21hp Twin Racing Mower | Pulley Swaps & Test Runs 

i have a 5 inch in the front and a 2 inch in the back and it will go 48mph

@@spudstudios3342 Nice, what size tires?

@@IngenTechNational 20-8-8

@@spudstudios3342 Alright!

Oh yeah definitely!

I was gonna mention something about it in this video but I couldn't because of storage and it wouldn't export.

Ah yes. Thats always fun. Theres always next video lol. Cant wait for it anyhow! Cheers!

Engine is a 4 inch, jackshaft currently has a 3.5 inch. Top of the jackshaft has a 8 inch and transaxle has a 3.25 inch.

@@IngenTechNational that's what I thought

I don't fully know exactly however, tires and steel was the most expensive pieces and all the little stuff all adds up fairly quickly too, but if I had to guess maybe 3-400 lol.

@@IngenTechNational Fairl cheap for all that fun though lol

Nice dude!

Haven't eventually done it but if I had to guess anywhere from 45-55mph or so! Hit 51 with the single cylinder OHV.

Yeah is still the original transaxle, never been inside of it and diff is still open. I did however change the fluid a couple of times.

Alright! The way it is currently is 4 inch on the engine, 3 1/2 on the jackshaft(bottom), 8 inch on the top of the jackshaft, and 3 inch on the transaxle. If I were to guess it is probably a 3 to 1 total ratio from the engine to the transaxle.

Yes, MST-206

Racing Mower is completely stock, changed the diff fluid accouple of times. Right now is 12oz of 75w90 and 4-6oz of 0w20 motor oil to help thin it out for the insane speed the shafts are spinning(10x faster than stock). The Off-road Mower has a welded diff and 18oz of 75w90 differential fluid. I have full diff oil in it because it is geared lower than the Racing Mower at only 21mph max, whereas the racing mower is geared for like 50-55mph.

@IngenTechNational I have a race mower I'm making I want it to go 35mph do you think it will be fine with the stock grease?. (i will not be going 35 constantly)

I don't know what type of transmission you have but mine is a Tecumseh Peerless MST-206 that is oil filled, if it is a very similar transmission with actual gears then if you are doing high speed, yes I would take the grease out because it is a semi-solid and doesn't work well for highspeed, you need some thinner oil to lubricate better and stay cooler. I would just fill it with some 75w90 or take the whole transmission apart to clean the grease(I guess you probably won't do that lmao cuz I wouldn't either) You can research your transmission online to find more information on what you can do.

The transmission possibly could be mounted backwards or upside down making it that way. If it is a F-N-R MTD with the vary-drive then maybe. I would have to look at in person to really know lol.

Its gotta have a key way in it, that would be pretty funny tho!

@@IngenTechNational alright I see thank you

18-9.5-8

@@IngenTechNational thank you

1000 I think

Okay I work on the exact same thing

Sort of yea, it isn't like a H pattern and a sequential it is just push it in a straight line in whatever gear.

@@IngenTechNational I did know you could do that without breaking gears . I always thought you had to be at a stop to shift to another gear . Thank You Joe

Yeah that is true bit it is fine on this I and many other people never had a problem, now when I shift into neutral or reverse then yes I stop lol.