carlosking450 155 #1 Posted April 22, 2022 Hello friends, I have a Wheel Horse 702, it goes very well, but since I don't use it for work I would like to gain a little speed, do you know what modifications can be made to gain speed? 1 Share this post Link to post Share on other sites
Pullstart 62,905 #2 Posted April 22, 2022 Hello Carlos, a smaller rear pulley and possibly a shorter 4L series belt should do the trick. Pi*D=C. The % difference in Circumference will be the % of speed increase. 2 Share this post Link to post Share on other sites
Pullstart 62,905 #3 Posted April 22, 2022 @Racinbob and @WHX?? have made this modification to similar tractors. They might have increased the front pulley size also? Share this post Link to post Share on other sites
Snoopy11 5,714 #4 Posted April 22, 2022 Kevin said it. Except, you can put a bigger pulley on the engine. Bigger pulley on the engine... faster speed. Smaller pulley on the transmission... faster speed. You don't want to go too small... or the belt will slip. On my 800 Special, I have an 8 inch pulley on the engine, 4 inch on the transmission pulley. It is LUDICROUSLY fast. On my L-157, I have a 5 inch pulley on the engine, 2.5 inch pulley on the transmission pulley. It is fast enough for traveling in high gear, slow enough for work in low gears... Don 1 Share this post Link to post Share on other sites
Snoopy11 5,714 #5 Posted April 22, 2022 Other things to keep in mind... you will need to feather the clutch more so as not to stall the engine. And... in most cases you will need to make your own belt stops, whether you go bigger on the engine, or smaller on the transmission. As well, if you go REALLY small on the transmission, you may need 1 or 2 idler pulleys to keep the belt tensioned properly. Don 1 Share this post Link to post Share on other sites
carlosking450 155 #6 Posted April 22, 2022 Thank you very much for answering so quickly, are these pulleys that you mention sold or do they have to be made using a lathe? 1 Share this post Link to post Share on other sites
Snoopy11 5,714 #7 Posted April 22, 2022 (edited) 17 minutes ago, carlosking450 said: are these pulleys that you mention sold Absolutely, yes, they are sold. I'm not sure where exactly you can buy them in Madrid... perhaps some tractor shop or lawn-mower shop there? Should be a 3/4 bore pulley for the transmission and I believe 3/4 bore pulley on the engine as well. Don Edited April 22, 2022 by Snoopy11 Share this post Link to post Share on other sites
carlosking450 155 #8 Posted April 22, 2022 Many thanks friends It is lucky to be so far away and that you respond so quickly to my doubts! 1 4 Share this post Link to post Share on other sites
Snoopy11 5,714 #9 Posted April 22, 2022 1 minute ago, carlosking450 said: Many thanks friends It is lucky to be so far away and that you respond so quickly to my doubts! Absolutely! You let us know if you have any more questions. There isn't anything that we won't help with... this is... after all the best tractor, mechanical, and performance forum on the internet... Regards, Don 2 1 Share this post Link to post Share on other sites
Pullstart 62,905 #10 Posted April 22, 2022 The engine shaft is more likely to be 1”. If you up the engine pulley size too much, you’ll be into belt guard modifications, etc. Reducing the rear pulley size and belt length accordingly, it can easily be put back to stock. 3 Share this post Link to post Share on other sites
Snoopy11 5,714 #11 Posted April 22, 2022 1 minute ago, Pullstart said: The engine shaft is more likely to be 1” Oh, yeah, I guess it depends on what engine we are talking about... I shoulda' thought of that... Indeed, come to think of it... the engine shaft on my L-157 is 1 inch... The shaft on my 800 Special is 3/4... Why do I feel like a discussion of shaft sizes... is not... appropriate... @Jeff-C175 @ebinmaine @Pullstart... Don 1 4 Share this post Link to post Share on other sites
davem1111 2,030 #12 Posted April 22, 2022 2 minutes ago, Snoopy11 said: Why do I feel like a discussion of shaft sizes... is not... appropriate... @Jeff-C175 @ebinmaine @Pullstart... Size DOES matter... 1 1 Share this post Link to post Share on other sites
