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Post by badmotorscooter on Jul 1, 2020 14:05:42 GMT -5
I picked up a 2010 SYM mio 50 for a thousand bucks with only 180 miles on the clock. The original owner let it sit for so long he had to replace the carb (with a genuine OEM Keihin) and the battery. Here's the original thread regarding derestriction:
It has a few minor garage scuffs but still looks pretty new. Got my hands on some euro style turn signal lenses to move the front blinkers down to the cowling where they belong. After some minor restrictions were removed it runs pretty spiffy. Acceleration is pretty zippy for a 49cc 4t and it tops out about 40 or so.
Good enough for sure, but I noticed at max speed the revs hit about 8800 (courtesy of Tiny Tach). Considering max horsepower is 7500 and the torque peak is below that, I'm gonna tune it to run 8000 rpm's at top speed. Could do that by shaving the drive boss a few millimeters and going a littler lighter on the weights to maintain the same acceleration. But I found a made in Taiwan racing variator for $38 and gonna give that a try first. Stock weights are 6g, ordered some 4g, 5g, and had some 7g laying around so I should be able to dial it in and then switch to +1g Dr. Pulley sliders when it's done.
Had a #65 drill bit laying around so drilled out the stock #88 main jet to about #89 (had an extra main jet from the old carb). The main jetting is close, will try one larger and see if that makes a difference.
I have to cover about 2 miles of highway on my 10 mile trip to town, and I just don't see the need to have the motor screaming at 8800 rpm's at WOT (still sounds smooth though).
Gonna wash, wax and polish the chrome, then post some pics.
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Post by badmotorscooter on Jul 2, 2020 14:30:59 GMT -5
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Post by badmotorscooter on Jul 6, 2020 21:02:37 GMT -5
No variator parts have arrived yet. Tempted to shave the boss already, but that would be foolish without trying the new variator first. To placate my need to tinker and mod I put a windshield on it. This was a Sportech that graced my previous Lance PCH 150 for 3 1/2 years and 10,000 miles. I had already cut it down in width and height shaving off about 25-30% of the area and bent the mounting bars so that it leaned back to match the fork angle instead of sticking straight upright. Went right on the SYM Mio, perfect fit with no fiddling. I should have got a pic from the side showing the angle, but here's what it looks like from the front.  |
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Post by badmotorscooter on Jul 7, 2020 0:01:08 GMT -5
Test rode with the windshield and it works perfect. Airflow is just over my face shield, no buffeting and it is well below my line of sight.
I did discover something else though, the cdi is rev limited. I hit 41mph on level ground and on a steep downhill. The tiny tach reads around 8800-8900 rpm's max, so I'm guessing the rev limiter is set at 9000. This is more of an engine speed limiter instead of a speed restriction. No plans to replace the cdi and spin the little jewel any faster.
I am sure that variator tuning will get the revs down where actual engine power is the limiter on top speed. I don't expect to see any more than 45mph with the stock piston, and would be quite happy with that (if I reach it!).
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Post by badmotorscooter on Jul 18, 2020 16:14:33 GMT -5
Got some different roller weights delivered, but no variator yet. Couple of more aesthetic mods though, I almost feel like this should be more of a "what did you do to your scooter today" topic. But I will definitely update when I get all the variator tuning results. Top speed unrestricted with stock variator is about 41 mph. I figure with Dr. Pulley sliders, a shaved boss, and maybe one size larger main jet 45 mph is doable. Remember this SYM engine has a 12.6 to 1 compression ratio and seat of the pants tells me with proper tuning it has the balls to pull 45 without a BBK. Pretty amazing for a 49cc 4-stroke, but my Yamaha C3 could do it, so it's within the realm of possible... So here are some pics showing the body cowling winkers (those stock winkers on the rubber stalks were just too ugly!), chrome luggage rack (replaced stock grab handle), and a Givi 26 liter topcase transplanted from my Lance PCH 150 (like the windshield).   |
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Post by badmotorscooter on Jul 18, 2020 16:22:28 GMT -5
If you compare the last pic to the second and fourth ones, you can see that I finally put metal paneling on a scooter shed that I built over two years ago and just covered with a tarp. My neighbor kept telling me he could get some metal paneling for $10 a sheet so I kept waiting. It was framed for panels 36" wide, but those won't fit in my car so had to get 24" ones (got tired of waiting). A little extra framing and now now my scooters have a real home.
