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Originally Posted by Bbogie
While doing other work to my 98 Adventurer with 25,000 miles on it, I rejetted the carbs for the altitude here. I went from the stock 98 to 92.5 and 1 3/4 turns on the standard pilots. It had been running rich with very black exhausts and black plugs. Additionally it has TORs but with some baffles in the pipes. I also replaced the filter with a new K&N. Otherwise standard. It seems to run well, idles well, plenty of power. But, I have noticed that with 100 miles on it the pipes are bluing a lot more. So far, down to the screws, but very dark blue at the engine. I'm worrying about burning valves. Should I go to a 95 jet or back to a 98 before I damage the valves?
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I'd try a #95 and see if the bluing continues to spread. What's the altitude there and I'll calculate what jet would be appropriate?
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Also is there any way to test if the temp light is working and the fan is operational? Neither has ever come on, but I've only ridden this thing 250 miles in the cool weather since I bought it.
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The temp light sensor is located on the left of the engine just behind the water pipe. You can test the light circuit by connecting a jumper wire to the sensor wire and shorting it to ground. That will turn on the temp light if it's working properly.
To test the sensor you need to measure the resistance. It's either 5000 or 10000 ohms (don't remember which) when cold and under 100 ohms if you dip it in boiling water.
To test the fan, disconnect the plug from the fan switch (located on the right side of the coolant reservoir under the fuel tank) and short across the contacts in the connector. That should start the fan running. If it doesn't run, check for gravel/leaves, etc. inside the fan shroud.
To test the fan switch you need to check the resistance cold (infinity) and when hot (dipped in boiling water). When hot the resistance should be about zero.
Jim