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 MTD Trail Runner Build.

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Mississippi1313
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Ropertractor14
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PostSubject: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeFebruary 27th 2010, 2:47 pm

Pretty much going for a trail tractor. The original plan was to just put a motor on this beast, but that wouldn't be much fun would it? Hopefully it will be powered by a 6.5hp powerfist engine and a peerless differential.

MTD Trail Runner Build. DSCF1871
The tractor when I first received it.
MTD Trail Runner Build. DSCF1777
Tires and differential.
MTD Trail Runner Build. DSCF1779
Shafts need to be cut off and keyed shafts welded on.
MTD Trail Runner Build. CIMG0198
Shafts cut and welded on.
MTD Trail Runner Build. CIMG0199
Some goodies! Too bad I couldn't find centers for my pulleys.
MTD Trail Runner Build. CIMG0202
Still don't know what happened there.
MTD Trail Runner Build. CIMG0208
MTD Trail Runner Build. CIMG0209
Lots of stuff in there. Lots of potential weight savings when all that is removed.
Will have more updates soon.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeFebruary 27th 2010, 6:55 pm

Nice,can't wait to see it in action.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeFebruary 27th 2010, 7:44 pm

Cool- have y tried at tractor supply? They have all types of pulleys n sprockets along with weld in centers- im going to buy my gears there.

Im making a 'fun machine' ( call it a go kart) out of my MTD wizard- itll be lowered, straight rear axle and use a 5HP horizontal OHV honda motor i got free- itll stay like that till i find a huge horizontal twin cylender motor.....
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeFebruary 28th 2010, 6:13 am

That thing should be cool. People underestimate small HP engines. 6hp is plenty to move you along pretty nicely!

As for that engine bay picture, I really dont know what could have happened there! Pretty weird. Someone must have vhad problems with a pulley or something!



Dont get me started on pulleys. In the UK there seems to be no demand for them, so there are literally no pullies anywhere. Only ones I can find from machinemart are aluminium ones. And all the bore's are metric sizes. I'm going to have to modify the stock pullies for my mudder. 6.5 upfront, 5.5 in the rear, shouold give me lots of belt grip.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeFebruary 28th 2010, 8:48 am

Chunk wrote:
As for that engine bay picture, I really dont know what could have happened there! Pretty weird. Someone must have vhad problems with a pulley or something!

Look like it was a stuck pulley to me too!

That a really nice rig youve got there! lots of potental! I want some of those goodies too! Don't put too big of a sproket on the rearend, it'll be the first thing to bottom out. Are you keeping the diff unlocked? If you wanted it locked, just use a 1 piece axleshaft, that would never break.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeFebruary 28th 2010, 10:21 am

I bought my bearings, pulleys, and sprockets from princess auto, the only problem is they were all out or never had the proper centers for my pulleys.

Currently the plan is to keep it unlocked, but if I need more traction I should be pretty to slide a solid axle through and throw a different center on my sprocket.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeFebruary 28th 2010, 12:55 pm

Chunk: Do you have any electrical supply shops around? If they carry electric motors, they should carry pulleys.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeFebruary 28th 2010, 3:01 pm

Managed to get it basically down to a bare frame today.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 2nd 2010, 11:45 am

Cant wait to see more. This looks like its gonna be a real nice build!
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 4th 2010, 3:14 pm

MTD Trail Runner Build. CIMG0216
Brought it inside today and started mounting the engine.
MTD Trail Runner Build. CIMG0221
I had to make spacers so the engine shroud will clear the frame bolts.
MTD Trail Runner Build. CIMG0223
Engine sitting on the tractor.
MTD Trail Runner Build. CIMG0229
I will build a custom exhaust since the stock muffler will dump straight at the plastic dashboard.
MTD Trail Runner Build. CIMG0231
Motor spacer.
MTD Trail Runner Build. CIMG0234
Another view of my motor mount setup.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 4th 2010, 5:34 pm

It's looking nice! Are those tiny front wheels staying on it? Shocked

Wow, a brand new motor, sweet! You got the whole cut in the chassis for the chain yet?
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 4th 2010, 6:17 pm

Chunk wrote:
It's looking nice! Are those tiny front wheels staying on it? Shocked

Wow, a brand new motor, sweet! You got the whole cut in the chassis for the chain yet?

