04 rmz 250 backfiring and spitting coolant

[dawson1120]

Hey guys, i just did a few repairs to my bike and put a new valve in because the last one was messed , i put the bike all back togethar made sure all my valve clearences are in spec. When i start up my bike it spits anti freeze out of the line at the bottom of my rad and also backfires at high rpm very loud pops, but idles fine so i dont think its a timing problem , i thought it would have been the head gasket causing both the problems so i replace it with a new one from the dealer and the same problem persists. any ideas on the anti freeze overflow? i feel it is causing the backfiring.

[FORMA MOTO]

Cam timing is off

[johnnyboy]

Doubt if its cam timing but worth looking at, Sounds more like a head gasket problem if its blowing coolant or on the worst side a cracked head.

[dawson1120]

Doubt if its cam timing but worth looking at, Sounds more like a head gasket problem if its blowing coolant or on the worst side a cracked head.

my head is cracked thats what happen befor i repaired it! the bucket smashed and blew a hole through that oil plug

[dawson1120]

Update: fixed the spitting coolant with new rad lid, no more backfiring when i retimed it, timing is still messed up