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Post by aeroxbud on Jul 3, 2023 15:00:20 GMT -5
Walk away and start fresh another day. We have all been there. When tired and frustrated you make mistakes.
Double check the timing just to make sure it is correct.
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Post by classacted on Jul 3, 2023 16:07:47 GMT -5
hey Kevino,
I can't even see the spark, and I have never been able to, with this gy6, and it's the second engine. I've had numerous japanese mopeds and I have always been able to see the spark. I keep a slew of parts that are known good. it's always something new with these chinese scooters. I think you have to enjoy the hobby to begin with.
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kevino
Scoot Enthusiast
https://www.youtube.com/watch?v=04dSGwAssRA
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Post by kevino on Jul 3, 2023 18:51:08 GMT -5
Thanks for the advice. I wanted to a compression test but I don't have the right adaptor. Since the plug was out I squirted a few mls of gas into the chamber, replaced the spark plug and tried starting the engine. It fired up instantly and ran til the gas was gone. I did the test twice more and each time the engine fired instantly and ran til the gas was gone. That clue suggests to me the problem might be the carb. Regardless, I'm still taking it to the dealer on Wednesday. If the problem is something so simple any idiot could have found it, it wouldn't be the first time I've done this. Not even the 10th time.
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Post by classacted on Jul 3, 2023 20:02:36 GMT -5
does your scoot have the gas tank above the carb (gravity feed)? does it also have the diaphram vacuum operated petcock? I got rid of the vacuum petcock and put an inline valve instead. the petcock gave me problems right from the start. if your tank is under the floor than you are at the mercy of the pulse fuel pump that I've read so much bad stuff about. I don't like this 'it could be this', 'it could be that', 'it could be that'. I like to say 'it has to be this'. it's a good feeling to say that I haven't had a fuel delivery problem in well over six months.
that was good diagnostics. I would definitely be targeting (lack of) fuel. I've made it clear that I like to have 'known good' parts available at all times. what you pay the dealer (unless it's under warranty) you could buy three new carbs.
definitely get that compression gauge working. don't wait to use it. when your scoot is running good do a test. I do the valve adjustment with the gauge still attached and when I'm done the compression is at least equal to when I started. never less. don't forget when you do the compression test to open the butterfly. look inside and make sure the passage is clear. don't try to compress vacuum. haha.
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Post by aeroxbud on Jul 4, 2023 3:33:43 GMT -5
Is the vacuum pipe connected to the carb? It wouldn't be the first time I've forgotten to connect it either. 🙈
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Post by GrumpyUnk on Jul 4, 2023 9:56:02 GMT -5
If you want to test fuel supply problem vs carb problem, you can get a good length of rubberish line that will fit on the fuel inlet on the carb. It will be the line that goes back to the fuel filter, on the 'left' side of the carb near the black plastic byvalve.
Any way, get a good long line, connect to the inlet, and fill it with fuel. Have a broom handle or have some one hold the line up so it will not pour out the fuel, and will gravity feed.
Attempt to start. If it starts and runs, using the full fuel line as its 'gas tank', then you can be pretty sure that the fuel supply is a problem area. A sticky petcock,(you can supply vacuum to check flow), or an outlet filter tube that has gotten blocked with debris(remove the outlet from the bottom of the tank and inspect) that collects when flow moves things. Grass clippings and the like are common for some reason.
Any way, if the fuel line as tank allows the engine to run, your carb & spark are functional. A sticky float valve can also block fuel flow, so if it still does not run, removing the float bowl & float & needle valve may be a good way to go.
I get so much back pain working on these that I have a HF stool I can sit on while noodling around. If I bend over for more than a few minutes, it is torture. Get a stool/chair/? or sit onthe ground. A thick chunk of rug is very handy in the garage, for your butt and for knees if you need to kneel.
The shop will likely charge a 'Dx' - diagnosis - fee. Some just fix it at 1 hour of shop time, and that may or may NOT be credited towards repair. Be careful about expected charges as most shops end up with a bunch of machines where the customer thought the repair would be....less.... and it comes in at a higher than expected number. It is easy to end up with a bill that is more than the retail value...