I will be putting the stock wheels back on once I get tubes.

Also I plan on running a belt back to a jackshaft and then chain down to the axle. So I really won't need to cut the frame.
MTD Trail Runner Build. CIMG0237
Thats a rough idea of what my belt drive will look like. I pulled the idler pulley off a tiller.
MTD Trail Runner Build. CIMG0238
I should have plenty of clearance to run my belt inside the frame to keep it out of the elements.
MTD Trail Runner Build. CIMG0241
Thats how my jack shaft will be set up. I plan on going to get centers for my pulleys this weekend.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 4th 2010, 6:38 pm

Looks nice! New parts are sweet. Is the a robin subaru engine? It look identical to the on we have on our plate compactor at work.

What are you doing for a clutch? Is it that pulley in the first pic of your last post?
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 4th 2010, 6:47 pm

The engine is made by Launtop. The clutch will just be a tensioner style setup with a 4" pulley on the motor and 8" on the jack shaft.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 4th 2010, 7:17 pm

Cool setup- i was going to do something similar on the wizard- im using a go kart clutch on the motor and chain drive to the axle - its a small tractor - i dunno , might need to do a jackshaft if the chain gets too long- since the tractor was free and was missing alot of parts- im not worried about hacking holes in it.

Ill probably need a couple sprocket idlers , and have seen plastic pulleys used for chain tensioners. This is getting a near full mod setup as well, eventually id like to find a monster twin horizontal shaft motor....
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 5th 2010, 1:37 pm

Flat nylon pulleys work well on chains, they dont wear out too fast, and theyre pretty cheap.

Never heard of Launtop, Im guessing it's a chinese copy of some small engine though. That belt tensioner should work well, the more simple the better in my opinion!
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 7th 2010, 10:32 am

Well this morning I started drilling the 1/2" holes for my rear axle bearings. I managed to drill the first set pretty much dead on. The second set I didn't get so lucky. Since it's hard to find the center of a hole after it's drilled I was forced to guess, since I was making a copy of the first one and caused the holes to be about 3/16" off. But I had a plan, rather than drill a new piece I tried to use a burr to elongate my holes so they line up somewhat. So now I only have about an 1/8" inch to go. I will have to see how it turns out.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 7th 2010, 12:19 pm

That sucks, I know exactly what it's like. Sometimes you just have to accept that something wont work though, like my pulley. It's all good to learn from though, so it's not always bad.

Cant wait to see more
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 7th 2010, 4:31 pm

I will need to make a trip to princess auto before I can do anymore. Yesterday I was in and bought a solid axle and my pulley centers. Today when I mounted my pillow block's on the axle I noticed that it's bent.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 7th 2010, 5:18 pm

Sounds about right! Nothing is ever simple. No
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 7th 2010, 5:22 pm

Chunk wrote:
Sounds about right! Nothing is ever simple. No

Always something gone wrong.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 7th 2010, 6:31 pm

if your gonna run big tires and a lot of power, I would put 3 bearings on that jack-shaft, that's gonna be a huge stress point. I hate when stuff doesn't work out. Espicaly when I have have to spend money because of my mistake.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 7th 2010, 10:45 pm

thats how i felt about when that trans pinion gear popped out- nothing ever easy when y want it to be.....
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 15th 2010, 7:58 pm

Finally have another update.

MTD Trail Runner Build. CIMG0246
Got my tensioner welded in. Now I need to find a spring.
MTD Trail Runner Build. CIMG0248
MTD Trail Runner Build. CIMG0253
Jackshaft,belt and chain have been installed.
MTD Trail Runner Build. CIMG0254
Slot to accommodate my large rear sprocket.
MTD Trail Runner Build. CIMG0255
Do I put a tensioner on the bottom top side of the chain?
MTD Trail Runner Build. CIMG0265
View from down under.
MTD Trail Runner Build. CIMG0256
View from the top.
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PostSubject: Re: MTD Trail Runner Build.   MTD Trail Runner Build. Icon_minitimeMarch 15th 2010, 8:46 pm

Very cool- comming along nice! Most racers that do setups like that offset the drive sprocket to make room for the brakes on the opposite side. I like how y used the belt from the motor- then y dont need a go kart clutch.
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