CRF Getting Hot!

K

KTMDan

Member

Mar 23, 2001

31

0

• Oct 18, 2002

• #1

My 03' CRF gets hot and starts boiling over if I let it sit and idle too long. After about 5-8 minutes of just idling antifreeze starts running out of the overflow tube. Anyone else having this problem. First 4-stroke I ever own, is this normal?

 

Rich Rohrich

Moderator / BioHazard

LIFETIME SPONSOR

Jul 27, 1999

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• Oct 18, 2002

• #2

Race engines are not designed to sit and idle for 5-8 minutes. The cooling system is designed to be as small and light as possible so it gets hot fast if there isn't air moving through the radiators, not to mention idling is really hard on the valve train.

So yes it's normal, and it's best to avoid idling the engine for extended periods.

 

K

KTMDan

Member

Mar 23, 2001

31

0

• Oct 18, 2002

• Thread starter
• #3

Thanks Rich! That makes sense and I was thinking the same thing. How long should I let it warm up for then. My old 2 stroke would take about 5 minutes to warm up. I this too long?

 

Rich Rohrich

Moderator / BioHazard

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Jul 27, 1999

22,839

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• Oct 18, 2002

• #4

These bikes warm up fairly quickly. Give it a minute or so and ride it easy for the first couple of minutes to give the piston and barrel a chance to expand properly.

 

B

Boozer

Member

Oct 5, 2001

351

0

• Oct 19, 2002

• #5

Originally posted by Rich Rohrich
not to mention idling is really hard on the valve train.

Click to expand...

can you please tell me more about this?