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Post by mopedman1234 on Feb 25, 2019 15:12:38 GMT -5
Hi, I have a 2002 Yamaha bws 50 with a 70 cc big bore, polini air filter, and Yasuni Z exhaust. When I take off I have a quick burst of acceleration but then all the way up to 40 kmh it doesn’t pull very well. Once I hit 40 it hits top gear and gets in the power band and pulls really hard until too speed. I was wondering what contra spring clutch springs and variator weights I should adjust to.
Thanks.
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Post by aeroxbud on Feb 25, 2019 15:41:22 GMT -5
Have you jetted the carb for the 70 kit? Are you using an open filter?
Would definitely try some lighter rollers. If your belts not slipping I would leave the contra spring.
You could try stiffer clutch springs.
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Post by mopedman1234 on Feb 26, 2019 16:24:32 GMT -5
I have not re jetted the carb I have an open foam filter. When I put the 70 cc kit in i was going to see how it ran and it runs really good still. Belt rarely slips, only if the tire is spinning and it catches grip very quickly. Should I re jet
the carb so it can get all the fuel it needs or should I leave it.
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Post by pinkscoot on Feb 26, 2019 16:33:25 GMT -5
Definitely rejet. Lean scooters run great until they don't. Hopefully you just soft seize and don't fully seize it.
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Post by mopedman1234 on Feb 26, 2019 16:36:16 GMT -5
By the look of the spark plug it is not running lean, the spark plug is brown.
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Post by mopedman1234 on Feb 26, 2019 16:37:39 GMT -5
And it has also fouled a spark plug when i was starting it in the cold I had to kick it a lot but I think it’s getting a good amount of fuel.
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Post by aeroxbud on Feb 26, 2019 17:25:41 GMT -5
I would still go up on the main jet. If you have put a 70 cc kit and an open filter on without increasing the jetting, it will be lean.
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Post by mopedman1234 on Feb 26, 2019 18:06:43 GMT -5
Ok I don’t know what size the main jet is right now. What size should I get?
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Post by aeroxbud on Feb 26, 2019 20:43:44 GMT -5
It's always best to have a look at what's fitted. You will never know for sure till you look. That will at least give you a starting point.
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Post by mopedman1234 on Feb 26, 2019 20:54:38 GMT -5
Ok. Is there a way to measure or do they have the number or something
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Post by aeroxbud on Feb 26, 2019 21:53:46 GMT -5
Most come with a number stamped on the head
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Post by mopedman1234 on Feb 26, 2019 22:22:26 GMT -5
Ok thanks for the help... can I message you if I have any other questions?
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Post by repherence2 on Feb 26, 2019 22:45:02 GMT -5
Ok thanks for the help... can I message you if I have any other questions?
very useful to read through the Scoot FAQ section. there is a section on carbs and jets and tuning. a lot of your questions might be already answered there because there is a lot of detailed information.
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Post by mopedman1234 on Feb 26, 2019 23:12:11 GMT -5
How do I get to that section... I’m new to the app
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Post by aeroxbud on Feb 27, 2019 6:18:19 GMT -5
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