Snoopy11 5,714 #13 Posted April 22, 2022 20 minutes ago, Pullstart said: If you up the engine pulley size too much, you’ll be into belt guard modifications That is precisely right. I had to make my own belt stop/guard thingies on both of mine... Don Share this post Link to post Share on other sites
Achto 27,601 #14 Posted April 22, 2022 A 1 inch larger diameter pulley on the engine and a 1 inch smaller diameter pulley on the transmission will increase the speed and most times you can get away with the same belt that you had. This is what @WHX?? did with Cindaaaay's 702. 1 Share this post Link to post Share on other sites
SylvanLakeWH 25,598 #15 Posted April 22, 2022 2 hours ago, Snoopy11 said: Why do I feel like a discussion of shaft sizes... is not... appropriate... @Jeff-C175 @ebinmaine @Pullstart... 2 hours ago, davem1111 said: Size DOES matter... Again with the visuals!!! 2 Share this post Link to post Share on other sites
rjg854 11,378 #16 Posted April 22, 2022 1 hour ago, Achto said: A 1 inch larger diameter pulley on the engine and a 1 inch smaller diameter pulley on the transmission will increase the speed and most times you can get away with the same belt that you had. @WHX?? I did that on my 854 and the belt guard work the same with no alteration. 1 2 Share this post Link to post Share on other sites
Racinbob 11,088 #17 Posted April 22, 2022 4 hours ago, Pullstart said: @Racinbob and @WHX?? have made this modification to similar tractors. They might have increased the front pulley size also? Yes, I experimented with both. I found that a larger engine pulley worked the best. I didn't want a race tractor but it was fast enough to get the grandkids attention when I got it on the road and could go that speed. Just some minor bending was all that was needed on the belt guard. It's been reverted back to stock now that I have dedicated that tractor to a sickle bar mower. 1 Share this post Link to post Share on other sites
953 nut 55,298 #18 Posted April 22, 2022 Any industrial supply stoer that sells belts an pullies should be able to neet your needs. A solid steel pulley is much better tha aluminum. 3 1 Share this post Link to post Share on other sites
Maxwell-8 4,277 #19 Posted April 23, 2022 15 hours ago, 953 nut said: Any industrial supply store that sells belts an pullies should be able to meet your needs. A solid steel pulley is much better than aluminum. not so much in Europe ... I found some online mainly the ones on the tranny, but most of mine are custom made. I recommend a 1:1 ratio or max a 5 inch in the front and a 4" on the tranny. Otherwise you will have a hard time starting in 3rd. no tanto en Europa ... He encontrado algunos en línea, principalmente los de la trannsmisión, pero la mayoría de los míos son hechos a medida. Recomiendo una relación 1:1 o como máximo una de 5 pulgadas en la parte delantera y una de 4" en la transmisión. De lo contrario te costará arrancar en 3ª. 1 Share this post Link to post Share on other sites
Pullstart 62,905 #20 Posted April 23, 2022 3 hours ago, Maxwell-8 said: not so much in Europe ... I found some online mainly the ones on the tranny, but most of mine are custom made. I recommend a 1:1 ratio or max a 5 inch in the front and a 4" on the tranny. Otherwise you will have a hard time starting in 3rd. no tanto en Europa ... He encontrado algunos en línea, principalmente los de la trannsmisión, pero la mayoría de los míos son hechos a medida. Recomiendo una relación 1:1 o como máximo una de 5 pulgadas en la parte delantera y una de 4" en la transmisión. De lo contrario te costará arrancar en 3ª. Just remember, a 5” engine pulley will surely require belt guard modifications. Share this post Link to post Share on other sites
Tractorhead 9,064 #21 Posted April 24, 2022 I used a inch bigger on the Front ( Engine side) Therefore i must rework a little bit the Beltcover but not too much. I cutted the original cover and bend it up, inserted a long triangle Steelchop welded it on and repaint it. Can also be used with the Stock pulley. Share this post Link to post Share on other sites
