off idle bog

29 replies to this topic
  • yamahasocal450

Posted June 08, 2003 - 05:45 PM


yea iwent out and played with the accelerator pump screw and when the bike was on the stand in neutral and i gassed it for the first 2 times it would rev cleanly then it would stall... then i took it out for a ride and i lugged it in 3rd gear then i whacked open the throttle then it would pick up then bog then pick up then bog then pick up go a little faster then rip a huge wheelie... that sounds like a pilot air jet to me... but since that is stock im looking at the main air jet but i dont know where that is or if it even exists on this bike

  • live_to_ride

Posted June 08, 2003 - 05:48 PM


How could it be the pilot air jet if you're rolling along at full throttle while experiencing the problem?

  • yamahasocal450

Posted June 08, 2003 - 05:51 PM


i actually meant 1/8- 1/2 throttle sorry :)

  • live_to_ride

Posted June 08, 2003 - 05:57 PM


My bike is almost fine in that range. When I snap to half throttle it only misses one or two beats, then picks up. Cruising at any position is fine. Snapping the throttle from 1/3 to full is fine. Any less than 1/3 and it falls on its face and sometimes takes me with it. :)

  • yamahasocal450

Posted June 08, 2003 - 06:01 PM


yea i dont know what to do.. when i get all my stuff im going to put in all of the yz jets and start from there because after im through with the airbox it should be as breathable as a yz's...who knows :)

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

Posted June 08, 2003 - 06:05 PM


Do you really think that there is a restriction there? I mean the opening in the top is way bigger than the carb opening.

  • yamahasocal450

Posted June 08, 2003 - 06:12 PM


yea but think about it.. is it easier to suck in air through a tube with an equal diameter or suck in air through a cone with a bigger diameter at the end .. that is why k&n type filters work so well in most applications

  • Jonesy920

Posted June 09, 2003 - 04:59 AM


I put the yz needle in and my bike ran like crap, but taffy reeled me in with a smaller main/pilot setting. I would try a 150-155 with a 38-40 pilot. Start at 11/2 turns. Clip on 4 to start :)

Did It take out the hesitation from idle to Half. ie; stabbing the throttle and it bogs/dies ? I had the YZ needle in and it was definitly too rich. But now with the weather warming up I am getting the same bog with the stock needle, I am going to try moving the needle clip position. My main is good from 1/2 to full and pilot seems good from 1/4 to 1/2. It is just getting too much fuel when I stab it in too low a gear or Trying to roost my Buddy in the mudd :D I'm 500-800 ASL

  • Motocrash

Posted June 13, 2003 - 06:37 PM


See my reply for "WR450 mods only". After all the mods, I can use the fuel screw to adjust out the bog as temp varies. :)

  • Taffy

Posted June 14, 2003 - 12:11 PM


barking! absolutely barking!

woof! woof!

:) :D :D :D :D



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.