SOHC.co.uk Forums > CB350/400

Spark plug cross threaded

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Bryanj:
I have many times helicoiled in situ, there is a small risk but nothing serious.

Fill the supplied drill flutes with greas and drill very slowly

Fill the tap flutes with grease and tap slowly removing frequently and cleaning re-greasing

sray carb cleaner or WD in the hole and start the engine ewithout that plug in so all the sh!t gets blown out

Fit insert and plug

Done loads and only had 1 where a small bit of alloy swarf got stuck to a valve seat--no damage and OK had to take head off but that was the alternative anyway

Greg65:
Thanks for the encouragement. Job takes me abroad for a few days so will try and order a kit ready for a spot of engineering next weekend.

Cheers
Greg

Greg65:
Hi, just a follow up. Finally got some time in the shed after deciding on a back tap which I got from "motorcycle products". Not a high quality too but a£30 I thought it was worth a go. I successfully managed to back tap and clear the threads. Hopefully it will last or it will be re thread time. The only complaint I had about  the tool was that the tap did not reduce in diameter sufficiently to insert without scraping the threads when inserted. This was a function of design and a comment was forwarded to the supplier.

Thanks for all the advice,

Greg

Saisei:
Just watched a Youtube video on the Backtap tool. What a great idea. One question. Who are "Motocycle Products?"

royhall:
M&P. Cheers Roy

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