I have a 1993 Suzuki LT230E that Ive decided to turn into a fishing quad. I have a 72v 3000w "rated speed 4900rpm, max 6500rpm" electric motor that will be powered with a 72v 30AH and I have it almost complete but I need to change up the sprocket to a thicker more robust one. As of right now it's a T8F-11 with a T8F-54 tooth chain. Not going to cut it. Any recommendations would help. Mounting will be on sway bar just above the back. "Yes I know I'll need a couple chain tensioners." 
No answers, but very cool project!
I would try to get it to a 420 chain. Most of my little atv's and toys use 41/42/420 chain. Lots of gearing options and plenty strong enough.
How fast do you want to go? (actual serious question)
1) Looks like it's easy to find 'double-D' sprockets for the MY1020 motor in both #35 and #40/41/420
2) Are you planning to use a jackshaft plus the ATV's original sprockets and chain?
Definitely double check my math for reduction ratio. I didn't do any real numbers at all for chain strength, just TLAR (That Looks About Right).
As long as it gets enough amps, the motor should be able to produce its max torque (~6Nm or 4.4lb-ft) up to 4900RPM . Torque then drops off above that RPM, down to effectively zero at the max no-load 6500RPM.
If you have 22" tall tires and want to go 20mph at 4900RPM, you need 16:1 reduction which pretty much has to be two stages for chain drive. (link to one of many speed-RPM-ratio calculators out there)
Using the ATV's original sprockets, looks like those would have been 11 or 12T front plus 40 or 41T rear, or 3.73:1 in the best case from jackshaft to axle. IDK exactly how you attach the original 11T sprocket to a jackshaft, but that's just a minor detail... or mess with narrowing a #50 keyed sprocket for 520 chain or use 530 chain or whatever.
16/ 3.73 = 4.32 reduction between motor and jackshaft, which is more or less 9T/39T or 10T/43T or 11T/48T (all look pretty easy to find in either #35 or #4xx, even on Amazon)
random poached chain size chart
In reply to Oconnortatzz :
Wiring mostly figured out, battery will be here next week, time to take apart and prep frame for paint. Front suspension can be prepped and painted, rims and hubs also. Not going to paint rear sway bar until motor mount is complete.
In reply to Oapfu :
Found this online and would like to mount the motor like this. would love to keep the original sprocket size but if I can find a new one I'm open to that. I am not to concerned about speed I would just rather have efficiency and longevity lol. If that has some speed them I'm good.
Looking like I may have to get a custom made sprocket. I have found many 35- 420- 428 sprockets for the electric motor but the bolt pattern in those for the LT230 rear is like a yellow and white zebra, rare and I don't believe it exists. Going to try some more and bring one to a shop and maybe see if they can look on their computer but may have to send it out to get made.
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