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Old 06-20-2009, 04:55 PM   #1
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Default high speed needle vibrating loose. screw backs out.

Engine has been running like a champ until last Saturday...

To my suprise I noticed the highspeed needle moving while at 1/2 throttle on the bench... basically vibrating loose to an extremely rich setting...screw is backing out on its own..

WTF... I am new to nitro and know that cannot be good...

So what is the fix? new needle?


Thanks for the help.
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Old 06-20-2009, 05:48 PM   #2
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Default High speed needle

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Originally Posted by _Hier_ View Post
Engine has been running like a champ until last Saturday...

To my suprise I noticed the highspeed needle moving while at 1/2 throttle on the bench... basically vibrating loose to an extremely rich setting...screw is backing out on its own..

WTF... I am new to nitro and know that cannot be good...

So what is the fix? new needle?


Thanks for the help.
Just buy the small "O" ring that fits on the needle
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Old 06-20-2009, 05:49 PM   #3
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What motor?
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Old 06-20-2009, 05:55 PM   #4
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kyosho gxr 28

I did pull the needle apart and found a #60 o-ring that hopefully solves the issue.

Thanks for the advice.
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Old 06-20-2009, 10:07 PM   #5
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i had the same problem but both the low speed and high speed did the same thing, i called kyosho and they told me that the o rings that were used in that motor were defective and they know about the problem , they gave me a part number for a the o rings it comes as a carb maintance kit
(KYO74023-17 ) hope this help PM me if you need more help i been through this for a while
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Old 06-21-2009, 03:15 AM   #6
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Meanwhile you can cut a small piece from a fueltube to use as O-ring. Most of the times this will work.
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Old 06-21-2009, 08:46 AM   #7
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True, put a piece of fuel tubing on my sons GT1 at the KC HOA and have not had no problems since then.
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