mase

Here is the latest scoop.

Ran Seafoam through the carbs a couple of ounces and let sit. Then I fouled two sets of plugs so it definately loosened up the carbon. Put some in the fuel and the verdict is out on that.

Where I am is the starboard engine still only gets to 4500 RPM at 1/2 throttle. If I give it more gas the engine boggs down and falls back to like 3500 or so but when I pull back to the 1/2 throttle it goes back to 4500RPM. My carb is set at L=1 turn and H = 1/4 turn. The Port engine has it's carbs configured this way.

My engine is a 657X and does NOT have the RAVE valves. So I am back to the opinion that the exaust ports may have carbon build up which is limiting the top RPM.

My boat is a 1995 Speedster and it seems like there is a RPM limiter problem. Is there a way to disable the RPM rev limiter to test to see if this is the case?

If anyone has had a similiar issue and has a solution or any direction let me know.

Mase

For the past week i have changed and reset the carb settings and also changed out the plugs in my right engine.

The max speed I can get is 4500 rpm.

Out of the hole it will rev up to 5,500 and then slide back to 4500.

Cleaned the fuel filter and the compression is at 120 for both cylindars.

Does anyone have a clue?

My opinion now is clogged exaust ports.

Somebody give me a hint please.

Mase

My 95 Speedster with Twin 85HP engines has one engine that starts and runs great until it goes past 4,500 RPM. It just hangs at 4500.

The compression is 120 for each cylindar.

I have adjusted both the high and low speed jets to 1 turn H and 1 Turn low. The engine has twin carbs and seem to be syncronized based on throttle opening.

Changed out the plugs which looked fouled and reset the oil pump setting which was way to rich. After new plugs the RPM's went higher but then the engine surged between 4500 and 5500 RPM.

Now the engine just hangs at 4500 when given full throttle.

Does anyone have any ideas?

My thoughts are the fuel filter (I have not checked the in line filter) or the fuel pump?

My other thought would be since it was running rich on oil maybe the exaust ports are restricted? Is this a possibility?

Just need some guidance as my lower back is sun burned from leaning over the back seat to adjust the engine.

Let me know your thoughts.

Mase

While I was out this weekend there was an issue with my speedster not picking up speed and my left engine just did not push water correctly at hig speed. Also at high speed the rpm's jumped dramatically when i pushed the throttel past 4200 rpm.

What I found was a plastic bag lodged in front of the jet impeller.

Removed the debri gate and removed the plastic and back to full power.

Just wanted to post as it may bennefit others....

Mase