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mschwab
04-09-2010, 07:49 PM
Hello all i have been reading here a lot and now i need some help.

So i have the good motor of fc420v. When the motor is at high rpm it running bad and back smoke like the choke is on. I know it is not things i have replaced

plug
oil
gas
needle and seat
fuel filter
igniter
check valve adjustment
compression is at 90


If any one has any ideas pls let me know

rotti1968
04-10-2010, 10:16 AM
You have all of the above replaced , stupid question did you do the air filters also ? Clogged air filters will do this .

mschwab
04-10-2010, 03:18 PM
yes i did replace

rotti1968
04-10-2010, 05:59 PM
Its starving for fuel not getting from the tank,clogged line,clogged jet in carb etc.