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If your reading 4 bars and the fan cycles then your sending unit probably is not working as it should.
The Aspy should read 8 when the fan turns on if it goes to the 9th, switch the engine off and investigate :)
If the fan cycles on and off then the system is working.

Yes they get hot.

I have an after market sender and temperature gauge, the engine runs about 190+ when riding on the highway, in town will hit 210+ then the fan comes on and it will cycle on and off till I am on the open road again.
 

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I follow the Honda manual for filling the rad, have done it like that innumerable times.

Fill rad,with 50/50 Start engine with rad cap OFF run until there are no bubbles in the coolant and the coolant level stabilizes.
Stop engine, fill rad to correct level, replace rad cap. fill the reserve tank and fill to correct level if low.

Check for leaks.

If you are getting lots of bubbles in the coolant then you could have a head gasket failure.
 
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