Hello my bike is only fireing on one cylinder right hand side put new plugs in and checked both plugs for spark and is all good any ideas? Looked in the manual but not sure what to check hope its not too bad! Thanks for any help in advance

The plug may not be firing under load so swap over the HT Leads and check what cylinder sparks now. My money would be on the RH Cylinder. Set the kill switch to off and turn it over a few times. Remove the plugs and check if they are wet. I would suggest the RH plug will be and the other dry, indicating a fault with the carb.....Is it a vacuum carb on the bike (my mate had one back in the day, but I cant remember what carbs were fitted)

Thanks for the reply! I will try that tomorrow and let you know cheers again

Done what you said both plugs where wet, put the plugs back in started first kick and was running on both cylinders not sure why maybe float was stuck ohwell fixed now!! Thanks for help

Good news matey, now post some pics of the Bike...I like the xs650 and would love to own one