Re: 1988 V20 with 225 Honda
 

the back of ur boat is floating in water and when you pull out it changes the yaw of ur boat. as the stern goes down, the bow comes up. if you cant hop on the trailer further out the water you should raise the bunks in the rear, or lower the nose roller. wich ever is easier on ur rig. also, are you absolutely positive you are reading mph and not knots? the throttle stop on the motor you were talkin bout, is it adjustable? ur second trip was 315 pounds lighter, same rpm, gained 2 mph. sounds like ur not at wide open throttle. and with only 100 hours on that motor, should you be?

Re: 1988 V20 with 225 Honda
 

How's she run, smooth or reall smoooth? Any chance she's only firing on 5 holes? Sounds to me like its time to see the tech.

Airslot

Re: 1988 V20 with 225 Honda
 

just a thought here and maybe I'm reachin out a bit,but, in addition to all other possible factors that are making the boat porpoise up and down, not reaching wot rpm, what appears to be low top end [43-44mph w/ a225???] could the t-top be pitched in the wrong direction???? Meaning is it catchin to much air and acting sorta like a parachute??? T-top, lotsa fuel[the tank is kinda aft,isn't it?] a HEAVY motor.....all that is certainly not any help if your looking to keep the bow down. Bottom line is that 225 should get you a least 50-55mph and about 900 more rpms. Airslot brings up a good point as well, I think it may be hard to tell if its not firing on all six, not being to familiar w/ the motor,it may be possible to overlook ???

Re: 1988 V20 with 225 Honda
 

Thanks for your comments!
I am going to take the boat to the weigh station today. Just had the 100 hour checkup done on the engine. The mech said it was fine. It's a small dealership, and they don't have any equipment that hooks up to the Hondas to check whatever.
He also checked for full throttle and said it was wide open when the throttle lever (on the center console) was pushed all the way forward. The WOT stop on the throttle body is NOT adjustable - there is just a part on the TB that sticks out, and the rotating mechanism just hits it.
Yes, I am sure the speed is in MPH - I have a speedometer on the console and it reads about the same as the GPS.
I'll see if I can figure out how to disable one cylinder at a time.
The motor starts right up and runs very smoothly (at all speeds).
The mech said he thought it might be the hull??
Will report more after the weigh-in.

Re: 1988 V20 with 225 Honda
 

sounds like you need some trim tabs bruddah.

Re: 1988 V20 with 225 Honda
 

If you don't feel a miss at idle to over 5k rpm, you don't have a miss. *If you're still running a 17" pitch prop on a 225 on a 20' boat, I still feel that's your problem. *The previous owner may have been happy with 42 mph. I just repowered with another 150 hp with a 17" four blade prop and I hit 44.7 mph by gps. *It would be faster by about 2 mph if it was a three blade prop. *As mentioned before, my prop came off my 225 hp that was installed on a 97 sea ray laguna 24' boat. *It was alot heavier than my V20 and it ran at 47 mph. *On the 150 hp I hit 5500 rpm which is the max for my engine. *If you haven't yet, I'd talk to a prop shop before I'd tear into other things. *Do a Yahoo search for honda outboard motor test and click on fiberglass, 225 hp and the lowest pitched prop on a 20' boat was 23 and most with a 25" pitch. Some are go fast boats, but look at the pitchs on the 23's. They aren't 17" props. Just my $.02.

Re: 1988 V20 with 225 Honda
 

Just got back from the weigh station. Put the trailer wheels on one part and the front crank wheel on another slab.
Here's what I got:
460 lbs one the front and 4360 on the axel. Total 4820 lbs.
Engine - 610; Ttop & box 130; gas 60 gals @ 6 lbs per = 360; misc gear ~ 200; 2001 galvanized single axel trailer ~ 700. 2000 total lbs (excluding the boat). The boat must weigh ~ 2820 lbs.

Re: 1988 V20 with 225 Honda
 

I think you have water in your hull. maybe waterlogged foam???

Re: 1988 V20 with 225 Honda
 

I'd think the trailer is about 900 and that your hull is fine. Just my .02.

Airslot

Re: 1988 V20 with 225 Honda
 

Even if he estimated 300lbs. under, he's still 500 lbs. more than it should be??? Sounds as if the engine is running right, what else could it be besides extra weight?