Help Please: Bike bogging when throttled up


6 replies to this topic
  • doubld250

Posted October 21, 2011 - 03:06 PM

#1

I have a nearly new 09 WR450F with 3 rides on it, it has a powerbomb and a power core TI. It has set up for a few months, gas smells fine it starts and idles fine but when I twist the throttle it bogs And will not run, if I leave the choke on it's a little better but still it will not rev up much. Any suggestions?

  • Krannie McKranface

Posted October 21, 2011 - 03:48 PM

#2

I have a nearly new 09 WR450F with 3 rides on it, it has a powerbomb and a power core TI. It has set up for a few months, gas smells fine it starts and idles fine but when I twist the throttle it bogs And will not run, if I leave the choke on it's a little better but still it will not rev up much. Any suggestions?


Sounds like a clogged acclerator pump nozzle or mainjet.
If a slow roll-on throttle is fine, but a quick whack gives you a bog that you never had before, you either have a rotted accelerator pump diaphram, or you have a clogged accelerator pump nozzle.

If any attempt and turning the throttle gives you a bog, you have a fuel delivery problem. Start with the tank vent, then the tank fuel line, then the carb inlet, then the mainjet.

  • GuyGraham

Posted October 22, 2011 - 01:24 AM

#3

I agree
if all else fails, take carb off bike and hang it at the side of the bike
look down the venturi and confirm you get a squirt of fuel
it should be approx 1 sec duration on a full throttle opening, and should not hit the slide

Use a digital camera to film it to confirm
you want the squirt to just miss the slide as it lifts

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  • doubld250

Posted October 22, 2011 - 03:26 AM

#4

Thanks for the advice gents, I'll check those things and hopefully get her up and running soon.

  • Krannie McKranface

Posted October 22, 2011 - 03:18 PM

#5

Thanks for the advice gents, I'll check those things and hopefully get her up and running soon.


You don't need to remove the carb. Just lift the subframe and watch it 'squirt'.

  • GuyGraham

Posted October 23, 2011 - 08:44 AM

#6

You don't need to remove the carb. Just lift the subframe and watch it 'squirt'.


removing it stops it flooding the engine plus you get better film clip from a digital camera due to the venturi being lit by daylight rather than being in darkness due to still being fitted to engine
takes a few goes to get a good film clip

yes, if just to confirm it working then no need to remove

  • YamaLink

Posted October 24, 2011 - 05:13 AM

#7

Fingers crossed it is the simple main jet. While you're in there make sure the pilot isn't clogged.




 
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