Hello again... I've done a lot of testing and am still not at max operating rpms or on plane. I didn't see my original post show up at the top of this thread, but the problem is that i cannot get this motor to push this boat..? It's just plowing water and won't plane... or if it is on plane, it's so subtle you cannot tell.
Boat 1998 Blue Wave 165 Super T (originally sold with Evinrude 50hp 2 stroke mounted all the way down)
Motor 2004 Yamaha 60hp 2 stroke.. 60TLRC
Prop 4 blade stainless 14 pitch 13 1/4" Yamaha K series
I'm completely discouraged at this point, but here's where I'm at after posting this thread last year:
1. Took motor to mechanic, everything checked out fine.
2. Borrowed prop from him 3 blade 15 pitch.. no plane
3. Went to prop shop.. 3 blade 13 pitch, 3 blade 12 pitch, 3 blade 11 pitch all no plane
4. Raised motor to highest hole on transom, better rpms, but no plane.
5. Put on a permatrim. No change.
6. Got a fixed jack plate (TH marine hi jacker) moved motor all the way up. Still better but still plowing water.
7. Took motor to big boy boat/Yamaha dealer. They said carbs are dirty and motor deprived of fuel. They did carb job and confirmed that motor is getting up to 5500rpms in test tank (by the way, what does that even mean? Does a test tank put an actual load on a motor?)
8. Back to lake this past weekend. Completely new ethonal free fuel and carb job. Most i could get before losing grip from trimmimg up is 4300rpms/23mph. That felt amazing, but still seemed like it's not popping up on plane, or if it is, it just going really slow. I know 23 is pretty good for that motor on that boat, but I'm thinking rpms should be up around 5200-5500. Im losing all my top end rpms. Basically pushing the boat like a 40hp motor would.
What should I try next?
I have a new fuel pump coming tomorrow. I also bought a new 6 gallon fuel tank and fuel line. After this past carb job, I did find that there was very very minimal room for adjusting carb butterflies to wide open. I mean just a slight amount. I adjusted it, but would like to think that the dealer did appropriate link and sync and made necessary adjustments...?
If it's fuel restriction, what else can I check?
Should I go up in prop pitch to get that last 1k rpm? 15,17?
Spark is jumping 7/16 gap. Compression is 130,130,122 bottom. New plugs.
Should this be moved to Yamaha motor forum? Or could it still be a prop issue?
I have not yet weighed the boat... when I first got it a year ago, I took everything out/off and repainted the inside. With the boat completely stripped, I was able to pick the back of it up off the trailer and adjust how it rode on trailer. Im a small guy and 850lbs is a lot of weight.
Also did not do cylinder drop test as suggested. Is this something the dealer would have checked? Shall I still do it? Mild load as in 3 mph? Or 10 mph? At what rpm?
Thanks for all the help and suggestions so far... I just know this is going to end up being something simple. I am just not an outboard mechanic and don't know what to look for.