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129 Posts
Greetings everyone,
With the weather getting a bit colder and the holidays here, it's resulted in me having to get up very early in the morning for work and taking the car instead of the bike. The issue with my 1980 CM400A is that after is sits for a bit, like a week, it'll have a hard time starting. I'm 99% it's from the carbs. It it sits for multiple weeks it becomes very hard to start. If the bike is ran on a regular, daily basis it starts up each morning just fine. For the hard starting I simply just keep cranking it over, applying choke doesn't help it, until it starts to cough and finally fire up.
The carbs were rebuilt, fully cleaned, and professionally synced early this spring. It would occasionally have the hard starting back then but I was riding it almost ever day and as long as it was ran daily, the hard starting rarely came up. The rebuild kit I used was not OEM as I was not able to find a true, full OEM kit. I kept the original jets and floats, the float needles were switched out. New air cuts offs, new accel. pump, almost new everything except for the O-rings that seal the tubes that allow fuel into the right carb as the kits O-rings were not the right size. I have new carb boots connecting the carb to the head, and the fuel line is new and very tightly installed. It seems like the carb as made the issue more pronounced.
I don't want to kill my battery or worse cause unnecessary wear to the started motor. I did run some fuel system cleaner through it a couple month ago which made the throttle response a touch better but did not help the starting issue. Any advise would be appreciated.. Heck probably a tiny speck of dirt got into the system and just needs to be cleaned.
Thanks,
David
With the weather getting a bit colder and the holidays here, it's resulted in me having to get up very early in the morning for work and taking the car instead of the bike. The issue with my 1980 CM400A is that after is sits for a bit, like a week, it'll have a hard time starting. I'm 99% it's from the carbs. It it sits for multiple weeks it becomes very hard to start. If the bike is ran on a regular, daily basis it starts up each morning just fine. For the hard starting I simply just keep cranking it over, applying choke doesn't help it, until it starts to cough and finally fire up.
The carbs were rebuilt, fully cleaned, and professionally synced early this spring. It would occasionally have the hard starting back then but I was riding it almost ever day and as long as it was ran daily, the hard starting rarely came up. The rebuild kit I used was not OEM as I was not able to find a true, full OEM kit. I kept the original jets and floats, the float needles were switched out. New air cuts offs, new accel. pump, almost new everything except for the O-rings that seal the tubes that allow fuel into the right carb as the kits O-rings were not the right size. I have new carb boots connecting the carb to the head, and the fuel line is new and very tightly installed. It seems like the carb as made the issue more pronounced.
I don't want to kill my battery or worse cause unnecessary wear to the started motor. I did run some fuel system cleaner through it a couple month ago which made the throttle response a touch better but did not help the starting issue. Any advise would be appreciated.. Heck probably a tiny speck of dirt got into the system and just needs to be cleaned.
Thanks,
David
