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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: pinhead on May 03, 2024, 08:56:59 PM
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My K100 won't idle when its warmed up. I have turned idle adjustment all the way up and doesn't help. Any suggestions what the problem could be?
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First thing I would look for is an air leak. The crankcase breather tube(AKA "Z" tube) or the bushings above and below the throttle bodies are usual culprits.
Another possibility is a faulty coolant temperature sensor.
There is information on how to check these items here at the forum.
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I changed the coolant temperature sensor a few weeks ago and no improvement. I replaced that z tube last fall. but no change .....
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My first guess is throttle body boot(s).
https://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/tbleak/tbleak.htm
Part 11611460408
They "only" cost $61 each these days and you want to replace all of them so you're looking at $244.
Would I pay that much? Not in a million years - because a I have both Swedish and Scottish genes trying to out-cheap each other.
The last K75 that I bought had a bad TB boot. I paid less than $30 shipped for a used set of three on Ebay - knowing that I could return them for free if I didn't like them. Turned out that they were in great shape so I gave them a 303 bath and installed them.
https://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/k75pa.rehab/k75parehab.htm#fuel.rail
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For boots try a company called siliconeintakes.com
Squirrel
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thanks all! I am going to do that propane test for leaks and see what happens.