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Post by Silar on Apr 26, 2015 21:48:31 GMT -5
If you have a way to bypass the fuel petcock and temporarily run from the gas tank to the carb, try that. Your vacuum fuel valve may be leaking gas into the vacuum hose which is connected directly to the intake and could be creating an overly rich condition not allowing you to start. Ask me how I know..
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Post by Silar on Apr 26, 2015 21:41:25 GMT -5
Glad you got it going, and pretty well by the looks of it. Me too! I've still got some air/fuel tuning to do, but so far so good!
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Post by Silar on Apr 26, 2015 19:10:56 GMT -5
Dont remove it. It will cause you engine to go from side to side. The tubing is there to prevent that.
Actually, by the way it's mounted, there is no way that the engine could go side to side.
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Post by Silar on Apr 26, 2015 18:18:10 GMT -5
Its called a swing arm. You could buy a new one but... if you're cheap take the swing arm off, have the tube welded in place. Slap it all back on your scoot. If you're cheaper you can use the washer trick that Fox suggested. And if you're even cheaper then that, stuff coton in your ears. Or... If you're the cheapest of cheap.. Just remove it.. I'll probably look at getting a new swing arm later, but for now, I'm not going to worry about it if it's not causing any excess vibration or safety concerns..
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Post by Silar on Apr 26, 2015 17:50:14 GMT -5
Got the wiring harness done. Yay!
Very short video of my scooter rebuild after putting the BBK, A9 cam, gates belt, 8 gram rollers, performance CDI, performance ignition coil and NGK iridium plug in. It's still in shambles, but now I can concentrate on tuning and the body! YAY!
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Post by Silar on Apr 26, 2015 17:47:38 GMT -5
Had my son-in-law jump on the scooter and ride it down the road so I can show you guys. I should of had him film me. I think he was a bit hesitant to go WOT so he didn't. I got it up to 44 mph. Looks like it maxes RPM at right around 7.k5 to 8k RPM at WOT with the 8 gram rollers. I may need to go down to 7 gram sliders...
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Post by Silar on Apr 26, 2015 17:43:42 GMT -5
Did you buy this scooter new? The motor mount aint suppose to be that way. That tube should be part of the bracket, and not be like that. If the bracket is between those two mounting holes, its suppose to be in 1 piece with bushing preventing vibration. I bought it used. What is the piece called so I can get a new one? I've just removed it for now to prevent it from vibrating. I don't plan on doing any riding in the rain or on dirt roads or anything like that..
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Post by Silar on Apr 26, 2015 16:57:53 GMT -5
This part in the picture is some kind of cylinder tube like thing that is over the bolt for the motor mount, but it's bigger than the bolt so it's loose and rattles around like crazy on there, especially at certain RPM's.. Can I just remove this tube, or is there supposed to me some kind of rubber insulator that goes in between the bolt and the tube? If there is, what is it called? I'd like to order one or remove this thing so I don't have to hear it buzzing and rattling...
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Post by Silar on Apr 26, 2015 15:24:11 GMT -5
Wow thats the first time i ever heard 139qmb being refered to as a jet engine glad to hear ya figured it out. Thanks Pimp! Compared to what it was doing.. Hell yes a jet engine!
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Post by Silar on Apr 26, 2015 15:22:01 GMT -5
And another WOW! I bypassed the fuel pump/diaphragm and ran line directly from the tank to the carb so I can tune it.
It's a bit weird, but I'm running #90 main jets, have the needle with the clip set to the leanest, and have the snorkel removed from the airbox. If I don't remove the snorkel, I get hesitation while riding. With off, I get great throttle response, and can just about smoke the tires. Seems like I may need to either go down a jet size or so, or go ahead and remove the airbox and get an aftermarket air filter. Almost seems like it's still a bit rich.. weird..
I did have to change out the 5 gram sliders. Those were too light and at WOT I was at 10k rpm while trying to get a top speed. I changed those out to the 8 gram rollers that came with the BBK and it's much much better. Running at around 8k rpm while accelerating WOT.
I rode it up my street and with the 8 gram rollers in, I reached 40 mph pretty darn quick, and that was going up a slight hill. I actually like the way the 8 gram rollers feel vs the 5 gram sliders. Maybe I'm not as fat as I thought I was. Time to buy some 8 gram sliders now!
