Clinician
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Post by classacted on Aug 10, 2023 11:19:24 GMT -6
I'm sure you checked those obvious things you mentioned. remember, coolant is supposed to be changed periodically and blockage can take place if it isn't.
timing, carbon buildup and rpm's are other possible causes to be considered.
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Post by classacted on Aug 8, 2023 16:58:41 GMT -6
my bike is a tao tao 150cc. I have two engines. the first had the egr pipe on the valve cover, the second does not. the second engine has been running almost perfect for about 1400 miles with no egr. I think you can cap off and totally disregard the egr system and it will run as well, if not better. my first two guesses for you to investigate are timing and compression. you likely had fuel and spark and still do, but if you check compression (with a gauge) and timing and they are fine, do a quick fuel check and spark check. keep it basic.
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Clinician
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Post by classacted on Aug 7, 2023 10:47:19 GMT -6
I really like the fact that MY gy6, and probably yours too, can work without the transmission cover. the cover is not needed.
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Post by classacted on Aug 1, 2023 8:06:52 GMT -6
thanks for coming back with the answer. statistics show one third of vehicles on the road have ground issues. ignition problems can spread. a bad spark plug harms the coil. you can't have too many grounds, but you can have not enough, as you've seen.
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Clinician
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Post by classacted on Jul 13, 2023 8:21:30 GMT -6
hello irishace,
you won't gain in both takeoff and top speed. you will gain one and lose the other depending on your choice. there's plenty of videos on youtube that cover this. myself, I don't like having extra parts to keep track of. when it's time to replace something, I will use new stock replacements.
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Clinician
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Post by classacted on Jul 12, 2023 11:55:47 GMT -6
it looks like the seal got stuck on the crankshaft. anyone who had success doing that just got lucky IMO. there might be a special tool to do that that pushes the inner and outer circles. just pushing against the outer circle is wishful thinking.
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Clinician
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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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Clinician
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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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