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Post by steve on Nov 25, 2015 16:17:36 GMT -5
So this has happened to me on both of my scooters. I swap the carb on them when I switch back and forth, but that's it.
It happens every now and then. Going up hills, or on long periods of WOT. I will try to describe as best as possible. A noise that almost sounds like a loud electrical hum will start, kind of like a loud, really fast clicking sound. It will get louder and louder, then the scoot will just wind down and die. It will start back up after a few minutes and go.
I suppose it could be a really loud valve tap? Does anybody know what this is? Has it ever happened to any of you? I am stumped. I have a 52mm BBK it has happened on, and a 50mm BBK it is happening on.
Any help, I would greatly appreciate. Thank you,
Steve
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Post by scooter on Nov 26, 2015 6:06:02 GMT -5
maybe a relay clicking on and off?
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Post by steve on Nov 26, 2015 6:10:43 GMT -5
What relay would kill the engine, though. It's really loud, and gets louder and louder.
Is there anything with the valves that would make them start tapping really loudly, and kill the engine? I'm starting to think it's the valves.
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Post by cyborg on Nov 26, 2015 7:04:02 GMT -5
A video would help,,,it sounds like you have an issue with the valves,,,
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Post by steve on Nov 26, 2015 7:32:14 GMT -5
I was thinking the valves.
I can't make a video, because I don't know when it's going to do it, and it happens when I'm going down the road.
I will try to describe the noise: You remember when people used to put a card on the wheels on their bicycles to rub against the spokes of the wheel? Imagine putting a really thick credit card to rub against the spokes on a bicycle wheel, then make it louder. That is what it sounds like. It happens under load. Do ya'll think it's a valve clearance issue?
I also noticed a lot of smoke coming out of the valve cover vent when I crank it after that happened. Anybody have a solution? Should I set the valve lash larger, or smaller than .004?
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Post by hillbillybob on Nov 27, 2015 5:25:05 GMT -5
You say this only happens when "Going up hills, or on long periods of WOT", and "It will start back up after a few minutes and go".
Classic signs of overheating, sounds like it is running too lean to me, and that would mean your problem is in the carburetor jetting......I really doubt that both scooters have valve problems, and you did say both act up when running this particular carb.....Am I reading that right? Have you rejetted it for the the BBK?
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Post by steve on Nov 27, 2015 6:59:29 GMT -5
Alright, I'm pretty sure I figured it out. I bought a new feeler gauge, and compared the .005 on both of them. The one I was using was machined wrong, or is mis labeled. Anyways, the gap was set WAY to large on both scooters.
On top of the problem I mentioned, it had become very, very difficult to start. After setting the valves correctly, it fires right up immediately, no problem. And it seems to be running great.
All signs point to it being a valve problem. I will update later, but I think it was a faulty feeler guage. The one that I was using that was labeled .005 was close to .010-.011.
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