2020 YZ250 smoker dream build full send :)

Thanks Nail, I’ll shoot you an email. I think I got some parts from you off Barcia or Stewie’s bikes a while back 😎

GU - you mean something like this:

I think I may have been one of the first to get them as I jumped on these quick from ya. Thanks for making them👍🏻

Thanks CS271, I am ready to FINALLY get on this.

Zesiger, I hear ya man 🤣 Maybe we can motivate each other. BTW I think I need to txt you again for the specs of that axle as I can’t find my notes where I wrote them down but I think I may have packed it away with the titanium bar so I would have it when ready.

Thank you both for the positive support 😎

I am still waiting for a few things to show up before I fully rip into this one so I decided to play with & test out my new cerakote setup. I am also in the process of rebuilding my 2006 Yz250 so while it is all apart I coated the head & piston dome then put an anti friction coating on the skirts. I had a used Wiseco that was in great shape but had a little bit of wear around the window & exhaust so it was a perfect candidate for a test trial. It felt a little weird scuffing up the head & dome so the cerakote would stick but I understand why it had to be done. Overall I am very pleased the way it turned out so I want to have it back together & fired this weekend.

While waiting for the cerakote to dry I was bored & decided to modify one of my PC shorty silencers.
Cleaned
Polished
Drilled
Heated tip for bluing 😎
I’ll use this one on my 2011 yz250. The 2020 will get the Ti2

???

Hey guys,
Deccr250 is pretty much on point (thank you sir!) but lets expand on it just a little bit more.

First & foremost this is not standard Cerakote used to color your gun & protect it from rusting. This particular stuff I am using is a high temp ceramic formulation specifically designed for engine & piston coating. The technology started off in the 70's, gained some traction in racing in the 80's, then the industrial market really got into it in the 90's (this is the field I operate in) & away we go. As time has progressed the formulations & applications have gotten better & easier. Then a lil company called NIC Industries made the Cerakote coating a household name for “special coatings” just like roller blades & Band Aids did.
Now as for how all this pertains to 2 strokes... We all know that these single cylinder air pumps we all love so much run best right on the ragged edge of "lean". In 2 stroke race engines a lot of guys want to be right on the edge of a lean condition. That’s where the most horsepower is available but it is riding a fine line. A lean mixture runs hotter and if the fuel mixture is set correctly for a fully hot engine, you’ll get full power at full working temps. However, most of us are not professional tuners with professional equipment necessary to check & monitor EGT so we typically run the risk of it being too lean before it is fully hot so the engine will either melt a piston or seize the piston in the cylinder wall. Most race teams aren’t worried about long tern life expectancy or melting a piston as most of they’re engines are rebuilt after one race anyway so they can walk the line a little closer than the average Joe such as myself. Enter ceramic coatings :-] They do 2 basic things for us:
1 - they form a protective layer to keep the heat out of the piston & keep from melting a hole in the top of the piston causing a mechanical failure
2 - they help the piston be more efficient with a ceramic coating which improves the device's heat reflection and transfers part of the detonation energy into the fuel burning phase. Basically out of the parts & more into the combustion chamber.
The two stroke piston sees the heat of combustion on every stroke without the benefit of a cool intake stroke or oil spray like their thumper counterparts. In addition the two stroke cylinder is full of ports that attract heat, especially on the exhaust side where the hot gases flow directly over the piston crown on their way out of the cylinder, building even more heat in the cylinder near the exhaust port. This high heat can burn the little lubrication that the piston skirts see. Another reason why the piston can be a weak link in the ole smoker.

So in my application think of the coated head & coated piston crown as the bread in a combustion sandwich. They hold in & keep all the good stuff from spilling out. You want to get as much down your throat in this power meal without getting your fingers dirty 😆

Please understand I am totally simplifying things here for the sake of a basic explanation so please don't beat me up on the details. I just want to try & explain it as best I can & I am no teacher or engineer 👍🏻

Forgot to add these in for reference above 😂



Obviously these situations are bad & the coating will “help” to keep these from occurring. As you can see it won’t “keep” it from happening though.

To be perfectly honest I monitor my stuff pretty closely & keep up with routine maintenance so the likelihood of me going too lean & burning a hole through the post crown is not very likely. I am however quite curious to see if I can go slightly leaner with a power improvement & since this is for my 3rd bike I have no problem rolling the dice on this one. I have a few different cylinders to play with if so... 😎




Now the anti friction coating on the skirt, different story & why you even see this stuff coming stock now on a lot of pistons.

Yes I think I even spoke to them about their stuff at PRI back in the day.

Christmas in July 😁




So while I am waiting for more parts to show up I needed to get the 2006 put back together & sold. Plus I really needed the garage space back with the trans am coming home & I wouldn’t mind some extra money. Mission accomplished!















Posted it Wednesday morning & sold it that afternoon for $300 more than I thought I would get for it. Unreal what clean good bikes are selling for down here these days! More titanium is now on order... hahahaha!!! 😎

Yeah man isn’t it nuts! Same with boats & jet skis too.
I see you are just south of me so where do you ride? Have you tried mx74? FTT is opening back up soon too 😎

While waiting for parts to arrive & before tearing the bike all down I did need to do a baseline for a weight comparison. I got the digital scale out, put it under the bike lift & lifted it up. Anyone want to take a guess as to what it came in at?

You were closer on your first guess 😎
224.8Lbs



This was with oil in the tranny but I drained most of the fuel out. At most a quart or so was left. If I can get her below 205 that would be awesome! Goal is 200 but it is going to take a lot of $$$ & ideas I thing to get those last few lbs...

Ordered a few things from RaceTech a while ago...



FYI - VitalMX members get a discount on all orders. Here is the code I found to use: vitalmx5offjb

Graphics & a few titanium pieces came in.
Went ahead & mounted the tank hold down screw & seat button. Funny how ya just have to get the cool stuff no one will see.



On the Rtech stuff the shrouds are held on to the tank with self tappers or sheet metal screws. You can get metric titanium machine screws all day long but these were a challenge to find. I went ahead & sourced some super trick ones though. Standard M8 flange head with a star profile & even drilled them out to save weight 😎