I´m a Harley Mechanic/Shop owner and one of my regular customers has alot of faith in me because I maintain and repair/service all 3 of his Harley Davidsons. Now he wants me to fix his 2006 CRF 450x Honda???? I´m like a fish out of water but I believe I can fix this bike. Carb has been rebuilt rejeted previously, new spark plug new spark plug wire. There is plenty of fuel, plenty of spark, but will not kick over to run. I´m thinking timeing chain? Any help on this?