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View Full Version : So what chain and drive sprocket do I need?



Lionstrike
17 January 2011, 1343
It looks like I've got a 48 tooth rear sprocket and I guess it uses 520 or 530 chain according to this website right here:

http://www.reginachain.it/eng/products/motorcycles/yamaha.shtml
(Yamaha Seca XJ600... something or another)

So my friend said that he'd weld some tabs for my motor mount in a few weeks... but he'd need chain, a master link and the drive sprocket.

I can get chain anywhere, but how do I know if it'll be the right one for my bike? And this drive sprocket business... 5/8bore, 50 pitch... huh? What again? I thought that pitch was the distance between rollers and was measured in fractions of an inch.

So this guy... is confused. Usually when you need a chain you just walk right up to the dealer and have him put it on. But since I am building this madness myself... this is something of an unusual situation.

Any ideas fellas?

teddillard
17 January 2011, 1356
the most awesome sprocket calculator evah!

http://www.compgoparts.com/TechnicalResources/SprocketCalculator.asp

frodus
17 January 2011, 1439
Lionstrike.....

Since you don't know what the final distance is going to be, or final gearing (you might want to go up or down one tooth on the front depending on final results)..... I would get some cheap machine chain. 530 chain is what I'd recommend because its very hard to find 428 or 520 sprockets for 3/4" and 7/8" shaft sizes. Its a mix of metric and standard. It just so happens that ANSI #50 and 530 chain is the same width and pitch. Otherwise you might need a custom machined sprocket.

Here's what I did. I went to www.surpluscenter.com and got the following:
Chain break (http://www.surpluscenter.com/item.asp?item=14-1037&catname=)
some ansi 50 front sprockets (I'd recommend getting 11/12/13/14 so you can experiment) (http://www.surpluscenter.com/sort.asp?catname=powerTrans&keyword=PH50)
some Ansi 50 machine chain (it won't be permanent, its for fitment and tuning) (http://www.surpluscenter.com/sort.asp?catname=powerTrans&keyword=PC50)
some master links and halflinks (http://www.surpluscenter.com/sort.asp?catname=powerTrans&keyword=PL50)

Now, do some calculations, and use something close to 5:1 for a larger motor, or 6:1 for something like an etek.

Then get a rear sprocket from sprocket specialists and tell them you want the bolt pattern for your bike, but you want it to be for 530 chain.


Fit everything on, get it wired, get the bike out and ride it. Then come in, change the front sprocket and see if you like the results. Tune it until you find the exact ratio you like. Then you can find a few places online where you can order the exact number of links you want. YOU tell THEM what you want. Usually there are kits with a predetermined number of links, but you don't want that. You just tell them "I want xxx number of links on 530 o-ring chain". If they look clueless, go somewhere else.

I ordered the machine chain and all the stuff above and it really helped simplify and it was super cheap, rather than experiment with "trusting" someone to get me the right chain. I've had to lengthen the chain a little becuase the 11:60 ratio I had was a little much, so I went to 12:60. Just needed one more link, but it was a snap to change and tested well.

teddillard
17 January 2011, 1719
Hey Travis, I don't get where you're coming up with 5:1 or 6:1. I'm running a Mars (RPM 3000-3200) with an 18" rear... and a ratio of 3.5:1, top speed of around 65-70mph. You running higher RPM motors? (..but you mention the Etek)

...also, Sprocket Specialsts, how do you get in touch with those guys? Their site requires a login.

DaveAK
17 January 2011, 1738
...also, Sprocket Specialsts, how do you get in touch with those guys? Their site requires a login.
That's new, it never used to require a login.

DaveAK
17 January 2011, 1739
Hmmm. Something must be up with their site. I can't even get to it.

frodus
17 January 2011, 2300
Hey Travis, I don't get where you're coming up with 5:1 or 6:1. I'm running a Mars (RPM 3000-3200) with an 18" rear... and a ratio of 3.5:1, top speed of around 65-70mph. You running higher RPM motors? (..but you mention the Etek)

...also, Sprocket Specialsts, how do you get in touch with those guys? Their site requires a login.

About the ratio, that's kind of a low ratio.... how many amps are you drawing? It must accelerate really slow. I had a 4:1 on my motorcycle when I first got it running with a much larger motor and it was a slug. Top speed is good, but acceleration is really poor. It's not that is bad, but I guess most of the conversions I had seen previously had a higher ratio than that. Maybe you can give us some idea on how high the amps are at a standstill and how it accelerates? Maybe something closer to 4 or 5:1 than 6:1.

Not sure why the site is down, prolly doing website work.

sparky_mark
18 January 2011, 0330
So you are saying that you pick your ratio to give either good top speed with poor acceleration, or good acceleration and poor top speed? Gee, if only there were some way to have more than one gear...But you'd need a box to put these gears in...Now, iff only someone would invent such a device..... :)

teddillard
18 January 2011, 0405
It works perfectly. I get 0-60 in about 8 sec, top speed of about 70, I draw almost 275 amps- all exactly what the numbers predicted. The bike is significantly lighter than most, though- around 250lbs.

(sparky- HAHAHHAHAaaaa shaddap, you.)

EVcycle
18 January 2011, 0437
I run between a 4:1 and 4.5:1 With the Mars RT. Good acceleration, 65 to 70 with a 325Lb motorcycle (w/o rider).

If running lead or a heavier bike, you need more toward 5:1.

Lionstrike
18 January 2011, 0726
Thanks guys, that's a lot of GREAT information.

I know that I am dealing with some folks that are in the know if you can say it in such a way that even a dunce like me can understand it.

frodus
18 January 2011, 0905
It works perfectly. I get 0-60 in about 8 sec, top speed of about 70, I draw almost 275 amps- all exactly what the numbers predicted. The bike is significantly lighter than most, though- around 250lbs.

(sparky- HAHAHHAHAaaaa shaddap, you.)

Ahh, thats right.... its light as hell. Mine was a bit heavier (150 chassis, 50 motor, 150 batteries.... so about 375 with everything on it) And I think I only ever drew 150A. I was more going off what I've read on evalbum as the ratios. So for lighter bikes, something between 3.5 and 4.5 and you're good to go if the bike is light. If its heavier, go with a higher ratio. Maybe I'll change mine more towards 4.5:1. It SHOULD be under 375lbs or so.

Tony Coiro
18 January 2011, 0916
So you are saying that you pick your ratio to give either good top speed with poor acceleration, or good acceleration and poor top speed? Gee, if only there were some way to have more than one gear...But you'd need a box to put these gears in...Now, iff only someone would invent such a device..... :)

Hahahah, oh no. Not again.

Nuts & Volts
18 January 2011, 1005
Tony its a cycle, a never ending cycle. Until someone tests it of course :) :)!! haha lets not go there

Anyway I am running a 5:1 on my agni (5000ish RPM max). My bike is about 420-430 lbs I thnk, so a little heavier. I hit about 65 at this gearing, with ok acceleration.

Kyle

chdfarl
18 January 2011, 1007
So you are saying that you pick your ratio to give either good top speed with poor acceleration, or good acceleration and poor top speed? Gee, if only there were some way to have more than one gear...But you'd need a box to put these gears in...Now, iff only someone would invent such a device..... :)

Never speak of the gear box on Elmoto! It is frowned upon ;(



http://www.elmoto.net/showthread.php?571-Transmission&highlight=transmission

EVcycle
18 January 2011, 1125
Gear Box????
Nooooooooooooooooooooooooooooooooooooooooooooooooo ooooooooooooooooooooooooooo


:)