Posts
32
Joined
12/28/2024
Location
Modesto, CA, USA
Edited Date/Time
6/29/2025 7:26pm
I’m tired of listening to people tell me to run 927 or k2, so before I chose which I’m gonna run I wanna hear other people’s opinions on what oil will be best in a yz125 that gets a mix of moto and woods. When I run woods and moto I do ride the bike pretty hard in the high to mid rpm majority of the time. Also I would like to run top ends for 80-100 hours…
Ratio and jetting is 10x more important than the oil. Even low end oils are still decent these days. 927 will smell better but good luck cleaning the powervalves, especially with a top end interval of 80-100 hours.
Top amateur kid on a supermini, I’d give the nod to 927. But I bet the kawi kids are still on k2 these days, as the oil wouldn’t be the reason for a failure
80-100 hours on a 125 top end doesn't sound like a good idea...
Motul 800 in mine at 32:1. Came from using 927 and it wasn't as messy as some claim, but I'm going to stick with Motul.
I’ve done it many times with forged pistons. Never had a failure.
I do rings every 40 hours so that would allow me to clean up power valves
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What is the difference in 927 & k2 ? The price is crazy high. I run Klotz techno plate I think it’s called , it smells great. My plating has the piston tolerance Very tight. I was thinking 20 hrs on piston & re ring at 10 hrs. If the weather would cooperate I can ride . Depending on how it pulls I might increase the hrs by 5.
20 hours??? That’s crazy low hour for a forged piston.
Klotz R50
That depends on hard you beat on the bike, I change 125 pistons every 10-12 hours but its different for everyone. Also to answer the other question we use K2 and have had good luck with it so far, Powervalves look clean every time the cylinder comes apart.
Bought a 24 kx250 and was wondering if someone makes a air box plug that goes in the side panel so when I power wash I don’t get water in the air box. Sick of taping up the opening all the time and cleaning off the tape residue. Make sense? Filter doesn’t get dirty enough sometimes to remove and twin air box cover the whole thing remove side panel etc. or any other ideas I’m open to.
K2. It's a synthetic and burns far cleaner. 927 smells awesome, but for a post-'70s 2-stroke with power valves, you'll do better with the synthetic oils, long-term.
Post a reply to: 927 VS K2 what’s better for a 125?