05-09-2011, 02:48 PM | #1 |
Join Date: May 2011
Posts: 3
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ZS250-5 Bike won't go over 60 mph?
I recently bought my first bike, it is a 2006 Zongshen ZS250-5 Sports bike. 250cc. It has around 1700 miles on it, and according to the previous owner, it had been sitting in a shed for about 6 months before I got it.
Anyways, it starts up fine. However, I just took it on the highway for the first time today, and couldn't get it over 60 mph. It goes up to 120 mph on the speedometer, and up to 14k rpms, but I couldn't get it over 8k rpms either. I have to get it all the way to 4th gear to go around 40, and then anything above is 5th gear. With full throttle in 5th, it goes around 7k rpm and 55-60 mph, and I can feel it cutting out a bit like it isn't getting gas. So, my question is: how do I fix this? Is it just a cheap bike and I am SOL? What do you suggest I do? I think I will take it to a local cycle shop to see if I can get it tuned up and whatnot, but I'm wondering if there is anything I can do myself, as I'd like to learn. Many thanks in advance! I greatly appreciate your time. |
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05-09-2011, 03:26 PM | #2 |
Join Date: Mar 2009
Location: Southeastern Washington desert
Posts: 14,761
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Yours runs, so you have other ZS250 owners beat.
This bike does not seem to share the exceptional reliability of the ZS200GY. As far as performance goes I never got mine running so I have no first hand info, but I would expect a mildly tuned OHC 230cc (it's only nominally a 250) to go about 75 with a 180 pound or less sized person on it. This would mean level road with no wind and tucked. At least 70. The speed and tach are generic and have nothing to do with any particular application. They do look good though. Based on my personal experiance, I'd start by checking the compression. You should be getting at least 125 PSI, hopefully more than 150. Start there.
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05-09-2011, 08:35 PM | #3 |
Join Date: May 2007
Location: Altamont, Kansas
Posts: 15,103
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Since it sat for awhile I would suspect the carb to possibly be plugged too.
A good carb clean may be needed.
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05-09-2011, 10:16 PM | #4 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Welcome!
Most China bikes are a little on the lean side. A fatter main jet might be the answer, especially if the PO modified the intake or exhaust at all.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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06-22-2011, 02:54 AM | #5 | |
Join Date: Jun 2011
Posts: 13
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Quote:
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06-22-2011, 10:01 AM | #6 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Sometimes that's not adequate. I remove the carb, turn it upside down and remove the float bowl, remove the float valve, main jet and slow jet and blast all passages with aerosol carb cleaner. I carefully inspect the main and slow jets to see if they're plugged and clean/replace as necessary.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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