Honda NC50: Restoration and rebuild

Once I'd got the bike running I tried to ride it- and literally got nowhere. The bike refused to take up the drive load. Originally I'd interpreted this as clutch slip, but when I realised that the motor wasnt speeding up, I attributed the problem to a lack of power. Lack of power can come from a variety of causes- and most of them I seemed to have- potentially at least. Firstly lack of compression- my bike is pushing 70-80 psi and should be closer to 120psi. Luckily I did have the rebored barrel intended for the orange bike so I fitted that with its new piston. This pushed compression to 120psi cold- has this cured the problem? Will check later because.... The second likely cause of low power is a blocked exhaust- 2-strokes tend to gum up with carbon from unburnt oil in use. I don't know if mine is blocked or not- it doesn't seem so but unlike other bikes where the echaust comes apart for cleaning, this is a sealed unit and cant be checked inside. Accordingly I decided...

I hadnt meant to clean and sort out the tank since its my intention to sell this bike as a project... albeit a running one using a temporary fuel supply. However, forced to wait for parts, I needed something to do anyway. Removing the tank I started by removing the saddle... it tips forward on a hinge plate revealing 2 flange nuts beneath. The nuts come off showing the washers and rubber mountings beneath.  The hinge plate then lifts off with the mountings leaving the studs. I reattached the flange nuts for safe keeping. The tank is fixed at front and rear; the front of the tank is retained by a short m8 bolt each side.  Bolts removed The rear is held by 2 vertical studs accessed from below... their position is indicated here by my finger. The view beneath shows the nuts are screwed  onto long studs and need a deep 12mm socket to unscrew them. Tank then lifts off revealing ...

I have already removed the carb cover and detached the carb from the inlet manifold in the process of removing the motor. The air filter was missing on my bike anyway.The carb was now held only by the myriad of hose connections and the throttle cable. The carb has 5 connections and a drain hose. These are: Throttle cable Fuel in from tank Oil in from pump Mix out via autochoke Bystarter chamber hose Ive tried to show these below but access was tricky. View of carb connections. Breather hose- black rubber hose nearest at bottom of picture; Bystarter chamber hose connector... black plastic connector at top of carb; Fuel line in, brass angled connector; Oil line connector, metal elbow adjacent to breather tube Ive indicated some of these individually below. Breather hose Throttle cable and carb cap. Fuel mixture to bystarter chamber Mix out to cylinder via autochoke Oil in from pump Routing and disposition of all hoses shown ...