sextonjd99
04-18-2007, 07:48 AM
I installed a 450r carb on my 1999 400ex and I'm having troubles getting it to run right. I've got a full yoshi system and a K&N, 50 pilot, 190 main, 3 clip, 3 turns of air screw.
Ok heres the deal, Easter weekend go riding, 40 degrees or so, ran awesome on the top end but was getting popping and backfiring on decel and was sluggish in low rpms. I pulled the plug and it was white, which i though i means running lean, so i ordered a 52, 55 pilot.
Now last weekend with the same settings as weekend before, it will idle fine but will backfire through the carb if i give it any gas. I checked the plug now and its all black. I did a compression and it read 110psi. I checked the valve clearance. They were off a little but didn't help when changed. I've checked for air leaks with carb cleaner, and didn't find any. I've completely taken carb apart and cleaned and blew out with air.
Anyone have any ideas on what to check next?
Ok heres the deal, Easter weekend go riding, 40 degrees or so, ran awesome on the top end but was getting popping and backfiring on decel and was sluggish in low rpms. I pulled the plug and it was white, which i though i means running lean, so i ordered a 52, 55 pilot.
Now last weekend with the same settings as weekend before, it will idle fine but will backfire through the carb if i give it any gas. I checked the plug now and its all black. I did a compression and it read 110psi. I checked the valve clearance. They were off a little but didn't help when changed. I've checked for air leaks with carb cleaner, and didn't find any. I've completely taken carb apart and cleaned and blew out with air.
Anyone have any ideas on what to check next?