I'll probably switch the topcase out for a basket when I find something I like. I saw a few but the were going for nearly $50, no thanks.
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Post by pinkscoot on Jul 18, 2020 16:27:57 GMT -5
Those are nice looking scooters but I am partial to the retro look.
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Post by jloi on Jul 18, 2020 16:58:13 GMT -5
love this quote too
" "Money is human happiness in the abstract; he, then, who is no longer capable of enjoying human happiness in the concrete devotes himself utterly to money."
fine looking scooter
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Post by badmotorscooter on Jul 20, 2020 23:54:59 GMT -5
Overwhelming and oversized. After looking at the very functional windshield and topcase, they just seemed too large and they ruined the lines of a neat little stylish scooter. I finally found a basket very similar to the one on my bicycle for $17.48. And that's all she wrote, basket off the bicycle onto the scooter and shaved 5" off the bottom of the windshield and proceeded to lower it. I was patting myself on the back as the cut came out very well. Used two of the existing mounting holes and had to drill two new ones higher up on the windshield. I drilled pilot holes and as I carefully enlarged the first one misfortune struck. The plexiglass cracked and shattered around the drill hole. Disgusted I put the stock mini-windscreen back on and called it a day. After sleeping on it I continued to look for options. The only smaller windshield I could find was 40cm tall and looked pretty bland, I was looking for something around 30cm. All of the universal/generic ones were even taller. Got to work on the broken windshield and shaved they upper edges where the new mounting holes were started, making the upper half narrower. The bottom part was already shaved narrower to clear the front brake reservoir. So now it looked like it had "wings" about a third of the way up were the original mounting holes attached the hardware. Shortened the vertical mounting rods and went with just two bottom mounts. I was surprised with the end result. It looked stylish and was about the size I was looking for. Took it for a test ride and it was very solid with no movement. The upper "lip" was still intact and the wind was directed to about my chin, but no buffeting or undesirable turbulence (only dealing with 40mph). I was able to scrunch down a little bit, lean forward and pull my elbows in to find a nice quiet pocket out of the air stream. Perfect, wanted something as small as possible with decent rain protection should the need arise. Less wind resistance and picked up about 1 or 2mph on the top end. The windshield isn't that easy to see in the pics, but here it is:   Glad I didn't throw in the towel and kept at it! |
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Post by 190mech on Jul 21, 2020 4:01:47 GMT -5
A step drill is the go-to drill for plexiglass..  |
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Post by jloi on Jul 21, 2020 8:04:15 GMT -5
that looks fine to me .I think it fits right in .
thanks 190mech -that's great to know
"A step drill is the go-to drill for plexiglass.."
now , hopefully , I won't crack any more of mine.
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Post by badmotorscooter on Jul 21, 2020 12:23:19 GMT -5
Thanks for the tip on the step drill bits!
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Post by badmotorscooter on Jul 23, 2020 1:26:51 GMT -5
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Post by Zino on Jul 23, 2020 7:07:14 GMT -5
I like your c3 wind shield the stock one is haed to tuck behind
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Post by badmotorscooter on Jul 23, 2020 13:53:45 GMT -5
I had the option to change the size since I had to buy a plexiglass sheet. I went for a little more coverage without increasing the area too much so that the 49cc motor doesn't have to push too much air. The stock mounting system worked great and by drilling the holes a little wide I was able to flex the windscreen and give it a nice curve.
Zino, you have a C3? I was looking for one until the deal on the Mio 50 popped up. I miss my C3 and will probably look for another one when I get to New Mexico.
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