Finishing My Two Stroke Engine! | RM250 Rebuild 12 

Hi Cameron. Engine looks awesome. However you need to remove that washer you fitted to the power valve lever arm. It needs to have free play to allow the arm to rotate around the shaft it is on. This is so that the arm opens & closes the power valve via the spring. As well as enlarging & restricting the exhaust port to alter power output as you mentioned, the power valve is positioned above the port to allow the valve to change the port timing. This is the main way it alters the power output. Port timing effects the power a similar way to valve timing on a four stroke engine. In cars they call it Variable Valve Timing (VVT). So the power valve is the VVT of two strokes.

This is dope, great lookin engine Cam, “I call this the double nut technique”

"that thing came flyin outta there, it caught me by surprise. kinda like last night" LMAO

The amount of innuendo in this video hahaha. Also, I'm so glad you kicked cancer's ass! Thanks for the fantastic content!

The man is back again, complete with dirty jokes ahaha

Cameron: whats crackin guys My engine: oop that's me

can’t wait to see this bike done!

You can just tell by the intro that he’s doing soo wel and is happy 🙌🏼🙌🏼

Your vids always inspire me I’d like to see a yz250 build for the next one

Nice!!! Im looking forward to watching! You are the only one who make a 35 minute video and it be so easy to watch the whole thing!

Love the videos! You’ve taught me many tricks that I can use on the old stand ups I’m restoring for my channel! Keep producing the great content! Hope I can get my channel like yours one day!

I appreciate your depth of detail in your rebuilds.

Just what i needed after a long day working in healthcare. Crazy times at work, but coming home and seeing this vid makes me forget everything. Keep up the good work!

The little play shown at 16:43 is by design to allow the lever to turn over the shaft with the buffer force of the coil spring. The extra washer used at 17:02 locked up the lever and the shaft which disabled the buffer function designed in this whole spring assembly.

Simple and Clean. Just the way a two stroke should be. Good Job Cameron.

Absolutely incredible Cam. To look at where this engine was to where it is now is mind blowing! You're the best!!

Great to see this build again dude, really digging the RM on the channel🤘 I have said it before, but you are an inspiration dude, not just what you have been through, but what you do on your channel, I been around bikes along time, am a car guy and into my 4wd off road projects, your attention to detail, work process and explanations are second to none, you don’t take short cuts, don’t miss the small details where I feel allot of others focus on big mods, bling eg pile etc and miss little things, like new studs or head bolts, cleaning detail, the work you did on the PV parts for example, not just this build, if anyone wants to learn how to work on bikes they should be watching your vids and filming too dude, while sometimes time lapse might appear useful you rarely do that and hence allot of important steps are not missed, for me anyway as a gear head, it’s almost therapeutic to watch your builds, even though I have done it myself many times, but we learn from each other, why I watch and have watched many channels over the years, talk to engine guys even if can pick up one thing, it’s invaluable ime, do anyways dude, thanks again for keeping it Pryme, can’t wait to see and hear this bike rip. I would love to this this and your CR250R rip around your track for a couple of laps before you give it away, someones going to win a great bike. Grip it and rip it y’all, be safe keep her distance and right side up 🤘🔥

cameron man wow another rm 250 rebuild ,that was the cleanest engine ,thanks

Yo cam- idk if u have ever read any of my comments but i attempted my 1st ever bottom end rebuild on my 02 rm250. Bro my bike started today!!! 2nd kick!! Thanks for the step by step instructions. Man ur vids are gold to guys like me. Im so stoked. Thanks again brotha

Nice build!!! Very nice head with the adjustable volume combustion chamber!!!

Watching you put together that powervalve really makes me appreciate my 02 cr250s powervalve setup. So much more simple.

Nxt to how to do things..U also teach us patients n no shortcuts! And thx for giving that awesome bike away....U rock.

Beautiful engine! That tool you're looking for is a Box end crows foot! You can get them with 1/4", 3/8" or 1/2" drive ratchets, extensions and torque wrenches.

The power valve actually changes the port timing by raising or lowering the port height . Lower for more bottom end and raises for top end power.

This bike is going to look crazy great job

Great video Cam! Been here for a while and loved every bit of it! We’re slowly building our shed so I’ll be able to start doing rebuilds again finally!

