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Cooling Systems Cooling Systems - Radiators, Water Pumps, Fans, Coolant, etc.


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July 15th, 2004, 04:43 AM   #1
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Overheated..

Last night I took the 'berg out for a quick ride only to end up pushing it home.

The bike only has about 8 hours on it and when I stopped along a trail to move a branch, the 'berg became engulfed in a cloud of steam.

I ended up pushing it home 3 miles or so thru the woods cursing the whole way.

When I finally got home (minus a few pints of blood due to some sweet mosquito bites) I checked the radiator only to find it empty. I had checked it the night before my ride and it was full.

After letting it cool down (me too) I drained the oil (which was fine - not "milky" at all) pressure washed the bike, refilled the radiator & started the bike w/o incident..1st kick.

No obvious signs of a leaking gasket.

I let it run for 5 minutes sitting and then rode it around the yard for 20 minutes or so with no problems.

So, any ideas what may be the culprit?

Thanks!
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July 15th, 2004, 04:57 AM   #2
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they had ignition trouble with them last yeqar and it shows in boiling-overheating. try calling SR off-road. mick knows all about it.

another way to see if it's head gasket is to start it with the lid off and look for tiny 'aero' bubbles.

Taffy
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July 15th, 2004, 02:26 PM   #3
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Thanks Taffy!
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July 15th, 2004, 09:43 PM   #4
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Try a new cap,preferably one with a
higher pressure rating.My berg gets
a little warm in the High mode,as long
as I run the ignition in low,it runs cool.
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July 17th, 2004, 06:42 AM   #5
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Well, after reflling the coolant the bike has been acting normally. No tell-tale bubbles or leaks. Ordering a new radiator cap & will call about the electrical next week. Right now, it's time for a ride!!

Thanks for your suggestions!!
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July 19th, 2004, 06:52 PM   #6
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My 501 used to get very hot while idling and riding slow technical trails. I richened the pilot jet and the overheating problems went away. I changed from a 35 to a 48 pilot. Check the topic posted about the dyno runs, he also went from a 35 to over fifty on his pilot. The bikes are excessively lean on the pilot as shipped from the factory.
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July 20th, 2004, 11:25 AM   #7
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these bikes run best with an N, P or Q needle straight. if you have overheating and you cured it with a far larger PJ then your needle straight is too lean (large) and you maybe ran an R or S?

but a 50 PJ is wrong!

Taffy
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July 20th, 2004, 04:43 PM   #8
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My midrange or half throttle performance was fine. Definitely not too lean on the needle or needle jet. In fact, with the stock pilot jet, I couldn't get the engine to run rough by turning out the idle mixture screw. The pilot was too lean. Now the pilot is a little rich, but our ambient is 112F in the shade. The bike runs great, the idle screw is 1/4 turn out. When the temps drop to the 90's, I will be right on with this pilot.

You can't argue with the dyno charts and Oxygen analyzer chart. He was over 17:1 with his 38 pilot. Way too lean. He posted that he changed to a 50 something pilot and his engine runs great.

Keep in mind, on your side of the pond, the humidity is much more a factor. Damp weather requires a leaner jet due to moisture displacing the oxygen. What's your elevation, Taffy?
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July 21st, 2004, 03:46 AM   #9
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Keep an eye on your water pump seal. Mine had a very slight leak.
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July 21st, 2004, 09:07 AM   #10
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Taffy

Can you elaborate about the ignition trouble. Our bikes genarally always boil at this time of year, mostly due to altitude, load, ground speed (or lack of it) ambient temp and humidity. We work them hard in tight trees up high, so the resulting low speeds while working the engine generates huge heat, boiling the fuel even. The fuel gets hot despite covering the bottom of the tank with furnace tape.

My bike was a used demo, 2003 fe 501e which was raced last year Dan Watt. He had trouble with it boiling during a race when it shouldn't have. The cap was faulty. But he claims for as hard as he worked the bike and when he returned home to find the cooling system dry, you cannot heat seize these engines. At least in enduro situations anyway. I will attest to this as on Sat we had a nasty high alt ride where problably 30 or our 45 km ride were ran with little or no coolant.

I am curious what your thoughts were on the ignition causes.

fryguy
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