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CB500/550 / Cyclinder 1 not running too temp?
« on: December 07, 2020, 10:23:41 PM »
Hi
Just taken delivery of a recently restored CB550, they work on it looks great. I cant fault the bike in anyway except Cylinder 1 does not seem to be running as hot as the other 3?
Bike starts fine, with it being cold weather today, shortly after starting steam comes out of 3 of the 4 pipes. Headers on 2 to 4 get hot really quickly as you would expect, Number 1 gets warm but you can keep your hand on the header.
With it being recently restored (No history on the resto, however it has been a engine out, frame up job, with new nuts and bolts and engine paint, so not a blast with pressure washer quickie) I dont want to start pulling things off etc.
So fitted new plug.
Getting a healthy spark when you take the cap off the plug when running you can hear it jumping from cap to plug.
however No difference in RPM when you do this.
Bear in mind its been years since I worked on a bike (V8 and V12 fuel injection has been my staple diet for 10 years) so not sure if its a carb fault? they have been ultrasonically cleaned apparantly, air leak?
Engine sounds sweet??
When you build the revs from idle to 3K slowly no hunting or missing?
when revved quickly idle to 3kplus sometimes a pop from the exhaust.
Although not road tested due to weather, seems smooth up and down the garden.
I think I have covered it all
Any ideas ?
Thanks for reading
Just taken delivery of a recently restored CB550, they work on it looks great. I cant fault the bike in anyway except Cylinder 1 does not seem to be running as hot as the other 3?
Bike starts fine, with it being cold weather today, shortly after starting steam comes out of 3 of the 4 pipes. Headers on 2 to 4 get hot really quickly as you would expect, Number 1 gets warm but you can keep your hand on the header.
With it being recently restored (No history on the resto, however it has been a engine out, frame up job, with new nuts and bolts and engine paint, so not a blast with pressure washer quickie) I dont want to start pulling things off etc.
So fitted new plug.
Getting a healthy spark when you take the cap off the plug when running you can hear it jumping from cap to plug.
however No difference in RPM when you do this.
Bear in mind its been years since I worked on a bike (V8 and V12 fuel injection has been my staple diet for 10 years) so not sure if its a carb fault? they have been ultrasonically cleaned apparantly, air leak?
Engine sounds sweet??
When you build the revs from idle to 3K slowly no hunting or missing?
when revved quickly idle to 3kplus sometimes a pop from the exhaust.
Although not road tested due to weather, seems smooth up and down the garden.
I think I have covered it all
Any ideas ?
Thanks for reading
