I made my own tool for timing Saito cams - it's a 4mm rod with the enf ground down to 2mm diameter. Stick it into the bore for the intake tappet, it will engage the hole in the base circle of the intake cam and lock the cam from turning. Then with the crankshaft at TDC mount the cam and housing.

The gear teeth are coarse enough that you can see easily if the cam is off when using the tool.

HTH.

Bill.