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Repowered MF12


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#1 tractor tinkerer 2 OFFLINE  

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Posted August 05, 2010 - 11:36 AM

I am in the process of repowering a MF12G with a 13hp Honda GX390 knock off.
Has anyone done this as well? I have positioned it to engage the PTO pulley correctly but in doing so, the Park postion does not work well anymore. I think that the drive
belt may be too tight now. Does anyone know what size increments the belts come in?
If I can get a belt just a little longer I think the problem will be solved.

Thanks!

#2 DH1 OFFLINE  

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Posted August 05, 2010 - 08:31 PM

I did 2, both with a Hydro tractor worked good, fit OK but the charging circuit not strong enough to run the lights.
Need to modify exhaust and control cables.

Attached Thumbnails

  • masseys 024.jpg
  • muffler 004.jpg
  • muffler 001.jpg
  • mf12 001.jpg
  • mf12 004.jpg


#3 poncho62 OFFLINE  

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Posted August 05, 2010 - 09:16 PM

I am pretty positive taht you are not going to find a longer belt......the MF belts have a certain angle to the sides and I bet they only come in that length......Easier to move the engine a bit.

#4 DH1 OFFLINE  

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Posted August 05, 2010 - 09:27 PM

:ditto:


Also original crank is 1 1/8" dia. Honda clones are 1"
Don't know how your going to mount the original pulley, the Vari drive belt is wide.
For me the Hydro is a standard belt I bought new pulleys same outside dia. as original for a 1" crank, and used original belt.

#5 tractor tinkerer 2 OFFLINE  

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Posted August 06, 2010 - 07:12 AM

I see you mounted the engine a little more to the right side.
How did you manage the choke?

I will some images in the gallery of what I did.

Thanks!

#6 DH1 OFFLINE  

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Posted August 06, 2010 - 07:24 PM

The honda clone I used the same mounting holes as the HH120 did.
For the choke I drilled a small hole in the choke lever on the engine and fabed up a bracket to hold the outside cable, did it 2 different ways, 1 the cable goes around the left side using the original choke control, the other, the cable goes around the right side using a push pull type control.

Added
I just looked at your pics. and saw how you did yours, you must of shimmed or used a bushing in the crank for the pulley.
When I did mine I mounted the engine in the same mounting holes and tried to make everything fit without cutting up the hood or grill, ended up cutting small notch for the exhaust.
Removed the air cleaner cover, used the gas tank that came with the engine and modified the exhaust to mount the muffler on the outside, cut the manifold pipe and welded in an iron pipe 90.
PTO pulley I used is a bit larger so I used a longer belt to make it work, one has a double pulley, the shiny tractor has 2 separate pulleys, that one the PTO pulley is almost the same dia. and the PTO pulleys line up better.

Edited by DH1, August 06, 2010 - 07:54 PM.
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#7 Stormyhusky OFFLINE  

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Posted August 18, 2010 - 09:31 PM

I did somethig similar with a 16hp v twin Briggs motor. Still have a few things to finish up. This was a great find wth seized up original HH12 Tecumseh.. Free to boot!

#8 mjodrey OFFLINE  

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Posted August 19, 2010 - 04:33 AM

Stormyhusky:welcometogttalk:glad to have you here.




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