Bike ran good before i replaced the regulator, it had poor response down low ( not nearly as bad as it is now ) and bad gas mileage.

Repalced the FPR and now it wont rev above 7500 w/o some serious coercing and i have to rev above 3k to not risk stalling while starting.

Can anyone give me some stuff to try? I dont know what it could be unless i fouled a plug / the injectors got messed up or something.

Any help would be greatly appreciated.. i just want to get up in the mountains and home w/o worrying!

 

Ok checked to make sure my battery connections were tight and they are good

More symptoms:

erratic idle
no auto choke on cold start up

 

To be sure, put the old one back and see if goes back to "normal". That eliminates something new, that you didn't notice, entering the equation.

Not sure what a FPR is though...fuel pump relay? Sounds like the bike is starving, though. So, I'm guessing somewhere in the fuel delivery.

It might be a bad part, even if it's new (it happens, sometimes).

You don't say what kind of bike this is, either. That always helps, too. Is the bike carborated or fuel-injected?

Ern

 

fpr is fuel pressure regulator, if i swap the old one back on i have to poor gas all over the place again ( this time will a full tank >.< ) Will try if i have too

I thought about a bad oem, the fuel pressure hose is dry but still may be bad i suppose.

Bike is an 02 cbr600 f4i ( we in f4i section hehe )

 

Check for a pinched fuel line

 

Propped the tank again and checked the fuel line to the fuel rail and the return from the fpr, they looked fine and i dont think either are kinking when the tank is down.

Ty for suggestions guys!

 

The fpr is a "dumb" part. It could be a bad part but chances are something is pinched, not connected right or blocked

 

Hrm, i dont suppose their is a picture or you have a link to a manual showing how everything is supposed to be hooked up do ya?

It wouldnt cause any harm to the bike to run it with the tank propped up would it? That would let me know if the hoses are pinching when the tank is down at least.

When the bike is running correctly i should be able to whack the throttle and the bike will have no hesitation right? Thats how ive been testing stuff between actual test rides.

 

You can run the bike with the tank propped, no worries.

I don't have the link handy for a pdf of the f4i manual but if you search the f4i section only for "manual" I'm sure a link will appear

 

Got the manual, its too late to go outside and rev the bike ( <3 you bootleg! ) but will continue troubleshooting after work tomorrow.