Mowett Mustang repower.

[katoranger]

No Chinese parts yet, but I am sure it will come.

The machine.



The engine donar.


3.75 briggs fits nicely.


Off to get some supplies.

[Weldangrind]

Now I get it.

I got two pics and two dreaded red X's, but then I can see your pics from the reply window. Odd.

I just received a Murray (Briggs) 6 horse vertical, and I have a Cadet 75 rear axle and a Foote transmission. I thought about a similar project, but I don't have time for it. Do you have a use for the rear axle and transmission? The input pinion gear is a bit worn (item 21), but it's otherwise in good shape.

[katoranger]

I don't need it, but I think that may be a popular one for mower racing.

Here is a video that shows the clutch setup.

[katoranger]

Looks like I need about a 1.5-2" pulley to fit on the engine. I need a new belt so I can play with pulley size alittle. Of course the bigger I go the faster it will go.

Will stick to a slower one though.

After I get the pulleys and belt setup we will take it apart for paint. Need a steering wheel and a seat too.

[Weldangrind]

Funny you should say that. I got the parts from an old refugee of the Fraser Valley Lawnmower Racing Association.

I was trying to build a tow vehicle for Son of Weldangrind's Jr. Drag Racing team at his middle school, but I ended up getting a complete Cadet 85 with electric start. I cut off the deck, re-geared the sprockets for more speed and added a free battery. I think the school still uses it, and that was three years ago.

I see that you have all the clutch parts you need.

[katoranger]

I am missing that rod that goes from the pedal to the idler pulley/clutch arm. The only other missing parts are the seat and steering wheel.

I spent about 30 minutes today taking it apart.






Next to to fix some of the bent pieces and start with degrease and sanding.

[Weldangrind]

I think there's a workaround for the clutch. I was nosing around Princess Auto today, and they have belt drive centrifugal clutches available in 3/4", 7/8" and 1" shaft size. They aren't cheap, but it would do away with the entire clutch assembly and make it into a semi-auto for you daughter. You could simply run a belt from the centrifugal clutch to the transmission,

[katoranger]

I was actually thinking about something like that. Will have to see if they have them at TSC.

It would make it much easier to operate for them.

[Weldangrind]

What size is the shaft on the engine?

[katoranger]

I am not sure. 5/8 or 3/4. I need to measure it. It is also pretty short. About 2" long.

$56 here
http://www.gokartsupply.com/clutches.htm

I only have about $30 in the whole project so far.

[Weldangrind]

$56.00 is fair. The prices I found go from there up to $100.00. What size is the Elite centrifugal clutch shaft? That might be your Chinese angle in this project.

[katoranger]

The elite uses a cvt and I think it would be difficult to setup. The belt clutch would be easily with just a belt tensioner.

I am watching a used one on ebay. I think this clutch would make it easier to drive. Also looking at a brake setup that will fit on the axle.

Then install two pedals.

[Weldangrind]

I'm not talking about the entire CVT, just the drive clutch portion. Would that shaft size happen to be the same? Why do you need a belt tensioner? Perhaps you could find the right size belt and then install the drive and driven pulley at the same time, just like timing gears on a car engine.

[katoranger]

The engine and transmission don't have any position adjustment. With the v-belt I would need to make sure the belt is resonably tight to keep it from slipping. I think the stock belt "clutch" could be used as a tensioner.

I did see one that had cogs on it.

The shaft on the honda is about 20mm. Too small.

[Weldangrind]

When engines are assembled for dyno testing, it's very common to just place a belt between the crank and water pump with no form of tensioner. The pulleys are placed on at the same time, rather than trying to pry the belt over the pulley.

That said, your idea of using the stock clutch setup as a tensioner is brilliant. :idea: