15-05-12, 09:56 AM
I'd take it for a spin to get it warmed up then let it idle for a couple of minutes.
Switch off and, once it's cool enough, check the plugs (the idea being to see if the bike's running rich when the throttle is closed).
If some are sooty it'll point to a carburettor problem: possibly a faulty choke plunger or slow-running needle/jets that need adjustment. If that is the case I'd recommend you take it to a qualified mechanic: inexpert fiddling with carbs can easily convert them from "almost OK" to useless.
Switch off and, once it's cool enough, check the plugs (the idea being to see if the bike's running rich when the throttle is closed).
If some are sooty it'll point to a carburettor problem: possibly a faulty choke plunger or slow-running needle/jets that need adjustment. If that is the case I'd recommend you take it to a qualified mechanic: inexpert fiddling with carbs can easily convert them from "almost OK" to useless.