Clinician
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Post by beebo on May 26, 2014 12:36:42 GMT -6
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Clinician
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Post by beebo on May 8, 2014 20:41:07 GMT -6
At idle your alternator is not putting out very many amps. As your rpm's go up, your alternator puts out more juice. So, you are right--those bright bulbs might be drawing more amps than your alternator can keep up with AT IDLE. How big are those bulbs anyway? If you put 2X55W bulbs in there, you may never put out enough amps at any rpm. So I would not get too carried away here. I had to replace my stock 35W bulbs last summer. My dealer gave me 25W bulbs to replace them with. He said I probably wouldn't notice the difference in brightness..he was right. I couldn't see too well with the 35W bulbs and I can't see with these 25W bulbs, either Anyway, as a suggestion, before I went through the pain and suffering and expense of putting a bigger stator in, I would either put those smaller bulbs back in, or if you really like them, change all my other bulbs to LED's to try to bring my total amp load down, and set my idle speed up as fast as I can go without the clutch trying to grab, and maybe put a bigger battery in to gain some reserve amps. On my bike, stock battery is a 9AH and I replaced it with a 12AH that fit in there (same dimensions). It gives me a little more CCA's, might take a little more time to charge, but I haven't had any more starting problems.
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Clinician
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Post by beebo on May 6, 2014 19:55:59 GMT -6
You know, of all the tuning aspects of these little carbs, the diaphragm/spring is one I would not mess with. There is a delicate balance between the airflow/vacuum/enrichener rod/main jet that is tuneable with just changing the main jet, or if needed, the taper of the needle. That is really all you need to mess with for a fairly stock motor. If I felt it was absolutely necessary to fool with the spring, I would try to find a kit--let someone else with the proper resources and equipment figure out the best combo to use. Owning a Harley with a Keihin CV carb, I know there are kits out there for my bike--they include jets, needle, and spring that are matched for my specific bike. I don't know, however, of a similar kit for these little scooters. And I would consider the benefits gained for the cost involved. To me, spending 50 to 100 dollars for a 1hp gain would not be worth it. Just sayin'...
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Clinician
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YY250T-1
by: beebo - Apr 27, 2014 11:41:52 GMT -6
Post by beebo on Apr 27, 2014 11:41:52 GMT -6
I would check the headstock bearings, too, by putting the bike up on the stand so the back wheel is off the ground. lean on the back end so the front wheel is off the ground, then wiggle the front wheel/forks and look for play in the head stock. It is just like a bicycle, ball bearings(don't be surprised if there is no grease in there).
While it is on the stand, check for play in the swing arm. When I checked mine, I could spin the washers on either end with my fingers. It looked to me to be a long through-bolt with a pinch nut, washers, and rubber bushings instead of bearings--I hope I am wrong. but I snugged the nut up, and also the nut/washer/bushing at the front of the motor mount.This reduced my vibration problem to some degree, also.
While it is still up in the air, pull the cover off the CVT and inspect your belt. Start the bike and check the belt while it is running. The belt should run smooth and tight, all the way through its gear range and back down to idle again.If you see lots of deflection in the belt, I would be looking at the torque spring first. On my bike, I could easily spread the sheaves against the pressure of my torque spring--it was that weak. I had about 2 inches of deflection while running--the belt was actually wearing against the inside of my cover! I replaced my torque spring with a "white" spring from MPS Racing, and the personality of this bike changed drastically!! It is like a whole new bike! I went from anemic and full of vibration to smooth and powerful and fun to ride!
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Post by beebo on Apr 19, 2014 9:28:19 GMT -6
@ Bashan: Mine is a Roketa branded YY250T w/13" wheels and some minor mods/tuning tweaks. 2011 I think. I modified my intake and exhaust, re-jetted the carb, changed out the torque spring to a stiffer one, haven't messed with the weights...yet. I think I can gain some performance with lighter weights...might try it this spring.
This scoot would barely do 55 when I bought it. Now it will barely do 80. Now it gets around more like I expected it to do when it was new. And I swear, even with 6200 miles on it, it STILL feels stronger with every ride!Gotta love it!!
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Post by beebo on Apr 18, 2014 21:50:03 GMT -6
I don't know--maybe I'm just lucky, but my speedo reads within 2-3 mph of my GPS at any given speed. The last time I checked it with the GPS, I set the alarm at 80 mph and when it went off, I looked down at the speedo and it read about 82mph. When I got back to the house, I checked the GPS log file and it actually recorded a top speed of 81 mph. Now that was with new Shenkos, which seemed to be a little taller than the stock tires, tho they had the same numbers (size) as the original tires. I do think my odometer is a little optimistic, but not much. Maybe 5% or so. I am going to check that when the weather gets a little more stable around here.