I fix my own.
tom
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kevino
Scoot Enthusiast
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Posts: 358
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Post by kevino on Jul 4, 2023 10:53:01 GMT -5
Well damn, it worked.
I pulled the tube and clamp off and snipped the last 10mm of tube off, added the clamp and jammed it back on. And if fired. It won't idle and because the throttle cable bracket is frozen I can't manually work the carb but the main problem is solved.
I guess put the muffler back on now.
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Post by classacted on Jul 4, 2023 11:22:42 GMT -5
are you saying the hose coming from the gas tank, where it's connected to the carb? you had BLOCKAGE right there? that's one that has never happened to me, and I'm old.
was it leaking there and you didn't notice it? that I have had happen. that reminds me that it's time to replace the hose on my own scoot.
GREAT JOB! you don't need to have the dealer fix stuff for you.
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kevino
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Post by kevino on Jul 4, 2023 12:21:49 GMT -5
are you saying the hose coming from the gas tank, where it's connected to the carb? you had BLOCKAGE right there? that's one that has never happened to me, and I'm old. was it leaking there and you didn't notice it? that I have had happen. that reminds me that it's time to replace the hose on my own scoot. GREAT JOB! you don't need to have the dealer fix stuff for you. No, the hose had a long crack at the end that prevented suction for pulling gas from the tank. I snipped off the ragged end and put the hose back on and it started. |
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Post by classacted on Jul 4, 2023 13:17:17 GMT -5
you must have a fuel pump and the tank is under foot.
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pili
Scoot Enthusiast
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Post by pili on Jul 4, 2023 14:08:39 GMT -5
Is the vacuum pipe connected to the carb? It wouldn't be the first time I've forgotten to connect it either. 🙈 Looks like you nailed it! |
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kevino
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https://www.youtube.com/watch?v=04dSGwAssRA
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Post by kevino on Jul 5, 2023 9:52:53 GMT -5
 So I've decided there is no "F" way to install a scooter muffler. If I first mate the front two 10m nuts with the copper gasket and muffler attachment then there's no way to mate the two rear 12mm bolts to the muffler attachment. If I put the two 10mm bolts in first then there's no way to fit the two 12mm nuts at the front. and the two metal spacers don't fit anywhere. I looked for videos but didn't find any that helped. |
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Post by GrumpyUnk on Jul 5, 2023 10:54:10 GMT -5
When you mount the exhaust, I would suggest connecting the pipe to the cylinder head first, so you can mumble around holding the muffler to adjust how the down pipe fits against the gasket. Get it good and flat, tighten the long nuts til they seat, and you should be good. You can do a final tighten on the long nuts if you are sure the seal will be good and the pipe is flat against the head outlet.
Once that is tight, get some blocks, a lever, a floor jack, whatever you like, and put it under the muffler. Crank that baby up until the two holes line up on the metal bracket that bolts to the block. You may have to do some bending with one installed and run in almost all the way to get the second to line up.
START BY HAND!!! repeating, do not use a wrench until you have the bolts run in at least 3-4 turns. You can mangle the muffler position to get the holes lined up and the down pipe will still be attached and be quiet when done.
One bolt is longer than the other, and there is/are some 'slugs' used to space from the bracket to the engine block. Put is close by hand and note which seems to need the spacer slug. Just take your time, and use the jack/blocks to hold the weight of the muffler AND the possible tension you need to use to get it to fit properly.
They fit once, so should fit again...
tom
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kevino
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Post by kevino on Jul 5, 2023 11:49:24 GMT -5
 Thanks. I started at the other end, trying to mate the two long 12mm bolts to the frame. But I'm still doing something wrong. This photo may show the two spacers. I doubt they are meant to go on one 12mm bolt. Also, the big gasket has no groove to help it stay in place while tightening those two long nuts. |
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