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Yiben Hurricane 125 wont go above 40mph. In need of help =]

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aaron9924
L Plate Warrior



Joined: 11 Aug 2011
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PostPosted: 14:58 - 11 Aug 2011    Post subject: Yiben Hurricane 125 wont go above 40mph. In need of help =] Reply with quote
Hello there, I’ve just bought myself a 'Yiben Hurricane 125 4 stroke', its only done 3000 miles and has developed a problem with the bikes top speed. The bike gets up to 40mph quite quickly but then keeps jolting back at 40mph.

I've replaced
The rollers "worn"
Drive belt "worn"
Automatic choke "because it was stuck open"

I’ve taken apart the carburettor and cleaned every part of it, I’ve checked the air lines, fuel lines, air filter, I’ve taken the exhaust off and it doesn’t seem blocked.

I can’t think of what else it could be, if anyone has any ideas of what it could be or has had the same problem id be grateful to hear them.
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grant965
Brolly Dolly



Joined: 02 Mar 2011
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PostPosted: 16:12 - 12 Aug 2011    Post subject: Reply with quote
somehow restricted to that speed?
____________________
Ex bikes: 05 Suzuki En 125, '98 Yamaha Thundercat, '08 Honda cbr125, '05 Kawasaki z750, '03 Triumph Daytona 600, '91 Kawasaki ex250, '03 Hyosung Comet 125
Current Bike: '02 Suzuki TL1000R
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Frost
World Chat Champion



Joined: 26 May 2004
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PostPosted: 16:29 - 12 Aug 2011    Post subject: Reply with quote
Could be air or fuel, flush and clean the fuel system, clean / replace the air filter.
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aaron9924
L Plate Warrior



Joined: 11 Aug 2011
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PostPosted: 19:04 - 12 Aug 2011    Post subject: Reply with quote
grant965 wrote:
somehow restricted to that speed?


Its a problem that developed with the previous owner which was why he sold it. Its hard to explain what the bike does, I can get it up to 40mph easily but then the whole bike starts jerking forwards and backwards like it wants to go faster but cant.
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humanbeing
Nova Slayer



Joined: 20 Mar 2011
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PostPosted: 22:20 - 12 Aug 2011    Post subject: Reply with quote
Common problem in GY6 clone after some time, tune valve clearance to IN/EX 0.12mm
1-6 https://www.youtube.com/user/jyunje#g/u
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