Guests - If You want access to member only forums on HSO. You will gain access only when you sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
Rivernut

Boat hopping.

21 posts in this topic

14ft.jon, 25 Yamaha. Planes out right now, but when wide open it starts hopping, like wave jumping. Water can be dead calm, still hops. Gets sslowly worse, eventually have to ease back on throttle to get it to settle down. Is this a weight issue? Gas tank and battery both in back. Really no weight up front. Just got this spring, still getting use to it. Thanks for any help.

Share this post


Link to post
Share on other sites

Throw some weight in the front until it rides right. The thing with Jon's is there is more surface area on the front hull hitting the water which might lead to porposing like you have mentioned. Good luck.

Share this post


Link to post
Share on other sites

I ditto that. Mud motor guys have issues with that alot. Weight balance is very important on jon boat for sure.

Share this post


Link to post
Share on other sites

Thanks for the replies, already moved battery up front.

Share this post


Link to post
Share on other sites

I suspect that you already have your motor trimmed down as far as you can. Perhaps you could somehow block the motor to tilt it further down. When I mounted the 40hp on my Lund Rebel I had trouble. I loosened the bolts and added washers under the top ones to tilt the motor head back more. A little trial and error until I found the number needed.

Share this post


Link to post
Share on other sites

Its not trimed down all the way, but it planes out immediately. That tells me its trimmed correctly. It just hops at full throttle, eventually.

Share this post


Link to post
Share on other sites

Could be shaft is to long and pushing back up and down , or to big a motor for boat. I had this type of problem and it was because to much motor for the boat. I would try what others said and move weight up front and see what happens. Be careful as it can get hard to control if you get to much weight up front and rear lifts up under full throttle. You may have to downsize motor.

Share this post


Link to post
Share on other sites

Would a foil on the motor eliminate the bouncing?

Share this post


Link to post
Share on other sites

It would help to plane the boat out, but that isnt a problem.

Share this post


Link to post
Share on other sites

Its not trimed down all the way, but it planes out immediately. That tells me its trimmed correctly. It just hops at full throttle, eventually.

The hop means your trim is not low enough. Try lowering it some and see how it behaves.

Share this post


Link to post
Share on other sites

After checking the weight/load of the boat. I would make sure the motor is Centered. I have witnessed it a few times. Take out the tape measure.

river-rat4

Share this post


Link to post
Share on other sites

I would bet that the shaft of the motor is too long for the the transom of the boat. Check to see where the cavitation plate on the motor is in relation to the bottom of the boat. If its much below the bottom of the boat the motor has too long of a shaft.

Share this post


Link to post
Share on other sites

Originally Posted By: Rivernut
Its not trimed down all the way, but it planes out immediately. That tells me its trimmed correctly. It just hops at full throttle, eventually.

The hop means your trim is not low enough. Try lowering it some and see how it behaves.

This would be my first move.

Share this post


Link to post
Share on other sites

20" transom= longshaft motor. Its a 1442 Alumacraft, rated for a 30 hp. Run a 25hp. I"ll try trimming it down. I do have 2 more settings to drop. A guy on the river yesterday said it was because it was trimmed down too far. Almost forcing the front down , causing the hopping. I will post how it turns out. Thanks for all the input, greatly appreciated.

Share this post


Link to post
Share on other sites

If after you have trim your last two settings and it still does this then add weight to the front of the boat like useing your gas tank or battery to equal the load.

Share this post


Link to post
Share on other sites

trim it down and that should help, I think they call it porpoising (sp?).

Share this post


Link to post
Share on other sites

A guy on the river yesterday said it was because it was trimmed down too far. Almost forcing the front down , causing the hopping.

Your trimmed too high for how the weight in your boat is distributed. Trimming the motor down, should actually get you on plane faster and help keep your bow down and reduce the chance of porpusing. Your boat is light and you might need to readjust some weight forward to totally eliminate the porpusing. You MAY or May not loose top end, but it will be a safer and more enjoyable ride. Good luck. Junky..........

Share this post


Link to post
Share on other sites

Took the jon out today, trimmed it down one notch. That was all it took, you were right. It planed out immediately and didnt porpoise. Looks odd, but works. Didnt notice loosing any top end. If it did, it is minimal. Again, thanks for the help. Mike

Share this post


Link to post
Share on other sites

Took the jon out today, trimmed it down one notch. That was all it took, you were right. It planed out immediately and didnt porpoise. Looks odd, but works. Didnt notice loosing any top end. If it did, it is minimal. Again, thanks for the help. Mike

I love hearing that grin

Glad I could help smile

Share this post


Link to post
Share on other sites

Mine will hop a little had full speed, I just trim the motor down a little and it stops hoppin'.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0



  • Posts

    • I know I didn't pay $28 each for the trolley. Maybe half that. On the lake so I can't look up where I got them right this second.    Menards has the strut channel and a bunch of accessories. 
    • Strut is $15 per 10' at Menards. I've bought the trolleys from Mcmaster Carr before. Looks like they are $25 each on there for the doubles.
    • Dave -   I will go back to your original question and skip over everything after that.    You provided an explanation yourself.  In this case was the cross a representation of Jesus dying?  Or was it simply a representation of a soldier dying in battle.  I would say that a cross in a veteran's memorial traditionally represents the second scenario.     I would agree, to me this display is not religious.  Of course, as a Christian, I may be biased in my view.     I can't answer that for you.  However, we seem to live in a country where being offended can be considered a lifestyle.     We do have a separation of church and state.  The writers of the Federalist Papers wanted to make sure that our government did not have a government sponsored church like the Church of England.  I would not be happy with my government telling me how to worship.  So, I am happy that there is a separation of church and state. 
    • How many sleds can "we" get in that new trailer?
    • It's the interwebs. There is someone somewhere telling you what you want to hear no matter what that is.
    • Well how was the ride? I got my enclosed trailer ordered up today and will be here when I get back.
    • And who will decide what is good and what is not good for America? It seems there are opposing views for each perspective.
    • I have never heard this before and It is interesting.
    • There is also a separation of church and state. Put whatever you want on private property but keep religion out of the public arena.   Or are you also against the Texans who passed regulations making Sharia law illegal. Is it OK to have the Koran posted in a public area and to have rag heads praying to Allah in the government buildings?
    • We have a lot of shows going on this winter and spring that we'll be displaying at. Make sure to follow us on our Facebook page to stay up to date on all of those events...   Thorne Bros Facebook - CLICK HERE   Always great to see HSO members at these events so stop by and say hi!!   Thanks for all of the support!!
  • Our Sponsors