I have Suzuki rf600 I just put new fuel pump on it and CDI box now it wont start and is backfiring please anyone

check fuel pump --filter--cdi https://www.atvrepairmanual.com/suzuki-eiger-400-repair-manual/

Yes abad ign module cud b issue. Also wrong heatrange for plugs. Timing may hav slipped on flywheel or chain. Poor compression also. Put som BG intank to clean fuel system. Buy aclymerbook for complete upkeep&rebuild

did you drain the fuel line is the fuel pump electric you may be able to disconnect fuel line near engine and pump fresh fuel through the fuel line by powering the fuel pump while putting the old fuel in the lines into a fuel container.

its fuel injected and mine does the same thing for backfiring. as for half throttle. you closed the choke after it warms up. and might need to check the air cleaner maybe the plugs need to be changed. not sure.

Back fire is usually timing

It could be many different things. Check Fuel pump, make sure you have clean fuel filters, spark plug... make sure your getting fuel coming out of fuel pump by disconnecting fuel line coming OUT of pump & start Cushman if fuel comes out steady stream pump works good. Add some Fuel Stablizer w/ new gas this will help your fuel system dramatically..

First check ignition fuse and emergency shutoff switch (kiil switch) then check power into CDI and run spark plug back to coils and check for damage.