Margie 17 #1 Posted 19 hours ago I just bought a 312-8 today! Already love it although I haven’t mowed yet. What is the best spark plug I can use (Champion RH-10C?) and the best transmission belt? I don’t mind spending a bit to get the best quality. Thanks in advance! 2 2 Share this post Link to post Share on other sites
ineedanother 2,634 #2 Posted 18 hours ago Excellent! We'll need pictures. We love pictures. The RH-10 is the correct plug and you can cross reference easily to other manufacturers. You'll have questions, everyone does but I have a 312-8 and it could very well be my favorite. Great machine! Here is a recent thread similar to what you'll be asking. 1 Share this post Link to post Share on other sites
leabassett@sbcglobal.net 174 #3 Posted 18 hours ago My 312-8 is a monster in the snow. 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 12,375 #4 Posted 14 hours ago 4 hours ago, Margie said: I just bought a 312-8 today! Already love it although I haven’t mowed yet. What is the best spark plug I can use (Champion RH-10C?) and the best transmission belt? I don’t mind spending a bit to get the best quality. Thanks in advance! Have a model number and serial number off the rear seat pan? Will link you to the appropriate manuals. Share this post Link to post Share on other sites
953 nut 67,545 #5 Posted 4 hours ago The TORO / Wheel Horse number for your 312-8 drive belt is 7473 which is a 82" X 5/8" V Belt. Many of us have used the Tractor Supply Kevlar belts with good results. Bew very cautious about buying belts on that are listed with TORO numbers, many of them are not the correct width and will not work. https://www.tractorsupply.com/tsc/product/huskee-v-belt-5-8-in-x-82-in-oc-4461826? 1 Share this post Link to post Share on other sites
clueless 3,428 #6 Posted 3 hours ago 49 minutes ago, 953 nut said: The TORO / Wheel Horse number for your 312-8 drive belt is 7473 which is a 82" X 5/8" V Belt. Many of us have used the Tractor Supply Kevlar belts with good results. Bew very cautious about buying belts on that are listed with TORO numbers, many of them are not the correct width and will not work. https://www.tractorsupply.com/tsc/product/huskee-v-belt-5-8-in-x-82-in-oc-4461826? If you can find one, their still out there, some members here sell them stay with an original Wheel Horse (Toro belts) their aren't cheap but there is a good chance the belts on your 35+ year old 312 are the original ones. Your drive belt (to the transmission) original belt number is 78-7100 it was later replaced by Toro 7473, it is 5/8" x81.9 anything you buy now are 5/8"x 82" does that 0.1" make a difference obviously it did the engineers who designed this things. The TSC huskee belt would be my aftermarket choice, they are about half the price of an original, so you can change it once and still come out ahead. Sorry, didn't mean to ramble on but I took my meds early today and I'm on my 3rd cup of coffee . 1 Share this post Link to post Share on other sites
peter lena 9,963 #7 Posted 1 hour ago @Margie agree with @953 nut on the T/S aramid belts , been bombproof for me , remember , what eats up a belt ? related , pulley in the set up , is incrementally hanging up / stopping , due to lubrication failure . while you are changing out the belt , take the time to feel / spin every related pulley / if possible , that will show the start / reason for noise / wear . thats your que , pete 1 Share this post Link to post Share on other sites
