Bike not idling when cold

[Vetteman761]

Yea got my motor in guys and the bike will not idle when cold, have to give it throttle till it warms up, before i swapped motors it did not do this, does anyone think that it could be the coolant temp sensor? Or anything else could cause this?

 

[Mr Brown]

Gen 1?

 

[RedBull]

Gen 1 ?

New Busa Owner 2004 le | New Owners Forum

 

[Kiwi Rider]

Same throttle bodies? Or different set?
Check for fault codes in the ECM, then try turning up the idle at the idle adjustment cable knob, just above the clutch cover.

 

[Vetteman761]

Gen 1?

Yes its gen 1

 

[Vetteman761]

Same throttle bodies? Or different set?
Check for fault codes in the ECM, then try turning up the idle at the idle adjustment cable knob, just above the clutch cover.

Same throttle bodies, checked and no codes, and turned up idle but when it warmed up the idle was at like 3k rpms

 

[Mr Brown]

Same throttle bodies, checked and no codes, and turned up idle but when it warmed up the idle was at like 3k rpms

That's where I was going with it too.
Do you have a fuel pressure gauge?

 

[Vetteman761]

That's where I was going with it too.
Do you have a fuel pressure gauge?

I do not, that wouldnt be a bad place to start huh, i had over winter did the filter mod and put a external one on it , so should be good flow but never checked pressure

 

[VIPER]

gne 1 has a fast idle for when cold if i remember right? is thta adjusted.

 

[RedBull]

Gen 1
has a
fast idle
for when
cold if I
remember
right ? ? ?

Is that
adjusted ?

 

[Vetteman761]

Just checked pressure constant 43ish, and fast idle is off shrug, it didnt need fast idle with other motor and it was cold then outside

 

[Hayabusa Wannabe]

If you have a laser thermometer, hit each of the exhausts and see if any of the cylinders have a large variance.

Have you balanced the vacuum/synchronized the throttle bodies? Every motor is going to have different flow in each cylinder.

 

[Vetteman761]

If you have a laser thermometer, hit each of the exhausts and see if any of the cylinders have a large variance.

Have you balanced the vacuum/synchronized the throttle bodies? Every motor is going to have different flow in each cylinder.

.
Late reply from me but no I have not done that yet, need to get on fleabay or amazon and get synchronizer