bike 350F mathews
Pretty bike but unfortunately with some engine and other problems. Why the engine was disassembled to begin with. That's a broken off cam chain tensioner lockbolt. Engine out and disassembly commenced. Has a very noisy cam chain.
The lockbolt fixes this adjusting rod in place. Normally. Getting the crankcases split. Part of the cam chain tensioning mechanism visible with the bottom crankcase half off.
Another shot. Pretty unique. Only the Honda 360T shares this type of cam chain tensioning system. Lefting out the horseshoe. Oil pan shows the usual grunge.
Cam followers in good shape. Top end oil orifice in place. Pistons.
Cyliinder walls look suspicious. Someone has been in here honing. Not good. Sure enough, 0.0015 inch clearance, three times the assembled specification. Valves.
One was treated a little roughly. Exhaust valve showing unsealed guide, typical on these engines. Closeup of the exhaust valve guide.
And the intake valve guide for comparison. Note the cam lobe wear. Closeup. Less than 5,000 miles on this engine.
A tiny bit of recession visible, more on the intake of course. Upper crankcase prepared to go to bolt extraction service. Upper case back from repair and both halves cleaned, prepped and repainted.
New cam chain tensioner lockbolt and nut in place. Bottom end completed. Engine back in frame to ease remainder of assembly.
Attention turns now to the cylinder head. The funky exhaust valve guides have been changed out for sealing type. Head has been ultrasonically cleaned. Pretty, huh? Proper valve job completed.
OEM head gasket. Prepping it for placement. Cylinders bored for hard-to-find OEM pistons and rings. Note the factory ring compressors. Closeup of the factory ring compressors.
Cylinders on. Rest of the top end completed. Undoing some previously done electrical modifications.
Crimp connectors. Ugh! More. Now on to the carburetors. Buggered up choke plate screws.
Bent sync damping plates. Damaged bowl vent interconnecting hoses. Lot of sealer on bowl gasket surfaces.
More. More. On gaskets too.
O-rings probably from a kit, which means they were the wrong size and on top of that were not installed correctly. More. Same on float valve seats.
Slight corrosion, much less than sometimes is seen. Some of the threads were pulled. Put in steel inserts. The throttle shaft had been hammered on, dinging it up.
Almost done. Done, adjusted, leak tested and ready to put back on. All better now!