Question about 2005 Yamaha FJR 1300

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Engine temp guage runs half way while riding

I have had the sender unit changed twice and the guage still runs at half way while riding, im told this is ok, but sometimes it runs on 4 bars just over 1/4 hot, is something wrong or is it ok. The engine doesnt feel hot while im riding

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That sounds ok, it would be more of a problem if it went over half sometimes. The only other things that may make it flucuate could be a sticky thermostat or an air lock somewhere in the hoses, but these generally cause overheating. At half way it is not overheating.

Posted on May 02, 2010

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the dash guage is but a toy and not and instrument.
if fact it has no numbers on it, no 180F. markes
the gauge is reading hot because the 1 pin 1 wire, sender wire
for the gauge is grounded out, remove this wire from sender
and the guage, must go to low.
btw here is the G16 being gauged, FULL HOT.
the gauge and sender tests are in the FSM. read that.

here is the G16
the no num gauge.
here is the best way to measure engine heat.

see how well the RAD works, see this. big drop !

on the G16, we test the guage like his.
yours is near identical.

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You may have a bad guage. To check, ground out the sender by placing a screwdriver or alligator clips accross the ground tab and the center positive terninal. If the guage works you would normally expect a sender problem, but since you put on a new sender (assuming it's wired correctly [ no offense ]) you will need to trace t the wires from the guage to the SU. The fuel guage power lead is pink ( or at least it is on boats ) Look for a bad connection, corrosion, frayed wires or anything else that looks abnormal. You may want to simply replace the existing wire temporarily with another wire. This new wire should tell you immediately if your guage is bad. Good luck!

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Temp guage runs half way

Does it remain between 3 and 4 all the time not higher? If yes, then you can say it is normal as long it remain about half way distance between "c" and "h" indicators. Good enough?

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My guage runs half way whike riding and climbs up to 3/4 some times is this usual the other day it went up to the light comming on.

it should sit around half, may get to 3\4 on a hot day riding hard, but should not get to light on stage.
Check the fan comes on when it gets hot
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Change coolant\flush radiator
Check for leaks
pressure test coolant system

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