swap 125 force l drive with 150 ldrive?

[haven2500]

I just bought a 1990 maxum 125hp force ldrive. can you put a 150 powerhead in it?

 

[jerryjerry05]

Re: swap 125 force l drive with 150 ldrive?

Probably not.The exhaust systems are gonna be different(I think).J

 

[Frank Acampora]

Re: swap 125 force l drive with 150 ldrive?

I think the block will mount, because the mounting stud pattern is the same, but I don't know about the shaft splines and certainly it will stick up through the cover. The block itself is just so much more massive than the 125 there may be questions of room. The exhaust chest sticks out about three inches more. And then, you have an acknowledged reliability problem with the drive. Do you really want to invest the time, effort, and money into a rig that may crap out the first time you use it?

However: This is a really interesting swap. It is the kind of thing I would do, "Just to see." Let us know if you decide to try it and what problems you encountered. A word of advice: If you do decide to do it, Measure EVERYTHING at least three times BEFORE you start.

I will take some photos of the lower end of a 125 block and add them to this post so you can compare it to the bottom of the 150 block to see if there is compatibility.

Where are you located?

 

[92rslt1]

Re: swap 125 force l drive with 150 ldrive?

The splines on the mini shaft are going to be the determining factor. I'm guessing it will work. The L drives are actually 90hp or 120hp. you will need the 3 inch drive shaft from an L drive and simply slide it into the 150 crank.. if it fits its possible. There's a good amount of room in the engine compartment so that should be ok. If the splines dont fit and the motor does just simply get a used shaft from the original motor off ebay.. cut it to 3 inches and have it tig welded into the old shaft coupler and your all set. Simple machining and anythings possible. A 120 l drive does high 40s with a 19 pitch so I bet a 150 would be able to go a little steeper and it would fly.

 

[haven2500]

Re: swap 125 force l drive with 150 ldrive?

ThAnks guys. Im just wondering if the 21 foot maxum with a 125 force will be enough. And if not there mabe another option to make it alittle faster.

 

[Frank Acampora]

Re: swap 125 force l drive with 150 ldrive?

Depends upon your definition of "Enough." If you want to drag three slalom skiers, no, it will not be enough. Want to drag a tube? Sure. Decent turn of speed to get where you are going? Probably.

For me, "Too much horsepower is never enough."

If you do decide to try the swap, look for a late 150. It is big bore and has large dimeter TC carbs--much better at making the HP.

 

[92rslt1]

Re: swap 125 force l drive with 150 ldrive?

IMO they are real good until you load them with 8 people. The weight is where you start losing its efficiency.