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gear ratio?
by: andrewrides1 - May 9, 2013 22:00:02 GMT -5
Post by andrewrides1 on May 9, 2013 22:00:02 GMT -5
stupid question. what is the standard gear ratio for the 1e40qmb if there is one. i wanna upgear and dont wanna look in the gear box and waist oil and what not. got a roketta
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Post by carasdad on May 9, 2013 22:19:28 GMT -5
stupid question. what is the standard gear ratio for the 1e40qmb if there is one. i wanna upgear and dont wanna look in the gear box and waist oil and what not. got a roketta Long case or short case? Which? Cause they are different. One is geared for a 10" wheel...the other for 12-13" wheels. Typically around 13.5:1 except in the case of the Minarelli 90cc...which are right around 10.2:1 REGARDLESS...this is NOT set in stone...you must count your primary and secondary gears teeth before you upgrade..otherwise you may not actually be upgrading....or you may be upgrading too high and will lose take off power and high end even.. Here is a pic of your gears..and labeled for ya. Attachments:
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Post by dude on May 9, 2013 22:47:00 GMT -5
Another way to see your overall ratio is to count how many times your clutch bell turns to one revolution of the tire. Your tire height also effects your ratio.
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Post by carasdad on May 9, 2013 22:59:59 GMT -5
Another way to see your overall ratio is to count how many times your clutch bell turns to one revolution of the tire. Your tire height also effects your ratio. Very true..it will give you the final over all ratio. But that is the total equation for both sets of gears. So if he is only planning on new primaries or secondaries...he will need to know the separate ratio each individual set. Hey..when you get that NCY Torque Sheave I mailed ya today...what are you putting it in...and will ya post a vid of the before and after? Would love to see one of those on an Aprilla SR50...yikes..that would scream! Found a resource for those rare n hard to find things. Price was a bit over double what they used to cost. The guy told me NCY is slowly moving away from 2T stuff as less 2T's are being sold..and that they are dedicating more time and money for new and better GY650 and GY6 150 items.  |
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gear ratio?
by: andrewrides1 - May 10, 2013 1:01:49 GMT -5
Post by andrewrides1 on May 10, 2013 1:01:49 GMT -5
thanks all. but while you were all giving great advice i was cracking the gear box. as carasdad said i have to know or i might of been doing myself a disservice. i didn't know about the tire. it turned out to be a straight 4:1 13/52 so since im puting in a bbk im going with a 14/32 which will be about the right upgear. thanks.
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gear ratio?
by: prodigit - May 10, 2013 15:05:46 GMT -5
Post by prodigit on May 10, 2013 15:05:46 GMT -5
Should it be too heavy, you can somewhat compensate with lighter rollers/sliders.
That way you don't have to lose too much take off speed, while top speed would be higher!
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gear ratio?
by: carasdad - May 10, 2013 16:45:00 GMT -5
Post by carasdad on May 10, 2013 16:45:00 GMT -5
thanks all. but while you were all giving great advice i was cracking the gear box. as carasdad said i have to know or i might of been doing myself a disservice. i didn't know about the tire. it turned out to be a straight 4:1 13/52 so since im puting in a bbk im going with a 14/32 which will be about the right upgear. thanks. You do know the 14/32 primary is going to give you a 7.25:1 ratio if your secondary is the typical 13/44 which is 3.38.1 3.38.1 X 2.28.1= 7.25:1 If your primary is as you said 13/52 and secondary is 13/44 you started out with a 13.52:1 ratio. Going to 14/32 on your primary from 13/52 is a 46.37% increase...with a final ratio of 7.25:1...your gonna need a tractor to pull those gears!!!  10:1 to 11:1 is what most shoot for. If you are doing a secondary gear swap with that 14/32 and primary is 13/52...you will end up with 9.14:1 which is still really steep and huge jump up. 32.39% So what are your current stock gears...primary and secondary? |
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gear ratio?
