided by a thin peice of metal. in order to drill correctly you must asemble the top end. then bring piston to top dead center. then with a pencil run down both sides of the bridge. disassemble your top end and with the drill bit it says to use drill 2 holes inbetween the 2 lines following the mesurements that the instructions states. these holes are for lubrication. if you do not do this it could cause you fresh top end to melt down.
joe

[pops]

Hi JIM I raced a tri Z for 5 years on some rebuilds i drilled the holes others i did not it did not seem to make any difference to the small end bearing which it was to help lube good luck with rebuild cheers ian

[rxraptor02]

thanks everyone for your input on this question.

I went home and found the old piston an it did not have these holes drilled in it. so I will not drill them.