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Post by classacted on Jul 10, 2023 18:39:24 GMT -6
btw, my vehicle is similar and your vehicle cannot crank in the x position. put that switch to 'on' and see if you have spark. did you buy this vehicle new? it could be 'altered' so it can still crank in x. I've considered doing this with my gy6. those switches are not high quality IMO.
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Post by classacted on Jul 10, 2023 18:31:59 GMT -6
hello gregmp,
I've worked on japanese mopeds for decades and it's always very easy to see the spark. with my gy6 150, I have to make an effort to create a 'dark room' to see the spark, or wait until night. there's no issue with the vehicle running. it runs great. it's just incredibly hard to see the spark. I just want to make sure this is not the case with you as well.
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Post by classacted on Jul 4, 2023 18:21:31 GMT -6
are you talking about the STARTER solenoid?
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Post by classacted on Jul 3, 2023 19:22:11 GMT -6
so many people out there have that same problem creeping up on them and don't even know it. sediment is a major factor in all of these fuel pumps that go bad. I've had a moped hobby for years and a couple of times a year I would have to siphon the gas out, strain it with a tee shirt and put it back in. it took only a few minutes and I got ALOT of garbage out every time. it saves alot of agony. good for you! RIDE
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Post by classacted on Jul 1, 2023 14:09:04 GMT -6
check the spark when it's on the stand and test it when it's off the stand you want to be sure if it's a spark issue
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Post by classacted on Jul 1, 2023 14:05:00 GMT -6
I definitely recommend having spare ignition parts. with my bike, it's quicker to swap a part (I would recommend you to swap the coil NOW if you have one, I suspect the spark plug cap inners are moving around, or you're losing contact along the way, also, those on the back of the coil come loose), than it is to actually diagnose with a tester. also, check the plug while you're at it, although this doesn't sound like a plug failure. certain wires from the stator, cdi, and coil are suspect. I also suspect a ridiculous hot wire somewhere in the bike is suddenly grounding out due to movement. if you still have all of the faring on the bike, you may need to remove it to fix this.
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Post by classacted on Jul 1, 2023 13:44:40 GMT -6
my good man, forgive me, but you are not doing the basics as far as I can see. checking for spark. testing compression with a GAUGE. making ABSOLUTELY SURE you have fuel getting to the carb. making sure air is flowing IN and OUT of the engine. I don't see you stating any of this in your post. if you have one of those fuel pump bikes, my hat's off to you. I've heard too much negative feedback about that system. I suspect that system to be the problem first. the gas tank is under the foot floor and gas has to travel uphill. there's nothing wrong with having an ugly vehicle. the prettier your bike is the more likely it is to be stolen. that faring gets in the way as well. when they build the bike that is one of their objectives. to make the vehicle hard to work on. that's why you see people selling them so quickly as soon as the first thing goes wrong.
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Post by classacted on Jun 26, 2023 12:50:59 GMT -6
as soon as the engine stops, check for spark. you may need someone to hold the bike. you may have a switch connected to the stand, if I am understanding you correctly.
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Post by classacted on Jun 26, 2023 12:41:58 GMT -6
when that happens, pull off the gas cap right away. if you hear suction, then it starts immediately, you are developing a fuel vacuum that is preventing enough fuel from getting to the carb. obviously check the fuel delivery at the carb inlet. I used to have to siphon all the gas (and debris) and strain it and put it back in about every six months when I had old japanese mopeds. they don't always give you clean gas at the gas station.
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150cc
by: classacted - Jun 26, 2023 12:35:25 GMT -6
Post by classacted on Jun 26, 2023 12:35:25 GMT -6
when that happens, pull off the gas cap right away. if you hear suction, then it starts immediately, you are developing a fuel vacuum that is preventing enough fuel from getting to the carb. this may also be an overheating issue with the passage of time allowing the engine to cool off. those ideas are off the top of my head.
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Post by classacted on Jun 16, 2023 17:20:24 GMT -6
I use a good ol compression tester when I adjust the valves. it's tedious, but guaranteed. when I'm done the compression can not be lower than when I started. it can only be equal or better. when I start I do a compression test and every time I do an adjustment I put the head back on and test again. it's only four 8mm bolts, and to be certain I have the valves at the best possible adjustment is worth it IMO. putting the head back on ensures that the oil goes where it has to go. right now my compression is at 137 psi, which is what it was when it was new.
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150cc
by: classacted - Jun 16, 2023 17:06:31 GMT -6
Post by classacted on Jun 16, 2023 17:06:31 GMT -6
if I ever buy another, the placement of the gas tank is going to be a major consideration. gravity reliably delivers the fuel to the carb, and I won't use a vacuum petcock either. that petcock is supposed to save you in case of an accident. it's supposed to stop fuel from going everywhere when you dump the bike, but I think it's more likely to cause an accident when it fails. the time I used one, it failed in five days. it's been almost a year since the bike died on the road and it was because of that petcock.
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150cc
by: classacted - Jun 12, 2023 19:22:11 GMT -6
Post by classacted on Jun 12, 2023 19:22:11 GMT -6
bummer. I am looking at a BMS heritage manual and it shows the gas tank under the seat, just like my tao tao, but can also be under the foot platform. I know some bikes like ice bear mad dog require a fuel pump. I hate that design. these things are supposed to be practical. from what I have read, kymco is similar with a vacuum pulse fuel pump.
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GY6 180cc
by: classacted - Jun 11, 2023 20:50:03 GMT -6
Post by classacted on Jun 11, 2023 20:50:03 GMT -6
I hope the original poster solved his problem. I don't think he/she is going to reply.
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150cc
by: classacted - Jun 11, 2023 20:44:22 GMT -6
Post by classacted on Jun 11, 2023 20:44:22 GMT -6
as soon as I got a manual shutoff valve, I ditched that vacuum shutoff thing. it took about a week. haven't looked back. the same thing goes for that EGR system. the chinese know what they are doing when they make the vehicle so hard to fix. most people just get rid of the vehicle and buy another one and that's what they are hoping for. don't forget to have an inline filter.
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