Rieju & GasGas Legacy Riders Club Forum  

Go Back   Rieju & GasGas Legacy Riders Club Forum > GasGas Enduro Technical Forums > Enduro Engine - 2 stroke

Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


Reply
 
Thread Tools Display Modes
  #1  
Old 03-04-2023, 12:20 PM
SS109's Avatar
SS109 SS109 is online now
Senior Member
 
Join Date: Jan 2011
Location: Tucson, AZ
Posts: 987
Default Piston pin length

Currently in the middle of rebuilding/refreshing my '11 EC250. Well, first time looking in the box of my new S3 piston and it doesn't have a new pin with it. Ugh. Anyway, I have a CR250 piston pin that is the same in all dimensions except length as it is about an 1/8" shorter.

Question, could I use this pin without issue or would it moving from side to side cause wear or balance issues? I would prefer not to use the old pin, and don't want to wait on ordering one in, so was hoping this might work.

Never mind. I mic'ed up my old pin and it was still within spec so I used it.


__________________
WildAzzRacing YouTube channel
Trail Riders of Southern AZ club
AZ State Parks OHV Ambassador
'11 EC250R
'98 KDX220

Last edited by SS109; 03-04-2023 at 04:57 PM. Reason: additional info
Reply With Quote


  #2  
Old 03-05-2023, 07:58 AM
Zman's Avatar
Zman Zman is offline
Platinum Level Site Supporter
 
Join Date: Apr 2010
Location: Burbs of Chicago
Posts: 1,818
Default

If I recall correctly, an engineer at Wiseco said it is not ideal to have the pin shorter than the piston bore between clips. I think it was related to the pin moving laterally and potentially hammering on the clips. I am not sure where the force to move the pin laterally comes from so I dont really understand it. If it is not too late maybe a 1/16 thick aluminum washer (of the same diameter of the pin), or other suitable spacer on each side of the pin to take up the gap.
Reply With Quote
  #3  
Old 03-05-2023, 04:30 PM
SS109's Avatar
SS109 SS109 is online now
Senior Member
 
Join Date: Jan 2011
Location: Tucson, AZ
Posts: 987
Default

Quote:
Originally Posted by Zman View Post
If I recall correctly, an engineer at Wiseco said it is not ideal to have the pin shorter than the piston bore between clips. I think it was related to the pin moving laterally and potentially hammering on the clips. I am not sure where the force to move the pin laterally comes from so I dont really understand it. If it is not too late maybe a 1/16 thick aluminum washer (of the same diameter of the pin), or other suitable spacer on each side of the pin to take up the gap.
Thank you. I appreciate the info!
__________________
WildAzzRacing YouTube channel
Trail Riders of Southern AZ club
AZ State Parks OHV Ambassador
'11 EC250R
'98 KDX220
Reply With Quote
  #4  
Old 03-05-2023, 05:57 PM
(F5)'s Avatar
(F5) (F5) is offline
Gold Level Site Supporter
 
Join Date: Jul 2006
Location: Wellington New Zealand
Posts: 2,062
Default

Probably the best move. I'd be very cautious about introducing any washer in the assembly.

There is a hell of a force on something being shaken up and down so fast. I've destroyed stuff trying to hybrid stuff on race engines to my shame.
__________________
'07 EC300 GG
'14 TXT250 GG
'? 496 CPI Cheetah RZ/RGV hybrid
'22 765 Street Triple RS
'21 XTrainer
'69 Stinger T125 Suzuki
'23 TRS 250RR (it's a Trials thing)
Reply With Quote
  #5  
Old 03-08-2023, 05:17 PM
Zman's Avatar
Zman Zman is offline
Platinum Level Site Supporter
 
Join Date: Apr 2010
Location: Burbs of Chicago
Posts: 1,818
Default

Good point about the washers. Scratch that idea.
Reply With Quote
Reply



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
? re: Spring Length farmerj Enduro Suspension 1 01-02-2021 12:38 AM
2010/450 chain length emuexport Enduro Chassis & Body 0 04-17-2016 02:25 AM
Dogbone length for 2005 EC 250 bally123 Enduro Suspension 2 10-24-2015 04:34 AM
chain length IDAHOSPUD Enduro Chassis & Body 5 01-23-2012 04:21 PM
Spring length question Bandit9 Enduro Suspension 4 06-26-2007 05:22 PM




All times are GMT -5. The time now is 07:14 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright 2009 - GasGasRider.org