Question about 2004 Sym Husky 125

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My sparkplug on my sym symply 50 moped keeps on falling out whilst i'm riding. i think it may have cross threaded or been overtightened when i changed it, and worn away at the thread. what do you think? and do you know any cost affective ways of repairing it. i was thinking about maybe using treadlock or simlar, but was advised against..

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  • Sym Master
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Unfortunately this is a critical area and the spark plug threads are important because the plugs needs to be tight as well as hold the compression without any leak.
So since the thread on the cylinder is worn out then it requires that a new thread be tapped into or the cylinder head must be changed. Use of any metal filler or adhesive may not be good in the long run or is dependable.

Posted on Mar 16, 2011

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  • Master
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Hi and welcome to FixYa, I am Kelly,
There is a heli-coil kit that you can get at most auto parts stores to do this repair and do it yourself.
http://www.sjdiscounttools.com/hel5334-14.html
HeliCoil 5334-14 - Sav-A-Thread 14Mx1.25 Spark Plug Thread Repair Kit This Time-sert repair is actually the best one but takes a very expensive special tool kit to install the inserts:
http://www.timesert.com/html/sparkplug.html

Most reputable motorcycle repair shops can do this for you..
or a machine shop. The head does NOT have to be removed but you must be able to remove any filings from the cylinder and head post repair.

Thanks for choosing FixYa,
Kelly

Posted on Mar 16, 2011

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