Margie 17 #1 Posted August 1 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 2,789 #2 Posted August 1 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 August 1 My 312-8 is a monster in the snow. 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 12,429 #4 Posted August 2 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 68,327 #5 Posted August 2 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 3,436 #6 Posted August 2 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 . 3 Share this post Link to post Share on other sites
peter lena 10,000 #7 Posted August 2 @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
Lee1977 7,744 #8 Posted August 5 I use Autolite 216 in my 12 HP Kohler engines The reason the on line belts don't work is the material on back side of the belt is not seal down. The Wheel Horse drive has a bracket on the clutch idler bracket that clamps the belt to stop it when the clutch is pushrd in. Deck belts need the seal down back side because the run on flat idlers on the back side. Share this post Link to post Share on other sites
Margie 17 #9 Posted August 5 10 minutes ago, Lee1977 said: I use Autolite 216 in my 12 HP Kohler engines The reason the on line belts don't work is the material on back side of the belt is not seal down. The Wheel Horse drive has a bracket on the clutch idler bracket that clamps the belt to stop it when the clutch is pushrd in. Deck belts need the seal down back side because the run on flat idlers on the back side. Awesome!! Thank you!! Share this post Link to post Share on other sites
sqrlgtr 3,669 #10 Posted August 5 (edited) A little late to the party but, I like the NGK B6L plug myself a close second is the Autolite 216. Hard to beat the tsc belts never had any trouble with them. Edited August 5 by sqrlgtr Share this post Link to post Share on other sites
