GasGas Riders Club Forum  

Go Back   GasGas 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
  #11  
Old 07-11-2019, 11:09 PM
V8Astro V8Astro is offline
Member
 
Join Date: Jul 2019
Posts: 16
Default

Got my head back from my machinist friend. He took .020? (sorry I?m showing my American now posting measurements in thousandths of an inch) and I achieved .048? squish. Which I translated into 1.25mm
Attached Images
File Type: jpg 3C6A81CF-ECDB-4777-A65F-AB69C325B0A7.jpg (129.6 KB, 17 views)
File Type: jpg A9AFEB2B-BE4E-4B3A-93CA-1BB5345688C1.jpg (112.6 KB, 17 views)
File Type: jpg 9E123CCE-4EF6-4B2C-9213-78CE284D9FA4.jpg (110.0 KB, 21 views)


Reply With Quote


  #12  
Old 07-12-2019, 07:23 AM
Zman's Avatar
Zman Zman is offline
Platinum Level Site Supporter
 
Join Date: Apr 2010
Location: Burbs of Chicago
Posts: 1,484
Default

Looks great! 0.48 is good but you need to also check your compression. What octane fuel are you running?
Reply With Quote
  #13  
Old 07-12-2019, 10:39 AM
V8Astro V8Astro is offline
Member
 
Join Date: Jul 2019
Posts: 16
Default

Quote:
Originally Posted by Zman View Post
Looks great! 0.48 is good but you need to also check your compression. What octane fuel are you running?
That?s my next step. I bought a burette on amazon. I?m running US gas 93 octane (r+m)/2
Reply With Quote
  #14  
Old 07-12-2019, 01:06 PM
Jacob 'Berg Jacob 'Berg is offline
Senior Member
 
Join Date: Mar 2014
Location: Scottsdale, AZ
Posts: 502
Default

I thought this may be useful:

http://49ccscoot.proboards.com/threa...ression-ratios
Reply With Quote
  #15  
Old 07-12-2019, 07:20 PM
(F5)'s Avatar
(F5) (F5) is offline
Gold Level Site Supporter
 
Join Date: Jul 2006
Location: Wellington New Zealand
Posts: 1,407
Default

And there's this
Gets a bit off topic but comes right in the end.

Actually it's not a bad thread if I say so myself. Lots of points I'd forgotten on the first page.

http://www.gasgasrider.org/forum/sho...highlight=Head
__________________
'07 EC300
496 CPI Cheetah RZ/RGV hybrid
675 Street Triple R
RS125 framed MB100 racer
Stinger T125 Suzuki
Reply With Quote
  #16  
Old 07-12-2019, 08:46 PM
V8Astro V8Astro is offline
Member
 
Join Date: Jul 2019
Posts: 16
Default

Very helpful links. Thanks everyone!
Reply With Quote
  #17  
Old 07-13-2019, 04:50 PM
V8Astro V8Astro is offline
Member
 
Join Date: Jul 2019
Posts: 16
Default

I cc?d the chamber today. I did it about 6 times to make sure my results were repeatable. Once I got bad reading because of an air bubble in my burette.

I settled on 23.4cc. Running the calculations I got 13.5:1 Comp. Should I leave the chamber alone or should I take some material off? I?d like the Comp high as 93 octane will allow.
Attached Images
File Type: jpg 1ED1C69F-D59A-4C07-BFAC-C72F65589B5F.jpg (51.8 KB, 5 views)
File Type: jpg 5A4D21EA-8918-49DE-96E2-C49F985C2187.jpg (134.6 KB, 8 views)
Reply With Quote
  #18  
Old 07-13-2019, 04:54 PM
(F5)'s Avatar
(F5) (F5) is offline
Gold Level Site Supporter
 
Join Date: Jul 2006
Location: Wellington New Zealand
Posts: 1,407
Default

MON or RON? I forget which is higher. Google it for your country.
__________________
'07 EC300
496 CPI Cheetah RZ/RGV hybrid
675 Street Triple R
RS125 framed MB100 racer
Stinger T125 Suzuki
Reply With Quote
  #19  
Old 07-13-2019, 05:20 PM
V8Astro V8Astro is offline
Member
 
Join Date: Jul 2019
Posts: 16
Default

Average of the two (R+M)/2. I think our 93 is like euro 98 RON
Reply With Quote
  #20  
Old 07-13-2019, 10:16 PM
(F5)'s Avatar
(F5) (F5) is offline
Gold Level Site Supporter
 
Join Date: Jul 2006
Location: Wellington New Zealand
Posts: 1,407
Default

I wouldn't go any higher that should just be ok if your petrol is consistently ok.
So that is 2 threads up the spark plug threads? If it's to the top you will have to adjust.

I had to take quite a bit out of the chamber to get compression ok.
__________________
'07 EC300
496 CPI Cheetah RZ/RGV hybrid
675 Street Triple R
RS125 framed MB100 racer
Stinger T125 Suzuki
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
Post in the right forum gasgasman General Discussions & Announcements 3 09-07-2015 07:27 PM
My first post. Adss General Discussions & Announcements 1 05-29-2013 04:52 PM
First Post papa_j Pictures & Videos 12 03-08-2012 08:28 AM
First Post JdB Enduro Suspension 20 05-26-2008 10:33 AM




All times are GMT -5. The time now is 10:20 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 2009 - GasGasRider.org