If I remember correctly the Quantums are side valve engines. Have you checked for either a sticking valve or if the valve have made to near zero clearance?

Entire Thread
Subject	Posted By	Posted
B&S Quantam motor	NormK	26/12/23 02:48 AM
Re: B&S Quantam motor	maxwestern	26/12/23 06:38 AM
Re: B&S Quantam motor	NormK	26/12/23 06:47 AM
Re: B&S Quantam motor	maxwestern	26/12/23 07:27 AM
Re: B&S Quantam motor	NormK	26/12/23 08:52 AM
Re: B&S Quantam motor	AVB	26/12/23 04:07 PM
Re: B&S Quantam motor	NormK	26/12/23 10:28 PM
Re: B&S Quantam motor	NormK	27/12/23 08:51 AM
Re: B&S Quantam motor	AVB	27/12/23 12:15 PM
Re: B&S Quantam motor	NormK	27/12/23 11:29 PM

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