Hot WR – OLD Bull Trailriders

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January 14, 2011 at 12:33 am #99431

Ron Birrell
Member

I sometimes ride with a bloke who uses his son’s 2004 wr 450.
We were riding some tight singles before christmas when the
bike started to over heat. WE let the bike cool down before we
refilled the radiator with water out of my camelback and we had
no more problems for the rest of the day and so I thought his coolant
level was a bit low to start with.
I was talking to him today about going for a ride this weekend
when he said that the bike was still over heating and his son had read on
the internet that if he re-jetted the bike that would solve his problem,
which he intends to do this afternoon.
I told him that I had never heard of this and that they should look at
the grills of the radiators for cleanliness first and if that was okay
then change the type of coolant used or run an over flow tank.
They bought the bike second hand and so have no knowledge of it’s history.
Any hints or thoughts would be great

Buzz

January 14, 2011 at 2:02 am #194601

Matt Baker
Member

I had the exact same problem on my KTM, it turned out that all I needed was a new radiator cap, $15 and I haven’t had a problem since.

January 14, 2011 at 3:30 am #194606

Ron Birrell
Member

Thanks LC, I didn’t think of that.
I had the same problem with the truck some time ago.
I’ll pass it on.

January 14, 2011 at 3:34 am #194612

Matt Baker
Member

Check the thermostat too, put it in a saucepan of water and bring to the boil, if its not rooted it should open when it gets close to boiling

January 14, 2011 at 3:55 am #194602

Ron Birrell
Member

I better start writing this down. I find it pretty hard to walk and breathe at the same time :laugh: :laugh: :laugh: :laugh:

January 14, 2011 at 4:07 am #194603

Scott Tyszkiewicz
Member

If the jetting is to lean the bike will run hot.
But i would check the other things out fist like the cap, thermostat, blockages and run a good coolant like Engine ice or liquid intelligence.

January 14, 2011 at 4:44 am #194607

Roy
Member

LC4skin wrote:

Quote:

I had the exact same problem on my KTM, it turned out that all I needed was a new radiator cap, $15 and I haven’t had a problem since.

LC, my cap was similar. It was actually bubbling out the top not the overflow. I bent the tabs up a bit and it has made it better but not totally fixed. It is also short term as the tabs will obviously bend back in time.

Did you buy the same pressure cap or did you go from the 1.4 to 1.8 bar cap.

January 14, 2011 at 5:07 am #194617

Matt Baker
Member

I just got a 1.4

January 14, 2011 at 5:23 am #194604

Jason Anderson
Member

Ha Buzz. Check the fins like you said. If they are bent you can use a tooth pick to straighten them. That’s the easiest way I found because the sharp bit will get in and not damage anything. Check your cap then flush your coolant and put new water and coolant in. It should have an overflow bottle on it. I would try this first.
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