Re: CBR 954 Head Swap Could Use Some Advice
helicoil has threads on the inside(the size of the spark plug) and on the outside. you basically drill the original hole out n tap the hole a couple sizes bigger. the helicoil screws into that n the spark plug screws into the helicoil. since they are made of steal the threads hold up better than the aluminum block so i think its a better than original fix really. its important to keep your bit at a 90 degree angle n i think its best to start with a smaller bit n move up a size at a time. you really dont hafta drill much past the original threads tho. again when you tap it, take your time n use an aluminum cutting fluid to keep from getting the tap stuck. obviously your probably going to need to take the head off because your going to get shavings all down the hole n that would be pretty bad for the engine! everything you need really isnt all that expensive. much cheaper than a new head n is a solid fix. if your not comfortable drilling it out n stuff just find a reputable shop to do it. just not the epoxy the plug in guy! lol probably wouldnt be much once the head is off the engine.
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