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any one know where i can buy the removal and installation tools to R&R an injector cup on a dohc cm870? i know they used to change the cups out , but now they say you need to change the head.

Change the head.

https://static.nhtsa.gov/odi/tsbs/2019/M...6-9999.pdf

Check this out, it will answer your question.

Do not waste your hopes and dreams on those rubbish blue injector o-rings. They will tear and leave you staring down the barrel of a cylinder head replacement again in a month.

Yup…. What these guys said