by: andrewrides1 - May 10, 2013 19:08:45 GMT -5
Post by andrewrides1 on May 10, 2013 19:08:45 GMT -5
thanks all. but while you were all giving great advice i was cracking the gear box. as carasdad said i have to know or i might of been doing myself a disservice. i didn't know about the tire. it turned out to be a straight 4:1 13/52 so since im puting in a bbk im going with a 14/32 which will be about the right upgear. thanks. You do know the 14/32 primary is going to give you a 7.25:1 ratio if your secondary is the typical 13/44 which is 3.38.1 3.38.1 X 2.28.1= 7.25:1 If your primary is as you said 13/52 and secondary is 13/44 you started out with a 13.52:1 ratio. Going to 14/32 on your primary from 13/52 is a 46.37% increase...with a final ratio of 7.25:1...your gonna need a tractor to pull those gears!!! 10:1 to 11:1 is what most shoot for. If you are doing a secondary gear swap with that 14/32 and primary is 13/52...you will end up with 9.14:1 which is still really steep and huge jump up. 32.39% So what are your current stock gears...primary and secondary? Im actually doing the kind of gears you get pressed so it so i quess it would be the middle assembly. |
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gear ratio?
by: carasdad - May 10, 2013 19:28:10 GMT -5
Post by carasdad on May 10, 2013 19:28:10 GMT -5
You do know the 14/32 primary is going to give you a 7.25:1 ratio if your secondary is the typical 13/44 which is 3.38.1 3.38.1 X 2.28.1= 7.25:1 If your primary is as you said 13/52 and secondary is 13/44 you started out with a 13.52:1 ratio. Going to 14/32 on your primary from 13/52 is a 46.37% increase...with a final ratio of 7.25:1...your gonna need a tractor to pull those gears!!! 10:1 to 11:1 is what most shoot for. If you are doing a secondary gear swap with that 14/32 and primary is 13/52...you will end up with 9.14:1 which is still really steep and huge jump up. 32.39% So what are your current stock gears...primary and secondary? Im actually doing the kind of gears you get pressed so it so i quess it would be the middle assembly. Got a link to the gears you ordered? That would help lots..and would like to see what ya got...and what ya paid. Gear sets for my longcase oddball Minarelli are 100+ dollars for 2 simple gears... |
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gear ratio?
by: andrewrides1 - May 10, 2013 19:33:48 GMT -5
Post by andrewrides1 on May 10, 2013 19:33:48 GMT -5
Scrappy under 2t 50cc performance. they only have those two sizes online I got mine by talking to a scrappy rep.
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gear ratio?
by: carasdad - May 10, 2013 19:46:23 GMT -5
Post by carasdad on May 10, 2013 19:46:23 GMT -5
Scrappy under 2t 50cc performance. they only have those two sizes online I got mine by talking to a scrappy rep. Ah ok...so what were your gear teeth counts for both original sets? Is this a short case engine?..i.e. 10" tires?.. |
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gear ratio?
by: andrewrides1 - May 10, 2013 19:56:35 GMT -5
Post by andrewrides1 on May 10, 2013 19:56:35 GMT -5
it was as i said 13/52 for those middle gear set. see pic those two in the middle.  forgive me for the pic i couldnt find a pic of a 1e40qmb gear assembly online so i had to scan my service manual. |
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gear ratio?
by: carasdad - May 10, 2013 20:07:33 GMT -5
Post by carasdad on May 10, 2013 20:07:33 GMT -5
Ok..so the gears you are replacing are the ones the arrows show as primary? They were 13/52 and you are replacing them with the 14/32? What I am curious to know..is the tooth count on the big gear marked in the pic as secondary. Attachments:
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gear ratio?
by: andrewrides1 - May 10, 2013 20:10:08 GMT -5
Post by andrewrides1 on May 10, 2013 20:10:08 GMT -5
that would be a 44 count sir. on the big one that is, my gears dont ressemble the ones in your pic. they are identicle however to the ones i posted. the gears im changing are the middle set the small one that is pressed in to the bigger one. do you kinda get it.
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gear ratio?
by: andrewrides1 - May 10, 2013 20:46:05 GMT -5
Post by andrewrides1 on May 10, 2013 20:46:05 GMT -5
actualy after doing some math you were right the second time it will be the 32% increase. my rim is about 11'' wont my engine pull the gears well with a bbk i mean i am increasing power by 40%.
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