Mann I would have been pretty lost if it wasn’t for this video and your last video on this rm build. Thank you for posting full build bolt for bolt. I picked up a rm 250 completely broken down. And your videos made the rebuild a breeze. 🙏

Sweet!!! I'm so far behind on my 93RM250 build but it's so cool that you are walking me through!! Thanks Cam!!

Hey buddy, just an fyi in the nicest way possible so that you are informed. Honing a cylinder creates cross hatching which will allow oil to stick to the walls of the cylinder for lubrication. Not really for sealing. Great video! Keep it up!!

2:22 "I say we send it wit no piston bet that'd work out!"🤣😂

Just when u think an engine can’t get any cleaner, then u make it even more clean it’s amazing, good video

"A little tap with a rubber mallet never heart any one" bangs the shit out of it

Cleanest engine builds out there.

“Yes, she’s tight now....no more second hand parts” 😂🤟

If you want to very easily torque those cylinder bolts to spec, you should pick up some "dog bone" or "crow's foot" torque adapters. They aren't too expensive, and are the correct tool for the job.

I love how detailed you guys are with your builds you Neimela boys build some dope stuff.

Finally yes yes yes 👍 Stay safe in these times peps

I've watched alot of build videos and yours are the best and most thorough by far.

Amazing work! Did not expect the brushed aluminum to look that great!

"Always a bad day when you forget the lube" - Cam Niemela getting it in through the exhaust

Hope you're doing well brother. Cant wait to have you back!

1:57 Just in case anybody is rebuilding theirs or any other similar engine and using this as a guide, do NOT tighten studs in aluminum down to "20 or 30 foot pounds", that's insanely high and you will likely snap them off or strip the aluminum, follow the factory spec. M8/ M10 studs like that especially in aluminum get snugged up to about 10 to 12 foot pounds. (EDIT: If it wasn't obvious, I'm referring to the tightness of the studs into the engine case, not the nuts that thread onto the studs. Steel nut on steel stud accepts more torque, and a stud is different in nature than a bolt)

The quality of these videos never lets me down...can't wait to take mine to this level of beautifulness! 🔥🔥🔥

Dude, you’ve motivated me through my build. Not as extensive as yours due to lack of funds, but a huge learning experience. I have an 07 RM 250. Wish I could post pictures on here. Also, just learned you’re in Spokane. I’m from Colville and am stationed in Fort Lewis. Too cool. Thanks again, bro👍🏼

Wow! That engine is a work of art ! Can’t wait to see it all come together . 👍

Really enjoying your vids in the UK, keep em coming Cam

Chill bro, can't wait to see bike done!!

man great video as always. liked how you showed the parts dropping time after time. showing us no projects is ever perfect. I appreciate all the tips you always share. RM is coming along looking better than new

I bought an 01 rm250 3 weeks ago. I'm using your videos along with a clymer to fully rebuild it. Your videos are informative and entertaining. I can't wait for the next one. Oh yeah... "that reminds me of last night"

Cannot wait to hear this beauty run!!! Looks gorgeous!!

I'm pumped to see this bike done

The mix of dirty jokes and humor is one of the reasons I love your vids man 😂🤟🏽 I'm in the pnw too!

Great! You're back! Missed your videos.

that cylinder head kit is dopeee

Amazing detail love it, probably best to use same oil on piston for fitting as your running in fuel.

Id love to have this bike especially having your name engraved on it and knowing you built it. Its just one of those builds you'll never let go of because of the history

Lookin’ good. Can’t wait to see this bike completed!

Next build idea that I would LOVE to see: 05 and up Yz125

Spider-Man drops an engine on a table “wheelie time”

So clean it looks like a diamond

That engine looks so amazing. Really nice work. The video series has been excellent as well

I've been watching your videos and noticed how nice these engines come out or the nice work you do on everything. So I thought , wow! you should do engines for people , I sure you'll get many customers.

For torquing down the nuts that need a wrench you need a crows foot. You can use a torque wrench with them.

What a pity the giveaway isn't for Europe too! Incredible builds! Keep going! Hope to see an aluminium frame yz soon. Cheers from the Basque Country

Of course that head only fits 01&02. Couldn't have fit my new 07 project lol. Looking really clean man keep up the good work!

