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Post by trailheadmike on Nov 16, 2013 19:34:32 GMT -5
Here's my first problem in many thousands of miles and I'm stumped. I was riding on the highway on Friday for about an hour on my Vog (257cc Linhai clone) and when i got off on to local roads I stalled. I haven't stalled in ages. Started right back up, but every time I stopped I stalled. When it came time to go home the same thing was happening. I kept the rpm up and made it onto the highway where, at 55-60 mph, I started jerking or hesitating. First I thought it was buffeting, but then it was noticeable to the point where the hesitating could almost be called a jerk or buck. It became more and more frequent so I pulled off the road and as I did the engine died in a bogging sound and that was it. It cranks but no restart. Towed home.
It sounded like fuel to me so so far I have changed the fuel filter and checked that when I crank the engine gas pulses out at the carb. I also checked and I have excellent spark. Valves adjusted recently. I am stumped and would appreciate any thoughts. Thanks.
Don't know if it matters, but when I was just pulling the plug I see that the two long screws that hold on the swing arm came out somewhere. I just put on the new tire so I wouldn't have been traveling like that for long but I'm sure I was when this happened.
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Post by alleyoop on Nov 16, 2013 19:57:24 GMT -5
Well that sure sounds like Valves to me, but it could also be a fuel problem.
Test the fuel delivery take the fuel hose off the carb put it in a container and crank it see if fuel flows in a nice stream.
Also check your fuel filter it may be clogged as well.
Alleyoop
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Post by trailheadmike on Nov 16, 2013 20:07:02 GMT -5
Well, since I typed this I put the plug and the boot back on and I cranked it just for the heck of it and she fired right up. Could it have been a loose plug or boot? Hmm.
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Post by alleyoop on Nov 16, 2013 20:39:32 GMT -5
Yes, it could and then it could be tight valves as well after it cooled off enough the valves sealed also it could be fuel in the bowl filled it up while sitting there. So If I where you I would check some things out, before you take it on a long way from home.
Alleyoop
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Post by tvnacman on Nov 16, 2013 20:47:12 GMT -5
mike do a compression check if I remember your in the 10k + miles ?
John
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Post by oldchopperguy on Nov 17, 2013 13:52:14 GMT -5
Well, since I typed this I put the plug and the boot back on and I cranked it just for the heck of it and she fired right up. Could it have been a loose plug or boot? Hmm.
One riding season my old Xingyue 150 GY6 started a similar "routine". I never did diagnose the actual single cause. However, it had to have been either the plug-connection as you mentioned, or, a connection at the CDI. The plug wire was not well-connected at the cap that snaps onto the plug, and, the wires coming from the plug on the CDI were REALLY "wonky" with one having only a few strands of wire attached. Both the coil and CDI were getting along in age, so I replaced both with a Bando "orange" coil, and "Red" eBay CDI. I also "primped and crimped" the connections on the CDI plug. After that, the problem went away for the remaining several years I rode the little guy.Your problem sounds like the one I had, but it also sounds like valves, as Alleyoop described. You recently adjusted the valves, so maybe something went amiss? Worth checking again "just in case". It's irritating that several different conditions can cause the same problems...I haven't had my watercooled 250 long enough to have learned anything about the breed, so I'm not able to give specific advice on them... But they must have SOME similarities with their air-cooled 150 cousins. From experiences with my old Xingyue, I did learn to suspect each and every ground-connection, and every little wire with a crimped-on aluminum connector, or plastic plug, as well as the spark-plug boot, AND the coil, and CDI themselves. (In addition, my Kymco now has some automotive-style "black-box" computer gizmos, so Heaven help me to diagnose THOSE if the ever go south!)
