Hard Start and Mild backfire

3 replies to this topic
  • exokiler

Posted July 30, 2015 - 06:52 AM


Hey guys so I finally got the JD JET kit on my bike and I put exactly what they said to put for jets and needle. Bike runs good once started but is hard to start at first *wont start with electric start* and when riding and you let off the throttle it has mild back fire if you down shift.


It was a lot cooler out when I rode yesterday compared to last week when I rode. Maybe need to retune the fuel screw or what?




  • WRistheWay

Posted July 30, 2015 - 03:57 PM


Have you checked the valve clearances? That can make it hard to start when cold. Also did you change the pilot jet to a different size? If so the fuel screw will definitely need to be re-tuned. You can probably get rid of the backfire by turning the fuel screw out in 1/4 turn increments until you can live with the popping and still maintain a strong idle.

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  • Krannie McKranface

Posted July 30, 2015 - 05:30 PM


...back fire, or decelleration popping.

...back fire is literally through the carb.....


Have you installed a R&D remote fuel screw and learned how to adjust it: you seek highest idle with the fuel screw, then re-adjust idle with idle screw, and repeat.


If it takes more than 2 turns out, your pilot is too small.


45p is what you want.

  • Mcflyz450f

Posted July 31, 2015 - 12:52 AM


you can contact them https://www.jdjettin...ction=contactus  they will help you out.

Edited by Mcflyz450f, July 31, 2015 - 12:52 AM.


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