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Post by jjoshua20213 on May 19, 2014 16:55:56 GMT -5
So ive been wondering if the A9 would help or hurt a stock 139qmb since its designed for the power bbk's put out. Scootzy created a post about it too. : I am what I am in my sig. except for the iridium plug. Got to tell you guys about that as well. Fist bought my scoot, 0-1000mi. orig. plug, changed to an NGK ran for 1500mi. and changed to iridium. 1500mi. later I had spark prob. SO.... I checked the plug only to find out the center dode was hanging off the side of the ceramic coting. I changed back to the NGK plug with 1500mi. on it. Rouhg about 7500mi on this NGK plug. Ok, Now about the A9. Is there any other cams for the stock 50cc??? I've seen on you tube, gy6 unspecified cc's, that he broke both vv springs inner and outter from just installing an A9 cam. Is this true on a stock app?  ? scrappy's mo says it is ok to use on stock app. what do you guys say? So I just thew it in to fully test it out, and lets just say i'm never taking it out. Better, smoother accel all the way around and mid to high rpm lift raises top speed. Stock took way too long to open the valve in order to have quicker more efficient ignition. Stock head, cylinder& piston. No installation problems or running problems. I used to recommend the A9 only for bbk's but now I recommend it for all 139qmb engines. I think the stock camshaft is a bottle neck or the "restrictor" everyones trying to find on their scooter. I've installed a bbk and gained ZERO actually lost top speed with the stock camshaft. Haven't played with gears due to the complicated pressing involved, but i'm sure that is a bottle neck too. Unless the engine is able to over rev itself to destruction I feel there are restrictions whether physical,air/fuel or electrical. I'd rather have capabilities and self control than limitations and irritation. Thanks for reading! |
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Post by jjoshua20213 on May 18, 2014 23:40:36 GMT -5
Most TaoTao ATM50 riders in Miami beach, I see riding with speeds averaging 40MPH, or greater. Most modern scoots do 40MPH GPS, without performance upgrades. I disagree. These scooters are made to run under 30mph in order to meet restrictions in many states. For example, in IL if you have <50CC AND it goes less than 30mph, you don't need a special license. The TAO TAO site lists the top speed as 30-35MPH. Why on earth would they do that if the scooter easily did 40MPH? I believe the reason many people do upgrade them is to still have a <50cc (at least for licensing purposes). Otherwise, why not just buy a higher cc? I mean, many of these Chinese scooters, you can get the 150cc version for like $100 or $200 more than the 50cc version. Why spend hundreds trying to get better performance when you can get much more performance stock than you will probably ever get with upgrading without any aggravation or risk? My tao tao cy50-a went 45 flat stock, just took awhile to get there. Wasn't great on hills. |
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Post by jjoshua20213 on May 17, 2014 20:05:40 GMT -5
Damn thats unfortunate. Good luck on your new purchase.
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Post by jjoshua20213 on May 16, 2014 20:58:07 GMT -5
Hey, I didn't see another thread on this so i'll make my own. What flaws did your scooter have from the factory. Might help me and others know what to check on our scoots and what too look for when buying a new chinese scooter. Mine is a 2013 Jonway 150cc, this is what i found so far (100 km on bike), bet i will find more - Stem nut dangerously loose
- brake rotor bolts hand tight about to fall off
- fuel line hose clamp on middle of hose instead of end
- CDI just dangling above engine from it's wires, not in it's mount
- rear brake non functional
- brake handles stick
- flaky headlight beam switch (some times headlight shuts off)
what about you?
1 or 2 minor flaws.. Okav those kids in china are probably exhausted and over worked. But you just plain need to take it back and get an other or go to another dealer.. Somethigns its like ok its irritating, it sounds like they didn't even care when they put it together. Imagine what other problems are lying to surface that you can't see. |
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Post by jjoshua20213 on May 16, 2014 20:53:19 GMT -5
Welds from outer space. (think spray painted popcorn) Rusted bearings on a scoot with TWO miles on the odometer!  Yea your scooter was new alright. Newly put back together. |
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Post by jjoshua20213 on May 16, 2014 19:49:47 GMT -5
Depends on the scooter. Every engine is different. Same applies to cars, trucks,ect.
