Mudboat

Yes, I changed the in-line filter as well as cleaned the screen on the pickup tube in the fuel tank (a regular 6-gallon plastic boat tank). I also made sure that the tank is properly vented.

Thanks a bunch.... I'm not really hungry for power since the power is fine for my application. I'm really just hungry to get it running good...

Do you have any recommendations or part numbers for the intake and carb you mentioned?

I do not have any pictures of the boat. I never thought to take any. They are mostly 16' long, flat bottom, 32" wide bottom w/24" high sides toward the stern. Some have a tunnel drive. All are keel cooled (water circulates through a special set of radiators built into the hull and cooled by the sea water). The seat is mounted over the engine. There is a local manufacturer that custom builds these boats and rigs them according to the customer's specs. A fully rigged boat with an 82-84 model 1800cc engine sells between $11,000 and $14,000 depending on the bells and whistles installed. Some have an engine-mounted hydraulic pump and hydraulic steering. The boat has trememdous power for its size and can run in merely inches of water. Hydrilla and water lillys are no match. Designed for shallow marshes, the top speed is 35-40 mph depending on the weight.

First of all I would like to say hello to everyone in this forum. I'm new to the forum, but from reading through a few threads before actually registering, I can see that there is a lot of knowledge in here. Hopefully someone can help me with my troubleshooting issues of my engine. 82-84 model 1800cc Subaru engines are the most popular application for South Louisiana mud boats due to their size, weight and power. There are literally hundreds of these boats in my area. The engines are mounted inboard with a shaft through the bottom like most larger boats. A stick rudder steers the boat through the ditch-like runs in the marsh. Some engines are coupled to a 1-1 ratio marine clutch for forward-neutral-reverse, while others are a simple straight drive (start it and go).. Both work great in the marsh. Now for my specific problem... Here is what I know about my engine: Year - ? Size - 1800cc Carb - Carter/Weber TYF-7629S Disty - ? After sitting up for a few months, I took it out for a spin before hunting season to make sure it still runs ok. First thing I noticed was excessive smoke coming from the crankcase vent. I ran a compression check and found 40 psi in one cylinder. I changed the piston and rings. The cylinder wall was fine. Ran a hone through it, wiped it and installed the new one. While I had it in the garage, I decided to clean the carb, change the dist cap, rotor, wires, plugs, air and fuel filters. I put it back in the water and it ran fine through the no wake zone at an idle. when I started to get on it in open water, the engine would run great for about 30 - 45 seconds and then sputter before almost killing. If I let up on the throttle when this happened, it would go back to idle and run fine again. When I would start to get on it again, the same thing would happen. Here is what I checked and done so far: Changed the coil Checked timing - ok Pulled the top off of the carb and checked the float valve. - ok Changed the electric fuel pump I ran it again yesterday and it did the same thing. Frustrated, I went to Roo Builders web site last night and ordered a remanufactured carb. I also suspect that there may be a problem with the pickup coil or vacuum advance.. ?? Don't know.. Does anyone have any thoughts on what I can check next? I'm in a hurry because hunting season opens this coming weekend... Thanks in advance..