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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: frankenduck on May 02, 2025, 09:06:13 PM

Title: K75 starts but only idles to about 750 RPM (Solved)
Post by: frankenduck on May 02, 2025, 09:06:13 PM

Reviving a K75RT that's been sitting for something like 15 years. Did all of the usual rehab stuff and was expecting to run right first time. Once the fuel system filled up it did start the first time but would only idle at 750 with the charge light still on and any gas or choke would kill it.

When I was swapping in a known good L-Jetronic I saw what I'd forgotten to replace - the crankcase breather hose. I have several on hand so I swapped in a new one and it fired right up and runs well.

I'm just posting this for someone who gets these symptoms and Googles for a solution.

More here:
https://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/ccb/ccb.htm

Title: Re: K75 starts but only idles to about 750 RPM (Solved)
Post by: The Mighty Gryphon on May 03, 2025, 01:50:47 AM

The infamous "Z" tube.