Topic: CB650 WONT START WHEN COLD

[bullett500]

My 1981 CB650C will start instantly when the temp is above 70 degrees.  Below 60 and it wont start at all without a shot of starter fluid in the air flilter.  Any ideas?

[LesterPiglet]

Use the choke. :-D

[tomkimberly]

With the key off, twist the throttle twice, pull choke cable full all the way out, turn key on, hit starter button, it should fire right up.

Tom

[bullett500]

I've done that.  If I follow that exact routine about 20 times, sometimes it will start, but not very often.  It hits a couple of times then just turns over. 

[tomkimberly]

I've done that.  If I follow that exact routine about 20 times, sometimes it will start, but not very often.  It hits a couple of times then just turns over.

Then you need to clean your carbs, mainly the slow jet circuits.

What I did with my 81 was to replace the VB44A carbs with VB44B carbs (VB44C's will work as well) as they have screw in pilot jets.

Tom

[cb650]

Check the fuel auto shut off too.

[MoMo]

Also, make sure the choke cable is actually working- it may have become unhooked at the lower end...Larry