PNR 1 vs ZR 1

Author Message   Ernie Senior Member Username: ernie Post Number: 1411 Registered: 01-2002 Posted on Thursday, August 18, 2011 - 07:43 pm:        Look at the pics closely in the area below the water jacket The ZR is the one with the black flywheel rim. The PNR has a 1/2 inch smaller bore than the ZR Note the ZR has reliefs around the cylinder bolts where it bolts to the crankcase due to the bigger bore. Both the PNR and ZR cylinders are NOS a rare find to get one of them but 2 in the same shop at the same time Wow! The ZR I got in VT and the PNR Dick Day got in CT. The ZR has a counterweighted crankshaft but other than that and the piston/cylinder they used all of the same parts. In fact the PNR in the pic has a ZR head on it and the ZR has a PNR head. Why you say? Well just the way the parts landed in my shop. The engines in the background are Fuller and Johnson

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