Good Morning!
I have a Alpha One Gen Two with a 3.0 inline 4 (1992).
I have done a ton of work on this boat, and in May\June, I had the upper replaced with a new SEI upper as the gears were shot and I was just done with it.
Fast forward to now. After a busy year, we finally finished break-in. I go to open her up, smoothly accelerates until about 2/3 into the throttle and then the RPM just sits there at about 2500 RPM. I can watch the throttle cable moving throughout the entire arc of the throttle swing.
Thought, it could be the carb, even though it was rebuilt 2 years ago - and I rebuilt the carb again (mind you, had ZERO issues accelerating BEFORE the upper swap). Took the boat out this weekend, same thing. Gets to 2500 RPM and SITS there. Cannot plane, do not pass go, do not collect $200. I also replaced the spark plugs, engine oil and fuel\water separator at this time.
I had previously popped open the cover after reading about ratio issues and I swear that the drive gear looks like the teeth spacing is different than what my old one was. I have done a lot of reading about ratios and I wanted to ask this.....
IF - (And I understand this is a big IF) the mechanic installed a drive with say, the 1.54 ratio instead of the 1.98 (I know the ratios were updated, but bear with me here), could this explain the sudden RPM loss? I hesitate to say it's the fuel system, or something went south in the engine, when this worked just fine before the SEI upper was tossed on.
If you think I should start looking at all of the cylinders, etc., I will definitely do so - but I am in SE Michigan and boating season is rapidly dwindling for me to figure this out.
I have a Alpha One Gen Two with a 3.0 inline 4 (1992).
I have done a ton of work on this boat, and in May\June, I had the upper replaced with a new SEI upper as the gears were shot and I was just done with it.
Fast forward to now. After a busy year, we finally finished break-in. I go to open her up, smoothly accelerates until about 2/3 into the throttle and then the RPM just sits there at about 2500 RPM. I can watch the throttle cable moving throughout the entire arc of the throttle swing.
Thought, it could be the carb, even though it was rebuilt 2 years ago - and I rebuilt the carb again (mind you, had ZERO issues accelerating BEFORE the upper swap). Took the boat out this weekend, same thing. Gets to 2500 RPM and SITS there. Cannot plane, do not pass go, do not collect $200. I also replaced the spark plugs, engine oil and fuel\water separator at this time.
I had previously popped open the cover after reading about ratio issues and I swear that the drive gear looks like the teeth spacing is different than what my old one was. I have done a lot of reading about ratios and I wanted to ask this.....
IF - (And I understand this is a big IF) the mechanic installed a drive with say, the 1.54 ratio instead of the 1.98 (I know the ratios were updated, but bear with me here), could this explain the sudden RPM loss? I hesitate to say it's the fuel system, or something went south in the engine, when this worked just fine before the SEI upper was tossed on.
If you think I should start looking at all of the cylinders, etc., I will definitely do so - but I am in SE Michigan and boating season is rapidly dwindling for me to figure this out.