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.

[@sludge86]

Awesome. Thanks for the step by step 👍

[@blakewalston5405]

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

[@MrJerry519]

Thanks for the heads up.

[@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

[@vgones69]

Gracias!! también sirve para mi gas gas ec 2003 soludos desde España

[@omicronomicron9613]

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

[@onthetrowel1895]

Is it worth it??

[@Nelsonmccallum27]

How’s the yz144 still running. I just bought that kit and I’m debating splitting the cases or just doing what you’re doing.

[@Chris_Does_Everything]

Running strong! If you saw the other videos in this series the one piece that was questionable in the build was the old 36mm carb. The slide is shot and the body is just worn so I recently bought new TMX38 and the parts to make that fit, so look for a follow up video soon. From an installation perspective on the kit, if you got the crank like I did just do it while you have the cases split. I missed that step when I did the bottom end which is why I ended up doing it like I did. The end result will be fine either way, just be careful.

[@keefer88]

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

[@christophbarthel6542]

is the athena cylinder reliable ?

[@Chris_Does_Everything]

I can't say as I only have a few hours on the bike. Will post an update when I need to do the top end.

[@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

[@boxhead1481]

Ù​@@rhyswatson9976

[@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!

[@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.

[@onenessseeker5683]

144= blowout. pistons are very limited