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Post by lonewolfncubs on Mar 28, 2015 23:36:06 GMT -5
Can anyone tell me if I am suppose to attach a hose to this tube, whenever the scooter runs, I feel air sucking into the carb, I feel a vaccume line is suppose to be there but I don't see where the other side of the line should go to....
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Post by Fox on Mar 28, 2015 23:50:50 GMT -5
Usually there is a vacuum operated petcock on these that opens when the engine is running via a vacuum line. Did you install a manual shutoff?
Anyway, you can plug that port using a short piece of tubing with a screw shoved in one end.
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Post by Sitticuss on Mar 29, 2015 3:10:57 GMT -5
I use the PWC oil myself.
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Post by lonewolfncubs on Mar 30, 2015 12:49:41 GMT -5
Fox There is a picture I already posted in this thread that showed the petcock
I'm i to attach a hose to the bottom port of the petcock and attach the other side of the hose to the top port of the carb?
Right not I'm draining the tank of fuel and oil so I can check and clean the petcock as well as the inside of the tank which I should've done in the first place. I am wondering if that vacuum is the reason why it's not starting as it suppose to, I am going to remove the carb as well and reclean the interior and make sure all the holes are clear
Also going to jb weld the right side plastic together and let that cure overnight
I am going to try to find an ngk plug cause advance auto did not have ngk and I had to purchase cheap autolite.
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Post by 90GTVert on Mar 30, 2015 13:52:03 GMT -5
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Post by Florida Antique on Mar 30, 2015 14:56:30 GMT -5
Lonewolfncubs, That nipple that you took a picture of is the vacuum port for the petcock. You can test the petcock by putting vacuum on that line and see if gas flows out the other tube. I would tell you that you can suck on the tube to do that but I did it one time with a bad petcock and got a mouthful of gas. That will definitely keep it from starting as there would be no gas going to the carburetor. I also wanted to let you know that any 10w30 oil is fine for the chaindrive but don't do like I did and fill it all the way to the top. If you do that, the scooter will only go 20 mph. There is a bolt in the side of the drive cover in the middle and another one on the bottom. The bottom is to drain the old oil and the middle is the oil level bolt. Unscrew it and fill it till the oil starts coming out and then it's full. Do not fill it to the top where the fill plug is. There are 2 screws in the side of the cover. I think the lower one is the fill level. If it just screws into the cover and not anything behind it, that's the one.
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Post by Fox on Mar 30, 2015 17:28:00 GMT -5
Yes that port is supposed to have a vac line running to the petcock.
Antique is right about the oil level. There's two screws in the center of the chain cover. The lower screw is the fill level hole. You remove that screw and fill till it starts coming out the hole and put the screw in.
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Post by lonewolfncubs on Mar 31, 2015 23:09:58 GMT -5
Wow I'm starting to get frustrated, I tries starting this scooter for a while and no luck I suffocated the carb (fully cleaned carb I might add) it refuses to turn on, tomorrow, I'm going to install a direct line into the carb from petcock (no fuel filter) and remove new exhaust and see if that will make it turn over, I have no progress with it attempting to start with the airbox installed, it only sounds like it wants to start if I end up removing the snorkel tube and suffocate the carb but even with that it won't turn over I bough ngk and gapped it at .070 manual said between .060 and .080, tank is clean and have fresh gas and PWC 2 stroke oil, installed a new fuel filter
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Post by 90GTVert on Apr 1, 2015 9:20:17 GMT -5
That sounds like a lot of gap if that's inches. Most small engines are more like 0.024-0.028" or 0.6-0.7mm.
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Post by niz76 on Apr 1, 2015 9:27:17 GMT -5
That's what I was thinking. I gap mine to .028"....
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Post by lonewolfncubs on Apr 1, 2015 22:17:17 GMT -5
Wow thanks guys, I thought the spark plug gap seemed too wide, I did regap plug but results were the same, i feel I'm going to kill the starter on how many times I attempted to start this scooter, I cover the carb while starting, nothing, I attempted to start with and without the vacuum line, nothing, I'm wondering if you guys ever had a coil produce spark but still bad? I'm lost in confusion
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Post by lonewolfncubs on Apr 2, 2015 0:48:58 GMT -5
I got it to start, but I'm really talking about a good 3-4 minutes of spinning that starter and giving it a tad of throttle before it turns on, and that's with the vacuum nipple on the carb open, now it stood on and I was able to rev the engine a few times and it did not turn off but the minute I put my finger over the vacuum, it turned off immediately and of course trying to start it up was just the same trouble as before, at that point both the scoot battery and my backup truck battery had both was too low so I'll call it a night, let both batteries charge then in the morning I'm back to trying again
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Post by Fox on Apr 2, 2015 1:22:01 GMT -5
If you run the engine with that vacuum line disconnected from the petcock then the carb bowl will run dry and the engine will die. Then you have to crank, crank, crank to fill it back up with the vacuum line attached so do yourself a favor and leave that vacuum line attached where it goes so the carb is always getting gas. I'm sure you have done it already but in case you haven't remove the fuel line from the carb and suck on the vacuum line like a straw. Fuel should flow freely from the fuel line as long as you are applying vacuum to the petcock and stop the instant you stop.
How many turns out is the mixture screw? That's the screw with the paint mark on it.
Also, turn the idle speed screw way in like two or three turns so you don't have to twist the throttle to keep it running. Then once you get it to run constant, turn the idle speed screw down as low as you can but not so low the engine dies, then play with the mixture screw.
I suspect that maybe since you had to remove the top end after the initial install to turn the piston around that you may have an air leak at the head or the base gasket or you may have an air leak at the intake manifold. Did you use anything like silicone or any type of sealant on any of those areas?
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Post by runningbuck on Apr 2, 2015 8:41:55 GMT -5
not to counter what fox is saying but if you have to leave vacuum lines off to get it to run sounds like it's running too rich and not enough air i would check your idol screw and do a quick on engine fuel bowl check( simple check attach a clear hose to the drain port and run it up to the top of carb open the drain plug and make sure the fuel is about 1 to 3 mm below the bowl seam if any higher or lower you need to readjust the float)
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Post by lonewolfncubs on Apr 2, 2015 21:48:44 GMT -5
Ok so I left the vacuum line in and tried starting the scoot, it did start but like I said before, I'm seriously talking about leaving my thumb on the start button for about 3 to 4 minutes and within those minutes it will progress more and more sounding like it wants to start until it finally starts. Once it starts it runs fine, in fact we took it around the neighborhood a few times and it runs like it should but once it turns off, it's back to attempting to start it again.
Now let me clarify:
the snorkel is removed from the airbox cause there is no sounding progress while it's trying to start
I do suffocate the carb cause it does sound like it's trying to start more and more when I do
Once it starts, it idles high for a few seconds then drops rpm like any other vehicle I have worked on so to me that sounds normal and once it's running I don't have to give it throttle to keep it on it just stays on and I was able to ride and slow down and stop and go and during all that it won't shut off until I turn it off, but like I said, after I try to turn it on again, I have to start everything over again to try to get it started again and this starting procedure drains both the scooters battery and my booster battery so now my fight is with the initial starting.
I do not have any silicone or sealant on the gasket, I didn't think I needed it due to new gaskets that came with the piston and head kit.
I do not know how to adjust the float
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