KymcoForum.com
Scooters - 125 to 300 => People 150 => Topic started by: JayPortland on September 28, 2020, 07:58:20 PM
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Hey guys.
I started another thread earlier thinking it was my Kill Switch but evidently the thread has been locked so I'll just start another thread.
Someone suggested I take a look at my battery. Its new, its fully charged and yes it is turning the engine. Below you can see my multimeter test results on the battery.
A couple of other things to make note of. I used a sparkplug tester to see if I was getting spark. Here is the video showing I'm getting spark. https://www.youtube.com/watch?v=3hlIhbiv1O8&t=3s (https://www.youtube.com/watch?v=3hlIhbiv1O8&t=3s)
New oil
New spark plug gapped at 0.7mm
New battery
New carburetor
All fuses are good and connected well
New gas (yesterday)
Verified Petcock is fully functional
Trying to adjust both the idle throttle cable and the idle gas screw next. Still not turning on.
(https://lh3.googleusercontent.com/6zvO3bVHkj9-SKnCY3wolNYg659mRZY0M-Hggohsq6YQO0LnrJpQayDpP_bW_AJ5pf_hzycXFzMc3E_6taOj8IZxaA854fozr_ufWv2TgNBjQUTCWTZxnjzrDCS6nlN2Z_fQocSTijc2nvNuSjMSPtKmA5nHwY8633gFkwmaX6o1g1SgLKsLsb80bxR93qb4xzlpCrgitxzPwoQv3aXLZnkSAzBFLfoczuKWyRQ4MQhqKnMnq3nDmDZ1tq2C8kRaqHBKUiSXA28HNZOO0koHvf1Zd2YGl0A3DKKIyXHpjoktrRq7TzTGONjHvQWZsz0F08MubqEh7hFbn9zIQ_hzSk-SPggS5oJ8gd5qMwwK5f0VgJFUuIllulFyCNHQ9dvFi7TDwBeHcGRzFY1XvZSKG1pjLv3WuTZTP88PQrAdwoSm-IgfgthLZqp1RkLiU58O9fdfBAIT0BY0AJrwb5VJxcRYffUswAHJOSjHwQGuXF5XrLIXpJNWkic2RxvVavqqSpLhHJExSTvKIIr281og3GVNt0-p68KWaBnAooMlnVvikzz4Ky9we9BO9Rcw-vCBjzwo5xWOi5LCWYEzxGV_7JSBZ0ADstMnJRi7EYz60suZDkAR8kAH7HgDcf3q4RM4CUWdUls2aJ3wDjaBM3JO6QAUxoJD-q7dA3hpIP3Sxqwi81YRrU63xbcPdDbO5Ww=w800-h600-no?authuser=0)
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basic troubleshooting video from Scooter 911...
https://youtu.be/xW5y7a7CB1c
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Sounds like you have no compression. Troubleshoot that and if it was running before leave the idle adjustments for after it actually starts.
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basic troubleshooting video from Scooter 911...
https://youtu.be/xW5y7a7CB1c (https://youtu.be/xW5y7a7CB1c)
Hahaha. I remember watching that video with silly Cletus. Yup. I'll watch it again for the hell of it.
