changing vx225 midsection from 30inch to 20 inch

[roccochiodo]

Don't forget the shift shaft, the water pump tube, a new lower unit (or drive shaft as Rod notes) and goodness knows whatever else. You put in a new drive shaft and now you are dealing with a shimming and set up issue. Special tooling is usually needed.

A mid-section is more than just one part. It is an assembly made up of a number of detail parts.

Look at all of the parts that comprise a 20 inch upper casing. That is pretty much what you will need plus the other stuff that has been mentioned.

Also, look at the bracket assemblies. An L225TXR with a 25/30 inch mid-section uses a different power trim and tilt assembly than a 225TLR with a 20 inch mid-section uses.

Once you have totaled up all of the parts and all of the work required you might want to consider selling the wrong motor and buying the right motor. Unless you just like to mess with stuff. It will be an interesting and challenging project. Anything can be done, it is just a matter of time and money.

yea thanks I have changed a mid section from 30inch to 25 before but it had the same steering plate and knuckle set up.... im planning to get the whole midsection including everything like exhaust shiftshaft and that... but yea the trim and steering if different is going to be the problem.... with the lower unit im getting the shaft cut and resplined they don't remove the shaft from the gearcase there are plenty of places in auz that will do for around $100

[roccochiodo]

I don't know what shipping and taxes would be but usually places like Outboard Recycling or sunset marine sell complete mid sections for about 1000 dollars.
takes about 3 hours to change the drive shaft and shim the pinion.

if all your doing is changing the shaft the only special tooling nessasary is dissasemmbling the prop shaft bearing carrier.
on the 3.1L L case special tooling is a MUST.

as is a service manual.

myself I typically check the fwd gear lash BEFORE disassembling.
then simply shim the new shaft until the lash is back to the PRE RECORDED lash.
this keeps the wear pattern on the fwd gear and pinion in the same spot.

just remember on an L case the aft gear is the fwd gear.
occasionally they are reffered to as the front and rear gear.

hi thanks im getting my 30inch shaft cut down and resplined theres a lot of places that will do it for around $100 in auz and the shaft is not removed from gearcase at all...

[roccochiodo]

this is the midsection I have been looking at on ebay its a 3.1L 200 HP vmax midsection complete with shift shaft... http://i.ebayimg.com/t/Yamaha-VX-3-1...zv!~~60_12.JPG

[boscoe99]

Might I suggest a jack plate to elevate the motor that you have?

[roccochiodo]

I have thought about that.. I remember lifting the motor up with the engine crane to level that my perfectly heighted 20inch leg 140hp is tuned for outmost performance and that made the 225 stupidly high on the boat... it not only looked stupid but I dought the transome would take it very long at that height