Question about Yamaha DT 125 R Motorcycles

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Only runs with choke on

Hi my dt125r will only run with choke on once i turn it off the bike dies soon after even when warm? any suggestions to problem thanks?

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  • 1,162 Answers

Carb no doubt needs a rebuild. Dirt, debris, is not allowing fuel in. Check fuel lines as well. No need to do a part job. Carb ports easily get clogged

Posted on Mar 30, 2014

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Posted on Jan 02, 2017

  • 113 Answers

SOURCE: This bike is a 2007 and is extremely cold blooded

Try adjusting the fuel/air ratio screw on your carb. i would start by turning it 1/4 counter-clockwise to allow more fuel to flow in.

Posted on Sep 22, 2009

Testimonial: " there is no air screw on this model for some reason just a fixed jet inside the float bowl.Thanks anyway."

  • 13 Answers

SOURCE: Engine dies when choke is taken off or when throttle is applied.

where the valves set cold or hot? could make the world of a there intake leaks? bad floats perhaps....its a problem that will take some time cancelling out problem by problem

Posted on Oct 09, 2009

SOURCE: My 2005 Sherco 290 trials bike stalls when hot

Best would be to blow compressed air to the jets and also to check and reset the float level.
Hope this helps!

Posted on Oct 31, 2009

  • 1 Answer

SOURCE: Hi, My honda shadow 750 has a choke that when I

Ring around choke plug needs to be turned to hold choke plug in place...

Posted on Jan 25, 2010

  • 3567 Answers

SOURCE: will only start and run with choke on. have to

The pilot jet circuit is plugged up. Clean the carb. Remove the vacuum valve and keep it away from any spray. Remove the choke, air and throttle screws then spray into every hole you can find. The spray should go in one hole and come out another hole. Pay special attention to the jets. Important > count the number of turns inward to lightly seat the throttle and air screws. This is the number of turns you will need to open the screws after lightly seating them during re-assembly. Please rate my answer. Thanks.


Posted on Aug 12, 2010

Testimonial: "Thanks for the troubleshooting! I wasn't sure where to begin a fix (valve timing or carb. cleaning). Thanks for the cleaning advice. "

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1 Answer

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Hi Most likely your engine shut off first then the light goes on as soon as the engine oil pressure dropped sounds like you have a carb problem and the motorcycle is running on the choke circuit. then it dies after the choke is turned off.

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I have a cagiva mito 125 evolution 1999 it will only run with the choke on all the time. I have cleaned the carb and jets and drained the tank and added fresh fuel but it still does the same, and when you...

Hi, Wayne4000uk and the usual suspects are:
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Sounds like the idle circuit in the carb is restricted. The engine is running on the choke only. When the engine reaches a certain temp the fuelthat does get is more readily burned allowing you to back off the choke. The choke probsbly can't be completely opened? right? Fuel quality is also something to consider Oil content in fuel affects combustion temps and volatility. _good luck_Ned_

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