Newbie Alert! 1974/5 460CR (I think)

..I'll pop the engine out of frame and remove the cylinder head this afternoon :-) Will post details in mo..

Hi there - thanks for this, do you know if the 460 (if that what mine is?) had a yellow tank? I thought there was just the standard husky look ..but rather fancy a yellow tank

Well look at that, it is 2046. I looked again and found no 2046. I did see a 74 400 SC has no number listed.
After some more searching the frame number indicates it's a 74 frame. Like said earlier in this post that it's a modified frame which thats what it looks like. And after checking a number of ID lists, the only 2046 I found was a 86 250. Obviously that motor is not an 86. It is the same as my 73 360. It would be nice to know what it actually is.

wouldn't life be dull if everything was simple! I've popped the head off and measured - its 83.84mm


Silly question (again) but the bike had two plugs and only on HT lead when I picked it up - is the second one for a decompression valve? many thanks @)

Compression release or spare spark plug. If you decide to install a compression release , make sure that it is a one way valve...exhale only. The cheaper compression releases are 2 way and should only be used for starting only. They will draw particles into cylinder if used for braking

It was common for desert racers to have dual plugs for quick switch should a plug foul. Maybe this was a Desert Master engine as they were 450's.

With 83mm piston size it could be a 360RT engine or 400CR/WR. That size would be an oversize for both engines

It looks like a modified 1973 460cr. I had one of these and Vic Eastwood did a suspension mod like this to the rear end. The 74 model had the shocks moved about 50mm further forward on the swinging arm but the top mounting was never altered from 72 through to 74 as standard. Bryan Wade rode a yellow tank version in 73.