SOHC.co.uk Forums > CB750
Spark plug nightmare
Bryanj:
Back in the 70's we used to do them in frame with helicoils BUT it was explained to customer it was at their risk as you may still have to remove the engine, only had to twice
sprinta:
--- Quote from: Laverda Dave on June 29, 2024, 10:20:39 AM ---A few people have used these kits, cheap and easy to use. Make sure you use plenty of grease on the tap to trap as mucg swarf as possible whilst tapping the thread. Check the plug size and thread as well as there are a few kits out there.
https://www.ebay.co.uk/itm/264507390056?epid=6024255209&itmmeta=01J1HMKW8Z97DWPAGQ328T5H6W&hash=item3d95de7868:g:uZMAAOSwEJZjToA8&itmprp=enc%3AAQAJAAAA4KJAmHit8gk4yKYXbCnvy3fRue1wPZklwrEyEoSlO5o5aBIDae05IbiRx2ZrV3vO7xd4JtaIuXmAhm2zKFXy%2B6QFG1frkWmq7pO1nOzyuhCChDcX1YF6NYQuqhsssTlB33ArWYV7mvBvPCKxve7KVzTp0Dq3j%2FLhyquE3rlYFO%2B1XLcqePgSrgOptPfXXe%2FBINs%2FpfiGnWo3Rz9r5wY%2B8oCl0I305qx%2BYulxH8sGBiRpFlnXoFl%2FQ7l--EbhyyoP2iPCiQNAvouiPSENfMCJVYK0AbObKREy6MSkw4VSlRAd%7Ctkp%3ABk9SR8zEz7SMZA
--- End quote ---
The problem with this type of insert is the flange on the top. You need to rebate the face of the head so that this flange sits below the surface if not when you tighten the plug it with tighten up against this raised flange and there is every likelihood that as a result you will unscrew the insert when you remove the plug. If you are going to try and repair the thread in situ it may be best to use a helicoil as this will be fully below the surface? Best to get some expert advise before proceeding.
Pauarc:
The engine is ready to lift out then the head will be coming off to do the job will then see what needs to be done
Spitfire:
Yes I had a CD175 once with a flanged insert, it came out everytime I took the plug out, at the time it did not bother me but I'm a bit more fussy nowadays.
Cheers
Dennis
Moorey:
Apply Studlock 270 just to the insert when you put it in it stops that happening.
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