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I'm not an expert but those grooves look severe. I wonder if the piston broke a ring or something. Is it the same on both pistons? Can these engines be machined and cylinder walls sleeved or do you just have to replace the cylinders?
 

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Depending on how deep the grooves are, cylinders could be repaired like at Millennium Technologies in US and Honda has + 0.25 pistons and rings available for CRF1000 at least, if necessary. Certainly cheaper than new crankcases but definitely not an inexpensive rebuild.
 

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Must of been a Monday hangover bike. I’m hoping it’s under warranty. Good pics and a good shop it looks like. Hope they take care of you.
 

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Depending on how deep the grooves are, cylinders could be repaired like at Millennium Technologies in US and Honda has + 0.25 pistons and rings available for CRF1000 at least, if necessary. Certainly cheaper than new crankcases but definitely not an inexpensive rebuild.
I wonder how one rescues ceramic-treated cylinders after a boring job?
 

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R & R. Remove and replace at any cost. Welcome to 2022
 

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Is this a CRF1000 or CRF1100? The cylinders are different designs. The CRF1000 has a steel liner bore and the CRF1100 is a hard coated bore similar to Nikasil. The cylinder scouring looks like a typical over heating situation where the piston outgrows the cylinder or a low oil partial seizure. If not under warranty and it is a CRF1000 it can easily be bored if oversize pistons are available. It looks like a .25 mm overbore will clean this up. I have a cylinder boring machine and have bored thousands of motorcycle cylinders over the last 40 years.
 

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Discussion Starter · #14 ·
I'm not an expert but those grooves look severe. I wonder if the piston broke a ring or something. Is it the same on both pistons? Can these engines be machined and cylinder walls sleeved or do you just have to replace the cylinders?
The motor is running, just eating oil. It is not yet known what the officers will do.
 

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Discussion Starter · #16 ·
Is this a CRF1000 or CRF1100? The cylinders are different designs. The CRF1000 has a steel liner bore and the CRF1100 is a hard coated bore similar to Nikasil. The cylinder scouring looks like a typical over heating situation where the piston outgrows the cylinder or a low oil partial seizure. If not under warranty and it is a CRF1000 it can easily be bored if oversize pistons are available. It looks like a .25 mm overbore will clean this up. I have a cylinder boring machine and have bored thousands of motorcycle cylinders over the last 40 years.
Honda CRF 1100 2021
 
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