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Liam Bamber Posted on Nov 01, 2013
Answered by a Fixya Expert

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Will not start

Well for more details or if you know a possible solution please email me i have a derbi gpr 125 4 stroke was running fine a few days ago one day started it up let it warm up to normal running temp got on the bike about to go out and just cut out when applying the throttle just boggs down but when idling will run for a while then cut out i have used carb cleaner and fuel cleaner just in case their is a possible blockage preventing it from working correctly any information would be greatly appreciated Email address : [email protected]

1 Answer

Canera Miles

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  • Expert 78 Answers
  • Posted on Nov 01, 2013
 Canera Miles
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Joined: Oct 29, 2008
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If the bike only run when choke is on you may have have a plug metering jet. Small jet located in the carb body near the main jet.
Jet could have unscrewed from carb due to vibration.

5 Related Answers

Anonymous

  • 46 Answers
  • Posted on Mar 05, 2009

SOURCE: 2005 CRF450R Hard to start and wont idle

Hi
I would suggest that you have the valve clearances checked.

Also, check that the carb is clean. Pay particular attention to the PILOT JET as this opperates the idle circuit.

Jon

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tombones

  • 3567 Answers
  • Posted on Mar 14, 2009

SOURCE: cbr 125 choke problem

It sounds like the choke line may not have been routed correctly when the new one was installed. Remove the gas tank and check to see that the line is not being stretched anywhere along the way AND that the gas tank when re-installed is not stretching the line. The line may have been kinked when installed. Look at the mechanical movement of the choke at the carb. Does it operate freely? Remove the air filter and look inside the center of the carb, (you may need to use a small mirror for this), does it look like the choke is opening and closing properly when the choke is moved on and off?

Trevor Kiriaka

  • 4 Answers
  • Posted on Oct 22, 2009

SOURCE: 2006 Yamaha TTR 50E pouring oil out of air cleaner housing

With the oil problem I read on another site that Yamaha did that so that excess oil would be burned up in normal running (but this was usually smaller amounts). Anyways they disconnected the tube going to the air cleaner and had tied up in such a way that any excess oil would land on the chain thus lubricating it. But if you have that much oil coming out it could be that you have put in too much.

sisadsl

gavin jones

  • 1508 Answers
  • Posted on Apr 04, 2010

SOURCE: I have a 2002 Buell Blast that runs rough after

check valve clearances, and low voltage can cause backfire, battery voltage should rise when revved, use a digital multy meter

Anonymous

  • 3 Answers
  • Posted on May 08, 2010

SOURCE: Derbi GPR Speedo stuck on KPH

yh you have to select a certian mode and put in a code or something like that i got told in a shop i got mine from so if u have a booklet or a shop near you they would probly do it for free but i THINK you need a code

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