My rockstr only runs on 51 cylinder but if a rev it it runs on 2 ,i have changed the plugs and cleand the injections so fare

Ford coil on plug systems are multi strike ignition (spark) under 1300 rpm then go to single strike a single cylinder misfire can be created by several things . #1 Test engine compression on a cranking engine compression it should be around 150 lbs but if gauge reads different COMPARE to other cylinders that work fine #2 check engine running compression this will be around 120 lbs then rev over 2000 rpm and check pressure drop again COMPARE to other cylinders that work fine. any drop would indicate valve train problems. #3 All internal engine is fine then external problems are present vacuum leaks and or fuel injection volume is low.

What are the fault codes. Also it is still missing when you rev it up, the increased engine speed masks the missfire.

STANDING IN FRONT OF VAN FRONT CYLINDERS FACING YOU LEFT TO RIGHT IS 4 5 6 BACK CYLINDERS LEFT TO RIGHT IS 1 2 3 GET A PIECE OF PAPER WRITE NUMBER 51 THEN WRITE NUMBER 62 UNDER 51 THEN WRITE NUMBER 43 UNDER 62 THATS YOUR COIL PACK WIRES LOCATION MATCH THEM WITH THE CYLINDER SPARK PLUGS YOU HOME FREE.

Thats not normal. You could get a bike off the show room floor and completely skip the break in period and it would run wide open. If your bike wouldn't rev past quarter throttle there is something wrong. With a blackened silencer and a motor that dies at quarter throttle I'd say you've got a problem with your injection system flooding your motor with fuel. I run 3 warm up and cool down rotations and go ride like normal. After 4 tanks of fuel your bike is more than broken in. If you aren't familiar with the injection system take it to the dealer and get someone to look at it. If you bought it new it should be covered as a manufacture defect.

is there power and pulse to coil 2&3 Cyl? rev counters run of the coil pulse.Number 2&3 cylinders are likely to be fowled now so replace plugs and retry (a fowled spark plug will never fire) it will only track

What maintenance have you done? Changed the plugs, air filter, oil, and such? I would get some sort of fuel treatment to run through the gas tank and carbs. This should clear up any partial clog in the fuel system.

check for play in throttle shaft on injection if badley worn you will be picking up air. is so replace injection pump

Change all the filters (fuel and air). check and see if all your spark plugs are firing or just change them. if it is fuel injected make sure your injectors are working. Hope something there helps get it running good.