Craftsman Snowblower only runs on choke
If everything else is cleaned like you state (no jets clogged, etc), then what's going on is the motor is being starved of fuel when you turn the choke off. Choke enriches the fuel/air mix. But if you had a situation where the motor was drawing in excess air, shutting off the choke will lean out the mix to the point where it stops igniting.
I'll bet you a sandwich that you need to replace the gasket between the carb and the manifold. You might be getting excess air in there after the carb, so the mix is unnaturally lean. This happened on my B&S 10hp pressure washer last spring. Once I replaced the gasket, it ran factory fresh. But if you're doing that, you might as well replace the jets. It takes 5 minutes.
Also, my fuel needle had two stages of jets, so inside the carb at the unchoked vacuum level it was pulling fuel through a lower set of jets, and in choke it pulled more fuel through another set of jets higher up the needle. If your carb was like my B&S, then maybe your lower jets are clogged, and the other ones aren't.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Last edited by Aggie67; 03-30-2009 at 04:35 PM.