Last fall boat worked great but I was getting oil in the antifreeze ( head gasket ). So far this spring the head has been removed, decked, and a valvejob. Re-installed with new timing belt, plugs, wires, cap & rotor. Carb was sprayed down with some cleaner but no adjustment made and reinstalled with new base gaskets. Runs great in the bucket in the driveway. Timing is bang on at 10deg, and appx 850 rpms at warmed up idle.
Finally made the first splash of the year yesterday. Started fine, pulled away from the dock nice and smooth. Once I left the no-wake zone and gave it more throttle I was expecting to reap the fruits of my labour but it fell flat. Wont rev past 2000-2500 rpms or so.
Bumped the timing ahead, retarded it, replaced all the plugs, wires cap & rotor with the old ones in succession all with no effect. I even pulled the exhaust bellows off the manifold. The prop is the same one from last year.
Still spent a couple hours out fishing on the water between tinkering and it runs fine below 2000 rpms under load. In neutral it will rev with no issue. Attempting anything above 2000 rpms under load and you can hear the valves are starting to clatter.
Once home I put it back in the bucket and it will rev as high as I want with no ignition breakdown or delay. I broke out the timing light and its advancing as the rpms increase ( I didnt check total timing ) so the advance weights in the distributor are free.
Its points ignition but they would have to be really out to cause problems under load which would be apparent when running in the bucket ( not under load ). It runs so smooth I can set a glass of water on the breather at idle. I sprayed some carb cleaner and then some propane but cant detect a leak anywhere. If it were a car I would say the cat convertor is plugged.
Kinda stumped. I would but the pertronix ignition but I dont know if that will fix the problem.
I was having issues starting with the old timing belt so I purchased a new one. With the new one installed the engine started right away. Could it be a couple teeth off and still start and run ?? Maybe fuel related ?? I put $40.00 of 93 octane last weekend to help offset last years fuel. I pulled the fuel canister filter and although not spotless it looked OK to me.
Finally made the first splash of the year yesterday. Started fine, pulled away from the dock nice and smooth. Once I left the no-wake zone and gave it more throttle I was expecting to reap the fruits of my labour but it fell flat. Wont rev past 2000-2500 rpms or so.
Bumped the timing ahead, retarded it, replaced all the plugs, wires cap & rotor with the old ones in succession all with no effect. I even pulled the exhaust bellows off the manifold. The prop is the same one from last year.
Still spent a couple hours out fishing on the water between tinkering and it runs fine below 2000 rpms under load. In neutral it will rev with no issue. Attempting anything above 2000 rpms under load and you can hear the valves are starting to clatter.
Once home I put it back in the bucket and it will rev as high as I want with no ignition breakdown or delay. I broke out the timing light and its advancing as the rpms increase ( I didnt check total timing ) so the advance weights in the distributor are free.
Its points ignition but they would have to be really out to cause problems under load which would be apparent when running in the bucket ( not under load ). It runs so smooth I can set a glass of water on the breather at idle. I sprayed some carb cleaner and then some propane but cant detect a leak anywhere. If it were a car I would say the cat convertor is plugged.
Kinda stumped. I would but the pertronix ignition but I dont know if that will fix the problem.
I was having issues starting with the old timing belt so I purchased a new one. With the new one installed the engine started right away. Could it be a couple teeth off and still start and run ?? Maybe fuel related ?? I put $40.00 of 93 octane last weekend to help offset last years fuel. I pulled the fuel canister filter and although not spotless it looked OK to me.
