Fuel Screw


5 replies to this topic
  • mummer12

Posted October 14, 2006 - 02:20 PM

#1

I bought a MSR HP fuel screw last year and lost the directions on adjusting it. I know that there are numbers on it but do I have to go in all the way and then back out 1 full rotation for one turn? numbers mean quarter turns? What is everyone running on 06 YZ 2/14 turns?? Thanks

  • flintlock28

Posted October 14, 2006 - 02:40 PM

#2

Warm the bike up FULLY

Turn the IDLE screw in, to make a faster than normal idle

Begin turning in the fuel screw until the engine begins sputtering (you're leaning it out)

Slowly unscrew the FUEL screw, until you hear maximum RPM. STOP turning it.

Try riding the bike, and experiment turning the fuel screw in or out in 1/4 turn increments until you get the best response.

A handy hint.....When you acheive maximum RPM, you also want to listen for hearing the crispest throttle response. IF it sounds kinda Dull, and flat sounding, than you are still too rich.

oh, I forgot, set the idle back to normal when riding.

  • tnl

Posted October 15, 2006 - 12:47 PM

#3

Assuming the elevation stays the same and the only big change is a drop in air temp. minor humidity change, would a 1/4 turn out in my fuel screw correct the sputtering on decel. or in? Never messed with my fuel screw yet. Just wondering where to start. Also, don't have a small enough screw driver. Is it a flat head or Phillips?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • kyle450rider

Posted October 15, 2006 - 01:58 PM

#4

It's a flat head and it's very small.Motion pro makes a nifty little screw driver that works great.

  • 5hauler

Posted October 19, 2006 - 11:03 AM

#5

on my 03 yz 450 the fuel screw is out 2 n 1/2 turns. stock pilot jet. on my 04 wr 450 its out 3 turns on stock fuel screw. I need to go up at least 1 size on pilot screw on the wr .
Jay

  • KD123

Posted October 19, 2006 - 06:51 PM

#6

Like flintlock28s response above. Just to add, I just received a Zip-Ty fuel screw from JD Jetting. Same concept as your MSR. JD recommends to seat it (screw it in all the way), then back out 1 1/2 turns. Then start it up and fine tune with 1/4 turns in one direction, blipping the throttle at each setting.





Related Content

Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Forums
Photo

First Hare scramble tips by dhend8


Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.