[Build] Repower MDT with 6.5HP Clone - Snowblower Forum : Snow Blower Forums
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post #1 of 46 Old 11-22-2012, 09:50 PM Thread Starter
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Cool [Build] Repower MDT with 6.5HP Clone

SEND IN THE CLONES
This is the build thread for my MDT repower.. Gonna be updating this with pictures and such.

This is the old tired 5HP Techumseh with the dual output shafts ...boourns


This is the new 6.5HP Honda clone... its a 196cc Champion Engine



I know other people on the internet have done this repower and have always had problems dealing with moving both the auger and friction plate belts to a single shaft ... the auger works properly but the friction plate controls are backwards

To fix the backward-ness I am gonna flip the gearbox, axles and gear selector linkage
This is the stock configuration before the flip


Here is everything flipped


The friction plate engagement cable clears the drive gear(i may move it a little more to the right just for extra safety) and the only issue I can see right now is with the guide pin


The arm that slides the friction wheel along that shaft is bent in such a away that if i left it stock it would hit the wheel. My work around for this is to extend the pin which will allow the arm to clear the wheel. I figure i could use something like a longer strengthened bolt of steel pin so the arm clears.

Once I get the linkage figured out I will post pics of the engine mounting and the pulley reconfig



anyone see any issues with my idea ?
I think I have everything iron out
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post #2 of 46 Old 11-24-2012, 12:45 AM Thread Starter
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Got my engine mounted and pulleys have also been mounted
I took the belt tensioner out off the old engine but I wasn't able to keep it spring mounted ... so its more of an idleer pulley now



I had to longate the engine mounting holes to allow me to slide the engine as far forward as possible


One thing left todo is figureout how i am going to extend the output shaft ... see the gap inside the pulley, pulley is only sitting on about 1/3 of the shaft.

  • Stack of washers is to lift the gear selector arm up about 3/4 of an inch
  • Drilled new holes for the mounting bracket ... raise the mounting bracket up an inch
  • Drilled out the old pin and inserted a longer bolt



Notice the black lever arm at the very top, its done a 180 flip and now shifts on the other side, this allows me to KEEP all 5 forward speeds and 2 reverse
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post #3 of 46 Old 11-24-2012, 07:18 AM
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Looks like it's coming along nicely. Is there any possibility of finding another pulley with a deeper collar on it, as opposed to figuring out how to extend the power take off shaft?
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post #4 of 46 Old 11-24-2012, 10:04 AM Thread Starter
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Quote:
Originally Posted by bwdbrn1 View Post
Looks like it's coming along nicely. Is there any possibility of finding another pulley with a deeper collar on it, as opposed to figuring out how to extend the power take off shaft?


Well kind of I was thinking of this ... I could get a double groove pulley
Example partnumber 2BK30X3/4
2BK30 x 3/4" bore Two groove vbelt sheave pulley 3.15" outside diameter | eBay

and according to this
http://www.electricmotorwarehouse.com/pulley/cat28.pdf a 2BK30X3/4 gives me almost 2 inchs of collar
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post #5 of 46 Old 11-24-2012, 04:19 PM
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Hi Bain

Since I have the same machine you do just flip the lower auger drive pulley around and you are done. It moves the drive groove forward almost 3/4th of an inch and you do not need to extend the drive shaft. I found this allows me to get by without extending the shaft on my engine or getting a double drive pulley and there is still plenty of room for the lower pulley drive plate and its mechanism. How fast is your machine? I noticed you have a much larger drive pulley for the drive than I do. I noticed that my machine only has one usable speed for blowing now and 4 real fast ones. I have an 8 !/2 inch friction plate on its way so I will let everyone know how it works when I put it in.
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Last edited by GustoGuy; 11-24-2012 at 04:25 PM.
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post #6 of 46 Old 11-24-2012, 04:54 PM Thread Starter
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Quote:
Originally Posted by GustoGuy View Post
Hi Bain

Since I have the same machine you do just flip the lower auger drive pulley around and you are done. It moves the drive groove forward almost 3/4th of an inch and you do not need to extend the drive shaft. I found this allows me to get by without extending the shaft on my engine or getting a double drive pulley and there is still plenty of room for the lower pulley drive plate and its mechanism. How fast is your machine? I noticed you have a much larger drive pulley for the drive than I do. I noticed that my machine only has one usable speed for blowing now and 4 real fast ones. I have an 8 !/2 inch friction plate on its way so I will let everyone know how it works when I put it in.

I dont know how "fast" my machine is but according to other gocarting websites that use the same clone the govenor tops out at 3500-3600 rpm. I am deffinetly gonna check out that lower auger plate pulley. Btw my drive pulley is 3" if you increase your drive pulley size it would deffinetly slow down your machine.

Ill measure my friction plate ...let you know how wide it is. I like how we did the same swap but have gone about it in different ways
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post #7 of 46 Old 11-24-2012, 06:47 PM
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I have a 2 inch top drive pulley and mine was a bit too fast. The small shaft on the Tecumseh only rotates at half the rate of the larger shaft or about 1800rpm max so a smaller top pulley or a larger friction plate pulley is needed to slow down the drive speed of the machine.
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post #8 of 46 Old 11-24-2012, 07:50 PM Thread Starter
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Quote:
Originally Posted by GustoGuy View Post
Hi Bain

Since I have the same machine you do just flip the lower auger drive pulley around and you are done. It moves the drive groove forward almost 3/4th of an inch and you do not need to extend the drive shaft. I found this allows me to get by without extending the shaft on my engine or getting a double drive pulley and there is still plenty of room for the lower pulley drive plate and its mechanism. How fast is your machine? I noticed you have a much larger drive pulley for the drive than I do. I noticed that my machine only has one usable speed for blowing now and 4 real fast ones. I have an 8 !/2 inch friction plate on its way so I will let everyone know how it works when I put it in.
Flipping that lower pulley made all the difference ... I slid the upper auger pulley as far back as possible on the output shaft and now there is maybe just 1/4" of pulley not on the output shaft... which is AOK in my books.

Thanks for the tip

Now I just need to replace a couple cotter pins and the belly pans ready to go back on , that and I need to get a piece of tin to create a new belt/pulley cover.
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post #9 of 46 Old 11-25-2012, 01:01 AM
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Thanks Bain, Glad I could be some assistance with the lower auger pulley suggestion. I took mine all apart to paint it and when putting it together I noticed that I could simply flip the pulley the other way and then I could easily line up the engine pulley without having to extend the drive shaft on the engine I had mine all together and it's faster than I would like it to be and now I am just waiting for the larger lower friction plate and I will then see if it will slow it down to the point were I have a super slow 1st gear for deep snow and a a 2nd and 3rd gear with speeds that can be used for blowing my driveway, I never used 4th or 5th gear for blowing and they are only useful when walking it back to the shed in the back yard for summer storage.
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post #10 of 46 Old 11-25-2012, 11:45 AM
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Speed

Quote:
Originally Posted by GustoGuy View Post
I had mine all together and it's faster than I would like it to be and now I am just waiting for the larger lower friction plate and I will then see if it will slow it down to the point were I have a super slow 1st gear for deep snow and a a 2nd and 3rd gear with speeds that can be used for blowing my driveway, I never used 4th or 5th gear for blowing and they are only useful when walking it back to the shed in the back yard for summer storage.
I think you either need to use a smaller pulley on the engine or a larger pulley on the friction disc if you want to slow it down. I think if you just use a bigger friction disc it will speed up the drive rather than slow it down if my memory is correct.
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