Ported polished ftz pipe keihen carb. Starts and idles great. Cleaned the carbs cleaned and reoiled the K&n filter still will not Rev up. Any help would be great can't figure it out.

hello. forgot to mention you may want to check electrical connections from the cap to the plug and the bolts that ground wires to the ignition coil. the cap to high tension wire can go bad too. trim the wire and screw the cap back on.

do you have a fuel filter. if installed backwards it will starve for fuel. check to see flow direction. hope this helps.

ok then take a close look at the electrical connections. is the spark plug new. a fouled plug could cause the symptoms you describe. there is a sticky here with a manual that shows testing procedures for the magnito cdi and coil. i had a loose wire from my coil and it did the same thing. started up and ran but when i gave it throttle it would wanna die. the connection would go bad as soon as it started to vibrate.