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Discussion Starter · #1 ·
I've tried everything: the carbs are clean, it has spark, fuel, compression, the timing is set... and my bike runs like she's ready to die.
She sounds loud enough (though she occasionally backfires) but she has as much power as one of those bicycles with the tiny engines...

Does anybody have an idea of what else I might try?
 

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I've tried everything: the carbs are clean, it has spark, fuel, compression, the timing is set... and my bike runs like she's ready to die.
She sounds loud enough (though she occasionally backfires) but she has as much power as one of those bicycles with the tiny engines...

Does anybody have an idea of what else I might try?

It was running fine one day and this problem just happened?
When you say the carbs are clean, you mean you _completely_ stripped them and cleaned them?
Any rust in the tank?
Does it have new ignition points and spark plugs?
Have you tried spraying starter fluid into the intake when it's running?
Also try spraying it around the intake manifolds and listen for any change in exhaust note indicating air leaks.
Is the battery fully charged?
 

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Discussion Starter · #3 ·
No, she never ran great. I had to give up my previous CB360 a few years ago and since she was the perfect bike for me, I bought the same year and make again. The "new" bike had not run for a while, but I got her running, never great though.
Then she stood another 2 years, until I could bring her to where I live now.
And since spring I've been trying to persuade her to get into road shape.

- the carbs were completely stripped and cleaned
- no rust in the tank, new petcock filter
- new ignition points and spark plugs
- battery fully charged
- starter fluid into the intake does not make a change
-have not tried spraying it around the intake manifolds

She runs well enough when standing there, but she's barely able to roll under load.
Like she's running so rich that there is no power in it. But I do not know what causes the lack of power.
 

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No, she never ran great. I had to give up my previous CB360 a few years ago and since she was the perfect bike for me, I bought the same year and make again. The "new" bike had not run for a while, but I got her running, never great though.
Then she stood another 2 years, until I could bring her to where I live now.
And since spring I've been trying to persuade her to get into road shape.

- the carbs were completely stripped and cleaned
- no rust in the tank, new petcock filter
- new ignition points and spark plugs
- battery fully charged
- starter fluid into the intake does not make a change
-have not tried spraying it around the intake manifolds

She runs well enough when standing there, but she's barely able to roll under load.
Like she's running so rich that there is no power in it. But I do not know what causes the lack of power.

Sounds like you've sorted most of the usual culprits.
The carbs were done just now though, not two years back?
Starter fluid will dramatically alter the air/fuel ratio. A rich condition will go so rich the revs will drop until it stalls or burns off the starter fluid. A lean condition will richen up causing the revs to rise until it burns off the starter fluid. I've never seen it have no effect at all though. Are you sure the intake or air filter aren't blocked?
Have you done a compression test and checked valve clearances?

I just had a look at the fiche and it looks like it has two seperate airboxes?
Did you spray starter fluid into both of them?
Are both headers getting hot?
 

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Discussion Starter · #5 ·
wow, you're good!

- carbs were cleaned 3 weeks ago
- intake and (both:) air filter aren't blocked
- spraying starter fluids in air filters did not really change the way she runs
- taking air filters off makes her run slightly rough, barely noticable
- compression is ok
- both sides get hot (you're right there too, at first she favored one side)

I have not checked valve clearances - how do I do that, and why?
 
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