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To change the final drive belt on your Fatboy, first disconnect the battery. You have to drain the primary and remove the cover. Take the engine sprocket nut loose and remove the plate in the center of the clutch assembly. Remove the mainshaft nut that holds the clutch assembly on. This nut has LEFT HANDED THREADS. Then, remove the starter jackshaft. Go the right side of the bike and remove the exhaust system so that you can remove the starter. Then take the inner primary cover off. You may have to remove the front belt drive pulley. Since you're in this far, you may as well remove the pulley if you have the proper tools and replace all the transmission seals behind it. Then, remove the rear wheel and the swingarm. Do not bend the new final drive belt into a radius any tighter than about four inches or you may damage the cords inside the belt. You will need a torque wrench that is capable of applying at least 150 foot pounds of torque to the engine sprocket nut and torqe 60-80 pounds in the LEFT HANDED DIRECTION for the clutch assembly. The front belt drive pulley torques to 150-165 foot pounds as is also LEFT HANDED THREADS and you'll need a "belt pulley locking device" to hold it while you take the large nut off and put it back on. If you plan on doing this job, I would advise the purchase of a service manual as sometimes a picture is worth a thousand words.
You say that it did 70 after the belt was changed, this seems to indicate that the belt could be slipping. Either replace the belt again or get hold of some belt dressing which makes the belt grip better in the pulleys. Another thing to look for is a blocked exhaust port and muffler box plus look at your air filter to see if it is not perhaps restricting inlet air flow.
Have you removed the carby and removed the jets and cleaned them? also is the compression OK? Is the exhaust blocked...Try loosening off the 2 10mm nuts at the cly that holds the exhaust pipe, drop the pipe down a little and try for power. if its better the mufler is blocked..the outlet could have a nest in it or carbon and rust has blocked it.You can cut them open and clean them, but must have the tools and know how...
my boyfriend got a geely scooter 125 i think it is and he had exactly same problem, tappits need set to 0.5 and try cleaning the air filter only problem he got now is his indicaters are totalled and the geely site is closed down :(
I believe that is the alarm telling you to add more oil to the resevior. I have a 2003 geely as well, and my owner's manual says there is an alarm for when the oil is low. Use a good 2 cycle injector oil from a motorcycle shop to get the best performance and avoid problems.