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Old 30-10-2007
Keg's Avatar
Keg Keg is offline
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My bike is getting fluffy - jetting for everyone over summer

As the weather gets warmer you will find leaning off your jetting will keep engine response crisper! The hotter air becomes thinner meaning you need less fuel to make it work efficiently.

With four strokes, look at winding the fuel screw in 1/4 of a turn if the bike seems fluffy (as I hear people call it) or it bogs when trying to crack the throttle while riding. This will lean your bike up around idle.

Also raising the clip position 1 groove on your needle will help response from 1/4 to 7/8 throttle.

For two strokes, wind the air screw out 1/4 of a turn to improve throttle response off the bottom. This is strongly recommended 3/4 the way through a dusty hot ride!

Again raising the clip position will also help overall throttle response if it is running rich or not coming into "band" like it did over winter.
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Last edited by Keg; 11-11-2009 at 08:00 AM.
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Old 30-10-2007
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threadersmal threadersmal is offline
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Hey Wilko you have this problem ??
Sherco 450 Race Replica


R.I.P Booma

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Club Mud#83

1975 XR75 First bike
1988 Husky AE430
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Old 30-10-2007
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disco disco is offline
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And then we'll post up saying we have overheating problems and you'll say to try going richer!
All I ever wanted was a spamburger.
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Old 30-10-2007
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coley13 coley13 is offline
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just to add to that if you live in a dry climate with no humidity. your mixture will be leaner so take extra care leaning out your needle and main. but buy all means lean out your slow jet for desired throttle response.
13 isnt unlucky, i just keep falling off.
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Old 30-10-2007
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NoFuss NoFuss is offline
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Thanks for the info will give it a go
not that anyone should care what i think
the strangest life i've ever know
"Somethings are just so, it's not logical, it's not defendable in a non-emotive debate, it just is and so should it be." BC
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Old 30-10-2007
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nawill nawill is offline
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I usually swap between 160 and 162 mainjets for summer/winiter. aswell as adjust needle pos'n.
Keeps it singing on the pipe nicely
whether you think you can, or think you cant....
either way, you are probably right.
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Old 30-10-2007
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Peachxr Peachxr is offline
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Nothing worse than a fluffy bike!
XR400 03"
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Old 30-10-2007
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Greedy Guido Greedy Guido is offline
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I can't find that fuel screw thingy Keg, where is it again.
They say that hard work never hurt anyone but I say why take the risk!

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Old 30-10-2007
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Ryno Ryno is offline
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Originally Posted by Greedy Guido View Post
I can't find that fuel screw thingy Keg, where is it again.
It says in the GAS GAS manual that your meant to run them half full of oil in the summer to keep them cool
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Old 31-10-2007
big bore big bore is offline
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What about putting ice cubes in your airbox, to cool the intake air
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Be safe'
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