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Post by beebo on Mar 26, 2014 20:12:00 GMT -6
I've had to use the kick starter before, and it wasn't easy. These motors must have some compression or something. I actually broke the gear off the shaft on that Sunl 150 I used to own, trying to start it. These scoots have barely adequate batteries and starters that barely get the job done with a good battery. Knowing I was going to have to spend money, I bought a 12AH battery to replace the 9AH original battery, and welded the gear back on that kick starter shaft, and had no more problems.
I try to take it easy on the kick starter, having broke one, so if my battery is a little down, I use the kick starter to "assist" the electric starter. Once the motor starts to spin, the electric starter will usually spin it until it starts. You won't find that one in the book, but it works for me!
Just as a "rule of thumb", if my starter "grunts" more than a couple of times, and I know my electrical system is in good shape, I am changing my oil! It doesn't take much heat to make the oil in these air-cooled motors start to break down. A fresh quart of oil is cheaper than a fresh rebuild...
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Post by beebo on Mar 2, 2014 11:00:13 GMT -6
It is at the front of the motor on mine. Follow that heavy red wire from the solenoid down to it. Kinda hard to see with all that plastic in the way, but it sits in front of the crankcase of the motor, and just under the front motor mount.
I was just out there looking at mine, and there is room to reach under there with a ford wrench and tap on it if needed. You might try jumping across the solenoid with a screwdriver of something metal to see if the starter works or if the solenoid is going bad. Making contact a couple of times across the solenoid might make it come loose if it is stuck. I've had that happen to me with the 150, but it had a kick starter, too, so I was able to free it by kicking the kick starter. Unfortunately, these 250's don't have one.
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Post by beebo on Mar 2, 2014 10:39:25 GMT -6
I was wondering, as I look out at the freezing rain coming down, what kind of gas mileage you are getting on your scooter. I rode my 250cc Jonway to work daily during the summer and fall, and averaged around 81 mpg. I don't know what the 150cc gets--I haven't rode it much lately. I've heard some 50cc owners say they get around 70 mpg. Sounds kinda low to me. How about you? What do you ride and what kind of mpg do you get?
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Post by beebo on Feb 3, 2014 18:19:49 GMT -6
The last line of that article points to a more likely motivation--$70K
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Post by beebo on Dec 14, 2013 19:34:09 GMT -6
Funny you should say that--I was just looking at a carb I pulled off my old 18hp briggs motor. It is a down draft carb, so fabricating an intake would take a bit of work. It might work on a 250, though.
You know, I did the same thing to my old VW--put the biggest jugs I could fit without boring the case, put dual port heads and a holley-weber off an old Pinto from the junkyard.It worked great! I loved those old carbs! They had a mechanical secondary that opened up at about 3/4 throttle, and really added some zip to a small motor. I thought about putting one on this old Porsche 914 I bought this summer, but a former owner had already removed the stock fuel injection and put a pair of dellortos on it! I think I'll leave well enough alone there ! But it does have one carb "barrel" per cylinder, much like my scoots, so have similar tuning issues. Maybe I'll fab some intakes and put 4 of these CV's on it...LOL
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Post by beebo on Dec 14, 2013 8:53:21 GMT -6
If you are having problems with your enricher and you know it is good, you might look at your low speed jet and idle mixture settings. Cold start mixture equals idle mixture+low speed jetting+ enricher circuit. Initial cold start enricher mixture is fixed as far as I can tell, so if your idle mix or low speed jet is set too rich, you will have problems starting with the enricher added in.
I had this problem one time with my JCL 150. When I got it, it wouldn't start unless it was hot outside. I would have to choke it with my fingers and keep fiddling with it until the motor had really warmed up. Adjusting the idle screw out only helped a little. So I drilled out my low speed jet and everything changed. It would start on the first lick in even the coldest weather, but would start to load up and die as the bike warmed up. If the bike sat long enough for the enricher to cool off, it would flood out and not start at all. I could crank the throttle wide open and crank the starter until the mixture leaned out and it would start. I had drilled that jet a little too much. I wound up replacing it with a #42 jet and that fixed my problem. It starts good when cold or hot, has real good throttle response and acceleration, doesn't load up when it is hot. Idle mix is about 1 1/2 turns out.
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Post by beebo on Nov 22, 2013 19:40:05 GMT -6
You know, somewhere around here I have a tool that I made from one of my wifes' stethoscopes. (she is a licensed CNA) I took off the disk shaped dealie on the end and attached a piece of steel brake line tubing and it makes a wonderful tool for listening to motor noises. Too bad it was her favorite stethoscope.
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Post by beebo on Nov 22, 2013 19:16:40 GMT -6
Probably cost you what- about 3 dollars in gas?
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My Hero
by: beebo - Nov 21, 2013 20:27:07 GMT -6
Post by beebo on Nov 21, 2013 20:27:07 GMT -6
Awsome video! He really scoots right along! I had actually seen this video before, didn't realize who it was. I really like the camera he is using. Also like the fisheyes on the mirrors. I need to put some on mine-I have too many blind spots.
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