Maintenance & Technical > KX500 Original

over heating and boil over????

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fast500#12:
:cry: i have put two new top ends in my bike in the past 6 months because of over heating and melting pistons? the bike runs great no water leaks 32:1 mix 10w40 in the gear box. i have changed the radiator cap twice because they fail pressure tests and the new one is good. but now i have melted piston number three. does any one have any sugustions. i am going to change my gear oil to maxima 85. i ride in sand and what ever else comes along. i am getting frustrated and constantly putting new piston kits in is getting spendy please help. :?:

Paul:
Is your water pump frozen solid? I race during the heat of summer (110+) in the Arizona desert @ speeds over 110 (15/42 gearing) and have NEVER melted a piston. I change radiator caps when I put a new topend in, and I run Maxima Coolanol. I race with 40:1, Super M and Sunoco Purple (111 Octane). Thats also the same mixture I use @ Glamis.

kawdude:
My bike is a piece of crap (or was before the rebuild) and I screamed the engine the last couple time I rode it before tearing it down.  Would plugged radiator core cause this?  How about Timing, air leak, spark plug???

fast500#12:
:x i don't think so because i had a loose hose once and it shot a good stream. but i'll check any way since i tore it down to bare frame for paint. and the top end is off. the bike is going to look very sweet when done, i may post some pics. thanks for the info paul.

Paul:
Welcome, a good thing was brought up by kawdude - how are your radiator cores?

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