stuessenhigh Posted April 26, 2005 Report Share Posted April 26, 2005 Yep...mine knocked quite a bit here too...and, again using super unleaded HELPED..but the knocking is still there a LITTLE bit. Maybe I'll try rejetting too? Quote Link to comment Share on other sites More sharing options...
thomas Posted April 26, 2005 Author Report Share Posted April 26, 2005 What finally sorted it was going up one size on the pilot jet. Simple as that. Did you try to set the needle one/two click higher, before re-jetting? Quote Link to comment Share on other sites More sharing options...
jtt Posted April 26, 2005 Report Share Posted April 26, 2005 The needle only works at larger throttle openings. That "close throttle knock" is a pilot thing, or possibly fuel, but I'll bet 1-2 richer on the pilot will cure it A very wise man once told me that you should be able to go WFO in say third gear, close the throttle (without touching the clutch) and let the bike coast all the way down to idle speed...now whack it WFO again. If it responds quickly and sharply (usually a big wheelie) then your pretty close on the pilot setting....if it "clacks" when the throttle is shut, or bogs or hesitates when re-opened, then you can improve it. Quote Link to comment Share on other sites More sharing options...
jenkinsm Posted April 26, 2005 Report Share Posted April 26, 2005 but I'll bet 1-2 richer on the pilot will cure it definitely agree with JTT, mixture screw should always be the first thing to check. Yeh i use first for alot of sections. My m8s laugh at me when i tell them to use first on some big stuff. Always worked for me though. Hope you've sorted your bike out a bit. Just in case you didn't know you turn the mixture screw out to make it richer. Quote Link to comment Share on other sites More sharing options...
neonsurge Posted April 26, 2005 Report Share Posted April 26, 2005 but I'll bet 1-2 richer on the pilot will cure it definitely agree with JTT, mixture screw should always be the first thing to check. The mixture screw and pilot jet are not the same thing Quote Link to comment Share on other sites More sharing options...
jtt Posted April 26, 2005 Report Share Posted April 26, 2005 Just for clarification...the mixture screw and the pilot jet are two different items, althoug do work closely together. Thomas, I don't think the mixture (or otherwise known as the fuel screw) will give you enough variance, think your likely down to replacing a pilot jet. Quote Link to comment Share on other sites More sharing options...
jtt Posted April 26, 2005 Report Share Posted April 26, 2005 Great minds Neonsurge oh, and by the way r2...I said a "wise man" Quote Link to comment Share on other sites More sharing options...
thomas Posted April 27, 2005 Author Report Share Posted April 27, 2005 Just for clarification...the mixture screw and the pilot jet are two different items, althoug do work closely together. Thomas, I don't think the mixture (or otherwise known as the fuel screw) will give you enough variance, think your likely down to replacing a pilot jet. When you say pilot jet, is it the main nozzle or is it the idle nozzle? If the problem happens because of to lean mixture at closed throttle, then I would expect the idle nozzle to be the way to go (if the GasGas has an idle nozzle). Quote Link to comment Share on other sites More sharing options...
thomas Posted April 27, 2005 Author Report Share Posted April 27, 2005 I found the answers: MAIN JET Function: The main jet controls the amount of fuel that's used during half to full Quote Link to comment Share on other sites More sharing options...
jenkinsm Posted April 27, 2005 Report Share Posted April 27, 2005 sorry neonsurge, read it in a hurry. i know they are two different things. Quote Link to comment Share on other sites More sharing options...
jtt Posted April 27, 2005 Report Share Posted April 27, 2005 You got it now Remember on your Dellorto that the screw is actually a "fuel screw" rather than an "air screw" as noted in the TW article...basically the same principal, but now clockwise is leaner rather than richer. Quote Link to comment Share on other sites More sharing options...
thomas Posted April 29, 2005 Author Report Share Posted April 29, 2005 Also check you can blow down the fuel pipe ok and clean the little filter on the carb as they often have alot of residue in after a few weeks use. Usually flakes of aluminum out of tank. The filter at the carburator, is it placed inside the carburator or at the open/reserve/closed valve? Quote Link to comment Share on other sites More sharing options...
charliechitlins Posted April 29, 2005 Report Share Posted April 29, 2005 You got it now Remember on your Dellorto that the screw is actually a "fuel screw" rather than an "air screw" as noted in the TW article...basically the same principal, but now clockwise is leaner rather than richer. A good thing to know: If a mixture screw is on the intake side of the slide, it's an air screw and opening it will add air. If the screw is on the other side of the slide, it's a fuel screw and opening it will add fuel. Quote Link to comment Share on other sites More sharing options...
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