is there any jig to fix the thread for the spark plug? or any angle to straighten the head before we fix the thread? My front head spark plug thread broken. Need to fix it. have to tell the machinist if there any jig or angle to do it. Thank you...

 

any one who claimed to be a machinist and need a tool to set a spark plug angle in the milling machine needs a different job

a tool is available for that in a productions shop but the tool is 700 US dollars - as it does every angle on all the old heads for valve seats - valve guides - plug holes and alike

 

Is the thread broken off or have you just stripped off a few treads? Im thinking you might be able to just get a tap and chase the threads.....

 

Thanks man. Will send it to a machine shop after i try to find a tap for it and do it first. If fails then send the head to be machine

 

All the thread gone. Kickstart it and the spark plug flew off. Checked the thread, all gone. Im going to find a tap for it at a car spare parts and try rethread it without taking out the head. If fail then off to machine shop.

 

A Tap is Not going to make the Head "grow" threads...
You need a welder/machinist that has already done a Harley head!!!

 

I blew a plug in my E350. There's a kit they sell that Cleans the hole and you put in a threaded piece.

 

Agreed with you. what i mean like a spark plug thread repair kit which included an insert like the helicoil, tap and might be a drill for the insert

is it a M14 (1.25 thread)? Correct me if im wrong... i measure it with a gauge but i might be wrong

 

Do yourself (and your bike) a favor. Pull the head, weld and retap the hole to the correct dimension and size. Helicoil is a temporary (at best) fix and will eventually (sooner not later) fail. You do not want to be on a stretch of road, a long way from nowhere, and have the plug and helical fail.

Repair it once, the right way.

 

+1
bt-dt