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400ex smokes out of Breather on valve cover


afa913

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If you put new rigs in and if you broke one you may be getting blow by causing too much crank case pressure. Most valve covers with a tune in it should have a hose on it and probably feeds back to the breather box. Check out parts schematics on line and see if there is a hose. If it does then you'll need it.

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Well, i found the breather tube that i tucked away up in the front of the plastic when i did the top end, i guess i just forgot about it,  Hooked it up and ran great with no smoke. Oil level was perfect and oil was nice and clean.  Also after the break in process had to adjust the valves again. They were loud as hell after about an hour of run time. Seems like everything is working as it should now..... Thanks everyone for the tips

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