Ahh...projects. We have too many of them sometimes!
My lastest...a Wizard riding lawn mower. 12 HP briggs & scrap-iron engine, 38" cutting deck. It was a freebie..and ran/mowed ok when it was given to me.
Anyway, when I got it the engine ran really rich. I cleaned the carb numerous times, put a kit in it, checked the flywheel key...etc...everything I knew to do (I work on John Deere mowers for a living) and still couldn't get it to run right. Anyway, it ran out of gas while playing with it, so I went & got the gas can. Started pouring, and my father had filled that can with methanol for the race car. Well, poo..might as well try it right? Guess what...ran great on alky! Gave me ideas....
So, now that she's running great, the idea came to me. Wonder if changing the pulleys would do anything? It comes stock with a 2" pulley on the engine and a 11" pulley on the transaxle (peerless transaxle...4 speed). I bought a pair of weld-a-pullies and the right mandrels for the crank & trans. The crank pulley went to a 9" dia pulley, and the transaxle went to a 1 1/2" pulley. Sounds easy right? Not exactly...had to get a longer belt, redesign the clutch linkage, and add a few belt guides. Only thing I re-used was part of the clutch linkage, a spring, and the pedal.
A friend of mine asked if he could drive it. I wasn't man enough to shift it to 4th gear...even at idle it was going about 15 mph and almost killing the engine.
So, I put a little home-made caster into the front axle to help stabilize it, put a hydraulic rear disc brake inside the right rear wheel, and welded the spider gears to make it a live axle...actually I call it a Hobart locker (I made it with a Hobart 180 amp mig). I also put a foot-activated governor override on it.
Friend drove it down the drag strip and went 46 mph on it. That was at 5200 RPM in 4th.
Best part: In first gear, wide open (witout touching the foot feed) we still use it to mow. It's just like having a regular ol lawn tractor...except it will go a little faster.
"it is better to appear ignorant than to open your mouth and remove all doubt"--Mark Twain
<font size=-1>[ This Message was edited by: mavman on 5/19/06 11:21am ]</font>