2005c50
XS400 Member
Hello,
My name is Paul and this is my first post. I've been riding (legally) for 45 years and working on bikes longer. I currently own 9 bikes of varied breed, but my current project is a 1980 XS400. My concern is an intermittent off idle miss that occurs after 5 minutes of run time and progressively gets worse as the engine heats up. The bike starts on the first kick and after running on choke for a short time will idle and accelerate smoothly, but the warmer it gets, the more often it will misfire. If I run it long enough and shut it off, it will not restart until it cools down.
Here's what I've done so far:
Carbs cleaned and all passages checked for unrestricted flow
Diaphrams good and slides operate smoothly
Carbs synced to within .5 inch of vacuum
Carb boots sealed and leak checked on carbs and head
The misfire has been verified as electrical using inductive timing lights on high tension leads............ (continued)
My name is Paul and this is my first post. I've been riding (legally) for 45 years and working on bikes longer. I currently own 9 bikes of varied breed, but my current project is a 1980 XS400. My concern is an intermittent off idle miss that occurs after 5 minutes of run time and progressively gets worse as the engine heats up. The bike starts on the first kick and after running on choke for a short time will idle and accelerate smoothly, but the warmer it gets, the more often it will misfire. If I run it long enough and shut it off, it will not restart until it cools down.
Here's what I've done so far:
Carbs cleaned and all passages checked for unrestricted flow
Diaphrams good and slides operate smoothly
Carbs synced to within .5 inch of vacuum
Carb boots sealed and leak checked on carbs and head
The misfire has been verified as electrical using inductive timing lights on high tension leads............ (continued)