KZ650-B3 cold cylinder at startup

MauserXR wrote:

Hi guys long time no post but hey bikes been good,
Anyway as title when I start the bike after a few days of standing cylinder 3 doesn’t seem to warm up, header is cold, plugs dry so you’d think no fuel, however after a while she warms the cylinder runs as it should and the bike doesn’t miss a beat? I pulled the carbs last year and fitted larger pilot jets and checked and cleaned the carbs as you would expect.
Don’t think it’s electrical and it’s so weird it does it after being stood for even a short period. I checked the fuel bowl and there was petrol present ?
Anyone had a similar fault ?
 

Injected wrote:

MauserXR wrote:

Hi guys long time no post but hey bikes been good,
Anyway as title when I start the bike after a few days of standing cylinder 3 doesn’t seem to warm up, header is cold, plugs dry so you’d think no fuel, however after a while she warms the cylinder runs as it should and the bike doesn’t miss a beat? I pulled the carbs last year and fitted larger pilot jets and checked and cleaned the carbs as you would expect.
Don’t think it’s electrical and it’s so weird it does it after being stood for even a short period. I checked the fuel bowl and there was petrol present ?
Anyone had a similar fault ?

 

Whenever I have engine run issues I always go back to check basics : compression/spark/fuel/timing
Yes I have dealt with the one cold cylinder issue.

You confirmed that there is fuel in the float bowl on that cylinder, good start. If no fuel on spark plug then nothing is drawing fuel into the cylinder.
What is the compression on that cylinder? Did you check the valve lash?

Being your own mechanic is like being a detective.