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.

Thread Tools Display Modes
Old 05-16-2017, 03:33 PM
welsh.Z.S. welsh.Z.S. is offline
Join Date: Oct 2016
Posts: 73
Default Basic idle setting ?

Changed my idle screw today from the crappy plastic one to the nice shiny easy adjustable one , is there a basic setting to go buy with the idle screw now so I can get a rough point to start from ? IE 1.5 turns out etc .. bike has a fresh top end etc so is nice and​ crisp
Reply With Quote
Old 05-20-2017, 01:17 AM
motopsycho87 motopsycho87 is offline
Senior Member
Join Date: Jun 2013
Location: Suffolk, UK
Posts: 905

I'd air screw you should start @ 1.5 turns out. Anything under 0.75 out and 2.5 out requires a different jet.

If it's less than 0.75 out you need a larger idle jet

If it's more than 2.5 out you should first check your needle. Most people find that the original needle allows fuel by at idle, if you've already got a better needle. Then smaller pilot.

Idle adjuster screw is adjusted to whatever gives the slowest but most stable idle. Some run with their idle slightly higher to avoid stupid stalls in slower sections (woods etc)

Make sure all adjustment are made at running temperature. You need to have ridden the bike, idling and revving for a few minutes isn't enough to uniformly heat the engine.
2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear

2016 RM-Z450
Reply With Quote
Old 05-20-2017, 04:03 PM
TheLetterJ's Avatar
TheLetterJ TheLetterJ is offline
Senior Member
Join Date: May 2013
Location: Santa Maria, CA USA
Posts: 185

Whenever I've just rebuilt a carb (any carb) I turn the idle screw until you can just start to see daylight under the slide, and turn the air/fuel screw 1 1/2 turns out from seated, that's usually a good baseline to get the bike started. It is easier to fine tune the idle down from too high of an rpm, than it is to have to keep making adjustments and restarting the bike when trying to turn the idle up.
Reply With Quote
Old 05-20-2017, 07:51 PM
Jakobi's Avatar
Jakobi Jakobi is offline
Super Moderator
Join Date: Oct 2010
Location: Australia
Posts: 7,992

As above. Another method you can use is to listen. Back it right off until you head the slide stopping hard against the carb body. Then continue making small adjustments while letting the slide drop back down. You should hear when it makes contact against the idle screw. That's about the point it starts to lift.
Reply With Quote
Old 05-23-2017, 12:38 PM
mjtursky mjtursky is offline
Join Date: Sep 2013
Location: Fond du Lac, WI
Posts: 27

The reason Keihin went to plastic for the idle speed screw is to avoid breaking the tab on the slide. This occurred when people would let the throttle snap back when revving the engine. I found the screw used on Polaris snowmobile Keihin carbs to work better. Bigger knob and slightly longer. Be sure to get the correct spring with the adjustment screw.
Reply With Quote

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
Basic clutch question archangel.ahl@gmail.com Enduro Engine - 2 stroke 2 05-03-2017 06:46 PM
2004 300 ec idle setting ... Packman Enduro Intake/Carburetion - 2 stroke 4 08-15-2013 05:38 AM
ec 300 setting correct pilot jetting, idle low end hillbilly Enduro Intake/Carburetion - 2 stroke 5 07-08-2012 10:28 AM
Gas Gas EC 300 09 Basic Suspension Settings snaissidis Enduro Suspension 0 03-16-2009 04:05 PM
Basic Settings for 2005 DE250 the eel Enduro Suspension 1 09-02-2006 12:37 PM

All times are GMT -5. The time now is 07:19 PM.

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