(https://lh3.googleusercontent.com/qOs7dponogi1EGLL-mNAD0Dlx1hvYidGZjdbncpKbbOUEfxFeUXJvatWUiwbxJrA85Hc72YCQ0FDXyynNlQ_jtKPT3-YOmKvI4qx318siPF7TuwK-705HVC8gYvkAa_Masl4dGGVJVn28ViFqmLoZ-VnDAkJeP3K6oXjT0fQmVxeS1t9eIrCUpO8ajd1rh7cB5eJGWkGfQFbY_gtK6uDBtP4nC9Hp_YvDwtXfpFUuRlRr5bjzze8wBKntk8EGgyrEfpt6M1oA1fccJGUswKWMneDEPmqpx-SnmohKTlE0-5EPvqVmUw9lFbdY6VqkBgnsOkli6WkibSG0ox-neX1_2pp7SVkiLIzduRGCu3ffhxClO05VvCKFM-gpwkU91wj45hIkLJ3Qw5F4QFlB51HqSG2LhlaCcbcRWK-_iJIXZskLKgdcJTXava7GJ60hEOmQJRvFo_By2lsfnRTAI2kcq416w_AE3M7S95AkyH29iwrMmxsXoeAjjK7D22Fs_h6adbbmVvIDLA599EsWGeTAxlTwTvNz3DDr8FBSJtUwIpolaicGKQUVLhzCpor3N1cAO_rsxQJa6xiaZCcNBkvHBihLp9ikos0e7nebeTKYACGTJkUk1EkV1HXO3azfGD8rfp52qdN-HpzIl0Sf5uaIYps2gmLabh8gmTFCOgPr1ir2HEmIAj4Q-4daKWm9m0=w200-h155-no?authuser=0)
3 basis questions.
Question 1. Does your engine Crank?
Yes.
I just went outside to check to see if it was cranking and made a quick video. https://www.youtube.com/watch?v=ep_iflQjTxA (https://www.youtube.com/watch?v=ep_iflQjTxA)
Question 2. Is it getting fuel?
Yes.
New carburetor was installed. Also, tank was drained and new gas was put in the tank yesterday.
Question 3. Does the Scooter have spark?
Yes.
New NGK CR7HSA spark plug was installed about 2 weeks ago and it has been running fine. Yesterday I also tested the spark plug. Here is the video showing I'm getting spark. https://www.youtube.com/watch?v=3hlIhbiv1O8&t=3s (https://www.youtube.com/watch?v=3hlIhbiv1O8&t=3s)
I just went out there and tested the spark plug again, here is the resulting video. https://www.youtube.com/watch?v=KZTjjrWXWuA (https://www.youtube.com/watch?v=KZTjjrWXWuA)
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Sounds like you have no compression. Troubleshoot that and if it was running before leave the idle adjustments for after it actually starts.
Okay, that sounds like a plan. Test compression. I'll get back to you guys on that.
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Okay, so I just tried to start the engine with starting fluid. It didn't start. Someone else mentioned compression. I hope its not that but its looking more and more likely. Dang!
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OUCH!!!
No compression.
https://www.youtube.com/watch?v=EJ0KtjEr3EA (https://www.youtube.com/watch?v=EJ0KtjEr3EA)
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Try adjusting your valves to see if compression returns. Did the engine just die on you when it was running last? A sudden loss of compression could be a bent valve, piston rings lined up etc.
Sent from my Pixel 2 XL using Tapatalk
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I mentioned compression and Pablo is right about the valve clearances. His questions should be answered since they are important keys to diagnosis.
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Quick update here.
The other day I checked to see if I had compression by moving the kickstand by hand to see if it built up resistance. There was no resistance obviously. That leads me to believe I have no compression. I have a compression tester today that I'll install into the spark plug hole to see what kind of readings I'm getting.
I'll get back to you guys on this later.
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good luck, Jay. Eagerly awaiting your results!
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I have another update guys. I had a chance to break down the engine to see if the piston was broken or not. As it turns out I found the result of why I wasn't getting compression. Check out the photos of the bent valve. It looks like its time to get a new cylinder head with valves.
