Air cooled engine temperature
Discussion
If everything is working normally the internal temperatures shouldn't be much different from a water cooled engine. Circa 100C for the bores. The oil temperature is probably the most important thing. You don't want that going above 110C and ideally under 100C. 130C is danger territory.
I wouldn't fret about it to be honest. Just run it in normally.
I wouldn't fret about it to be honest. Just run it in normally.
Thanks Dave!,
At the beginning of the running in I saw 110-115 degrees on the cylinder head, and at the plug area. Now I can see 100-105, but with outside tepmperature at 0-5 degrees (yes it is a bike, me myself tend to feel overcooled after a very short time :-) ).
I never ran in aircooled engine, I am experimenting on this bike before I build something much bigger and much more costy :-).
At the beginning of the running in I saw 110-115 degrees on the cylinder head, and at the plug area. Now I can see 100-105, but with outside tepmperature at 0-5 degrees (yes it is a bike, me myself tend to feel overcooled after a very short time :-) ).
I never ran in aircooled engine, I am experimenting on this bike before I build something much bigger and much more costy :-).
How are you doing anyway young Padawan? Haven't seen you on here for a long time. I assume you've now got your boring and honing finishes for cylinder bores properly sorted out after the long thread we had a few years ago to help you sort out your Mini engine.
You'd like my new house in Scotland compared to the horrible place you visited in England when you came to see me. 4 bedroom modern bungalow, in the middle of nowhere down a farm track. 33 ft x 20 ft garage/workshop with mezzanine floor above for storage. My chicken lives in the garage and gives me an egg a day. She sleeps in an old tyre filled with straw. I had three but foxes took two of them. I couldn't eat three eggs a day anyway though.
You'd like my new house in Scotland compared to the horrible place you visited in England when you came to see me. 4 bedroom modern bungalow, in the middle of nowhere down a farm track. 33 ft x 20 ft garage/workshop with mezzanine floor above for storage. My chicken lives in the garage and gives me an egg a day. She sleeps in an old tyre filled with straw. I had three but foxes took two of them. I couldn't eat three eggs a day anyway though.
Thanks Dave, I am feeling statisfied with the way life goes. After our very good learning session 
on thoose Mini engine, I did not have any misserable experiences with engines. I am doing the same as a few years ago, although on some more complicated and more expensive cars and of course this little Yamaha, but this is my runabout/victim for learning how to live with/modify injected systems.
on thoose Mini engine, I did not have any misserable experiences with engines. I am doing the same as a few years ago, although on some more complicated and more expensive cars and of course this little Yamaha, but this is my runabout/victim for learning how to live with/modify injected systems.No.
Finally I could contact a guy from the piston manufacturers, who showed me the original drawings and the factory recommendations for the piston (4thou clearance), and told me that this is the official factory and manufacturer recommendation. But he also shared me his opinion as a engineer, and after that we decided to go for a weak 3thou (0.065-0.07mms). The engine was not yet assembled, soo I dont know if it was a good decision or not - yet :-).
Finally I could contact a guy from the piston manufacturers, who showed me the original drawings and the factory recommendations for the piston (4thou clearance), and told me that this is the official factory and manufacturer recommendation. But he also shared me his opinion as a engineer, and after that we decided to go for a weak 3thou (0.065-0.07mms). The engine was not yet assembled, soo I dont know if it was a good decision or not - yet :-).
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