engine slows then stops when heated up

N

naphtaliq

New Member
I have a CL360 that was working perfectly until a last week. When i go for a long ride the bike with run well for 20-30 minutes then start coughing a bit then the motor slows down even though I'm giving it more gas. After a while it stops. I've done the mechanical stuff (carbs, petcock, had the clutch checked because it started after I changed the clutch cable) so I'm thinking that It's mechanical. The Clymers says to check the spark plugs and the wires, they seem fine. So that leaves me with a tone of stuff but I suspect that I might need new coils... Is my thinking right? Is there something that I'm missing? Help a brother out. thanks! Here she is BTW
 

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Could be coils. Have you tried checking for spark after it dies?
How long after it dies do you have to wait before it'll start up again?
After it dies, if you open the cap on the fuel tank, does it suck in air?
When was the last time you checked timing and valve clearances?
 
where's the airbox?

what's a long ride? how long of a ride had you gone on before when the problem did not occur?

what has changed since the last time you had it on a long ride with no problems?

it's unlikely it needs new coils, they rarely go bad at the same time. help us with some information and we can help you with diagnosing it before you start tossing parts at it.
 
Sonreir said:
Could be coils. Have you tried checking for spark after it dies?
How long after it dies do you have to wait before it'll start up again?
After it dies, if you open the cap on the fuel tank, does it suck in air?
When was the last time you checked timing and valve clearances?
Click to expand...

I haven't checked directly afterwards... but after I walk it home (which is about the same amount of time that it usually would take to fire up again) it has had spark. I need to start taking my socket set with me!
Doesn't suck in air
I haven't checked them, my mechanic has but that was probably 4 months ago.

rockcitycafe said:
where's the airbox?
what's a long ride? how long of a ride had you gone on before when the problem did not occur?
what has changed since the last time you had it on a long ride with no problems?
it's unlikely it needs new coils, they rarely go bad at the same time. help us with some information and we can help you with diagnosing it before you start tossing parts at it.
Click to expand...

I have K&Ns on it, runs sweet, really don't think that they are the problem
Went on a 2 hour drive this afternoon, stopped in a 7-11 for a drink then when I got back on the bike it had issues.
Changed:
New clutch cable (last one broke during long ride about 2 weeks ago) had my mechanic change it because I couldn't get it adjusted perfectly (was stuck between too much play and the "pop" from the worm gear jumping)
New tires
 
a clutch cable isn't going to keep a bike from starting. what's the longest ride you've been on since the k&n's went on?
 
rockcitycafe said:
a clutch cable isn't going to keep a bike from starting. what's the longest ride you've been on since the k&n's went on?
Click to expand...

I don't remember exactly how long, but I've been on multiple full day trips (DC to frederick or baltimore maryland all on back roads) since I put them on. I cleaned them as part of the diagnostic, but the problem persists, didn't change a thing.
The carbs were where I started investigating. Also had them checked out when I sent in for the tires. Through the problem was fine but it happened again yesterday.
 
It's the K&N filters
You did fit larger secondary main jets?
When you do it will run rich mid-range
Clutch cable could be pulling on coil connector?
 
crazypj said:
It's the K&N filters
You did fit larger secondary main jets?
When you do it will run rich mid-range
Clutch cable could be pulling on coil connector?
Click to expand...

To be honest I got the bike with the K&Ns on there and didn't mess with them, the owner said that he'd rejetted but I don't know which size he chose is there a way to tell the stock screw from a larger one visually?
But if it's that it's running lean why does it run well for a while? And why did the problem "appear"? Trying to understand.
 
A wire probably got pulled loose when cable was changed.
Remove gas tank and check oll the connectors.
It's also posible condensor is failing?
There is a possibility carbs have been modified, did you get bike from anyone here?
 
the problem can appear as carbon builds up on the plug from a rich mixture, it doesn't happen all at once, and running in a different rpm range can burn it off, but extended running in the rich band will make it feel like it's dying, then when you stop the bike it will be almost impossible to restart, carbon is a mild conductor and when it coats the ceramic insulator, it makes a path to ground, resulting in a weaker spark, if any spark at all
 
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