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Any update on your project Chrisraven? I took the head and cylinder block along with the #1 piston to an engine machine shop a couple of weeks ago. It is the same shop where they did all the machining in 2021 during the last overhaul. I just wanted to hear their opinion on the parts and the...

After the engine overhaul the bike has been sitting only during winter months, which is typically 6-7 months a year up here. Other than that it has been on the road for some hundreds of miles every summer. But anyways, I have now removed the cylinder head and cylinder block for examination and...

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US models have accelerator pumps, right? European models don't have the pumps and I've understood it is because of different emission standards, which required bikes sold in the US to be adjusted leaner than the ones in Europe. Overall leaner adjustment caused problems in acceleration, so the...

Thank you again for taking the time to comment and help, it is highly appreciated! Cylinder block installation went ok. This was the second time I did that for this engine and I remember the first time ca. 20 years ago was more of a pain, and I managed to break one of the new piston rings, so...

I think the rebuild set I used was non-genuine, i.e. non-Keihin. I got it from Ebay if I remember correctly. But this was years before the engine rebuild, hence years before the soot problam started. I also swapped all these parts from #1 to #2 carburetor when troubleshooting, but the problem...

I checked the valve clearances as one of the first things I did after trying out all the ignition part swapping. All clearances were within factory tolerances. But I could check them again to see if anything has changed, especially clearances in cyl #1. It's been a while since the check and I...

Thanks for the tip! However, spark plugs have been totally renewed once in the process of troubleshooting, and Iforgot to mention that after the renewal I've swapped the plugs several times between cylinders, so that actually I think all four of them have been in cylinder #1, and they all...

Hello all This is my first post in the forum, but have been an occasional reader for some years now. I have a 1982 CB750K DOHC European version (i.e. without acceleration pump in the carbs, but otherwise same mechanics as in the American version, as far as I know). The problem is cylinder 1...