Issue with bike starting

[Billy]

Guys,

I posted this a while ago on cbrworld.net and I wanted to post it here to see if anyone had any insight on it.

Heres my weird issue. I got a 1999 CBR 600 F4 (carborated) that hesitates to start when the engine is very warm. Like if Im riding on the bike and I stop and turn her off and then I go back say like 10 mins later to start it back up, she will hesitate, but she she always eventually kicks over (thank god). It usually takes like about 4-5 seconds for the engine to kick over (yes the choke is off, I'm not that stupid).

But if I haven't used the bike in a long time and the engine is cold, I put the choke on (like you're suppose to) and it kickes over right away. The carbs were re-synced backed in July and I put new spark plugs, new battery, and a new air filter in her back in June. The bike has always acted like this even before I did my tune up back in June.

Any ideas?

[Awesome]

Either the battery or the voltage regulater most likely.

[Billy]

Where is the voltage regulator located?

[Billy]

Nevermind I found out where it is!!.

[RandyO]

I dooubt it's your battery or RR, if your battery was weak it wouldn't start better when cold

I think your starter itself is on its way out, when cold, the starter works fine, expansion from heat is causing it to drag and turn over slower

[richw]

Sounds like a rich condition


The enrichening circuit on the carbs (choke) are like little plungers.

Look at carbs while actuating the choke lever. See that the dribbler plungers are closing all the way on each carb. Push then towards close with a little force and see if they move. Sometimes they get gunked up and will not close leaving the bike flooded.

Speaking of flooded make sure one of the carbs is not overflowing constantly which will also flood the engine.

What is gas mileage if your getting less then 40 bombing around then I would be sure its carbs.

Lastly look at the side of the tank. Read the words it explains it

[Awesome]

My race bike always has trouble turning over when it's hot but cranks right up when it's cold. Honda tech told me it was an issue with the placement of the regulator and it getting very hot.

[rjh200]

Originally posted by hessogood
My race bike always has trouble turning over when it's hot but cranks right up when it's cold. Honda tech told me it was an issue with the placement of the regulator and it getting very hot.

That issue should have only been with the 03 rr's. The 04+ they added a heat shield to keep the regulator from getting to hot. I can't remember any issues like that being common with the F4i's.

[Billy]

Originally posted by RandyO
I dooubt it's your battery or RR, if your battery was weak it wouldn't start better when cold

I think your starter itself is on its way out, when cold, the starter works fine, expansion from heat is causing it to drag and turn over slower

No thats not the case. The speed at which the starter cranks is the same all the time.

[legalspeed]

I raced a '99 F4 for two years, never had that problem.

I'm in for the carbs.

[Billy]

OK seems like a common trend is forming here. A lot of people think the part that is causing the problem is the volt regulator, and the conditon thats causing it, is heat.

Now stop me if I'm wrong but if I were to buy a new volt regulator it's not going to solve my problem unless I do something about keeping the volt regulator cooler?

[legalspeed]

Degsy may have some input and could hook you up with a great mechanic.

He's on here shoot him a PM.

[Billy]

Originally posted by legalspeed
I raced a '99 F4 for two years, never had that problem.

I'm in for the carbs.

I doubt its the carbs because I had them jetted/cleaned/synced this past July.

[stoinkythepig]

If it's cranking over normally and just not starting, it's probably not the voltage regulator or anything electrical. Crack the throttle a smidge when cranking it. It's necessary for may carburetor equuiped engines in a hot start.

[Billy]

Originally posted by stoinkythepig
If it's cranking over normally and just not starting, it's probably not the voltage regulator or anything electrical. Crack the throttle a smidge when cranking it. It's necessary for may carburetor equuiped engines in a hot start.

Hmm never thought of that. I'll have to try that and see if it makes a difference.

[Rice-rocket1]

Originally posted by BadBoyBilly
I doubt its the carbs because I had them jetted/cleaned/synced this past July.

When did this problem start, after the carbs were rejetted or before?

Sounds like the bike is running a bit rich from the re-jet and may need to be checked.

Had the same problem with an FZ750 after rejetting and had to bring it back to get it straightened out.

[Billy]

It's been like that even before I rejetted the bike. Rejetting it made no change.

[KB]

Have you ever changed the air in the tires? You have to change it with the seasons. If you have winter air in the tires during the summer than this will cause it to start hard.

Go to your dealer and ask them to change the air.

KB

[Punjistick]

speaking of air in tires...I heard that some people are starting to put pure nitrogen in instead of air...something about better mileage. I think airplanes already do that if I'm not mistaken.

[stoinkythepig]

Originally posted by Punjistick
speaking of air in tires...I heard that some people are starting to put pure nitrogen in instead of air...something about better mileage. I think airplanes already do that if I'm not mistaken.

Nitrogen will have more stable pressure with changes in temperature than plain old air. Can't imagine the difference could help mileage or affect the typical street bike. I can see why it would be used in a racing application though, especially in a car.

[Punjistick]

I guess it also prevents tires from catching fire due to lack of oxygen in a crash. Like a while ago when that plane had to make the emergency landing.

[Hardcore]

nitrogen is a gas! + we all burn gas in our bikes! therefore,by deductive reasoning, nitrogen must burn also!

[Punjistick]

http://www.bridgestone.com.au/tyres/...e/nitrogen.asp

[Billy]

Actually I just found out what my issue was. Turns out there's nothing wrong with the bike, it was the way I was starting it when the engine was warm.

Last night I ended up reading my Clymers manual and I ended up browsing through the Troubleshooting section. I came across the starting issue section and it said if the engine is warm or the air is 95 degrees and above to not use the choke, open the throttle slightly and press the start button.

My issue was I never opened the throttle slightly. Never knew about that!!!!

[Awesome]

Originally posted by hardcore
nitrogen is a gas! + we all burn gas in our bikes! therefore,by deductive reasoning, nitrogen must burn also!

HAHAHA!!

Neighbor 1: "Hi, there, new neighbor, it sure is a nice day to be moving"
New Neighbor: "Yes, it is and people around here seem extremely friendly"
Neighbor 1: "So what is it you do for a living?"
New Neighbor: "I am a professor at the University, I teach deductive reasoning"
Neighbor 1: "Deductive reasoning, what is that?"
New Neighbor: "Let me give you and example. I see you have a dog house out
back. By that I deduce that you have a dog."
Neighbor 1: "That is right"
New Neighbor: "The fact that you have a dog, leads me to deduce that
you have a family."
Neighbor 1: "Right again"
New Neighbor: "Since you have a family I deduce that you have a wife"
Neighbor 1: "Correct"
New Neighbor: "And since you have a wife, I can deduce that you are
heterosexual"
Neighbor 1: "Yup"
New Neighbor: "That is deductive reasoning"
Neighbor 1: "Cool"

Later that same day

Neighbor 1: "Hey, I was talking to that new guy who moved in next door"
Neighbor 2: "Is he a nice guy?"
Neighbor 1: "Yes, and he has an interesting job"
Neighbor 2: "Oh, yeah what does he do?"
Neighbor 1: "He is a professor of deductive reasoning at the University"
Neighbor 2: "Deductive reasoning, what is that?"
Neighbor 1: "Let me give you an example. Do you have a dog house?"
Neighbor 2: "No"
Neighbor 1: "Fag."