I switched the exhaust on my 05 CRF450 to an FMF Megabomb with an FMF Powercore Q Series muffler a while back and have had some problems ever since.When I first changed it out starting was a major problem and there was a bad off idle BOG,I called FMF and explained what was going on and that I live at an elevation of 6773ft and they suggested dropping down on the pilot and the main 2 sizes which I did.However after doing so the starting problem had stopped but the bog was still there,so I installed a Boyesen QuickShot hoping to cure the problem but it is still there.The bike is Showroom condition with appx. 30hrs on it since taking it off the showroom floor so I don't want to go blindly around leaning out the jetting to try and cure the problem,if anyone has any insight on High Altitude jetting on a CRF450 with FMF exhaust any help would be appreciated.Thanks
