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Post by ritous1 on Jan 23, 2013 12:15:26 GMT -5
will be installing the naraku 90cc kit pretty soon and I've been researching the available up gear kits out there. A little confused on the naraku 10% kit. They claim that most qmb139's come with 52/16 or 51/15 and the only info I can find lists the naraku as either 52/14 or 51/14 both of which seem to be going in the wrong direction to increase top end. The scrappy kit is 50/16 or 49/17 and the hoca stuff ranges from 42/16 to 46/18 which all seem correct assuming your engine has enough torque to drive them. What's up with the naraku set? Are the specs just wrong?
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Post by ritous1 on Jan 23, 2013 12:16:22 GMT -5
anyone think the 90cc would have enough oomph to benefit from the hoca gear sets as opposed to the scrappy set that everyone runs?
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Post by skuttadawg on Jan 23, 2013 12:23:18 GMT -5
Would be easier to try heavier roller or slider weights or larger diameter variator
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Post by millsc on Jan 23, 2013 12:30:47 GMT -5
I run a 50/16 set because i have alot of hills where i live and wasn't willing to sacrifice acceleration or hill climbing power it was more important than top end for me. The hoca sets are very tall gears it would make take off more sluggish and the hill climbing power would be decreased but the top end on flats would be awesome. I ride in town where its stop and go and many hills the naraku set would be great for hills and stop and go and i plan to get some for my project scoot realistically with the mods you have planned to get the stock gears will get you 50 mph gps with good accerelation and hill climbing. My scoot will do around 60 gps but rarely if ever do i need to go that fast all roads i ride on are under 40 mph. Thats why im gonna get naraku gears for my next project to have the acceleration and hill climbing to get through town without issue and probably just go with a 80cc kit for reliability and give my extreme modded scoot a break. With all the mods i've done to my scoot i still have that fear of when will it blow up.
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Post by ritous1 on Jan 23, 2013 12:36:09 GMT -5
I'm sure it would be easier, especially since I'd have to remove some of that stuff to install the hd crank, but I'm thinking the gears will be more effective at increasing top end albeit at the sacrafice of some torque. I wanna see how fast this thing can go!!
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Post by millsc on Jan 23, 2013 12:37:52 GMT -5
I say get the naraku gears it probably could pop a wheelie without pulling up on the handlebars and would be a monster for in town driving.
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Post by ritous1 on Jan 23, 2013 12:39:35 GMT -5
yeah definitely need the hill climbing power too. It would be both funny and awesome to have a sluggish scoot that could eventually get up highway speeds
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Post by skuttadawg on Jan 23, 2013 12:39:51 GMT -5
You can also try changing out the clutch and torque sprins in order to tune the CVT
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Post by millsc on Jan 23, 2013 12:40:43 GMT -5
I get the best of both worlds with 50/16 gained top end and didn't lose any torque.
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Post by ritous1 on Jan 23, 2013 12:48:01 GMT -5
Nice! also hard to argue with the price of the scrappy set
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Post by millsc on Jan 23, 2013 12:50:09 GMT -5
50/16 gained me 5-7 mph you can gain more with a taller gear but will sacrifice acceleration and hill climbing the 50/16 gears gave me more on the top without sacrificing anything.
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Post by skuttadawg on Jan 23, 2013 12:57:16 GMT -5
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Post by ritous1 on Jan 23, 2013 13:11:14 GMT -5
skuttadawg, you're definitely right as well. I've got a long list of parts I plan to order for the cvt in another month or so, just looking at gears now because of the relatively low cost compared to performance variator kit, clutch, bell, etc. etc.
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Post by skuttadawg on Jan 23, 2013 13:14:42 GMT -5
My Echarm was improved with Dr Pulley sliders
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Post by ritous1 on Jan 23, 2013 15:05:22 GMT -5
millsc, I guess it depends on what ratio the scrappy set actually is since it's advertised as 50/16 on the main page but 49/17 when you add it to your cart.
50/16=3.125:1
49/17=2.88:1
42/16=2.625:1
Scrappy also describe them as 2.88 on the main page. If that's the case, then the 42/16 hoca set shouldnt loose too much low end. It's about another 10%
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Post by ritous1 on Jan 23, 2013 15:06:45 GMT -5
the packaging does say 50/16 as well, from what i've seen on his ebay store
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Post by ritous1 on Jan 23, 2013 15:18:08 GMT -5
not being argumentative, I'm probably gonna go with the scrappy set, but the idea of a little 50cc scoot being able to run at close to 65-70mph is just so awesome. Would probably be scary as heck
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Post by ritous1 on Jan 23, 2013 15:26:13 GMT -5
i think having a big scoot will make me proud
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Post by ritous1 on Jan 23, 2013 15:27:07 GMT -5
That last comment was my coworker trying to be funny. guess I shouldn't be on the forum at work
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Post by inuyasha on Jan 23, 2013 15:43:31 GMT -5
not being argumentative, I'm probably gonna go with the scrappy set, but the idea of a little 50cc scoot being able to run at close to 65-70mph is just so awesome. Would probably be scary as heck[/quote Hi Thats wishful thinking for a 90 cc 4t bbk even with the up gear My 95 cc 4t redstreak hits a high of about 55 mph max and she has all the high performance parts and machine work you could imagine scootdawg.proboards.com/index.cgi?board=rides&action=display&thread=55327Now a 2 t scoot could hit those speeds, in fact my "April" hit an all time high recently of 63 mph Take care and ride safely Yours Hank |
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Post by yosemite on Jan 23, 2013 15:54:58 GMT -5
Inuyasha, is telling you the truth he has one of the fastest STOCK 50cc scoot you can get the Aprilla. Those puppies will do 55 stock and you can get them to do 70mph very easy.
Sam
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Post by millsc on Jan 23, 2013 19:21:34 GMT -5
Mine averages 50 - 55 gps
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Post by prodigit on Jan 23, 2013 20:03:19 GMT -5
Mine reaches to 50MPH, on a stock 50cc. The rollers can do something about acceleration, and hill climbing, but the gears do something about top end as well.
A 90cc is almost double the cc's of a 50cc. It's probably close to 175% of torque and HP of a 50cc. So you could put the tallest possible gear on there, for maximum top speed, if you're riding on level ground.
Then compensate the acceleration by changing the rollers.
Getting a larger variator may not always be a good thing. It sometimes can result in too much belt tension, and the belts may snap.
If you have a very tall gear (large gear ratio), and low acceleration, you can compensate it by using smaller rollers.
It's balance work, where going uphill, the RPM's lower, then the variator will go into lower gear to get your engine running near to the max RPM's. In such case a very tall gear ratio gets compensated by the variator, and you don't need to suffer too much speed loss going uphill.
Just make sure you have a good belt in place. At 90cc's it's handling almost twice the pull it normally should.
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