2000 genesis 1200 carb rev limiter?

[Willisb]

Hi. Bought a 1200 genesis recently. Did a carb rebuild kit on each carb. Replaced all fuel lines. Took it out on water. Would not go over 3000 rpm. Started out of the water on the trailer, engine revved fine. Revved up to 6-7k rpm....sounded great. Doesn't make any sense.....any ideas? Thanks.

[K447]

Welcome

You need to determine whether all three cylinders are firing. Do they get equally warm?

Any messages on the MFI display? Reverse warning visible?

[Willisb]

Thank you! I think all the cylinders are firing. When on the trailer, out of the water, it revs fine. In water, red lines at 3k. Doesn't make any sense to me. Reverse and forward are working...no warnings....

[K447]

Thank you! I think all the cylinders are firing. When on the trailer, out of the water, it revs fine. In water, red lines at 3k. Doesn't make any sense to me. Reverse and forward are working...no warnings....

On the trailer without a water load on the jet pump the engine can rev up even with just one cylinder firing.

[Willisb]

Thanks again! I did some testing.....the rear cylinder starts machine with spark plug wire connected. The middle and front do not. Took all spark plugs out and connected wires. All 3 spark. All spark plugs seemed wet so I think they are getting fuel. I'm stumped.

[motokawa]

You should check for twist crankshaft , fly wheel (magnet) damaged or sheared key.

[K447]

Thanks again! I did some testing.....the rear cylinder starts machine with spark plug wire connected. The middle and front do not. Took all spark plugs out and connected wires. All 3 spark. All spark plugs seemed wet so I think they are getting fuel. I'm stumped.

Check the basics. Cylinder compression? Reed valves damaged?

Spark plug wires accidentally crossed?

[Myself]

Just cause the plugs spark laying on the head doesn't mean they spark when bolted in. Try new plugs, I've seen MANY that short out to ground.

[Willisb]

Thank you! Is it possible that since I replaced all the gas lines, I crossed a line? Is there a gas line diagram i can reference somewhere? Thanks.....

[K447]

... Is there a gas line diagram i can reference somewhere?.....

Have a look here, as a starting point.