Hard Starting

[cnjdawson]

Here's the Bike; 2002 Busa w/ full Hindle exhaust, PC111R, Dyno tuned map, small airbox mod, BMC Race Filter, Idle set at 1200, 34K miles on her.

Here's the problem; She started just fine until I had my valves adjusted at 30K miles.  Now for the last 4K miles she's getting harder and harder to start.  In the morning (temp 40-50 outside) when the motor is cold (fast idle on or off doesnt make a difference) she cranks and cranks and cranks before she finally starts. I do bursts of about 5 seconds and stop for about 10 seconds before trying again.  Usually it takes 3-4 bursts before she starts.  Now once in a great while she will start up first try.  OK, now when motor is warm she will start on the second burst about 60% of the time and start right up 40%. Hot or cold the Busa seems to run like normal once started.

Here's what I have tried;
New Battery (the 14 like eveybody suggested)
New Plugs
New Air Filter
Removed and cleaned the fuel pump and filter (filter was barely dirty)
Ran 2 cans of that Seafoam fuel treatment through her
I unpluged the PC111r
Fuel pump kicks on like normal

NONE OF THE ABOVE HAVE EFFECTED THE PROBLEM WHATSOEVER!

Am I missing something?  Do I need a new starter (seems to crank like normal)?  I have searched every topic on this and done everything I can think to do except get new injectors! I dont get it, She runs great once started!

I am beginning to think that when the mechanic adjusted the valves he messed something up.

 

[cnjdawson]

Wow! No one wants to touch this one, huh?

 

[03busa40th]

I would'nt complain about it as ong as it still starts

p.s. sounds like fuel delivery problem to be obvious because of the inconsistancey.

 

[djcapita]

Curious to see what it is when you figure it out. Have you checked the TPS? Try that. Mine was doing almost the same thing and I changed the plugs and synced the tps and she starts right up now.

 

[Wag]

Bump. I'd like to know the solution to this as well.

Once in a while, when the bike has been in the hot sun for a while, the bike is hard to start. If I open the filler cap, it will release pressure and then it starts right up.

I have to believe you have a fuel delivery problem. The Sea Foam has some cleaning properties so I have to believe your injectors aren't the problem, but you never know.

Another possibility is that your mechanic connected a fuel line backwards. Verify the routing of everything with the service manual.

--Wag--

I hope you figure it out.

 

[bigoltool]

2 questions. When it runs does it run OK? And when were the Throttle bodies last synched? May look for vacuum leaks as well? Jinkster had a write up on here about a year ago (maybe more?)on adjusting valves and he ran into some issues as I recall after that. Might be worth looking into?

 

[cnjdawson]

Thanks for the ideas! I will check the fuel line today and I will get the TB's and TPS sync'ed as soon as I can.
Bigoltool; She seems to run fine once started, although sometimes when she does start she blubbers like she has no fuel for a second. Its been about 10K miles since TB's were last sync'ed but thats next on my list.

 

[BanditKing]

I'm running into the exact same problem. Is it the throttle position sensor and throttle bodies? How do you synch these?

Thanks.