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Post by carasdad on Jun 8, 2013 20:29:13 GMT -5
Suffering a little QMB139 long case confusion. Bought a 2012 Peace Sports B09 from a kid for near nothing. Already has a BBK and pipe. Problem is he had the same Mechanic up gear it. But they went way to high so take offs are slow...takes 3/4 mile or so to hit 40 and then 5k rpm is about max you can go. Puts it out of the power band quite a bit for most of the ride. He does not know what gears they put in....just that they were the highest they could find. Sooo...here is my question...please help. I need to know what your stock longcase gears were..15/54 with 13/32...etc. Reason is....I want to know what the normal stock ones are so I can use those numbers to calculate a decent gear ratio...vice whatever is in there now. What is in there now would be great if everywhere you drove was downhill with a good wind..  Thanks in advance for your help, Glenn |
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Post by JR on Jun 8, 2013 20:37:45 GMT -5
I was under the impression that you just had two choices in gear sets for them.
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Post by triker on Jun 8, 2013 21:01:19 GMT -5
I do not know about the long case engine, but all 3 of my short cases came with 15/51 gears. Doug, I have 4 different gear sets for a 139qmb they are: 16/50, 16/42, 18/46, 17/41.
Roy
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Post by carasdad on Jun 8, 2013 21:15:51 GMT -5
I do not know about the long case engine, but all 3 of my short cases came with 15/51 gears. Doug, I have 4 different gear sets for a 139qmb they are: 16/50, 16/42, 18/46, 17/41. Roy Thanks. ok they came with 15/31...is that the primaries? What were the secondaries? That is what I am looking for...what the primaries and secondaries are...or were. Just secondaries or just primaries does not give me much to go on...I can't figure a good ratio to drop down to unless I know what stock gears are for primary and secondary..  @ doug. Ok so if you only get 2 choices in stock gears what are they??? You forgot numbers. Also something that would help greatly....what is the typical final ratio... 10:1 11:1 etc. My 2T Hornet and all other Hornets came with a 13.5:1 ratio. Sooo....see what I am trying to figure out? Just telling me primaries or secondaries is only part of the equation...it is like somebody asking me how to make a cake...and I tell them.. "Add 2 cups of flour..2 eggs..1/4 cup Vegetable Oil..." Then walking off leaving them to guess at the rest of the recipe... ;D |
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Post by triker on Jun 8, 2013 21:25:51 GMT -5
Stock primary gears are 16/52 and the secondary is 15/51
secondary final ratio's are:
15/51=11.05:1 (stock)
16/50=10.15625:1
16/42=8.53125:1
18/46=8.3055553:1
17/41=7.4027775:1
Hope this helps.
Roy
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Post by carasdad on Jun 8, 2013 21:44:40 GMT -5
Stock primary gears are 16/52 and the secondary is 15/51 secondary final ratio's are: 51/51=11.05:1 (stock) 16/50=10.15625:1 16/42=8.53125:1 18/46=8.3055553:1 17/41=7.4027775:1 Hope this helps. Roy Roy...Bingo!...woo hoo...that is what I was looking for....  Huge thank you! |
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Post by triker on Jun 8, 2013 22:09:06 GMT -5
You are welcome. I had it wrote down in my note book, it just took me a while to find it.
Stock primary ratio is: 52/16 = 3.25
Stock secondary ratio is: 51/15 = 3.4
Stock final ratio is: 3.25 x 3.4 = 11.05:1
Roy
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Post by millsc on Jun 8, 2013 22:49:05 GMT -5
i have the stock gears for the b 09r will let you get them for price of shipping let me know, my new scoot is a b 09 r my 16/50's are great in it
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Thanks in advance for your help,
