2003 Yamaha 115 2 stroke cold cylinder head

[fshndad]

The Right cylinder bank is not warming up. I let it run on the flusher for 15 mins. I swapped t-stats from the other bank and no difference. I removed both t-stats and cover and do see water is coming up to the t-stat. Could there be an issue with my Head gasket? Anyone have a water flow diagram?

I removed the Poppet valve and spring. I did not see any thing holding that open. all seems clear there.

 

[rowboater]

It was explained to me that when running on "muffs" you do not always get the same results as normal in the water operation.I had a similiar issue on an outboard and replaced the poppet valve although It looked fine.I replaced the valve before running it in the water so not really sure if this was a actual problem or a result of running it on muffs.Ever since then I will feel the thermosta/water jacket and compare temps,when on "muffs" but tend not to be concerned about it since they are somewhat within the samp temp range.The few times I pulled the cowling off when in the water the temps always seem similiar.The other indicator would be how hot the water is coming from the pee hole.If possible I would run it in the water and see if you still have the same problem.

 

[fshndad]

RowBoater, the left side warms up a bit, but the right side does not at all. It stays cold.

Does anyone else here have a 115 or 130 yamaha and can tell me if their heads run even temps when on the muffs????