250-500cc Wr 250 engine problems! Any ideas

Lankydoug that's an interesting one thanks I'll check that as well. Even if it's not causing it I want to eliminate it as a future problem :-)

Cheers Huskynoobee

It's Fixed I took a punt on the second hand head and it is all good now so it must have been a crack in the head! Hasn't used a drop simceThanks to all who contributed ideas.
I idled it to 80 deg on the head (would start pumping it out at 75) and not a drop then rode my test loop - previously would loose about 500 ml on the loop which has a couple of kms of tar some singletrack and then a little open stuff and again not a drop! Yippee Just need to get some time for a decent ride! My wife wants me to sell it she reckons it's the land rover of the motorbike world but it now has a top end done new water pump bearings and seals and it's got the vapour speedo with temp gauge so I reckon it should be all good
Thanks again guys

Cheers Huskynoobie

well done bud, im happy for you she's up and running