John
A pragmatic approach for a man without a lathe is to find an old bolt that will drop into the guide. 1/4 work well. Run around the head with a file/angle grinder to take the corners off and make sure that it will clear the 1/2” OD of the guide.
Find a separate short length of round bar (10mm works well). Then use this two part tool to drift out the old guides.
Pull the new guides in with a length of 1/4” (or M6) studding using nuts, odd 1/2 sockets, fat washers and all sorts of bits to get the right set up.
I’ve always found that new guides need reaming to get a good fit with a new valve.
However, this could be the ideal excuse to buy a lathe. A workshop is incomplete without one.
A pragmatic approach for a man without a lathe is to find an old bolt that will drop into the guide. 1/4 work well. Run around the head with a file/angle grinder to take the corners off and make sure that it will clear the 1/2” OD of the guide.
Find a separate short length of round bar (10mm works well). Then use this two part tool to drift out the old guides.
Pull the new guides in with a length of 1/4” (or M6) studding using nuts, odd 1/2 sockets, fat washers and all sorts of bits to get the right set up.
I’ve always found that new guides need reaming to get a good fit with a new valve.
However, this could be the ideal excuse to buy a lathe. A workshop is incomplete without one.