won't start when the engine is warm.. why?

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won't start when the engine is warm.. why?

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won't start when the engine is warm.. why? - 7/4/2006 4:05:30 PM

Shakta

Posts: 13
Joined: 7/2/2006
Status: offline

Hello brothers

i got my CBR last thursday and have been driving like crazy

so i actually don't know the bike very well, so i was hoping anyone of you guys(girls) did

But there is a thing that is really annoying.. it starts perfect when cold or less warm. But if i have been driving and go to the tank station to get som gas, then it won't start again.. really confusing. It will start really easy if i run it to start.

Another thing is i can hear the difference on the starter engine when it won't start and it starts.. it's like it runs faster the times it actually starts and slower when it won't start. I would think it was a battery problem.. can anyone confirm this teori?

i stille have some warranty from the dealer.. but if it's only a battery i can fix it myself

or else i have to give it back for a week or so to let him fix it.. and i can't do that.. the weather is to good

hope anyone can help

< Message edited by Shakta -- 7/4/2006 4:06:37 PM >

Post #: 1

RE: won't start when the engine is warm.. why? - 7/4/2006 5:27:54 PM

MarkR

Posts: 975
Joined: 8/20/2005
From: Gold Coast, Australia
Status: offline

Don't think it's the battery,
I have heard of this before, something about fuel vaporising from the carbie's when hot

(in reply to Shakta)

Post #: 2

RE: won't start when the engine is warm.. why? - 7/5/2006 12:09:47 AM

Shakta

Posts: 13
Joined: 7/2/2006
Status: offline

ok

but what can there be done about that?

yesterday i got it startet and accidently hit the engine stop button 2 secs after... and after that it wouldn't start again.. could it vaporise so fast?

< Message edited by Shakta -- 7/5/2006 12:15:04 AM >

(in reply to MarkR)

Post #: 3

RE: won't start when the engine is warm.. why? - 7/5/2006 4:27:35 AM

MarkR

Posts: 975
Joined: 8/20/2005
From: Gold Coast, Australia
Status: offline

No cause the bike is cold, that sound to me like your flooding it, my bike start with no throttle when hot.
When cold, I just need a little bit of throttle , or no throttle and some choke.

I find my bike a little nackie to start on throttle, but easy with choke.

(in reply to Shakta)

Post #: 4

RE: won't start when the engine is warm.. why? - 7/5/2006 9:57:56 AM

DRam

Posts: 405
Joined: 7/21/2005
Status: offline

You say the engine doesn't turn over as fast when hot as when cold? I've heard of that before, but for the life of me can't remember what causes it. It isn't fuel related, though. Nor is it related to the battery. Something to do with carbon build up? Or was it . . . dang!! I just don't remember. It is the result of increased resistance to turning over when hot, but the reason escapes me. Sounds like you need to talk to a mechanic.

(in reply to MarkR)

Post #: 5

RE: won't start when the engine is warm.. why? - 7/5/2006 10:35:46 AM

Shakta

Posts: 13
Joined: 7/2/2006
Status: offline

MarkR
I don't give it any throttle at all.. not when cold or hot.. but i have been trying to, to see if it would help

DRam
yep.. it's slower whit hot engine

well... i guess i have to talk to a mechanic

(in reply to DRam)

Post #: 6

RE: won't start when the engine is warm.. why? - 7/5/2006 5:06:01 PM

MarkR

Posts: 975
Joined: 8/20/2005
From: Gold Coast, Australia
Status: offline

Change the Plugs and clean/Replace the Air Filter and see what happens.
I read somewhere that the carbie/choke can slightly effect the speed of the starter, I can't remember what they said, it was on this site somewhere.