(https://lh3.googleusercontent.com/0gzdRDGS5lxgmkAyvAxK3xNMLstwSa14xQ3HJPKLw72uY9uYl3T80gP9WeFL0YOR_wV0C0qAnr3DupOkLVHHF-eT67D-oIerpUbdEwEFwkzQ0IEvJZZWmeYIjmIKYKcyX40BQENlLndmHzAkumvC1-qgxZ9kuAZGsloDIBArnNhY6VedlsyL_KAtHX7rpAl-wkoiPOgRtTm7MKVaPWVk2xAs7fs97gl7dADcqYX459pWk_c2-xZkbNQ1KvKW9i53m9EffCGhvXSV5Ukar5VkMkDgSvdD69nu2xwCuXH8jN3lCu9Rcv8UVe_uWp4XhnJXSQZckE6Jtm5lBvXjBTWUAavM61TkLbSBUb7h2VqxqxSKDIahLNplRhg796HctYhHDOuL7HgCvJjjv0wC58cAvetb-d6_Ff3B6qS0vPPGK7Glde1bqFqQJzi590lTnRe2_EzlgYlnWRZSzHrjbbU40iR5fbDQTXofLN7ea8XUerMmyN-rWPMQTDWOz2I9yMH4WJ3MtIJMtYgjLQlDL9RfJYAEPDGfv1p8WyZCZeWrOgMmUQk0zy8B3csTO3TnJvv9VgyLfvYCyjhWZiOrR-L2a7TOIB4LdKOGwuUjpl3cIHqG8TA-Kr6oWt9LReLGmpPqoOaEAT9E72XGpA5dF7rfYFTr60wo7CAl4UUpmnzttZKj6hoq6UEFYQCVrqIlQ8s=w800-h600-no?authuser=0)
(https://lh3.googleusercontent.com/teN0Y0uLRfIHPGEm-2mcge5fe8dH6h7-tOu-jjT7CCVFxMU9uTfbyyK7mDwLY--JX3k7QiAtzoucFc2mriBzM6Ziv522TPpnTqCzB-JOA_7lZYjg5HzJOAMl9sJMYFeC8uWjpHDhJEYmsZKIhSlu2EYOYkldWAPP62AJvulNWRSSYnvjZRf-oU1WbD2vyJZLZd28nrm3I_8jcw0dy9JSlE_ebmg_DtwujbX_lr1opfovMhaSv5U3ThWq59Hhu5ifV3TFBpBINpMTCVGlvUTSoTOGpZIGlJVwXsgbcZPJ71spZBEhh7wc4VABW7YFZDKOJAFpTAJx5cwhPl5Yi-Cp-iTgut7bvrMiyYewex092dglh24A8z36nF28hzeueBC6kzjTST-24n0MvA610ZgQ14MsqkvsMvb8nTw--zxubXnc735zqDf3rYQQcqlld3lBjpH1bohTBqE_ARAEThVbNjy_29nkyuBCd09nId_E1vLRT05SMT1F_uw-Sun2B-MqNRhvPUWuUA8Y97hiNWUiSp5FUAej1Yaxo9qlUJNXJ5LIp6ulDpwJVWY1QRdZ4rlcZg9YqQz3GioAmxFR4JbsRO2g-mOu0qdLgptn5OjXlTmrn5YMw6UIxaURPCdWdGqhsfv2JJuZRVrpuv_uCrU_egQ25OE39neWl9aso2WfmEbEphisk5fhX0RGLOtNsCg=w800-h600-no?authuser=0)
(https://lh3.googleusercontent.com/lZ0ZJWLryiwX12PFHSu33cJmbFjSci0UtRGxwI5BI7mBYdoh9iKogDu_E_O3BYID76ntkHnloTkPvWZNvhIY-6Ap5aWm5uKy_Pj4kDZmIFrRkClmCD8IcLowBe87VXFBdbOKaR7owk_gn0AKLQQX8DtWlk-wKRwj7Gp1FJl8_j0xhlgc3D7y8cGT3jjRyBEd34Jk7At9ZHxBv2kJZzDhsFgCOFpF1wM1VtW7tft4KU_EsJ_hGXk-SJFC0gtP6McsOj43bRGK_CcscJPeIhLKmbqYcRA5V7CGsTvLHmmqE5V1POvbUB7Pc1h7DqB-0j5l2RuUWe_w78M3pNMWZXPNeIU5BUvcEUoapRAxHVrOX9aZko27xSBlFfCT2X9Ol0J9EJY5Nfci5hMWESF6rirZhsoKkTnHTZEUv_dMmJNAZAGyTO5thwBpYJg6YTn3JOwXy3zdiBYDvglS7A6UcpxFPRomWc2MXHNmDkAzpHawFkhg-9mcRUTV76DI1dNGXgvNB9q3RARe85Uap4_2nlJNrpwXvOoKlB8K4QvezmAPMI0VQju5PvKss2RoSCKofni6BJEyxEmGmYN7ZHMbovvBt1doEnxG-x2dGopkJv7mLm8lZZ-f3Yis3N3YgrkXqBCrYkLZfU92ZRrx9hFrkZ1PrkEs12N16omji8abyQaY4D_EKT9bLPwPGNZt8-YKDYw=w800-h600-no?authuser=0)
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Yup! That'll do it!
