Idle Issues


8 replies to this topic
  • Yamaster

Posted September 23, 2006 - 03:29 PM

#1

I have a yfz450 cam in my 05 with the cam mod done. The bike runs extremely strong and has a hard pull all the way to rev limiter. My problem is that when I coast down a hill with the clutch in, it will die. It also wont idle without the choke on. I just adjusted the vavles, hoping it would help, but no luck. Then I tried to change the jetting, but ended up only one needle position from where I was. What do you guys think it could be?

  • Indy_WR450

Posted September 23, 2006 - 06:36 PM

#2

Try changing to a richer pilot jet like a 48 or 50 and opening up your fuel screw at least to 2 turns out.

  • Yamaster

Posted September 25, 2006 - 03:52 PM

#3

I have a 50 and my fuel screw is around 2.5 turns out.

  • Indy_WR450

Posted September 25, 2006 - 03:58 PM

#4

Well my buddies with the YZ450 end up going leaner with the pilot. Some of them run a 40 or 42 pilots to get the YZ450 to idle right. But we have an ACV circuit on our carbs so we need to richen it up 2 jets to be at the same flow as theirs on a leaner pilot. I am confused why your bike runs with the choke but wont idle. It is worth a shot but leaner may be worth trying. Is your ACV cirucit bypassed? :thumbsup:

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  • RichBaker

Posted September 25, 2006 - 07:43 PM

#5

Sounds like a clogged pilot jet...how long has it sat between rides??

  • Dodjy

Posted September 26, 2006 - 02:03 PM

#6

Check the fuel screw is assembled correctly. I had a similar problem when I lost the little o-ring off it. It was sucking air, leaning out the idle mixture so going bigger on the pilot made no difference.

  • Yamaster

Posted September 29, 2006 - 09:05 PM

#7

My acv is not bypassed and my fuel screw should be fine. It doesnt have an vacuum leak. I ride my bike at least once week (used to be 1-2 times a day until I got a job). It didnt start doing this until I did the cam. I also dont believe it is the pilot because it will fire up after a kick or two, hot or cold (e-start takes a little bit). Power is immediate and pulls all the way to the limiter. I just took it to the marysville mx park on sunday and it did pretty good. Could it just be something with the timing?

  • Yamaster

Posted September 29, 2006 - 09:08 PM

#8

Is there anyone who makes a stronger threading for the hot start cable that goes to the carb? I dont believe my leaks, but the threads are garbage.

  • Alley Cat

Posted September 29, 2006 - 09:29 PM

#9

Is there anyone who makes a stronger threading for the hot start cable that goes to the carb? I dont believe my leaks, but the threads are garbage.

procircuit.




 
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