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| 150cc GY6 and Under Engine Tech GY6 and Smaller Technical Discussion Forum |
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#1
04-19-2010, 02:42 PM
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striped spark plug hole
so my carbide stalled and i checked it over to see the spark plug out, when i went to put it back in the cheap cap broke so i went out and got a new NGK racing cable (all they had) put it in and after 10 min. of riding it happened again put it back in and it shoot right back out from the compression.
So what should i do new head, tap and helix coil , tap and bigger plug? Another question are these heads aluminum coated? 
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#2
04-19-2010, 04:25 PM
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http://www.thorintl.com/Keenserts-Ke...ng-Inserts.htm. just follow the insructions, i recommend removing the head before you do it.
not coated, made of.
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alsdaboss, operator of, The HELI-MONSTER All stock they test my welds by blowin em up. Last edited by alsdaboss; 04-19-2010 at 04:31 PM. Reason: better link
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#3
04-19-2010, 06:28 PM
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Thanks, PatNY 2008 HammerHead Super Sport 250cc 32mm Performance Pumper Carburetor Uni Filter Hammerhead Performance Exhaust 145 Main Jet 40 Pilot Jet 1/4 Fuel line Black MRP CDI MRP Performance Coil NGK Iridium Plug Dr.Pulley HIT Clutch White MRP Main Torque Spring Dr.Pulley Variator Dr.Pulley 19gr. Sliders Kenda Front Max 20 x 7-8 Interco Swamp Lite 22 x 11-10
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#4
04-19-2010, 07:28 PM
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I myself am not a big fan of helicoils and/or inserts. Back in the day I had an Allis Chambers Terra Tiger (6 wheeler) with a JLO Rockwell engine in it. A buddy was helping me with some engine work on it, he over torqued the plug and stripped it. I went the helicoil insert route, it was done right, tapped, measured and all that, and it lasted a day. On these machines the engine sat straight up and was literally between your legs and you leaned over it to grab the handle bars. (Yep, Terra Tigers were the only 6 wheelers I ever saw with handle bars instead of control levers, but I digress! lol) Anyway a spark plug zinging right past my chin at full compression was enough to for me to whip out the old Traders Guide and start looking for JLO engines for parts. I say if your gonna pull the head anyway to do the helicoil insert, just replace the head.
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#5
04-19-2010, 09:53 PM
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i replace the head
olderthan
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olderthan 2008 tomberline punisher 1500 spring 12g sliders 30mm cv pumper carb uni filter no rev cdi polaris xlt snowmobile shocks for front w/550 magnum springs & blaster fronts on rear and another buggy built working on mods gk-13 white spring 17 gram sliders so far
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#6
04-20-2010, 03:53 AM
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Firstly, put in the correct plug. That nkg you mentioned is a cold plug with a short reach and a different type of sealing ring. It would have threaded in but probably not be sealing properly. If the threads are stripped, replace the head. Any thing else you do to a aluminum head will only be temporary. Aluminum heads will not hold any sort of helicoil insert very long due to different heat expansion rates between the head and the coils.
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#7
04-20-2010, 08:14 AM
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had a keensert in my wifes audi engine for 4 years, worked great. thermal expansion is no different between the head and keensert, and the head and a sparkplug, and should not be an issue. helicoils should not be used in a cylinder head, as they are a temporary repair, and do not provide a seal. they work in a pinch, but a keensert will save a head from being scrap.
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alsdaboss, operator of, The HELI-MONSTER All stock they test my welds by blowin em up.
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#8
04-20-2010, 04:02 PM
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ckau is right, just replace the head. They are not that expensive. Plus, to do the heli coil you have to generate a bunch of aluminum filings. Guess where they go. Changing out the head is not that difficult.
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#10
04-29-2010, 05:09 AM
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What did they do to it to fix it? I would have contacted Tom Syc and either got a large port head or a ported and olished head my self. But then again I like to up grade as needed as well
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#11
04-29-2010, 05:33 PM
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I am curious as to what they did to fix it as well.
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#12
04-29-2010, 06:22 PM
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i would also like to know what their repair was
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olderthan 2008 tomberline punisher 1500 spring 12g sliders 30mm cv pumper carb uni filter no rev cdi polaris xlt snowmobile shocks for front w/550 magnum springs & blaster fronts on rear and another buggy built working on mods gk-13 white spring 17 gram sliders so far
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#13
05-04-2010, 05:57 PM
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it was a heli coil i would have ordered a new one or an upgrade but it wasn't in the budget and i didn't want to play around with the valves or wait for shipping
i asked him if it was a guaranteed permanent fix and he said it was and they used them in cars all the time
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