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View Full Version : Old school air cool decomp valve?



rooster1
10-29-2013, 08:14 PM
I just received a new to me head for my 83 CR480. I have the engine installed on a 84 250R frame. The mount on the head cracked, you can see the pictures on my 480 thread. I have done some research on vintage MX forums about installing a decompression valve on these big bore motors and it seems like it can be done, but I am just not getting very far. Has anyone done this on a similar project or know someone who can/does? 179865179866

UPDATE! it can be done according to my local shop. Im siked