Heating issues

[grantl]

bike CBR 250r

bike runs fine, *however* seems to have an over heating issue,

i have followed the guide on flushing the radiator didn't help that much.

the thing that iam most concerned about is this when crusing on the freeway around 100-140 speed it seems to get worse. To the point where i have to have a time out and let the bike cool down some what. ( i thought on the freeway would over best chance of cooling down due to increased airflow.)

any ideas as to what the problem may be?
and how i can go about fixing it.

[alains]

take off the thermostat , then run for a while . if you go fine then buy a new one . it's not necessary to change the seal , just put some loctite .
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the worst day fishing is better than the best day working

[stinkwheel]

Try the thermostat thing but you may find that the head gasket is blowing and pressurising the coolant system, this is a fault that tends to show itself at higher rev speeds.

When it overheats, stop and quickly check the level in the expansion bottle, if it has filled up the bottle with coolant (possibly even overflowing), I would be very suspicious of the head gasket. You fix this by replacing it, which is a pain in the arse.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Finglonga]

[grantl]

[grantl]

[Finglonga]

Sounds like that

You may also find your coolant is turning darker also wich also points to head gasket.
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Andy Sez....
F.Y.Y.F.F.