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Discussion Starter · #1 ·
I got a deal on a GX390 clone and am thinking of putting it on one of my 990's
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Its a 13 hp, with recoil start.

This is the plan:

Take off the recoil and make an adapter to mount a pulley for the starter/generator.

Make necessary brackets to mount the starter/generator.

Make an adapter plate to raise the engine to the correct crank height, as well as bolt to the stock Briggs location on the frame.

Make a plate for the PTO side of the engine that replicates the PTO side of the Briggs block so I can reuse all of the original MTD PTO Bracketry.

I have a parts tractor(990) I just picked up that I may try to use for this.
The parts tracor needs:

Engine
Hood
Grill
Front Axle
Spindles
Lift Cylinder
Lift Valve
Wiring
+more

I do have a Cub Cadet 125 grill shell and can make a hood, just like the pics ABC posted.

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I could go another route with this and just run the engine without the starter/generator. Here are the benefits to this option.

No wiring
No starter/generator brackets
No battery to replace
No gauges
No frills

I could go either way, I am just pleased to have a new engine on the way!
Every tractor I have ever had (8 or 9 now) has had Old Engine Syndrome, some smoke, some start hard, some leak, some die unexpectedly and it gets a little old after a while.

Help me choose a direction fellas

Thanks

Scott
 

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236 Posts
Discussion Starter · #2 · (Edited)
The clone engine is rated at 19.5 ftlbs of torque at 2500 Rpm.
Its dispacement is 23.7 Cubic inch, with 3/4" less stroke than the Briggs.

The 16 Hp briggs is 32.4 Cubic inch and I don't Know the torque.

In the 70's, how did Briggs measure HP/TQ, SAE, NET, BRAKE?
Is it measured the same standards today?

Briggs, .493 HP/CI
Clone, .548 HP/CI

Scott
 

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sounds like you are starting off with less than me. I dd find the hood, grill and front axle. still need the wheel spindles. and seat but I dont think the seat will be a challange. actually, mine is the one that ABC had the other hood mounted on. I found a farm king hood and grill.
 

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Discussion Starter · #4 ·
Yeah there isnt much left of it.
I really like those Columbia grills, but I have a Cub grill and I need to be frugal on this tractor.
This ones name is Junkyard Jewel and I will be using what I have around to build it.
$400 is the current budget for this thing.

I have $270 into it including the new engine.

Scott
 

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Discussion Starter · #5 · (Edited)
Here are some pics of Junkyard Jewel, pretty humble beginnings for sure.
This thing has been beat like a rented mule in its past life.
Some of the repairs I found really boggle the mind, so here are some of the highlights;
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Also, you will notice the front frame ears are whacked off, the front axle appears to be of the JD variety and the hydraulic lift shaft/arms have been whacked out as well. This thing had a loader on it, so I would imagine that all the carnage went on during the "conversion" to a loader tractor.

Enjoy
 

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Discussion Starter · #6 ·
You'll notice in this picture that the right hand axle seal leaked very bad.
I drained the fluid out of the transaxle and though it looked clean, there was some considerably sized iron on the magnet of the drain plug, which scares me a little.
Have any of you guys found "Iron" chunks on your drain plugs?
Have any of you ever put axle seals in one of these rearends?

Scott
 

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