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 04-20-2018, 07:14 AM
Davehuge's Avatar
Davehuge Davehuge is offline
Senior Member
 
Join Date: May 2017
Location: English but now based in South of France.
Posts: 470
Default EC300 Which piston size?

Hi all

I have a 2004 EC300, I bought it and have run it for a while. I now want to replace the piston kit, just so I know where I am with it.

I know nothing about the history of the bike or what parts have been replaced.

1. The cylinder is marked 'A' so should I simply fit an 'A' size piston?

2. Are the pistons also marked with a size/letter?

I'm afraid I don't have easy access to accurate bore gauges to measure the actual size of the cylinder.

I'm not looking for absolute maximum performance, reliability is more important to me.

Thanks, Dave.


Reply With Quote


  #2  
Old 04-20-2018, 11:53 AM
Davehuge's Avatar
Davehuge Davehuge is offline
Senior Member
 
Join Date: May 2017
Location: English but now based in South of France.
Posts: 470
Default Update...

Just an update...

I removed the cylinder head today.

The plating looks to be in good condition, can't see the honing marks but also can't feel any lip at the top of the barrel where the rings/piston reach their highest point.

If I put my finger on top of the piston, I could rock the piston backwards and forwards quite a lot, seems excessive to me, so I assume the piston must be pretty worn.
Reply With Quote
  #3  
Old 04-20-2018, 01:37 PM
john r b's Avatar
john r b john r b is offline
Platinum Level Site Supporter
 
Join Date: Aug 2012
Location: Warrenton,Va
Posts: 956
Default

Photo's?
while the cylinder is off, take it to a shop near you. If you do not have proper tools to measure.
__________________
'12 XC 200 TTX Sold
'15 XC 250E Sale pending
Reply With Quote
  #4  
Old 04-30-2018, 02:59 PM
Davehuge's Avatar
Davehuge Davehuge is offline
Senior Member
 
Join Date: May 2017
Location: English but now based in South of France.
Posts: 470
Default

I didn't realise my piston size is marked on the crown, I could only see it after cleaning off the light coating of carbon.

It's a B size and I've decided to fit another B size 71.94mm.

All the best, Dave.
Reply With Quote
  #5  
Old 07-25-2018, 03:23 PM
Desert Silver Desert Silver is offline
Member
 
Join Date: Mar 2014
Posts: 28
Default

IMHO if you don't see any hone marks it's wore out and needs to be re plated. At least that's been my experience.
Reply With Quote
  #6  
Old 07-25-2018, 03:29 PM
Moto7man Moto7man is offline
Member
 
Join Date: Aug 2011
Location: Murfreesboro,Tennessee
Posts: 2,537
Default

Jeff Slavens says to check for a ridge at the top of the cylinder to estimate cylinder wear.

https://www.youtube.com/watch?v=vaFp8aYkHNA
__________________
2011 GG EC 300E, 1994 CR 250R, 1984 RM 250 E, 2022 Ranger 300

"If you stop eating donuts you will live 3 years longer. It's just 3 more years that you want a donut."
―Comedian Lewis Black

"I think best when I have a wrench in my hands." Soichiro Honda

"Dreams are messages from the deep."
-Unknown Sardaukar
Reply With Quote
  #7  
Old 07-26-2018, 03:32 AM
(F5)'s Avatar
(F5) (F5) is offline
Gold Level Site Supporter
 
Join Date: Jul 2006
Location: Wellington New Zealand
Posts: 2,062
Default

Strictly speaking you'd find someone with a proper diamond hone used to doing plated stuff to hone it and measure.

But it's an 04. Scotchbrite (plastic pot pad) it and fit a B and go enjoy it.
__________________
'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
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
Piston Size EC300 stian Enduro Engine - 2 stroke 26 11-28-2014 06:46 AM
Piston size, A/B/C. How important? jdosher Enduro Engine - 2 stroke 5 01-28-2013 08:16 AM
What size of piston? Todd5774 Enduro Engine - 2 stroke 3 10-24-2011 03:20 PM
no piston size stamped on cylinder? stainlesscycle Enduro Engine - 2 stroke 0 08-10-2011 06:44 AM
Cylinder measurement results below so which size piston? stay_upright Enduro Engine - 2 stroke 1 07-28-2009 12:43 AM




All times are GMT -5. The time now is 05:49 PM.


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