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Post by frank101 on May 28, 2012 16:19:59 GMT -5
... without increasing displacement.
the top speed of my scoot is 63km and I want to try and shorten the time it takes to get to that top speed as well as improve hill climbing
.. and hello everyone, I'm new to scootering and to this site:)
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Post by Deleted on May 28, 2012 16:47:25 GMT -5
depending on the weight of your variator rollers, you can use lighter ones to raise the engine rpm into the peak torque/horsepower range. a free flowing air filter and possible carb rejetting will offer some gains as well.
outside of that, there is not much else.
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Post by reveeen on May 28, 2012 17:53:15 GMT -5
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Post by Deleted on May 28, 2012 17:53:20 GMT -5
a windshield helps top speed also.
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Post by Deleted on May 28, 2012 19:28:32 GMT -5
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Post by revweasel on May 29, 2012 8:45:27 GMT -5
... without increasing displacement. the top speed of my scoot is 63km and I want to try and shorten the time it takes to get to that top speed as well as improve hill climbing I find that placing the scooter in the back of a pickup driven by a teenager does wonders for acceleration. honestly, you can do tricks like changing weights (which will provide some benefit but not what you are looking for) and rejetting, etc ,etc. but to see any real changes you must increase your torque and/or HP output. variator weights adjust where u are in your torque band. but we are talking about providing single digit percentage increases in power. like 5-10% or so. you cant feel that... if you want more power, install more power. $100 BBK $10 spark plug $10 air filter $20 jet kit $30 CDI and coil $20 rollers or sliders $0 holes in exhaust pipe A head is also recommended but i didnt put one in and i am very happy with it. might do that next year. but improvements cost $$$$ there is now "free" performance upgrade. |
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Post by 90GTVert on May 31, 2012 8:51:03 GMT -5
:welcome: to the forum. Since you are primarily looking for acceleration from the sound of your post, tryling lighter roller/slider weights would be my first guess. That would get the revs up more for acceleration. The problem is that if they're too light you'll rev past your peak output and go slower. You actually have to tune, can't really just swap parts and expect good results.
Why nothing over 49cc? Big bore is the mod that gives the best improvement usually (accompanied by tuning the carb and roller weight to suit the new power). Is it that you don't want to spend the money on the big bore or are you trying to stay legal with the displacement or is this just a challenge for you to see how fast a 49cc can go?
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Post by frank101 on Jun 7, 2012 16:19:17 GMT -5
are there any performance gains, or losses, if you use Dr Pulley sliders that are same weight as the stock rollers?
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Post by reveeen on Jun 7, 2012 16:52:13 GMT -5
Typically, because of their shape, you would install a heavier slider (approx. 1 gram each) than a roller, for the same result as given by the roller.
For example: you would replace 3 gram rollers with 4 gram sliders.
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Post by Fox on Jun 7, 2012 19:20:28 GMT -5
If you want to increase acceleration without losing top end get some 5 gram sliders.
Lighter rollers cause the engine to rev higher all the time so you increase torque. The trade off is lower gas mileage but it's worth it IMO
You can get a preview of the gain by removing 3 of the 6 rollers you have in there now and riding it. Take out every other one so the variator stays balanced. You will see how the engine revs higher and it will take off faster but you'll prolly be too light with just three stock rollers in there so you will lose top end. Typically stock weights are around 7-8 grams.
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Post by johnnymac01 on Jun 19, 2012 7:04:27 GMT -5
The best thing I've done so far is get a "decent" exhaust. I'm pretty new to scoots also, and have a 70cc Stage6 ProSport BBK project sitting here waiting for my new carb, but the exhaust was a good first project and an easy swap for a great gain in power/acceleration/top speed. This is assuming you've de-restricted the scoot fully. You should be able to get a good quality exhaust for $150, a new set of sliders for $25, maybe a small upjet for $5, and you'll be lovin' it. Mine went from slushy to zippy! But then it is a 2 stroke, not 4 stroke like yours.  JM p.s. DO NOT get a cheap exhaust thinking you're saving money. It most likely will not perform, so you'll have to get a new one anyway. Ask me how I know... :doh: |
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