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Post by mk9750 on Jul 18, 2013 19:41:33 GMT -5
Well, I took the scooter out for a ride just to blow the sting off a bit. I was going about 40mph about 3 miles into my ride, when all of a sudden, the tone of the motor changed to a very high pitch, it sounded like the exhaust was coming more from the front of the scooter rather than the back. Also, whenever I slowed down, it backfired. Not loud, but a definite backfire.
The only thing that I believe could have caused this was that I adjusted the valves. Anyone have any ideas what I should look for?
Thanks!
Mark
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Post by Deleted on Jul 18, 2013 21:10:39 GMT -5
Recheck the valves if thats the last thing you touched. Maybe the locking nuts were not tightened.
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Post by ltdhpp on Jul 18, 2013 21:17:14 GMT -5
If the air intake hose or a tube on it comes loose, it will make noise similar to exhaust noise, maybe you disturbed something.
If it's pulling more air than it should, it can make it run lean and backfire too.
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Post by woowilly on Jul 18, 2013 21:25:35 GMT -5
That matches the symptoms I had when the nuts that hold the exhaust pipe to the head came loose.
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Post by mk9750 on Jul 19, 2013 6:49:45 GMT -5
Thanks all. Three good possibilities. I wouldn't think the nuts on the valves would be loose - I tightened them up pretty well. But you never know. As I was thinking about this, I did wonder about the hoses. When I removed the valve cover, the hoses were starting to crack a bit. Perhaps one finally gave out because I moved it around. I'll check tonight. And I had forgotten, but I did have one of the nuts come off the exhaust pipe a couple years ago, and the sound the motor made seemed to be coming more from the front of the bike like it is now.
With my luck, all three will be the problem.
Thanks again!
Mark
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Post by jeepsteve92xj on Jul 19, 2013 7:47:19 GMT -5
exhaust nuts would be my first check.
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Post by prodigit on Jul 19, 2013 7:56:10 GMT -5
DX
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Post by scoots on Jul 19, 2013 17:30:05 GMT -5
when i go over 40mph mine gets highrt pitch its just my RPM screaming also bc i have a Blue CDI unlimited rev)
and when i slow its normal so may be ur RPMs thats what mine do
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Post by Deleted on Jul 19, 2013 17:43:20 GMT -5
So what was it?
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Post by mk9750 on Jul 19, 2013 18:21:09 GMT -5
I just got in from taking it for a test drive. One of the hoses popped of the valve cover. Everything is great now, but I am going to do what I should have done when I noticed the worn hoses and replace them all. Should allow me to get closer to my asking price at least.
Thanks everyone for your willingness to help!
Mark
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