[Motocharlie]

My CB900F will only run when I blow lightly down the air tube on the carbs? Help!!

 

[cmonSTART]

Hello Charlie, welcome! Can you tell us more about the bike? Year, background, did it sit recently? Is this a new issue?

It sounds like a fuel related issue, so if you haven't already try pulling the carbs and going through them.

 

[Motocharlie]

It’s a 1982 model and a us import I have been through the carbs and it runs really well when I lightly blow down the air pipe, but stops as soon as I stop blowing

 

[Motocharlie]

Could I have missed something?

 

[cmonSTART]

Ya, it's quite possible. I would double check the float level - make sure that is spot on.

Also check your valve clearance is spot on - it's a long shot but that can effect the vacuum in each cylinder, which will effect how much fuel gets pulled from the bowls.

Did you use rebuild kits when you did the carbs, new rubber and such? Any corrosion issues when you opened them up?

 

[SemiFast]

It’s a 1982 model and a us import I have been through the carbs and it runs really well when I lightly blow down the air pipe, but stops as soon as I stop blowing

"lightly blow down the air pipe" ???

I just gotta ask...
Say-What?