Maintenance & Technical > KX500 Original

Stud pulled out during top end replacement

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demographic:

--- Quote from: Brett --- Interesting note on helicoils did you know that using them for repair of spark plug thread you should use a colder plug due to bad heat transfer through them. ie change from NGK B8EGV to B85EGV
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That is an interesting point, I will remember that one.

Makes sense to me though

hughes:

--- Quote from: Brett ---Yep a helicoil or recoil would de the best option or worst case (generally after these options have also failed) you could loctite a press fit aluminium sleeve with the M10 thread in it.  Interesting note on helicoils did you know that using them for repair of spark plug thread you should use a colder plug due to bad heat transfer through them. ie change from NGK B8EGV to B85EGV
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Brett, Both of your plugs listed bove have the same heat range or am I wrong but both plug have an 8 for heat range.

The B is for thread diameter.

The 8 Heat rating.

The E is for thread reach

The GV is for racing plug. Elctrode is made of precious metals.

Your second plug numbers doesn't look right. B85EGV. Double check.

Brett:
hughes the plug heat range i refer to is a half increment heat range ie from hot to cold series goes 8, 85, 9, 95, 10, 105.  In australia i have raced twostroke gokarts for about ten years and we only ever used either of the following : B#EGV or B#EV in racing.  Worst case you may have to buy a B#ES if that is all available.  Sparkplugs rarely ever die just get wet/fouled nothing that a bit of contact clean cant fix.  Depending on whether the motor we were using was air cooled or water cooled and how much power we were putting out would determine which heat range we would use.  In the case of KX500 i reckon an 8 heat range plug is perfect as the motors don't rev stuffall and often are off the throttle (to get the front wheel down) and i am sure the power output versus the capacity (specific power) is quite low compared to modern 125's and 250's.  Anyway you can buy buy ngk plugs that go up in half heatranges, here i haven't seen any bike shops that stock them but nearly allgokart shops do.

hughes:
That's cool I never even though about that but after some reseach on the internet I found some info about heat ranges in half increments. Just never heard of them or saw anybody running them. I guess we have them in the U.S.A.

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