engine case swap

[wayne billings]

Hello I have an unusual question. Is a swap of 94' engine case with '86 internals possible. I am hoping it is a direct swap. I do understand that the crank, balancer and final drive has to be delt with. are there any problems with the clutch, water pump ,transmission or heads. thanks for any insight or previous experience.

 

[Fire-medic]

AFAIK yes a swap is possible but the pick-up coils are different. 2 on the '86 & 1 on the '94. The generator rotor is different to account for that. Wire harness is different also. The gauges cluster may have a difference also. Do a site search for that information.

 

[maleko89]

Yes, will need to re-size your plane bearings for the crank, rods, and balancer. Probably check clearances of transmission shafts and middle gear too.

Mark

 

[wayne billings]

What is AFAIK ? Thank you for the info. Everything is going to go right back in the '86 frame, so i am thinking the electrics will be the same. Does that sound right? Thanks again for your time and expertise.

 

[maleko89]

As Far As I Know. That's fine. Cases are mated to the internals so if changing the cases, will need to re-do the plane bearings, etc. I don't think you need to worry about the final drive.

Mark

 

[wayne billings]

Maleko 89, thanks and tanks to fire medic

 

[wayne billings]

Another question , Is there a source for engine bearings that is more affordable than motosport or partsilla ? Thanks again for everyones help, this forum is worth more than we know. CHEERS

 

[Fire-medic]

In '96 the new style oil filter was introduced, which also required a change in the frame cross-brace between the 2 downtubes to having it curve in a semi-circle around the spin-on filter. Since yours is a '94, this is not an issue.

https://ia800204.us.archive.org/14/...ice-manual/yamahavmaxvmx12-service-manual.pdf

The factory manual will help you to select the proper clearance bearings.

 

[one2dmax]

Most parts will swap over without issue. You will need to refit bearings to match the bore specs of the new cases. There isn't much cheaper out there and no aftermarket options for bearings.

 

[gavicool]

Does the engine number can identify the number of pick up coils ? or you need to check the cabling coming out from the stator...

 

[Fire-medic]

Early '85-'89 engines use a 5 lead wire from the two pick-up coils, while the '90-'07 use 2 wires from the single pick-up coil. A search on here using my screen name and pick-up coil will get you pictures .

Here's the 5-wire one.

 

[gavicool]

Early '85-'89 engines use a 5 lead wire from the two pick-up coils, while the '90-'07 use 2 wires from the single pick-up coil. A search on here using my screen name and pick-up coil will get you pictures .

Here's the 5-wire one.

View attachment 95968

 

[gavicool]

So by the engine number(2EN-029157) is not possible to identify if it is coming with 5 lead wire or 2,isin´t it?
Thank you for your help Fire-medic.

 

[Fire-medic]

OK< tell us what is the year on your steering head decal. What market (Country) does it say the bike was made-for?

This list says, France. 1986, & 1988. DPS color=Deep Scarlet; ARE=Apple Red







Finally, a picture of the 2-lead 1990+ pick-up coil system electrical lead.



https://www.vmaxforum.net/threads/vmx12-factory-service-manual.52788/

Here's a list of yearly changes that could tell you what you have, or what has been switched over the years. Unfortunately the factory shop manual link isn't working today.