Replace valve. If piston not beat up one valve ought to do it. Lap in the new one, clean 'er up and go for it. Good job!
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It would be interesting to know what caused the bent valve on this scooter.
How many miles are on this scooter ?
Did something just suddenly happened while you were riding, or did somebody fiddled with the valves before it got bent ?
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Sounds like the valve floated and made contact with the piston possibly due to over rev.
Here is a pic of my Skyteam 125 head with a bent valve. It's an easy swap, the only tricky part is getting the valve keepers back in.
https://photos.app.goo.gl/yPszdUbqBn51P4h56
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Sounds like the valve floated and made contact with the piston possibly due to over rev.
Very interesting theory. I’ve never heard about anything like that. I guess this would only be possible if something came loose during over- revving ?
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"Valve float" historically a problem with single springs, cured by double and triple springs, cam profiles and desmodromic valve trains like Ducati. Honda solved the problem with carefully tested (cut and try) spring rates and a little math. Other causes of valves open when should be closed are sticking and keepers popping out. Usually related to poor maintenance. Also usually damages piston.
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"Valve float" historically a problem with single springs, cured by double and triple springs, cam profiles and desmodromic valve trains like Ducati. Honda solved the problem with carefully tested (cut and try) spring rates and a little math. Other causes of valves open when should be closed are sticking and keepers popping out. Usually related to poor maintenance. Also usually damages piston.
Thanks ! I never over-rev anything - so I did not know this can cause problems.
To my understanding there are a few hard-riders on this forum. It might be worthwhile knowing whether over-revving was causing a problem in this case. Maybe all of us should be aware of a potential problem.....
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Update. I ordered a replacement valve. I'll try to install it over the weekend.
(https://lh3.googleusercontent.com/5squboncVrwQNjpUAvSaItKWT_OQaIpBdN5_go7qldiPxEcemqe1qlU40ZPFcqgS0TTRydBv5ymEVFtBwX105wRNnvPSErNqaQ1GMlLcJPsOah60h1BF0G8ehlfkhMqQ25V98jsXrKQk2VJ5VXjJ6UMnCXHn95qZfHDNAirKQqzl_5ZnKEh7PeMuus0C9H5wJQ6Opw3CwhySVR6MX_LJUUZZ2dqakEOp84yTUp_PpkvXTsT87LEFcuUSmDy2AB93UcH263ZpAVFAd_cGifQyQoJrPwxkGZBOK793JXztC6FUpyRpIUI-7RzqC4HF0BbDUCZGaLY7lgbcx-GMUqT-xVRhKH4h_FIGqiRSG3ZAxGyM3G76Ee0EuMaAao6iTUdONXXG3XrfwiQnAigzS-mfYt9C7neTeEPc7-pDPL_mKbB4vYvVNj7xdxeLBMzLpePmIINzjN6W4b49sXtMUpby2Ew0khfKyAUu_nNjyEdNTv6d36f8ZKb43O9ZgeqNe92D0dKLf3aTiJciHnnf1LKjVQDl1be87U_bx3VVmBkBGB-BONAJZWME8dOdh4Bp7-El15BXSxgag7W35zBKbwftY16kD75RWMTtYSk8Kx8asMgfhcSB1Sl3iozxP80Pbtt2WkMgnZBhtetjw95bnXNAREv2KlsdUmIwPu4cDjJWJM4hu1LlhXZTDIIi0dU3TXc=w600-h800-no?authuser=0)