[NMKawierider]

RedRider, just measure the slot width and length from below the circlip groove to the end of the keyway slot. As I recall the key is just slightly shorter then that...like .5mm shorter. Close enough.

Width and length is easy enough but depth is much harder to measure. I imagine they are not all the same depth but I don't know. I really just wanted one in by this weekend, but not sure if that is going to happen with alpha now.. Why pay them an extra $10 for shipping 2-3 day when they don't have the parts in stock anyway?  That kinda pissed me off.

Keys are square so they are the same all the way around. The width of the keyway will give you all you need.

[REDRIDER]

I guess I could just take the whole thing to the lawnmower place and see if we can match one up.  If I do this and find a good one I'll be sure to post the part # and what not so we can get them and not wait 2 weeks from a dealer...

[NMKawierider]

They are square...same on all sides.

[Cosmosdan]

Some keys are rectangular but I remember mine was square. There will be clearance for the key height. The slots are cut a tad deep.

[REDRIDER]

Funny story.  So i took the clutch sheaves apart to take the helix and shaft to match up a keyway.... found the keyway inside the shaft suck there against the threaded rod i was using for the compression tool.... so i cancelled my alpha sports order. I Marrs l measured the keyway. It is .249 square and 1 inch long for future reference.  So 1/4 inch key stock. 

[NMKawierider]

Glad you found it. It will be a metric number...somewhere between 6mm and 8mm I'm guessing.

[REDRIDER]

.249 inches comes to 6.325mm 

[NMKawierider]

Odd number for a Key but ...it is Chinese 

[REDRIDER]

Well i can find keyway for 1/4 which are slightly under 1/4 it says (doesn't say by how much)  but i can find nothing for 6.325. I'm asking what they actually measure at out of the box. 

[NMKawierider]

Well i can find keyway for 1/4 which are slightly under 1/4 it says (doesn't say by how much)  but i can find nothing for 6.325. I'm asking what they actually measure at out of the box. 

I don't know but you know..it can't be anything but metric sizes. I would have thought something like 6mm for the key and the slot has to be a hair larger...like 6.035 or something like that. Oh well, at least you found it. Now you can get to having some fun.

[REDRIDER]

Yes,  well i have sliders and tires in the mail so I'll wait until i get the sliders to put it back together anyway buy hopefully they are here by Thursday! 

[NMKawierider]

Yes,  well i have sliders and tires in the mail so I'll wait until i get the sliders to put it back together anyway buy hopefully they are here by Thursday! 

You'll be amazed! 

[Cosmosdan]

Remember that the clutch was made in Canada. They use the metric system. Maybe one of there designers is a hold out.

Keep in mind that if you use a caliper it can be off .001 or more depending on where in the jaw you measured. A caliper with a gap of .0015 at the tips will still pass calibration and is fit for use. Closer than +- .003 a caliper should not be fully trusted.

[REDRIDER]

I measured in a few places in the jaw, got .249 to .2485. Pretty sure a 1/4 keyway would be right on. If i ever need one I'll get a 1/4 one and find out for $3 down the street rather than order one and wait

[NMKawierider]

Remember that the clutch was made in Canada. They use the metric system. Maybe one of there designers is a hold out.

Keep in mind that if you use a caliper it can be off .001 or more depending on where in the jaw you measured. A caliper with a gap of .0015 at the tips will still pass calibration and is fit for use. Closer than +- .003 a caliper should not be fully trusted.

Oh yeah..forgot..CVTech...still..should be metric. Maybe not...