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Post by jjoshua20213 on May 16, 2014 11:18:52 GMT -5
I put synthetic Castro 10w 40 oil in. i put in iridium spark in it. I put premium fuel. I have about 700 mile on it. I did inflate the tires...they were way low after winter. Oddly enough, they didn't produce any gains (well, so it seemed...with wind variances, etc....at hard to tell). I read about all these people saying they are getting 45-50mph on one of these scooters. Ultimately, it seems they 1) weight like 110 lb 2) have a "secret" 62cc. 3) have spent a ton on bbk, a lot of upgraded parts, etc. I'm one of them! My scoot does ~50MPH GPS verified (~60MPH on the speedo, which is not even there, because the speedo only indicates 'till 40MPH) 1- I'm 170 2- I don't know what I have (yet), but presume it's a regular 49cc (the manual says something like a 50.5cc) 3- Technically, I did not spend a cent on performance upgrades (windshield excluded, which can be debated if it actually causes speed gains or not). The scooter is very sensitive to wind and hills. With the least of them, I won't be able to get above 40. With strong winds, and uphill, I barely make 30MPH. I can only gain 45+ MPH after the engine has warmed up. It seems that doing a series of WOT accelerations, and engine braking, warms up the engine the fastest. But usually it takes a good 15-20 minutes, in 65-70 degrees weather, to get the engine hot enough. It also takes long stretches. If you are riding on a road with a lot of stop signs, you won't ever make 45MPH; as in my case, on a hot engine, it takes just under 10 blocks to get to top speed. I've also noted that BP Premium fuel is a lot different from other brands like chevron, shell, citgo, texaco, mobil, etc... For some reason I get more performance out of that fuel, not only with my scoots, but also with my car. On my Honda VT750 however, which is made to run on 87 oct fuel, I do not notice any performance difference WOT chops on an cold engine will quickly score your piston and cylinder walls. Why? Because metal expands unevenly. |
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Post by jjoshua20213 on May 16, 2014 11:16:01 GMT -5
I think that quoting a speed with wind pushing you or going downhill is silly. Of course, my scooter will go 50 if I had a 20mph wind perfectly pushing me. Has anyone drilled holes in the airbox or replaced the air filter? Some people claim good gains from that. I was personally happy to get the 4mph gain from the rollers. I am not sure if the performance variator will yield me much more beyond that. I live in Chicago in a very urban area. Street speeds limits are technically 30, but most people drive 35-40 when there isn't a lot of traffic. I am just trying to avoid being plowed over. Upper 30s mph would be sufficient. I've drilled holes; no help. Still getting around 33mph tops until wind comes into play. When people tell you they are going over 40mph on one of these things, be extremely skeptical and even if they prove it, understand that they are a rare, miraculous exception to the rule that binds 99.9% of us 50 owners. If you weight over a curtain amount a 50cc scooter will not go faster like you want it. More weight = the engine working harder. I put two batteries in a bookbag and I had less acel and top speed. Took the bag off and it went faster. If you want more power, simply buy it. |
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Post by jjoshua20213 on May 15, 2014 22:35:52 GMT -5
Did you just ask of failure is normal.
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Post by jjoshua20213 on May 14, 2014 15:39:52 GMT -5
Yea thats normal for the first go. Never happened to me changing engines or doing bbk's though, but others have reported otherwise. You should be fine. Sometimes the gaskets are imperfect and will have extra material than needed. In result the extra material gets inside. Also I've herd of metal shavings from the piston rings and cylinder breaking in. After the first oil change this should not occur again unless you have a problem.
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Post by jjoshua20213 on May 11, 2014 20:15:05 GMT -5
Thanks jjoshua, yes you also told me about weights being too heavy. Alleyoop told me also. I figured millsc had the right idea and we've gone through similar 49cc journeys (except me getting no bbk/clutch stuff) and I had read over and over that heavier weights would cost you low end but bring top end, which is what I need on these old country roads (mostly flat, as well). Thanks for all the great advice. I think my problem has been these cheap effin v-sliders; only on the factory one did they slip into place and stay (clip in). I'm now looking for a med-to-high quality variator w/6g sliders. You mean those3 things that go on the variator face place to guide of in and out of the variator? Just use the ones from the stock variator. Or try to flip ams switch them around. In had this problem too. If that face plate don't freely move in and out then that is a big part of the problem there. The 3 pieces don't clip on anything they should fit on very loosely and fall out if not held into place. |
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Post by jjoshua20213 on May 11, 2014 9:56:43 GMT -5
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Post by jjoshua20213 on May 11, 2014 9:46:14 GMT -5
Oops, it was me. WAYALL. I was losing patience. Was going gd 20mph today with the wind in my face. Effing loggerheads were waddling by going, "Daaaaaayam, brah. You might as well walk, son." I kept tweaking this and screwing that, and nothing was helping. Alleyoop, who is always wise but who I'm too stooopid to listen to sometimes said the 9g was just too much, but I had gone back to a 7g/9g slider mix and noticed no improvement--leaving me to think I might as well stick with the 9g for the hope of higher top end and , they were new. So I went with just the 3 9g sliders (equal to, theoretically, my mind said, 6 4.5g sliders). I just knew I would blow some shi8 up, but I got my speed back! Only problem is I barely had to touch the throttle to almost redline the Chinatac; got to 7k rpm like right now, but so did my acceleration. I could seriously ride a wheelie on this now. So, now comes the obvious question; I will go ahead and probably get a new set of 6 4.5g or 5g sliders, but can this 3-slider setup hold out for now? Or even indefinitely? If so, the 9g sliders i just wasted my cash on won't go to waste. Am I gonna destroy my scoot's motor at 7.5krpm? Pretty sure that was me that told you your weights were too heavy. I think your problem might be you heavy slider weights with and without a bbk my weights had to have been between 5.5g-6.6g or my top speed was effected. Tried 8 gram weights once and the top was effected. 3 weights were a bad idea. If it were stable i'm sure some would come manufactured like that. It allows the engine to rev out of band which wastes gas and could possibly over heats the engine. Also causes the variator to rotate unbalanced. 7.5-8k sounds normal for full throttle. depending on your weight. From what you described you have a variator situation. Many scooters never go through 1 but your on your third one. The variator should never get hot enough to melt the fan, be glade your belt didn't go. Running 3 weights in the variator didn't cause this. Ive ran with 3 before. I would just put back in the stock rollers until you get new one unless they are really worn and won't gain any speed at all. |
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Post by jjoshua20213 on May 4, 2014 16:50:32 GMT -5
Where in va do you live?
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Post by jjoshua20213 on May 4, 2014 16:45:01 GMT -5
For 50 bucks you can upgrade the piston to 50mm. The stock is 39mm, and its easy enough to do it yourself. That will give you a big accel and top end advance. You would have to buy an A9 cam shaft to unlock your top speed. It runs around 30 bucks
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I am what I am in my sig. except for the iridium plug. Got to tell you guys about that as well.