I did notice that it sounds like I may need to do another valve adjustment. Now that the engine is good and warmed up, the valves are ticking quite a bit more. I set both of them to .003 when I put the BBK in..
I'll see if I can get my wife to take a video of me riding to show you guys. I'm just so excited I got this thing going.. and going strong!
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Post by Silar on Apr 26, 2015 12:58:06 GMT -5
I posted about this in the troubleshooting section, but thought I would mention it here also as it may help people that may be having the same issue.
I've been having a bad overly rich problem on my scooter and couldn't figure it out so I started throwing parts at it like crazy figuring something would fix it. I've installed a BBK, A9 cam, performance CDI, coil and wire, gates belt, sliders, different main jets and diaphragm needle adjustments, etc.. etc.. etc.. Also installed some new clear fuel and vacuum line.
All of that and still had the exact same problem. It would only go to about 10 mph... Then I noticed something... I noticed that the clear vacuum line that is attached to the fuel pump was somehow sucking fuel into the intake directly.
If you watch the video, the vacuum line is running from top to bottom, and the fuel line is running from left to right. If you look at the vacuum line right under where the fuel line is, you'll see something pulsing through the line. Guess what.. That's gas!
So like me, then you will have to replace your fuel pump. Of course I now highly recommend the clear polyurethane lines. Thankfully I bought some and installed it or I'd still be pulling all my hair out still thinking it was a carb issue, or rings or seals bad.
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Post by Silar on Apr 26, 2015 12:08:53 GMT -5
Wow.. Just Wow.. I wish I had another fuel pump on hand.
I let it run a bit with the vacuum line on and took it down the road. Didn't even get over 10 mph. Same exact problem and the reason why I started this thread. My little 8 year old neighbor helper said he could run faster than I was going. I told him he could probably walk faster.
I then took the vacuum line out and capped the intake port and took it down the road. HOLY MOTHER OF GOD!!! It felt like someone had put a jet engine in the scooter!!!! I was up to about 30 mph in what I thought was about 100 ft of distance, then the motor died cause the vacuum wasn't allowing gas to enter the carb. I connected the vacuum line back up and got it started and rode back to the house going about 5-10 mph.
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Post by Silar on Apr 26, 2015 11:00:42 GMT -5
Gotta love clear fuel lines! I think I found the source of my problem and it's probably been the problem the whole time.
I recently replaced my fuel and vacuum lines with clear blue lines and just now noticed this!
The vacuum line running from the diaphragm pump to the intake port is the vertical line from top to bottom. If you look at the line right below the fuel line that goes left to right, you'll see what appears to be fuel being sucked into the intake. It's ever so slight, but apparently enough to cause serious bogging issues, especially when I blip the throttle.
As a test, I disconnected the vacuum line from the intake and put a cap on that port. It fired right up, and now when I blip the throttle to WOT she revs straight up fast and doesn't bog out at all.
So looks like that was my problem from the start. I never realized it since I had the wonderful black OEM chinese crap vacuum line on it.
Time to order a new pump!
Anyone that is experiencing bogging, hesitation, overly rich conditions that you just can't seem to figure out, I highly recommend buying some clear fuel line so you can see what is going on...
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Post by Silar on Apr 26, 2015 9:38:07 GMT -5
Doesn't look far enough off to be a tooth off to me. You could try and find out if it will get closer, but I kinda doubt it. Forget RPM and focus on throttle position if you suspect it's the carb. You should find that a certain throttle position is where it tries to die or starts acting up if it's the carb. Find a simple way to mark your throttle housing and grip so you can see 1/4 1/2 3/4 and WOT easily. Just for temp use cutting thin little stickers would work without leaving any permanent marks. I'll try that today. Getting ready to watch your carb and cvt tuning video again. Some other things I forgot to mention was that I have my diaphragm needle c-clip set to center position, and I have the A9 cam installed. I really appreciate the help from you and the others. I've learned so much about these scooters thanks to you guys! It's a sunny day today with no rain so I'm going to try to take this scooter down the road also and see how it does. It's been a little colder than normal, but today is supposed to be in the 60's..
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Post by Silar on Apr 26, 2015 1:05:57 GMT -5
I decided to go ahead and double check my timing and get some pics. I may be alright on timing. I thought I might have been a tooth off, but this is actually pretty close. Still wondering why it just dies from giving it WOT fast....
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