Hello all! I have a 1958 Evinrude Lark 35 that came on a 1958 Bristol Bluefish. I have begun to restore the rig and have torn the motor down. Before doing so, I did a compression test and it had 120 on the top cylinder and between 110 and 115psi on the lower. When I removed the head, the lower cylinder does have some mild scoring on the exhaust side of the piston and cylinder wall.
Anyway, my bigger problem right now is that (7) of the exhaust cover bolts and (3) of the bolts mounting the block to the lower unit broke off during disassembly. Successfully getting all 10 out has me concerned, so I am considering "plan B". I have a perfect 1967 Johnson 40hp. Is it possible to use the powerhead from that and bolt on all of the '58 parts? The two visible differences are the exhaust cover (no provision for fuel pump, but bolt pattern of the '58 cover is identical) and the head which doesn't have the compression release. Internally, I did find specs that the 40hp has a slightly larger bore.
Here are some picture of the boat and motor:
Anyway, my bigger problem right now is that (7) of the exhaust cover bolts and (3) of the bolts mounting the block to the lower unit broke off during disassembly. Successfully getting all 10 out has me concerned, so I am considering "plan B". I have a perfect 1967 Johnson 40hp. Is it possible to use the powerhead from that and bolt on all of the '58 parts? The two visible differences are the exhaust cover (no provision for fuel pump, but bolt pattern of the '58 cover is identical) and the head which doesn't have the compression release. Internally, I did find specs that the 40hp has a slightly larger bore.
Here are some picture of the boat and motor: