question on 2 stroke piston ring locating pin

[Mario]

Hi all, I am finishing a 2 stroke build (my first one) and got the cylinder back from Edco with a Wiseco piston. I am about to install the rings and found out there is only one locating pin in the top and just a hole in the bottom ring, no pin. Both rings look identical. Is this supposed to be this way or should I contact Wiseco for a replacement?
Thanks!

 

[buellistic]

It's on there web site.. call them.
http://blog.wiseco.com/2-stroke-locating-pin

 

[bobl]

I would contact Wiseco. The ring pins stop the ring from rotation. If they rotate, the ends can get caught in ports causing major damage.

 

[Mario]

I read their website before posting, I didn't find anything related to the second groove. I thought there might be a reason why it is not installed... I'll give them a call tomorrow.

 

[buellistic]

I read their website before posting, I didn't find anything related to the second groove. I thought there might be a reason why it is not installed... I'll give them a call tomorrow.

There open Sundays?.:laughing

 

[Mario]

Monday! I'm so tired of wrenching I don't even know what day it is! I need to go ride... :ride

 

[kuksul08]

Both rings should have locating pins

 

[Maddevill]

This
On 2 strokes the rings must be retained in place. If there is no pin , the ring is going to rotate, catch the port and probably destroy the bore. I'm starting to question Weisco's quality control. This is not the first time I've seen this.

Mad

 

[OaklandF4i]

Need two pins. Yours fell out for what ever reason. Call Wiseco and they will surely send you a replacement.

I use Wiseco in my YZ250, but if you are uncomfortable with using them going forward and still want a forged piston, Wossner is available.

 

[Mario]

Called Wiseco, very quick to dismiss me and send me back to the engine shop, "you got to deal with the engine shop, good luck". Thank you!

Luckily Engine Dynamics (guy is amazing) was very helpful, asked me to ship the piston back and will ask to ship a new one straight to my place. Will ask for his advice on this. I hope it didn't "fall out" of the groove because if that is a possibility during manufacturing/shipping, it is a possibility it will happen in the engine and that would be catastrophic.

 

[peterhively]

I had one come out of an OEM KTM 300 piston in operation...made a big effin mess as you can imagine.