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Discussion Starter #1
Im hoping someone else has had a similar issue and point me in the right direction.
Bike - 03 600rr.
Problem - when the bike gets up to about 220 *F, it has throttle issues. If I shut the bike off while it's that hot, I need to give it about 50% throttle while I crank it for it to fire again.
Also when it's this hot I have to slip the clutch and give it more throttle than normal when moving from a stop.

It's clear that heat is a factor.
Is it "vapor lock"?
Could it be something not related to fuel?
 

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Discussion Starter #3
It has 25k miles.

I bought it with 22k miles on it, and this has been a problem since I got it.

Mods are in my sig.
 

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Discussion Starter #6
I actually changed the plugs at the start of the season last year.

It doesn't throw any codes.
 

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Discussion Starter #8
I have not. Can you point me to it's location on the bike?

Also, maybe I'll try taking the pcIII out and see if it makes a difference.
 

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its on the left hand side just in front of the stator cover. Silver box about 4" square by 3/4" deep...

To check it measure the DC voltage across the battery at 5k rpm with the high beams on, it should be below 15.5V and around 14V ish. Then measure the AC voltage, you don't want to see much here.
 

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Discussion Starter #10
Cool ty. When I get some time this weekend I'll check it out and report back.
 

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Discussion Starter #11
Ok here's what I got.
I did the Pair removal mod. And I took my PCIII off while I was in there, just for troubleshooting.

I rode it around and got it up to 220*F and shut it off.
Cranking was surprisingly better. I tried it several times and it always fired on the 2 or 3rd crank.
A few times it did seem to struggle to turn over at the start of cranking.

I forgot to have my high beams and check AC voltage but here the readings I have.
12.8V @ idle
13.5V @ 5k

9.0V @ 220*F Crank
I can take a cold crank reading after it cools down.

Thoughts?
 

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Sounds normal to me.....

Have a look at the battery connections and ecu plugs for corrosion. It would also be worth looking at the starter solenoid for corrosion as well...
 

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Discussion Starter #13
Sounds normal to me.....

Have a look at the battery connections and ecu plugs for corrosion. It would also be worth looking at the starter solenoid for corrosion as well...

ok new info.

Went to a festival in the city today and was in stop and go traffic for like an hour.
Bike got up to 230-235*F. I started shutting it off when traffic was stopped and it was having trouble firing back up. Each time I shut it off and went to start it again it was worse.
By the 3rd time I went to start it hot it wouldn't continually crank. So I had to bump start it.

So I just got home and I tried the tests again w/ the high beam on.

I let it heat up up to 220 and shut it off and cranked it, if it fired I let it run hot for a bit, then shut it off and keep doing this till it wouldn't crank, just like in traffic.

I had a voltmeter on the battery the whole time to monitor.
At idle the volts were at 12.6.
During a crank where it fired it was at about 10V.

When I got to the point where it wouldn't crank, voltage was dropping to 8V during the crank. And after each crank the at rest voltage of the battery would drop each time. 12.6 then to 12.2 then to 12.0 then to 11.8 and it wouldn't crank.

Before the battery was getting to be dead these were the readings with the high beam on.
12.4V idle
12.8-12.9V at 5k
and 24.5mV AC at 5k.

So I'm leaning to Battery or r/r. Or both.
 

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Discussion Starter #15
How long did you leave it between cranks?

when it was running and i was trying to get it to the point where it wouldn't crank, maybe 5 min.

When it wasn't firing and kept trying to crank it watching the voltage go down, maybe 30 sec.
 

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Was that 5 mins of riding the bike, or just sitting there?

I ask because if you crank and then leave it sit there and then shut down and crank again you will drain the battery on a bike that is working perfectly let alone one that is playing silly buggers.
 

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Discussion Starter #17
Ah i see. Yea it was just sitting idle at that point.

When I got home from riding early, i check the voltage at the battery right when i pulled in the driveway. It was 12.6V. That is a little low for just getting done riding for an hour isn't it?
 

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Ah i see. Yea it was just sitting idle at that point.

When I got home from riding early, i check the voltage at the battery right when i pulled in the driveway. It was 12.6V. That is a little low for just getting done riding for an hour isn't it?
Maybe a little low, but its still not bad at that point.

Take your battery out and have it load tested, I don't think it will be your r/r but you may have an issue with your starter.

Also check the starter solenoid for corrosion on the contacts...
 

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Discussion Starter #19 (Edited)
No corrosion on the starter leads. Has some minor corrosion on the starter relay, but i checked the resistance of the starter relay connections and that was fine.

Working on getting the battery load tested. But it's looking like the battery is the issue.
 

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Discussion Starter #20
Took the battery to autozone today.
Load tested with no problems. So the search continues....

If the charging system is good it HAS to be the starter...
 
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