Athena YZ144 Kit - Big Bore Case Mods and Top End Install. Project YZ144 part 6

Here I modify my 125 cases for the 144 cylinder / piston, clean up the power valves and get the engine back in the bike.

[@MrJerry519]

Thanks for the heads up.

[@blakewalston5405]

We ordered one today should be here tomorrow so we will see

[@omicronomicron9613]

Do you think I could install a newer yz big bore kit (2005-2021) to a 1996 yz 125

[@keefer88]

Do you know if the process is the same for the 85 to 112 kit?

[@onthetrowel1895]

Is it worth it??

[@theblade4x464]

any issue of filling it with silicone instead of tape and playdo, once its dry just rip the whole lot out

[@Chris_Does_Everything]

Sounds like that would work but I have not tried it. Basically anything that will seal it up and then come back out without leaving a mess or working its way into the crank/bearings will do the trick.

[@intaniik5743]

Do you absoloutely have to do this??? I've been seeing a lot od videos of what seems like people not doing this, just putting the piston on and cylinder. ???

[@andrewcook7547]

On the Athena website it specifically says “This cylinder kit can be installed without making any changes to the engine crankcase.” I don’t know exactly why he cut that thing up😅

[@andrewcook7547]

Don’t listen to me I would 100 percent do this. after reading more closely you are required to. My mistake

[@atomlindsey7995]

What is the ring end gap supposed to be, I also put a big bore on my 125 but I think I made the gap way to big because it burns engine oil like crazy

[@rhyswatson9976]

My man twocstowks don’t have engine oil on top end

[@onenessseeker5683]

You most likely have bad crank seals

[@fishing4carp815]

Will it work if I return 125cc on moded 144cc case

[@Chris_Does_Everything]

Yes it will, no issues switching back and forth if you need to.

[@tylerraffensberger3756]

You didn't com up with shavings because aluminum isn't magnetic bud lol.

[@Chris_Does_Everything]

LOL is right! Not sure what I was thinking there, good catch!

[@onenessseeker5683]

144= blowout. pistons are very limited