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https://thumpertalk.com/forums/topic/1179771-how-often-to-change-rings-rebuild-on-yz-125/
I have seen 20 hour 125s and 40 hour 250s have less than 10% drop in compression but still need rings. I think you will find that for the average guy on a 125 you will need rings at 20 and piston/rings at 40. You might be able to squeeze 25 and 50 out of it but you already know 30 doesn't work in any way. Start a log.
https://thumpertalk.com/forums/topic/547261-yz-125-how-many-hours-of-riding-before-top-end-should-be-changed/
If the factory is recommending 10 hours and you want to stretch it to 20, you might have a point. If you try and push it to 40, you might get there, but if you dont it could get expensive. A top end is not cheap.
https://www.youtube.com/watch?v=Q8OpVEs7lv4
Hey guys, this is my $800 dirt bike 2001 Yamaha YZ125 which I rebuilt (for the most part), it took a few months to finish up. I have a few videos on the chan...
https://www.youtube.com/watch?v=sdlhDxcbGHQ
Watch this 2007 YZ125 go through a complete rebuild, from frame to completion you can see every part and step we went through to make it a sick revamped ride...
http://www.allthingsmoto.com/forums/f-28/how-often-do-you-rebuild-your-2-stroke-49236/
As you can imagine the hours are clocking up on that rebuild pretty quickly. Eric Gorr says the 125 two strokes need new bottom ends every 80 hours. I think I'll go through 80 hours within the next year or two! But I can deal with that, whatever. But my service manual says i need to replace the piston every 7.5 hours.
https://dirtbikemagazine.com/two-stroke-tuesday-faster-usa-2006-yz125-rebuild/
A 2006 Yamaha YZ125 project from Faster USA is our main focus on this week’s Two-Stroke Tuesday brought to you by Boyesen. We feature products from Regina Chains and DP-Brakes in the 2-Stroke Hardware section and don’t worry 2-Stroke Theater is packed with project bikes and OEM first impressions of premix burning machines for your viewing enjoyment.
https://www.motowrenchers.com/yz-125-complete-rebuild/
Finally it’s time, the Yamaha YZ 125 is ready to be reassembled! After 34 hours of work – disassembling, cleaning and organizing – the worn
https://www.motowrenchers.com/yamaha-yz-125-rebuild-part-1/
Yamaha YZ 125 Rebuild Part 1. Finally it’s time, the Yamaha YZ 125 is ready to be reassembled! After 34 hours of work – disassembling, cleaning and organizing – the worn parts can finally be replaced and the YZ rebuilt. I am really curious how the project will develop.
https://www.vitalmx.com/forums/Race-Shop,42/My-2005-YZ125-rebuild,1232736
2/5/2012 10:35 PM. Edited Date/Time: 2/5/2012 10:39 PM. On my 2005 Yz 125, it wasnt the shift lever that was the problem, it was hte shift bearing (not sure of the exact name) but on the 2005's, it is a ball bearing and in mine, the balls in the bearing got lose in the motor and you can guess what happened from there. but I would recommend ...
https://www.dirtrider.com/features/two-stroke-rebuild/
Put enough hours on a 2 stroke engine and something will let go. For this Yamaha YZ250 motor, it was the crank after 250 hard hours. For this Yamaha YZ250 motor, it was the crank after 250 hard hours.
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