yfz oil leak - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums

chewdogg · 02-03-2012, 12:54 PM

Hi everybody, new to this forum just jumped from bluetraxx where I got no help. anyhoo, my question is about my o5 which we just rebuilt the motor on top and bottom. New rings, new piston, head and jug machined, new valve stem seals, etc` etc. didn't skimp had it all done professionally but now on a cold start i have oil leaking from the head where the pipe goes in and it stops after it's warmed up. all I can figure are valve stem seals but I'm not mechanically gifted and was wondering if anyone had some other suggestions??

chewdogg · 02-17-2012, 02:20 PM

read somewhere that you're supposed to use new head bolts, which makes sense since they can stretch and bottom out, but was wondering if anyone else could weigh in on this?

dbettis20 · 02-17-2012, 10:15 PM

you probably need new head bolts and gasket on your exhaust

02-03-2012, 12:54 PM	#1 (permalink)
chewdogg Member Join Date: Feb 2012 Posts: 50	yfz oil leak Hi everybody, new to this forum just jumped from bluetraxx where I got no help. anyhoo, my question is about my o5 which we just rebuilt the motor on top and bottom. New rings, new piston, head and jug machined, new valve stem seals, etc` etc. didn't skimp had it all done professionally but now on a cold start i have oil leaking from the head where the pipe goes in and it stops after it's warmed up. all I can figure are valve stem seals but I'm not mechanically gifted and was wondering if anyone had some other suggestions??

02-17-2012, 02:20 PM	#2 (permalink)
chewdogg Member Join Date: Feb 2012 Posts: 50	read somewhere that you're supposed to use new head bolts, which makes sense since they can stretch and bottom out, but was wondering if anyone else could weigh in on this?

02-17-2012, 10:15 PM	#3 (permalink)
dbettis20 Junior Member Join Date: Feb 2012 Posts: 29	you probably need new head bolts and gasket on your exhaust

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