PontoonStuff Forum: kartracer28 rebuild project!!! COMPLETED

Active Topics Display List of Forum Members

Memberlist

Help

Pontoon Rebuild Projects
PontoonStuff Forum : Pontoon Rebuild Projects

Topic: kartracer28 rebuild project!!! COMPLETED

Author

Message

<< Prev Topic | Next Topic >>

kartracer28
Senior Member

Excellent Member of the Month Club 9/09

Joined: 02/13/2009
Location: United States
Online Status: Offline
Posts: 452

Posted: 07/04/2010 at 9:52pm \| IP Logged

Went out with the 115hp 4 stroke Yam today,, compared to the 2 stroke, at WOT lose 6 MPH BUT used 50% less fuel. It seems that the 4 stroke is about 500RPM slower than the 2 stroke.

Why when I trim the motor up I do not gain RPM and lose speed????

__________________
Houma Louisiana "Home Of The 2010 Cajun Toon Gathering"
1994 Monitou 24Ft WHAT'S NEXT
Yam 115 4 Stroke

rickdb1
Admin Group

Joined: 07/05/2008
Location: United States
Online Status: Offline
Posts: 2101

Posted: 07/04/2010 at 11:06pm \| IP Logged

I'm surprised you lost 6 MPH. If your RPM's are down 500, you might need a different prop with less pitch. What are the wide open RPM's? Might also need to raise the engine up on the transom some. The 4 strokes are heavier and will make the back end of the boat sit a little lower in the water, along with the prop..

__________________
Rick

2007 Bentley 200 Cruise
Merc. 90 HP 4 stroke
Mo.

kartracer28
Senior Member

Excellent Member of the Month Club 9/09

Joined: 02/13/2009
Location: United States
Online Status: Offline
Posts: 452

Posted: 07/05/2010 at 7:51am \| IP Logged

Thanks Rick WOT 5200 and I was also thinking of lifting the engine as it is in the lowest position. I put the same prop on the 4 stroke that I had on the 2 stroke. The 500RPM drop is that at 3800(2stoke) I would run 18MPH now I have to run 4300 to run 18. Is the common with a 4 stroke

__________________
Houma Louisiana "Home Of The 2010 Cajun Toon Gathering"
1994 Monitou 24Ft WHAT'S NEXT
Yam 115 4 Stroke

kartracer28
Senior Member

Excellent Member of the Month Club 9/09

Joined: 02/13/2009
Location: United States
Online Status: Offline
Posts: 452

Posted: 08/04/2010 at 8:40am \| IP Logged

DO YOU EVER FINISH!!!!!

Had a cover maded,,, used the Arnall PVC support system very EZ and quick to install.Had a front deck cover made so that playpen cover can be installed or removed when boat is in water.

Picture taken before all snaps fasten:::

__________________
Houma Louisiana "Home Of The 2010 Cajun Toon Gathering"
1994 Monitou 24Ft WHAT'S NEXT
Yam 115 4 Stroke

darrklim2
Admin Group

Excellent Member Of The Month Club 7/08

Joined: 04/15/2008
Location: United States
Online Status: Offline
Posts: 768

Posted: 08/04/2010 at 9:05am \| IP Logged

Did you raise your engine? Is the 4 stroke at the same mounting height as the 2 stroke was?

__________________
Darren
Alexandria, Minnesota, USA
'91 Forester 24' Fish 'n Cruise
'90 Johnson GT 100
2004 Chevrolet Silverado

kartracer28
Senior Member

Excellent Member of the Month Club 9/09

Joined: 02/13/2009
Location: United States
Online Status: Offline
Posts: 452

Posted: 08/04/2010 at 11:49am \| IP Logged

Darren

Engine is at the same height,, working with props as the 4 does not have the ump as the 2. I think we got the prop worked out, I lost about 4 MPH with 4 stroke, BUT uses about 40% less fuel. Going to lift engine shortly

__________________
Houma Louisiana "Home Of The 2010 Cajun Toon Gathering"
1994 Monitou 24Ft WHAT'S NEXT
Yam 115 4 Stroke

darrklim2
Admin Group

Excellent Member Of The Month Club 7/08

Joined: 04/15/2008
Location: United States
Online Status: Offline
Posts: 768

Posted: 08/04/2010 at 12:17pm \| IP Logged

I am almost willing to bet that rasing the engine should get your speed back. From what I have seen in the past anyway. This might also affect the prop pitch required though.

__________________
Darren
Alexandria, Minnesota, USA
'91 Forester 24' Fish 'n Cruise
'90 Johnson GT 100
2004 Chevrolet Silverado

If you wish to post a reply to this topic you must first login
If you are not already registered you must first register

<< Prev Page of 8

Printable version

Forum Jump

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Site Map

Links

Univeral Pontoon Boat Bimini Top Fabric