Throttle lag


13 replies to this topic
  • cobraman

Posted April 09, 2008 - 09:17 PM

#1

Greetings! I now own a 2007 WR450 and starting to ride again. On my first official day of ride number 1...I already crashed. Nobody told me that even in 3rd gear and a handful of throttle, I would see the sky and you can imagen what happen from there. :thumbsup: OOpps.

Anyhow, a question to all. From an idle position, when you hit the gas hard the enging wants to die..or if it's warmed up there's just to much lag between gas and power.

Any thoughts?

Thanks in advance for your help

  • fishpost19

Posted April 10, 2008 - 12:51 AM

#2

Two words:

"Accelerator Pump"

  • timoyz1

Posted April 10, 2008 - 04:57 AM

#3

New bike or used? If it's new then yes, your AP timing is off or blocked all together. If its used and had any gas left in it, or rode alot and dirt has made it up into your carb and just needs some cleaning. Heavily suggest a jet kit and a Merge APS, and if you have to pull the carb off, grease your suspension, mine was very dry.

  • w00dsRider

Posted April 10, 2008 - 05:04 AM

#4

New bike or used? If it's new then yes, your AP timing is off or blocked all together. If its used and had any gas left in it, or rode alot and dirt has made it up into your carb and just needs some cleaning. Heavily suggest a jet kit and a Merge APS, and if you have to pull the carb off, grease your suspension, mine was very dry.


Can't say it enough... Grease that suspension! Yamaha factory treats grease like it's gold.

  • cobraman

Posted April 10, 2008 - 06:22 AM

#5

It's a brand new bike. Only have about 3 hours on it so far. Thanks to all that have responded so far.

  • timoyz1

Posted April 10, 2008 - 06:42 AM

#6

New bikes can have crap in the carb too. Have you done the mods? Snorkle, throttle stop screw, and exhaust baffle will do wonders alone.

  • face_plant

Posted April 10, 2008 - 12:49 PM

#7

i was told at the last yamaha class that idle to 3k if you snap it it will die
it is normal. same thing for the yfz450

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  • WR450SM

Posted April 10, 2008 - 01:40 PM

#8

i was told at the last yamaha class that idle to 3k if you snap it it will die
it is normal. same thing for the yfz450


That is a load of crap. It may be normal for off the showroom floor bikes to do this, but that doesn't mean the owners should not tune them for the conditions that they actually ride in. The AP can be tuned to give unbelievable response, and not stall when throttle is applied quickly from 3k or even idle.

  • William1

Posted April 10, 2008 - 02:18 PM

#9

Get yourself a #40 leak jet from the YZ parts bin, and also O-Ring the AP linkage

  • hoople

Posted April 10, 2008 - 07:46 PM

#10

does anyone have a pic of the o-ring mod?

  • w00dsRider

Posted April 11, 2008 - 03:43 AM

#11

does anyone have a pic of the o-ring mod?


Here's some pics of it done on a KTM and it doesn't look much different.
http://www.thumperta...ight=o-ring mod

  • timoyz1

Posted April 11, 2008 - 04:34 AM

#12

I spent the $20 and got the Merge APS. I had the carb off and apart and figured money well spent instead of a o-ring that could break and get stuck somewhere at the wrong time and place.

  • William1

Posted April 11, 2008 - 04:54 AM

#13

http://www.thumperta...ad.php?t=624773

  • Rick1141

Posted April 11, 2008 - 05:04 AM

#14

http://www.yamaha-mo...0/1/detail.aspx




 
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