Hello,

I have a 2005 Bruteforce 750 with about 40 hours. Started it up and it will barely stay running and with I give it gas it backfires and wont speed up - feels like something is really wrong. I have cleaned the carbs and there was a little tarnish but not much and it still runs the same. Please if anyone could give me some advise before I take it to Kawasaki and pay out the A$$

Thanks,

Aaron

 

how old is the gas? try draining/siphoning and refilling. This will do amazing things if it is old. Have you pulled the plugs to check and see if they are fouled? How long has it been sitting?

 

Hello,

Drained and added new gas, plugs look fine. It is the strangest thing

 

Hello,

Drained and added new gas, plugs look fine. It is the strangest thing

 

Hello,

Drained and added new gas, plugs look fine. It is the strangest thing

 

hmm... air filter clean? I know these are simple things... but simple things first. if not, i may suspect the coil or other ignition parts. anyone else have any ideas?

 

Have the Uni spray cleaner and oil, its clean. I am not a deep water or mud rider...doesnt make any sense. Anyone Kawasaki techs in Dallas that wants some work just send me a message.

 

Try swapping out the cdi. It hasn't tripped the belt sensor has it?

 

I was reading some of the service manual last night and I was wondering if anyone has played with the syncro screw. I have not way to check the cdi so I want to make sure I have looked at everything else before I buy one.

 

I wouldn't touch the synchro screw between the carbs. If it isn't the problem then it can be a bitch to get it right without vacuum gauges. I need more info. Does it run better at partial choke? Full choke? Choke off? If it's backfiring through the carb, it's running lean. If backfiring through the exhaust, it's running rich. More than likely it is running lean, due to the EPA having a hand in its tuning. Before messing with the carb, make sure the valves are adjusted correctly. Valves too tight can make the V-twin run like crap. Hard starting and poor performance. Most are tight from the factory. Afterward, you can try to turn your mixture screws (bottom of the carbs) out a bit more than stock. This only adjusts the idle performance, and does nothing for mid to upper RPM. For mid RPM, I've shimmed my needles in the slides .030 inch with washers. This richens up the idle to mid range transition. A smarter solution is a Dynojet kit with its notched needles for adjustment. Upper RPM is handled by the main jet, and some guys will richen this up with a larger one, but only if lean in that range. When adjusted right, it's a monster. When adjusted wrong, it's just a disappointment.

Sorry for the long post.