What Size Pully?

I Was Wondering If Ya'll Know What Size Pulley's I Should Get I Am Thinking About 6" Pulley's ! I Don't Want Belt Slipage Problems! And I Want A Good Amount Of Torque. But Still Want The Mower To Run About 12MPH!

Is that the engine pulley? If so what size is on the transmission

I say 4-4 or 5-5 and beef up the clutch springs.

I would keep it 1:1 or as close to that as possible for now if you find it to fast or to slow then change one of them out I have found that 1:1 is the best ratio for starting out

Things to think about:

Go too small on any pulley, and slippage may prove to be a problem. Increasing belt tension to compensate, only stresses components out more. Speeding up the tranny input too much, can threaten the tranny. Consider "race prepping" your tranny if you're going to run it much faster than stock. Gearing is a matter of mathematics. Calculate the difference between old pulley sizes, and new pulley sizes to see how hard you're pushing it, and what sort of speed you can expect. Watch your clearances. Go too big on the engine pulley, and you might have interferences somewhere...

I was thinking 6" on the motor and 7" on the transaxle now actually! What do you think about that?

Seth Chester wrote:

I was thinking 6" on the motor and 7" on the transaxle now actually! What do you think about that?

A 7 should work on your transaxle but a 6 might not work on your engine check and make sure the clutch assembly is not in the way you may have to go smaller

Seth Chester wrote:

I was thinking 6" on the motor and 7" on the transaxle now actually! What do you think about that?

most mowers can easily have a 6" pully on the motor without interfering with the clutch, and a 6" to a 7" will still get your around 15 and also have small chance for a belt slipping

I agree with Richie the only mowers I really see that need the clutch modded is the ayp brands.

make a mock up of a pully using cardboard to test the clearance of everything. then just double up or beef up the clutch springs. there might be a little slippage, but if you get tighter clutch springs, you might be able to minimize it

richie thomas wrote:

Seth Chester wrote:

I was thinking 6" on the motor and 7" on the transaxle now actually! What do you think about that?

most mowers can easily have a 6" pully on the motor without interfering with the clutch, and a 6" to a 7" will still get your around 15 and also have small chance for a belt slipping

Yea, Thanks! Let Me Ask Again Do You Put The Smaller Pulley On The Motor Or Larger For More Torque?

Doc Sprocket wrote:

Things to think about:

Go too small on any pulley, and slippage may prove to be a problem. Increasing belt tension to compensate, only stresses components out more. Speeding up the tranny input too much, can threaten the tranny. Consider "race prepping" your tranny if you're going to run it much faster than stock. Gearing is a matter of mathematics. Calculate the difference between old pulley sizes, and new pulley sizes to see how hard you're pushing it, and what sort of speed you can expect. Watch your clearances. Go too big on the engine pulley, and you might have interferences somewhere...

What Size Do You Say Is Too Small? Thankyou.

willis923 wrote:

make a mock up of a pully using cardboard to test the clearance of everything. then just double up or beef up the clutch springs. there might be a little slippage, but if you get tighter clutch springs, you might be able to minimize it

Good Idea! I'll Go Ahead And Try That.

greener179 wrote:

I agree with Richie the only mowers I really see that need the clutch modded is the ayp brands.

Thanks, For The Advice.

redlinemotorsportts wrote:

I say 4-4 or 5-5 and beef up the clutch springs.  

I don't really know what you mean by "Beef up the clutch springs."

Seth Chester wrote:

redlinemotorsportts wrote:

I say 4-4 or 5-5 and beef up the clutch springs.  

I don't really know what you mean by "Beef up the clutch springs."

Put stronger ones in there. tractor supply sells some on isle ends. maybe make a mount and run two springs.

redlinemotorsportts wrote:

Seth Chester wrote:

redlinemotorsportts wrote:

I say 4-4 or 5-5 and beef up the clutch springs.  

I don't really know what you mean by "Beef up the clutch springs."

Put stronger ones in there. tractor supply sells some on isle ends. maybe make a mount and run two springs.

Ok, I'll go ahead and try that! Should I do that even with a 7" and a 6"

What tractor is this for, anyway?