AaronKyle432
XS400 Member
Hey everyone, I need some assistance.
Here is the backstory: I rode the bike 55 miles 8 days ago. Ran perfectly fine, other than it backfiring quite a bit when I let off the throttle. Started the bike 5 days ago and let it idle, started and idled perfectly fine too. All that I have done to the bike is cut off the exhaust right behind the foot pegs, and stock air boxes. Before the exhaust was cut off, the carbs were synced.
Now today, I go to start it and it won't start. It won't start will full choke, or half-choke either. It will only start with no choke, and if I have the throttle at about half way, and even then, it has a hard time revving up, but won't idle at all, even with adjustment of the idle screw. Took the carbs and took them apart. Blasted the holes and parts with air, but didn't soak them in carb cleaner or anything. Put them back on and still no progress at all. I sprayed some carb cleaner into the carb with the air box off and it idled fine and ran good for about 15 seconds, then went back to not running.
I took the plugs out and they were solid black. I bought some new plugs that were 1 step hotter. Bike fired right up and idled fine. So I took off on a ride. Started off fine, but quickly went downhill. It started to act like it was being starved of gas. I had it at full throttle and it was only going 40mph and barely chugging along. Sounded very bad too. Got home, and it turned it died. Tried starting it and it wouldn't even start unless i had the throttle open again. I took the plugs out and they were just a light brown/tan color. Not black, so I'm kinda stumped on what it could be now?
Do you think it could be the carbs need to be cleaned really well/synched again/re-jetted from the exhaust? Ignition timing? Something internally? Help please. Thanks
Here is the backstory: I rode the bike 55 miles 8 days ago. Ran perfectly fine, other than it backfiring quite a bit when I let off the throttle. Started the bike 5 days ago and let it idle, started and idled perfectly fine too. All that I have done to the bike is cut off the exhaust right behind the foot pegs, and stock air boxes. Before the exhaust was cut off, the carbs were synced.
Now today, I go to start it and it won't start. It won't start will full choke, or half-choke either. It will only start with no choke, and if I have the throttle at about half way, and even then, it has a hard time revving up, but won't idle at all, even with adjustment of the idle screw. Took the carbs and took them apart. Blasted the holes and parts with air, but didn't soak them in carb cleaner or anything. Put them back on and still no progress at all. I sprayed some carb cleaner into the carb with the air box off and it idled fine and ran good for about 15 seconds, then went back to not running.
I took the plugs out and they were solid black. I bought some new plugs that were 1 step hotter. Bike fired right up and idled fine. So I took off on a ride. Started off fine, but quickly went downhill. It started to act like it was being starved of gas. I had it at full throttle and it was only going 40mph and barely chugging along. Sounded very bad too. Got home, and it turned it died. Tried starting it and it wouldn't even start unless i had the throttle open again. I took the plugs out and they were just a light brown/tan color. Not black, so I'm kinda stumped on what it could be now?
Do you think it could be the carbs need to be cleaned really well/synched again/re-jetted from the exhaust? Ignition timing? Something internally? Help please. Thanks