(in reply to Shakta)

Post #: 7

RE: won't start when the engine is warm.. why? - 7/6/2006 12:21:03 AM

Shakta

Posts: 13
Joined: 7/2/2006
Status: offline

ok... thx for all answers

i'll try my luck and hope for the best

(in reply to MarkR)

Post #: 8

RE: won't start when the engine is warm.. why? - 7/6/2006 11:01:23 AM

DRam

Posts: 405
Joined: 7/21/2005
Status: offline

Me again. Still curious about your starter motor turning over more slowly when hot than when cold. To satisfy that curiousity I talked to a mechanic who said, "Check the starter." His claim is that sometimes the armature will drag on the fields when hot. This leads to excessive current draw for the starter, leaving less to fire spark plugs. The result is a non-starting engine. When the engine and starter cool down the starter will again spin freely, so there is enough current available to fire the plugs. Sounds reasonable to me, and the mechanic is one I trust and respect.

DRam

(in reply to Shakta)

Post #: 9

RE: won't start when the engine is warm.. why? - 7/6/2006 11:16:05 AM

Shakta

Posts: 13
Joined: 7/2/2006
Status: offline

Hmm.. would it might help with a dry battery.. since, i've heard that they offer more power?

but thx again

(in reply to DRam)

Post #: 10

RE: won't start when the engine is warm.. why? - 7/7/2006 7:59:52 AM

MarkR

Posts: 975
Joined: 8/20/2005
From: Gold Coast, Australia
Status: offline

"yesterday i got it startet and accidently hit the engine stop button 2 secs after... and after that it wouldn't start again.. could it vaporise so fast? "

This means something, no heat after 2 seconds

(in reply to Shakta)

Post #: 11

RE: won't start when the engine is warm.. why? - 7/7/2006 9:13:46 AM

Shakta

Posts: 13
Joined: 7/2/2006
Status: offline

I have been driving and it was only cooled off a bit... enough to get it startet i guess..

(in reply to MarkR)

Post #: 12

RE: won't start when the engine is warm.. why? - 7/31/2006 1:58:28 PM

Shakta

Posts: 13
Joined: 7/2/2006
Status: offline

Now the starter is changed, but that wasn't the problem (still don't know what the problem is) So they will get it in when i'm on vacation for 10 days in august. So they can find the problem. They have been jetting the carbs and giving me a new battery and a new starter but it still didn't help

(in reply to Shakta)

Post #: 13

RE: won't start when the engine is warm.. why? - 7/31/2006 2:15:59 PM

TimBucTwo

Posts: 615
Joined: 6/13/2006
From: Upstate NY, USA
Status: offline

My take one the starting problem is that, I have heard that when the piston to cylinder tolerance is tight, or ring to ring groove, the pistons can expand making the engine hard to start when it its hot. I don't actually know what happens. Things aren’t rubbing. I would guess that the ring grooves tighten on the rings and the engine is to tight to turn over. Letting it cool for a few minutes helps with this problem. I had small block Chevy’s that did it to me. They were known for their not wanting to start and turning over slowly when they had just been running.

EDIT ADD: Maybe you should check the engine temp. when it is running. It may be to hot. Perhape changing the thermostat may help. Over heated engines just don't start easy. Flushing the radiator???

< Message edited by TimBucTwo -- 7/31/2006 2:38:48 PM >

(in reply to Shakta)

Post #: 14

RE: won't start when the engine is warm.. why? - 7/31/2006 10:17:23 PM

roadripper

Posts: 2
Joined: 5/10/2006
From: U.S KY
Status: offline

It sounds like it could be a bad coil! A lot of times when a coil is going bad when it's cold it will put out the right amount of voltage, but when it gets hot the voltage drops and it will not produce the right amount of spark. Your machine should have two coils, but if one is bad it's enough to cause it not to start when hot. Sometimes the bike will just quit when it gets hot. My suggestion, take it up the road and get it good and warm, lift the tank, and check to see if your getting any spark.. Check each plug individually(might be getting spark on two of the plugs but not the other two). Another thing, if that's not the problem maybe check the fuel tank vent( it should not build pressure when you take the cap off). If it's building pressure it will override the float seats and flood the engine. Best of luck P.S. If it keeps cranking when your trying to restart it, it is not the battery. Keep Ripping!! Roadripper!

(in reply to TimBucTwo)

Post #: 15