RE: Bike dying at High speeds

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RE: Bike dying at High speeds

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RE: Bike dying at High speeds - 4/29/2008 10:39:07 PM

GoodGravy_54

Posts: 15
Joined: 3/1/2008
Status: offline

hey followmatt, does your fuel pump ever turn on? The bike will run without the fuel pump wired up, i was just curious cause mine never does.

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Post #: 16

RE: Bike dying at High speeds - 4/29/2008 10:41:57 PM

GoodGravy_54

Posts: 15
Joined: 3/1/2008
Status: offline

what would keep the fuel pump from getting power?

< Message edited by GoodGravy_54 -- 4/29/2008 10:51:22 PM >

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Post #: 17

RE: Bike dying at High speeds - 4/30/2008 9:13:35 AM

frankmackie

Posts: 112
Joined: 11/16/2006
Status: offline

i replaced a pump twice thinking it was that... it wasnt.
it may also be that your rectifier went out or isnt working properly. (this happened to me too). when its at low speeds or at idle etc in the garage it would run and run no problems but once reved up a bit it doesnt put out enough power to charge the battery and run the bike. (stock ones are known to get too hot and die). you can use a volt meter on the terminals to check the output at the various rpm's.
(make sure your battery is good too of course)
you should be reading at 13.5+ volts (but not over 15).... if its over/undercharging, replace it with an aftermarket one with fins and make sure the back is grounded well to disperse heat.... i actually installed a small computer fan on mine to keep it cool.

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Post #: 18

RE: Bike dying at High speeds - 4/30/2008 9:20:00 AM

followmatt

Posts: 13
Joined: 4/24/2008
Status: offline

My fuel pump turns on when i turn the key. I think thats what it is anyways. It makes like two clicks then i dont hear anything else? Is that what it sounds like?

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Post #: 19

RE: Bike dying at High speeds - 4/30/2008 3:51:01 PM

GoodGravy_54

Posts: 15
Joined: 3/1/2008
Status: offline

yeah, just a couple clicks initially then ist is supposed to turn on when you are above 20km/hr. Have you checked to see if the speed sensor wire is unattached, i dont know exactly where it is, but it should be somewhere by the gage cluster, its P/Y according to the manual.

Hey frankmackie, will the bike not rev if the rectifier is bad. I can still drive mine around town and it will rev like normal??

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Post #: 20

RE: Bike dying at High speeds - 5/5/2008 9:45:54 PM

GoodGravy_54

Posts: 15
Joined: 3/1/2008
Status: offline

I got the relay put in today and still no power to the fuel pump? Any ideas?

thanks in advance

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Post #: 21

RE: Bike dying at High speeds - 5/6/2008 1:37:24 PM

GoodGravy_54

Posts: 15
Joined: 3/1/2008
Status: offline

Alright I think I have figured my problem out, but now I am really confused. If my kill switch is in the off position when I turn on my key there is no prime of the fuel pump (bad). If the kill switch is in the on position when I turn on the key the fuel pump primes and I can ride above 45 mph. That seems very odd, has anyone else ran into this?

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Post #: 22

RE: Bike dying at High speeds - 5/8/2008 6:15:47 AM

followmatt

Posts: 13
Joined: 4/24/2008
Status: offline

good_gravy i just sold my bike. Im done ****ing with it man its been nothing but a problem since i have had it. I am getting a 1995 cbr 900 rr. Good luck with your bike man.

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Post #: 23

RE: Bike dying at High speeds - 5/9/2008 8:12:18 AM

dufferman10

Posts: 33
Joined: 3/30/2007
Status: offline

Well, I've seen a lot of people with the issues of having their bike die at higher speeds and no one seems to have the answer to this. I called American Honda at 866-784-1870 and talked to Alex. Maybe if everyone starts calling them to tell them about the crappy problem, Honda might do something about it. Alex also told me that if you took your bike to the Honda Dealership that the mechanic has an 800 number that they can call and talk directly to the person who designed the F4 at Honda. He would not give me the 800 number, but everyone should start calling American Honda and then maybe someone will be able to get that dang number for the guy who designed the F4 and get some real answers!!

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Post #: 24

RE: Bike dying at High speeds - 5/23/2008 5:18:26 PM

Gabtoks

Posts: 2
Joined: 6/24/2007
Status: offline

I seem to have a similar problem. I was going to work, low speed in small streets for 20 minutes. Got on the highway, gunned it, it caughed a little once I got of throttle, and 2 minutes after, stalled at highway speed.

Happened a few times, sometimes high speed, sometimes low speed. I cleaned the carbs, changed spark plugs, just need to synchronize the carbs ( waiting for the tool to show up ).

Could it be possible the carbs not being synchronized cause the problem? I can hear a ... bubbling sound comming from the exhaust. The bike surges while at constant speed.

Any advice is appreciated :)

Gabe

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Post #: 25

RE: Bike dying at High speeds - 6/11/2008 4:05:02 PM

Gabtoks

Posts: 2
Joined: 6/24/2007
Status: offline

Anybody found a fix to their problem?

At this point I am considering buying a new fuel pump and both relays, just so I can remove those part from the diagnostic process.

Gabe

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Post #: 26

RE: Bike dying at High speeds - 6/15/2008 11:56:35 AM

nickb02

Posts: 3
Joined: 6/15/2008
Status: offline

I bought a ''99 F4 about a month ago and had this problem a week later. I changed the fuel filter and the problem dissapeared, but I think it''s actually related to heat...
The problem returned on Friday after work. It died on me 4 times on my 8 mile drive home. I brought it to the shop on Saturday morning but they were unable to recreate the probem so they were really just looking blindly for the problem. The mechanic ended up changing the fuel line between my tank and filter saying that it was unnessecarily long and as a result was bent on a fairly small radius.
So my theory is, based on the feel of the fuel lines, that when they get warm, they get easier to bend. So on hot days if that tube is already bent tightly, it''s possible that it could bend tighter or even kink, restricting flow to the engine. Same goes the vent line, causing a low pressure in the tank making it harder for the pump to draw fuel. Or for you guys saying your pump doesn''t run sometimes, there''s no way your fuel is going to flow just from gravity if you''ve got a low pressure in your tank.
Anyway, my suggestion is shorten or replace your stock fuel lines before trying anything pricey. Keep in mind it''s only been a day since I''ve "fixed" the problem so I may not even be close. But I did drive from San Diego to LA on saturday afternoon and no problem sitting in traffic or doing freeway speeds (and maybe a little faster...)
Good luck, and I''ll keep you posted if the problem comes back.

Also, for you guys saying your fuel pump isn''t running below certain speeds: I have a clear fuel line and can see that mine turns on just reving it in neutral.

(in reply to Gabtoks)

Post #: 27