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ok..so I switched from a 600 motor to a 750 motor over the winter. I finally got all the parts I needed to get it going..so I try her out today... it started but didnt sound right...so it turns out only 2 cylinders are running.

here is what we checked so far.

- added new gas
- new plugs (tried swapping plugs from the working cyclinders with same result)
- tried switcihg around the coil packs
- checked each cyclinder for spark (all getting strong spark)
- switched around the injectors with same results
- removed fuel rail and saw each injector working

It got dark so I will continue tomorrow. Can anyone suggest any other tests? We are going to do a compression test..Im gonna be soo pissed if the motor is messed up...
 

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First what are the results of the tests you did so far?
Is it still the same cyclinders not firing and did you visibly check to se if there is spark from all the plugs. Have the plug out of the hole and ground the body to the engine and watch for a spark. You can do that with all the plugs. If all the tests mentioned still have the same cylinders not firing then it figures the valves are messing up, injectors aren't squirting, throttle body valve not opening, and so on and so on. You have to figure what could it be and eliminate everything.
Since it is running but you figure missing try checking intake suction on each intake and if possible try to see if the carbs are balanced. If they are balanced then you know its probably not butterfly vavles, valves, cam, or your imagination. Even check for leaks in the head. the engines weren't designed over night or make that way so don't figure you'll get it right faster or get frustrated trying.

You are past the biggest hurdle of getting it to run. If its fuel injected it could be injector related so they are always keeping those cylinders from firing since gas is needed. Could be a fuel management erro by a pc3 or such or even wiring. Just keep plugging away.
 
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