Ezgo 1000 cc build

Aburdett

Just joined after doing some googling and finding this site. I have picked up an ezgo I believe it's a 93 medalist? And a 01 gsxr 1000 engine. So the fun will begin. I'm on the fence of doing a solid axle with pillow block bearings and mounting a caliber and sprocket on that or keeping stock diff for now. Just looking for a fun toy around the yard, field and gravel road to friends. It won't be hittin the hwy adoring any crazy 100 mph runs.

I've seen some kits online of drift axles that have bearings and all. 1 or 1.25" shafts. Which I would think would be large enough. Feel free to give any suggestions. I was thinking just run stock diff till it won't hold the power....not sure about maybe stretching the rear a bit if I went with a shaft.

By my calculations my gsxr sprocket ratio would have to be in the 1:1 - 1.3:1 range otherwise it'll be slow.....I tried spinning tire and counting clutch turns to 1 tire turn. Something don't seem right in diff so first thing will be opening it up.

Maybe I'm wasting my time.

Look forward to learning more.


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BGW

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Aburdett

So I spun the tire and seemed to take 7 clutch revolutions per tire revolution. If that makes sense. Giving me a 7:1. Have found no info showing the stock ratio should be like that in the diff though.
One rear hub has no splines.


Splines on axle look to be ok. Other hub is fine.



Can't post pics yet need to be a member for longer.

So if let's say I rev at 11500 rpm in 6th top speed and I want 60mph.

On 18" tires it would be 18"x3.1415926 = 56.549" per revolution. 63360" in a mile divided by 56.549 = 1120.44 rev per mile.
So at 60 mph I need 1120 rpm from the tire. At 7:1 I'd need 7843 rpm at clutch to get 60mph on 18" rubber.

6th gear ratio is 1.208 on gsxr 1000. So with engine rpm of 11500/1.208= 9519.86 rpm at trans sprocket. Stock sprocket of 17 and smallest sprocket of 30 I've found online nets me a 1.764:1 ratio. So 9519.86/1.764 = 5409 rpm netting me a 41.37 mph.... please let me know if my math is wrong.

9519.86 / 7843 = 1.2:1 ratio is roughly what I would need between my sprockets to achieve 60 mph.

scottyb

The cart has a 12.44:1 gear ratio unless modified.

I have a 720cc twin in my workhorse - it's plenty of power but all of these equipment engines run about 3-4000 rpm, so that's going to limit speed.

Aburdett

So should I not get 12.44 turns on the clutch? I'd be surprised if someone has changed from stock. Up here in Canada it doesn't seem like many are doing this as well the cart doesn't appear to have any other mods.

It's also a marathon not a medalist. My bad on that one.

rib33024

You have to spin both tires forward at the same time, to get the correct ratio. You can't just spin one tire and get a true reading

Aburdett

K I'll do that

Aburdett

Ok so it looks like it took just over 12 so ya prob the 12.44 like mentioned. Well that makes it much worse to try and get speed. I'd need a 13932 rpm at the shaft which would require a larger sprocket at the bike then the shaft lol doubt that's possible. I guess the stock motors can get speed because the centrifugal clutch ends up with a ratio less than 1.


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Aburdett

Am I reading wrong? I might be even more out of line

Primary reduction ratio 1.553:1
1st - 2.687:1
2nd - 2.052:1
3rd - 1.681:1
4th - 1.450:1
5th - 1.304:1
6th - 1.208:1

Final reduction ratio 2.470:1 (42/17)

The stock sprocket is 42/17 I think. So not sure what final reduction ratio is. If it's the total engine to trans output?


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Aburdett

Been doing some more reading and thinking. I think will be stretching the frame as well and adding another row of seats for 4 total for the wife and kids. Can the extra seat setup be bought? Thinking I might try find another cheap cart and just take the back for it.


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