Bone stock 2009 yfz450r need fuel controller? *Please help* - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
 
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post #1 of 10 (permalink) Old 10-20-2019, 10:16 PM Thread Starter
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Bone stock 2009 yfz450r need fuel controller? *Please help*

I've had the same issue with my quad since i bought it 6 months ago from the original owner and still cannot figure out why it might still do this..low rpm hesitation/bog/loss of power feel then would pick back up rapidly. Idles perfect, revs fine..just dont get it. Replaced almost everything fuel related, tested tps for dead spots and much more..have not pulled the head or tore it apart as i dont think its the issue besides checking the valves. I have invested ALOT of time and money into it and just wondering if buying a PC5 or MSD will solve it even though its bone stock at the moment?

Original owner said it worked fine before storing it for months/hardly ridden also, not sure what was true.
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post #2 of 10 (permalink) Old 10-20-2019, 10:46 PM
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What? Yes!! All efi bog. Save your money and get a vortex. Out the box itll solve it.

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post #3 of 10 (permalink) Old 10-20-2019, 10:56 PM Thread Starter
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Yeah but it doesnt make sense to me that yamaha would sell a quad that runs like crap and make you buy a $400 controller minimium to hopefully fix it..this is my first yfz and learning lots about efi..seems like just a money pit! I understand if i put a pipe and such on it but bone stock running like crap?? Something aint right if they are selling quads that just dont run right..and i know they run them lean for emissions.
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post #4 of 10 (permalink) Old 10-20-2019, 10:57 PM Thread Starter
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And spend $700 on a vortex..sheesh..
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post #5 of 10 (permalink) Old 10-20-2019, 11:38 PM
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The vortex on a stock machine makes a difference

Ď16 Yfz450r
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post #6 of 10 (permalink) Old 10-21-2019, 01:30 AM Thread Starter
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Pc5 or msd also fix this issue? Im assuming its a fuel issue?
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post #7 of 10 (permalink) Old 10-21-2019, 01:30 AM Thread Starter
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Btw thanks for everyones input, greatly appreciate it!
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post #8 of 10 (permalink) Old 10-22-2019, 03:45 PM
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No matter what you use its about getting it tuned with what you have. Just about any tuner will do. Some are better, some are harder, some are expensive...but all of them set up correctly can do the job.


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post #9 of 10 (permalink) Old 10-24-2019, 08:50 PM Thread Starter
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Thanks man, i know just dont see why i should need a controller when its bone stock..
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post #10 of 10 (permalink) Old 10-24-2019, 09:38 PM
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If you really really want, I don't advise it. I actually advise agonist it, but you can crank the tps way up to trick the bike into thinking theres more throttle applied then actually is. Itll send more fuel obviously.

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