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wot do you mean by remove the powerband ? You can adjust it to come in sooner or later as required but its designed this way , get familiar in keeping the revs up above powerband and dont be scared ! P...
Need to know the year of the bike,but you may find that your powervalve is not working or lifting up to open the exhaust port fully.Does it rev cleanly otherwise?You could also have a carb issue if it doesn't.
I also find that if the bike has a high mileage the carbon build up in the expansion chamber will be too much and then it will need to be burnt out...this can improve the performance significantly.
Please leave some positive feedback for me if this solves your problem and get back to me if you need to.
You can experiment with different expansion chambers. The cone shape of the chamber bounces a sonic shock wave back to the exhaust port. The wave forms a pressure "wall" at the port to "seal" the exhaust port so intake gasses don't escape. Change the wall timing and you change the powerband. This is the expensive way and with no guarantees. The bike may already have the best possible chamber.
I suggest you go a different route. Just go up about four teeth on the rear sprocket or down one tooth on the front sprocket. This will mean the bike will have a lower top speed but more torque and earlier powerband relative to mph speed. Bottom line is you will come out of the hole quicker with higher revs and reach the powerband sooner. The loss of top speed is overcome by the speed out of the corners. Generally, more time is spent in first, second and third than the brief moments spent in fifth or sixth.
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clean out the entire airbox along with really clean out the air filter, use gas to clean the filter then rinse it out with warm water.iv been doing it for years, dont let anyone tell u otherwise, check the reeds, replace if needed, clean the powervalve. clean the carb. i dont no wat else could be a matter with the bike, unless its in the cylinder like no compression of broken or worn piston rings, who noes. get curious check **** out that away u dont have to waste ur time askin us. u no