What is the correct tank colour for a 77 CR? I thought red, mine is black..
The correct colour is the purple for the 390, as shown on Slakewell's bike and red for the 250. Are you sure you have the correct frame and not a '76 CR, or even a '77 WR frame ? On the '77 CR250 and 390 frame, the top shock mount plates face upwards to allow for longer shocks. On the '76 CR and '77 WR frames , the top shock mounts face downwards and use shorter shocks. The frame number will also tell you what it is. From memory a '77 CR390 will have a frame number between the range of ML16000 to ML22000, but I'd have to look up my numbers to check that. It does sound like you have a '78 pipe though, which I think is a good thing.
I may have to ask you some questions about KX250 A5 shocks, as I want to replace the standard ones on mine with something better. I may also have another KX A5 project in the wings
. I measured the standard KX shocks at 420mm eye to eye, with around 150mm shaft travel. I have a set of piggyback Ohlins from an '82 CR Husky, that are about 420mm long with 140mm shaft travel and a set of 420mm long Fox piggybacks somewhere. I just have to find the Fox piggybacks to measure the shaft travel, but I did have those shocks put aside to go on my Can Am MX6 250, when I get around to it. Will the Ohlins off the Husky do the job and will the shim stacks need changing much to suit the KX ? Or am I just better off buying a new set of Ohlins set up for the KX, with the correct shaft travel length? I might also PM you to ask how much the fibreglass tank on your A5 cost from Mr. Holley.