AntwanRTTG

I am about to sell this damn thing if I can't get it figured out.
I just completely rebuilt an F4i and I can't figure out what's wrong with it. The bike runs great, I can ride down the street with quick throttle response and without hesitation. However, when I go to clutch it up from a dead stop when I go to get back into the throttle, the bike boggs out and falls on its face. I have tried almost everything that I can think of. Anyone ever had this?

sik954rr

does it bogg.. or completely cut out?

AntwanRTTG

It boggs like it wants to do something, but it just falls down and it intermittently dies out when it comes down.

deanknight636

what have you checked?

AntwanRTTG

-ohmed the injectors
-new plugs
-thought it might be a gas cap issue because I have a vortex, so I tried a stock cap
-full of gas, half full of gas .... doesn't matter, same outcome
-checked all vacuum lines and routing
-I did the idle screw mod at first, figured that was what caused it so I put it back to stock
-tip over sensor has been removed and bypassed
-airbox has been modded to remove the PAIR valve
-I am going to try synching the TB's tonight and see what that does

deanknight636

put the bike on the 12 bar and try ohming the injectors and see if your still getting power to the plugs also check your fuel pump

AntwanRTTG

Don't have a 12 bar.
If the fuel pump was bad, wouldn't I see other issues when riding it normally? I will check it nevertheless.

deanknight636

yeah you would unless for some reason its gotta a bad connection and is shorting out or something. guess you really dont need to put it up to check that.....i dunno....stock ecu or power commander?

deanknight636

maybe its dumping to much fuel in when you bring it up????

AntwanRTTG

Stock ECU.

GORBO

do you have guages? if so any FI codes?

GORBO

throttle position sensor maybe

AntwanRTTG

Not throwing any FI codes. I am going to look into the TPS as well tonight.

GORBO

maybe a loose ground on the battery,

or maybe the battery is about to **** the bed, my f4i got real boggy and weak right before my last battery died

AntwanRTTG

Brand new battery. I'll check the connections tonight as well.

GORBO

damn that sucks, i was thinking it might just be a old battery and a easy fix, im interested to hear what the problem was

AntwanRTTG

I'll definitely post up if/when I find out.

GORBO

while your in there I would also check out the connection on the engine ground and the other terminal right there with it under that rubber cover right there under the front seat by the fuses

and maybe check the ground from the wiring harness on the left side of the subframe under the gas tank front seat area

BenStunts pa pa

fuel pressure regulator near the side of the throttle bodies...check it?

replace it

deanknight636

exactlyi was thinking that and i put fuel pump lol but you should check that anyways