as usual, karma has had it's swift revenge on my bragadiccio on how clever I am changing my sparkplug.
I hopped on my scoot to ride home from work tonight and opened it up around a corner and got a whole bunch of misfiring, surging and backfiring.
As long as I kept the throttle below half it ran fine, but as soon as I hit it (and as I understand it, the main jet kicks in) it ran like a three legged goat.
First thing I thought was the main jet was partially blocked.
I pulled the carb, without disconnecting anything, removed the float bowl, there was a tiny bit of black muck in the bottom of the bowl.
I removed the main jet, looked clean, removed the atomiser, looked clean, pulled the needle and diaphragm (sp?) from the top, blasted everything liberally with carb cleaner (I have some for my Lambretta :? )and put it all back together.
Now it's even worse....
I kept the hose from the aircleaner off to try and feed carb cleaner into it while it ran, I did get it started, was able to rev it quite a bit, but it started bogging badly and finally died.
I pulled the fuel line off the petcock, under the gas tank but it wasn't dripping fuel, so I re-attached the hose and tried to start it again, no luck.
I noticed there was a lot of gas leaking back out, or, more like pooling in the air intake body, where the hose from the airfilter attaches.
why is gas leaking up there?
Is it the float valve needle or do I need a new gastap?
I've read of similar behaviour before that was caused by a worn out gastap, it's a vacuum affected diaphragm, I believe, but there was no gas leaking out of it when I removed the fuel line.
sorry about the novel here, just trying to give all info in case something rings a bell with someone.
I have 13000 miles on it btw.
any and all suggestions and heckling gladly appreciated ,