The slightest corruption of "anything electric" including grounds, can and WILL cause intermittent, or full-time missing, bucking, stalling and all sorts of misery that would require a technician with proper diagnostic equipment quite a while to diagnose. Even then, if the problem is a poor electric connection that only acts up intermittently, it might check out OK one time, and bad the next. Alleyoop is a lot more knowledgeable than I am, and I'd surely follow his advice. I'd also make "double-sure" the fuel flow is full-time and not "problematical" at speed as it can with a faulty vacuum-petcock on the 150's. (My Kymco uses a sort of vacuum-diaphragm-operated fuel-pump delivering gas from the floor/tank, which I suspect might give me grief one day... LOL!)
I'd also though, check every wire possible for a bad factory-crimp, broken metal prong/connector, etc. A "sometimes" connection ANYWHERE could be the problem, and with some years and miles on a scoot, sometimes the thin aluminum wire-ends often used will corrode, crack, etc. from age and electricity flowing... and SOMETIMES they weren't properly crimped on at the factory. THAT turned out to be my problem on the 150. Worth a try anyway!Ride safe!Leo in Texas |
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Post by trailheadmike on Nov 17, 2013 16:14:31 GMT -5
Well, since I typed this I put the plug and the boot back on and I cranked it just for the heck of it and she fired right up. Could it have been a loose plug or boot? Hmm.
One riding season my old Xingyue 150 GY6 started a similar "routine". I never did diagnose the actual single cause. However, it had to have been either the plug-connection as you mentioned, or, a connection at the CDI. The plug wire was not well-connected at the cap that snaps onto the plug, and, the wires coming from the plug on the CDI were REALLY "wonky" with one having only a few strands of wire attached. Both the coil and CDI were getting along in age, so I replaced both with a Bando "orange" coil, and "Red" eBay CDI. I also "primped and crimped" the connections on the CDI plug. After that, the problem went away for the remaining several years I rode the little guy.Leo- I had a stalling and starting problem early on with this scoot and it ended up being just what you mentioned - the black and yellow wire going into the cdi has a poor connection and once i fixed that I never had the problem again. I need to wait for the bolts to arrive so I'll have some time to check some other things while I'm waiting. How I lost those bolts I'll never know, although I probably put them in by hand and forgot to tighten them. They're m8x75mm, which of course means that no store in the tri-state area could possibly carry them. -Mike |
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Post by tvnacman on Nov 17, 2013 16:25:05 GMT -5
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Post by trailheadmike on Nov 17, 2013 16:52:16 GMT -5
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Post by tvnacman on Nov 17, 2013 18:57:21 GMT -5
That's a nice find Mike
John
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Post by oldchopperguy on Nov 18, 2013 12:08:15 GMT -5
Trailheadmike,
I've had very good results finding weird metric stainless grade-8 bolts at Lowe's home improvement stores. I've never looked for long ones, but you might find them there. From 75 to 80mm is only a shy 1/4" so maybe those would work. As for "why" they come loose? Maybe you didn't tighten them, but they DO have a habit of doing such shenanigans...
Use that thread-locker... LOL!
Ride safe!
Leo
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Post by trailheadmike on Nov 18, 2013 12:22:46 GMT -5
Loews had a hexbolt the right size on the website but they were not carried in the store unfortunately. I use an impact wrench for these bolts so my guess is that I screwed them in by hand and just forgot to tighten them. I was reinstalling the rear wheel. and replacing the brake pads that day and I probably forgot. No other explanation for losing them both at the same time.
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Post by earlylight160 on Nov 18, 2013 13:55:11 GMT -5
You might try Fastenal at: www.fastenal.com/web/home. I have found them to be a great source for stainless metric hardware for my diesel auxiliary engine in my sailboat. They have 2,600-plus Fastenal stores nation-wide. |
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Commuting is the best part of my day!
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Post by trailheadmike on Nov 18, 2013 14:19:24 GMT -5
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Post by earlylight160 on Nov 18, 2013 16:11:56 GMT -5
You might ask if they can special order what you need. My local Fastenal store has ordered special bolts, nuts, etc. for me. Usually takes 3 or 4 days. Good luck!
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..BAD TO THE BONE..
