Hi I have a problem with my Derbi senda 97 model, the bike has had a lot of time put into it like recent magneto new, piston and barrel new, crank bearing and seal full engine gasket set the problem is it starts first or second kick I set off in 1st gear perfect plenty of power go to 2nd gear the same but I go into 3rd it starts to bog and power drops does try to pick up but the power should be there in all gears right ???. anyone know what it is? Could it be carb or jet maybe??? It's standard 50cc piston I have a 65 jet I'm pretty sure it has open air filter Doppler exhaust and the reeds are malossi I'm wondering wether it's air mixture or something please help
