[Dbruce]

Hello! I have a 2007 Honda 420. Ran fine last week now to starts just fine but will not throttle up. After running slow about 50 yards it just dies out. Checked the fuel filter. Was not dirty. Fuel flows freely out of petcock on reserve and run. Any feed back would be greatly appreciated! Thanks !

 

[Goober]

Do you ride it much?When was last PM done?
Try Emptying the fuel tank; change oil; check/change spark plug with OEM. Get fresh no-ethanol premium and mix in some seafoam brand fuel system cleaner. You may have to ride it for 20-30 minutes to degunk the fuel system.

 

[Dbruce]

Thank you ! I ride once or twice a week. Have tried all that you have listed. Even inspected the fuel pump and filter. The F1 light flashed when is cold and even when it’s warm it will flash if too much throttle is given and then bike dies or runs badly.

 

[mrbb]

if you have too much sea foam in tank it will cause running issue's

same if the fuel is bad, when you drained the fuel tank, did you by chance save it?
if so, pour it into a clear container and see if any water is in it>
maybe you bought bad fuel some place?
also, how many miles/hours on motor?
any motor work ever done to it, or mods?

 

[Dbruce]

No mods done at all. Someone told me maybe the O 2 sensor ? Like I said rode it last Monday and it ran fine. Saturday started running bad and the F1 light and coolant light come on when it’s cold or if you give it too much throttle. Changed plug made no difference. New gas and checked fuel filter. Checked petcock gas flows nicely.

 

[arowan]

Hello! I have a 2007 Honda 420. Ran fine last week now to starts just fine but will not throttle up. After running slow about 50 yards it just dies out. Checked the fuel filter. Was not dirty. Fuel flows freely out of petcock on reserve and run. Any feed back would be greatly appreciated! Thanks !

try to adjust the carburetor

 

[Dbruce]

It’s has fuel injectors

 

[shadetree]

try to adjust the carburetor

HAHA..it doesn't have a carb bro ?..ITS FUEL INJECTED !! ( throttle body )….I see your posting a lot, but your not posting correct info ?, but hats off to ya for trying !.

 

[shadetree]

It’s has fuel injectors

well..it has 1 fuel injector, but your correct !! .

 

[SamUK]

Have you checked compression and timing? If the timing is out it may run fine for several yards as the choke (fuel enrichment) will be pumping excess fuel in until the CDI (ECU) tells the injector not to.

I assume you've checked fault diagnosis in the factory service manual?

 

[Dbruce]

Would just like to say thanks to every that helped me out with great comments and direction!! And to let everyone know the fuel pump was not putting out the right psi. 30 psi is the magic number just Incase you want to know. And even if it’s 3 to 4 psi lower it can cause the problem i was having. changing the fuel filter to the vertical style Helps in most cases and keeps the filter off the bottom. But not always. Thanks again everyone! Greatly appreciated

 

[shadetree]

Would just like to say thanks to every that helped me out with great comments and direction!! And to let everyone know the fuel pump was not putting out the right psi. 30 psi is the magic number just Incase you want to know. And even if it’s 3 to 4 psi lower it can cause the problem i was having. changing the fuel filter to the vertical style Helps in most cases and keeps the filter off the bottom. But not always. Thanks again everyone! Greatly appreciated

guessing you got it fixed ?...if so ?, good deal !.

 

[Dbruce]

Yes got it running this evening! Nothing gets fixed if you don’t try. Have to keep on getting it!

 

[shadetree]

Yes got it running this evening! Nothing gets fixed if you don’t try. Have to keep on getting it!

yep, been doing this for 28 years, it kinda grows on ya !..lol.

 

[Goober]

Yes got it running this evening! Nothing gets fixed if you don’t try. Have to keep on getting it!

Hey an ATV of the Month candidate?!

 

[arowan]

HAHA..it doesn't have a carb bro ?..ITS FUEL INJECTED !! ( throttle body )….I see your posting a lot, but your not posting correct info ?, but hats off to ya for trying !.

why do you have a problem with me and all i am trying to do is help but you want to have the biggest attitude.

 

[Dbruce]

Not really sure what your referring to or even if your referring to my comments? But I don’t have any attitude with anyone here. I thanked everyone for the help and posted what I found out to help others with this kind of problem.

 

[arowan]

not you its to shadetree

 

[shadetree]

not you its to shadetree

as I told you in pm, if you post something wrong ? ( like you have done in this thread ) , then I will call you out on it. he clearly has a fuel injection atv, and you told him to check his carb ^^^. twice I have seen you tell a member this, please read up on members machines before commenting , this way, you will not only give that poster some help ?, but the correct help !, thats all I was trying to do towards you, dont take it personal .

 

[Goober]

why do you have a problem with me and all i am trying to do is help but you want to have the biggest attitude.

Hey @arowan we see you’re trying to help—don’t give up. The more seasoned members here have checked me before—Shadetree with me with FI systems, too lol plus CDI applications.

Consider when people describe their probs, seek out the service manuals. Most times the new folks don’t know where they are or what to look for and you can look forward a lil for them—read through the diagnostics and see if you See something they don’t.