"220030" is quite an early Mk V serial number (220000-on), apparently some 22xxxx numbered bikes were sent to the USA which have earlier date stamps, but higher serial numbers than yours? Those early 22xxxx machines are officially unknown as far as the production records are concerned, the official start date for Mk V production being March 1973 from serial number 220000.
Thanks! Thats all great info. How do I tell if its a combat engine? The fins are about 1/2 as close between the cylinders and the head, compared to the fin spacing on the barrels. I dont see a C stamped on the head but I dont know where to look.
Originally posted by TBolt72: How do I tell if its a combat engine?
As it's a Mk V model, then it is unlikely to have a Combat spec. engine.
Originally posted by TBolt72: The fins are about 1/2 as close between the cylinders and the head, compared to the fin spacing on the barrels. I dont see a C stamped on the head but I dont know where to look.
The narrower head/barrel joint fin spacing would be normal. A Combat head normally has the "C" stamped on the top of the head at the point where the two exhaust rocker housings come together, and the head steady will probably have to be removed to see it, -if it is there, but there probably isn't going to be any C stamp on your Mk V cylinder head?
There were two versions of the MkV 750, Hi compression and lo compression. Most sold in the US seem to be the hi comprssion variety. The hi compression (9.3:1) cylnder head will be stamped RH6 while the lo compression is stamped (8.9:1) is stamped RH5. The MkV had 32mm intake ports, the 5 plate clutch, and the standard (non-combat) cam. I have two of those "mysterious" pre-March '73 models. Both built in Nov. '72 and both with serial numbers higher than yours. Go figure!
I checked out the head and I can see H 6, so Im supposing its and RH6 head. Its got a front disc brake but I cant tell what size the carbs are, no numbers on them. From what Im reading about Combat engines, Im glad I dont have one. Im really looking forward to reassembling this bike and riding it. Its only got 5000 miles on it, so hopefully it wont need too much machine work. How do I get a look at the cam to see what numbers are on it?