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korich1

2010 yz 450 acceleration problem

15 posts in this topic

So here is my situation I raced a hare scramble this weekend a hour and half, bike ran great on the 2nd lap only on full acceleration the bike would not run, backfires and sounded dead,it did not stall and would idle and ran on 1/4 throttle, but anymore throttle then that would would not rev up sounded like you hit the kill switch but with a backfire. It stalled once because I didn't get out of the throttle fast enough and I started the bike right back up and ran fine, it was almost like the ecm reset itself, about 15 minutes or so the bike went back to same thing no acceleration, and this happened 1 more time I wrecked and restarted the bike and it ran fine for another 10 minutes or so, when I finished the race it was acting up again so I hooked up my gytr power tuner to see if there was a code and it still showed 0 on the error code, any help would be great thanks

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2. Do you filter your gas before putting it in the tank?

3. Have you serviced the fuel pump filters?

4. Have you service the FI injector nozzles?

5. Do you treat your gas to prevent Ethanol corrosion?

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I just got the bike have checked the filters etc, the weird part is it has no problems for 15 minutes or so then starts acting up. Almost like ecm forgets what it's doing, because once it shuts off And is restarted it will act normal again, was just trying to see if anyone else had a bad sensor, fuel pump, ecm etc thanks

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Could also be something as simple as an obstructive gas cap vent.  Next time it acts up, instead of restarting, crack the cap loose for a second or two and see if that clears things up.

 

As far as the sensors go, it's possible that one is acting up.  Download a manual and run the tests described there.  If you can get your hands on a GYT-R tuning scanner, you can pull problem codes from the ECU also.

 

Manuals:

http://www.yamaha-motor.eu/eu/services/owner-manuals/index.aspx

 

http://www.yamahaownershandbook.com.au/?r=0

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Thanks I will use the link, I do have a gytr power tuner but no codes come up and everything appears ok. Once again thanks

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Really sounding like a fuel pump. I never had an issue with mine, however, two of the guys I ride with have 2010's. All of them have had fuel pumps go bad with identical symptoms to yours.

Edited by proclimber522

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Definitely fuel delivery related by the sound of it. The filter is "non-serviceable", but that depends on how determined you are (note the title of the linked thread):

 

http://www.thumpertalk.com/topic/1017998-2010-yz450-bogs-after-15-minutes/#entry10702600

 

This is great info! The thread ends without saying if cleaning the filter worked though? For how long? I am now going to look into possibly replacing my OEM fuel line with soft hose and putting in an aftermarket filter. I think doing this will prolong the fuel pump life. Hmmmm :thinking:

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This is great info! The thread ends without saying if cleaning the filter worked though? For how long? I am now going to look into possibly replacing my OEM fuel line with soft hose and putting in an aftermarket filter. I think doing this will prolong the fuel pump life. Hmmmm :thinking:

 

A filter in the line past the pump won't help the pump any, but the injector may like it.  If the filter at the pump plugs up and restricts flow to it, the one downstream will make no difference.

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Right. Dunno what I was thinking? I guess in my mind I was picturing the fuel pump being external. Brain fart! :wacko:

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ImageUploadedByThumper Talk1393880699.380566.jpg

Thanks for the info went onto eBay and bought both pump and filter couldn't pass them up for 35 dollars.

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II think greyracer idea about the airflow thru the gas cap sounds like your issue. Same thing happens to me if I have my bike opened up a bit, like rippin down a gravel road, all of a sudden the bike starts acting like it has low fuel and the power sucks. Defiantly check that one, it won't cost you anything

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Yes for sure, I have a 09 also and I will take the lid of the stock tank with breather and try that also, thanks everyone

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Recently having the same low end bog and back fire. Checked valves, good, air cleaner, good, sensor in air box, good. fuel injector cleaned and re-installed, took the tank apart and cleaned filter like everyone else. Found replacement submersible fuel line at Napa. Tygon Tubing, part number 7-08152, 1/4" line. $3 a foot. Runs like brand new again. Thanks for all the help!

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