yz80d

I have a 1977 yz80d with a cracked cylinder head. I found a new cylinder head but its for a 1978 model. Does anyone know if the 1978 cylinder will fit on my 1977 model? Please help?

hello if you cleaned tank and carb your prob alright on that end. oil mix is 32 to 1. Check your reed valves. over time they get worn out and create this situation you have. mostly because they stay open and allow to much fuel then over time it eventually causes the bike to die after warm up