Rieju & GasGas Legacy Riders Club Forum  

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

Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc.


Reply
 
Thread Tools Display Modes
  #1  
Old 10-23-2014, 03:27 AM
dimtsam dimtsam is offline
Member
 
Join Date: Aug 2014
Posts: 53
Default A lot of fault spark plugs...

Hello everyone
I got a 250 2T 2011 EC. And now my problem is that I have a lot of faulty spark plugs. I found our that when I go downhill, after a while makes the spark plug go off. I thought the problem was the jetting. I put on a smaller jet but nothing happen. Same thing...Then I tried to reduce the gas level in the carb. I adjust the float and reduce it enough. Nothing again...
What else can I do? Maybe a smaller idle jet?


Reply With Quote


  #2  
Old 10-23-2014, 05:24 AM
paulos paulos is offline
Senior Member
 
Join Date: Jan 2014
Location: australia
Posts: 185
Default

Quote:
Originally Posted by dimtsam View Post
Hello everyone
I got a 250 2T 2011 EC. And now my problem is that I have a lot of faulty spark plugs. I found our that when I go downhill, after a while makes the spark plug go off. I thought the problem was the jetting. I put on a smaller jet but nothing happen. Same thing...Then I tried to reduce the gas level in the carb. I adjust the float and reduce it enough. Nothing again...
What else can I do? Maybe a smaller idle jet?
What jetting specs are you running at the moment?
__________________
2011 Gasgas EC200, 1966 BSA 350 scrambles, 1972 Montesa cota 247
Reply With Quote
  #3  
Old 10-23-2014, 10:08 PM
(F5)'s Avatar
(F5) (F5) is offline
Gold Level Site Supporter
 
Join Date: Jul 2006
Location: Wellington New Zealand
Posts: 2,094
Default

[QUOTE=dimtsam;142577]. . . I thought the problem was the jetting. I put on a smaller jet but nothing happen. . .. QUOTE]

What jet? The Mainjet? - that operates when full open throttle position.

Quote:
Originally Posted by dimtsam View Post
. . . . I found our that when I go downhill, after a while makes the spark plug go off.. .
Now we're getting somewhere. Idle jet controls here - and in some cases if the needle is wrong. . . In GG the needles are too thin at closed so you are getting too much wet hard to ignite gas through.

So starting at the start.

Clean filter, replace if grotty. Read up on jetting threads here, get a good needle/idlejet combo. Use decent correct plugs. Replace plug cap if in doubt (I like the blue NGK marine ones).
There is a small chance the coil is a bit crap but do above first. A modified head helps things burn better.
__________________
'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
  #4  
Old 10-23-2014, 10:58 PM
Jakobi's Avatar
Jakobi Jakobi is offline
Super Moderator
 
Join Date: Oct 2010
Location: Australia
Posts: 7,992
Default

Don't forget the float height. If the fuel level is too high you'll also get excess flooding forwards into the engine (particularly down hill).

Its about putting all the pieces of the puzzle together. The needle is a big piece of that puzzle, but the rest all has to work with it.
Reply With Quote
  #5  
Old 10-24-2014, 10:05 AM
Leo's Avatar
Leo Leo is offline
Senior Member
 
Join Date: Sep 2008
Posts: 499
Default

....and are you using Grade 8 plugs? Grade 9 plugs are very prone to it on low speeds.
__________________
www.endurohp.eng.br
Sherco ST300 2015 (Trials)
https://www.instagram.com/leocm74/
Brasil!
Reply With Quote
  #6  
Old 10-24-2014, 01:14 PM
dimtsam dimtsam is offline
Member
 
Join Date: Aug 2014
Posts: 53
Default

I' tried both 8's and 9's.Same shit
Reply With Quote
  #7  
Old 11-14-2014, 09:51 AM
motopsycho87 motopsycho87 is offline
Senior Member
 
Join Date: Jun 2013
Location: Suffolk, UK
Posts: 905
Default

You are most likely running rich in whatever section of the throttle you are using the most causing fouling on the plug. Does it clear up after a good burn through the gears?

Use an iridium plug, I killed plugs every 2 rides, I've had my iridium plug in almost 2 years, it got gammy last week when I rebuild my engine and used 25:1 mineral oil for break in, but runs fine once I thrashed the hell out of it.

BR8EIX is the part number. Please note, KTM 300EXCs use a heat range of '7' to combat this same issue.
__________________
2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear

2016 RM-Z450
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
spark plugs michalt95 Enduro Engine - 2 stroke 13 04-20-2012 10:25 PM
spark plugs kiss161 Enduro Engine - 2 stroke 10 03-04-2012 07:47 PM
What Spark Plugs lordfeyr Enduro Electrical & Wiring 25 05-06-2010 11:49 PM
i keep fouling spark plugs??? tom-s Enduro Engine - 2 stroke 7 08-28-2009 01:37 AM
Fuel tap fault Warwick Simpson Enduro Intake/Carburetion - 2 stroke 0 11-09-2008 12:15 AM




All times are GMT -5. The time now is 07:56 PM.


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