Alan461

Thanks for your support fellas Getting the carbs off took me three hours this morning, idle jet was blocked, cleaned it out with a tiny bit of wire. Everything went back together without anything broken, started ok with a bit of choke, let the headers cool then did the heat comparison and all four were equal along with resumed smooth running. Youtube was useful although it seems working barefoot is the norm of which I didn’t partake.

Thanks for the reply, I’m in Leicester. Going to clean the carbs, looks like a blocked jet etc.

Hi folks, 1st post on here Never owned a bike before or tried to fix one but worked on cars a lot (efi and old school carb) Passed mod 2 yesterday so when it stopped raining this lunch time went for a blat around the local roads on my newly purchased cbr. After a while it started to run a bit lumpy so brought it back home to see what was wrong. Turns out it’s not firing on the n/s cylinder, guess it would be number 4 if you looked at it from the front. Spark plug is clean and makes a spark when in the coil plug thing, (don’t know what it’s called) From nearly cold it will run lumpy and the other three exhaust pipes get too hot to touch in a few seconds but no.4 stays cold. If I gently bring in the choke it starts to run evenly and the no.4 pipe gets hot. Carb fault is my guess but it all looks a bit complicated and scary to take to bits Any suggestions to sort this out? Many thanksin advance