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Post by blacraven on May 28, 2013 11:28:11 GMT -5
Hello everyone,
50cc 4 stroke Shanghai Beta (Chinese scooter)
Here's my latest problem.
I'm driving to work and halfway there my bike starts to act like a car with a slipping transmission, that’s the best way to describe what’s happening. i noticed when i come to a complete stop, i can take off but if feels like its kicking into high gear way too early and I don’t get that quick speed pick up in low gear that I’m supposed to.
Then when I get a little speed it starts to rev again like a car with a slipping transmission and doesn’t pick up speed. If I kind of lightly pull the throttle I can kind of keep coasting but not pick up speed.
I just tinkered with my kick start before the ride and while doing so inspected my drive belt. So I’m pretty sure it isn’t that.
I’m thinking maybe it’s a rollers or clutch problem??? HELP
Thanks in advance.
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Post by lykos23 on May 28, 2013 11:55:27 GMT -5
[replyingto=blacraven]blacraven[/replyingto]Your rollers might've become sliders. Check that variator  While you're at it you may be interested in some new clutch springs. The 1.5k seem popular. |
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Post by blacraven on May 28, 2013 12:06:19 GMT -5
Thank you, ill check them now, also what info can you give me on the 1.5k springs and what they will do for me. I kind of know but not really
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Post by lykos23 on May 28, 2013 12:16:52 GMT -5
[replyingto=blacraven]blacraven[/replyingto]The spring strength determines at what rpm the clutch engages and the wheel starts spinning. Getting your engine to a higher rpm, approximately 1.5k higher, will give you better takeoff acceleration. It doesn't effect topend but in my opinion it's a great little upgrade.
They sell them everywhere, from scrappydogs to tvnacman's to amazon.
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Post by lykos23 on May 28, 2013 12:44:32 GMT -5
If your rollers turn out to be bad then I highly recommend replacing them with some quality Dr. Pulley slider weights. You'll be looking for any wear on them or if they've somehow bent and become oval-ish, they should be perfectly round with no flat spots.
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Post by blacraven on May 28, 2013 13:23:55 GMT -5
[replyingto=lykos23]lykos23[/replyingto]one other question, wont the different springs affect if I'm slowing down and want to pick up seed again, will it rev until it re engages? do you understand what i mean?
Ive hear people talking about this sort of thing.
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Post by lykos23 on May 28, 2013 13:28:09 GMT -5
[replyingto=blacraven]blacraven[/replyingto]That's why I recommended lighter springs such as 1.5k. The clutch will disengage at around 5-10mph (for me it's around 12-13mph) and then the engine will have to be revved until it reengages. But this is only a problem for very low speeds.
I use 2k springs and I love them ;D
no problems for me in actual traffic situations, and I just came home from the library where the afternoon stop n' go traffic was nuts and I had to go just 15mph through half of it, stopping and going.
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Post by alleyoop on May 28, 2013 14:46:18 GMT -5
Stronger springs are good if you have to go up and down hills in your area and or want jack rabbit starts. If it is mainly pretty flat terrain and are in traffic all the time having to go slow and or cruise at lower rpms I do not recommend stronger springs.
Just remember if your scoot currently starts to move at say 2500 rpms you add the spring rates to that value. So if you get 1000 rated springs then you add 1000 rpms to the 2500 now your RPMS have to rise to 3500 before it throws out the pads to grab the bell to start turning your wheel, 1500 springs 4000, 2000 springs 4500 etc..
Just so you know how it will effect your riding.
Alleyoop
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Post by blacraven on May 28, 2013 15:07:37 GMT -5
so will they make my bike jerk?
Also i want faster take offs, I'm in Philadelphia which is pretty flat but a decent amount of traffic. i just want to take off at a light and not slow traffic down because I'm too slow, or get out in traffic and up to speed fast so i wont get hit.
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Post by alleyoop on May 28, 2013 15:25:48 GMT -5
No it will not make your bike jerk.
So you don't care or need the max top end speed then, seeing your in traffic most of the time going from light to light or stop sign to stop sign?
If so you can go with lighter weights:
Rollers= For every gram up or down your rpms will change by 500-600.
Sliders= For every gram up or down your rpms will change by 200-350.
So lighter weights will keep the Belt lower for a longer period of time requiring more rpms to move them up so you will get quicker take offs and not so much MAX top end speed. The top end speed depends on how many rpms your motor can safely produce 4 strokes produce the max HP at 7500 rpms.
Alleyoop
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Post by lykos23 on May 28, 2013 15:26:50 GMT -5
If my bike with 2k springs doesn't jerk then your bike with 1.5k springs or less shouldn't jerk either  The springs are great for just that, at stoplights I can keep up with the cars whereas before I couldn't at takeoff. Then it took a lot of working on my mid range speeds to keep pace with traffic, and now I'm working on my hi-end speeds so I can excel in traffic. |
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Post by mrpalmetto on May 28, 2013 15:49:02 GMT -5
Are Dr Pulley sliders far superior to other brand name sliders. The price sure is superior. Do you get the price difference out of them?
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Post by blacraven on May 28, 2013 15:58:34 GMT -5
so it wont affect what i already have on my top end?
i don't want it to slow my overall speed down.
i wouldn't mind a better top end, i was thinking about upgrading to a 85cc kit.
I lost overall speed since i bought it about 2 years ago. it only had about 18mi on it it was new. i drove it from Lancaster, Pa to Philadelphia on the expressway and it was going so fast, I maxed out the needle to 50mph(REALLY, I know what everyone says but it was) I wasn't worry about the trucks to much I just stayed to the far right.(no helmet by the way, i know its stupid but they didn't have any and i had to get it home).
after about a few months i had pinched valves and had to adjust them, i got alot of speed back but never what it was when i first bought it. id be happy to get it back there but i dont know what to do.
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Post by hank on May 28, 2013 16:01:42 GMT -5
Are Dr Pulley sliders far superior to other brand name sliders. The price sure is superior. Do you get the price difference out of them? Hi I use Dr Pulley parts in my 4 t bbk scoot and my aprilia SR Im very happy with the performance and high quality of them I highly recommend the brand Take care and ride safely Yours Hank |
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Post by lykos23 on May 28, 2013 16:24:01 GMT -5
[replyingto=blacraven]blacraven[/replyingto]Well first you need to figure out what roller size you currently have, then you have to figure out whether you want slower acceleration and higher topend OR better acceleration and lower topend.
As Ally stated above each gram represents a difference in rpms. You'll want to go either up or down by one or two grams from the size you have (keeping in mind the difference with sliders meaning you have to add a gram for sliders) and then you should be set.
Dr. Pulley sliders offer higher topend by default so even if you get lighter weights you may still maintain the same topend. Right now I'm testing out my speeds with 4g weights and I can go a max of 39mph (48mph on the chinese speedo), but I weigh a bit more than the average rider, heh.
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