Rad indeed. By the work one knows the workman. Excellent!

I just finished doing the top end on my 98 cr250. Wossner 1.1mm over bore to a 67.5mm piston. I went and did my hear cycles yesterday and she runs perfectly 😎👍✊

So looking forward to picking this bike up and meeting the legend himself!

I would pay you good money any day of the week to fix my bike knowing you put in all this detail

16:11 I'm dying man 😁😁 sounds like myself every build thanks for all the videos man

Cool vid, buddy. You just got yourself another like and sub. I do have to mention tho, I disagree with "not lubing very much when putting it back together". It should have plenty of 2-stroke oil on it when asembling to make sure engine wont take damage in case oil pump is not fully primed for the first start-up, or there is some un-oiled fuel left in the hoses in case of pre-mixed engine. Rings will seat fine anyways, trust me.

Can’t wait to see this all finished

These videos are my favorite, I could watch them all day. I need to get another project bike soon. I just finished a polaris rzr170 that im going to surprise my little brother with. Now its time for another bike.

This has been an experience for sure the kids and I love the videos such a learning experience!!! Keep up the great work that you do

Don't know if its been mentioned, but for the head bolts that are in where the exhaust vale arm comes through. You can get crows foot wrenches which are mainly made so that you can torque nuts in hard to reach areas

That engine looks like a beast! Well done

Such a freaking good job man you are official it just sucks how they don’t reproduce many new parts for the rm kx cr older 2 stokes wish someone would start doing it

That engine is going to look amazing on the bike. 👍

Man the detail is great looks good let’s see some body work soon ready to see what you have plan for the body

If you really wanted to, you could use a crows foot to torque the hard to reach bolts.

You are an inspiration man, i loved your videos and the detail.. Craig job on this motor.. From Panama

Basically, I want the engine. How excited am I to see the bike. Amazing 💥🇬🇧

16:15ish “fuck” under breathe when things don’t go smooth. Reason why your my favorite youtuber😂😂

Man that is beautiful.... I am hoping and praying it ends up in my garage!!!!!

Motion pro makes a cheap torque wrench adapter for the base nuts. 12 & 14 mm double sided wrench. They recommend using their equation for proper torque specs with added length but I just torque with the tool at a 90 degree angle so it doesn’t add length to torque wrench.

LETSSS GOOOO NEW VID!!!!!!!!!

The Phathead is clean 👌🏻

Hot damn. That looks amazing. Couldn’t help but chuckle when you kept having the exhaust valve spring come off the collar 😂 been there with other spring loaded parts. Rage quit and came back to it later when I cooled off haha can’t wait to see this bike finished. What are you going to do for reeds on the bike?

Non parlo inglese ma da ex pilota e appassionato di motocross adoro come lavori bravissimo 👍👍

Beautiful work mate

Dang that thing looks clean

I’m Curious Man,How Much Would You Charge To Rebuilt A Motor?

Watched an Amphicar rebuild earlier and the pot metal door handles were heavily pitted. A dedicated plating sorcerer saved the build with magic. I wonder what defects a copper cladding would correct? A nickel finish might look good with some clear Bake & Plate Ceracoat sp? Next time I'll have it. I'm getting inspired to build my 94 RM125. Everything is ready.... There it goes, try again tomorrow. Peace.

Wow! I feel kind of guilty for watching this for free. Seriously, this feels like a class I should have paid to take. So thank you! I really enjoy your videos and always look forward to the next one. You inspire me to better myself, and I'm thankful that you are doing what you do. God bless you and your family!

Love the videos cam, good quality as usual. As for the your nuts, on the cylinder that is. Motion pro make a torque wrench adapter tool that will make your torque wrench fit on the cylinder nut in the power valve orifice.

Thank you,very tactful well presented lesson,I can follow and understand,but do it myself ,not able to remember all.You are an excellent tutor.Again thank you.

Cam the man! I am in the middle of a Cam style rebuild atm. Coming along great with all the details you provide making it easier in so many ways. From the tools you use to many many links and tips ... can not say thank you enough! I see a Cam restoration/ performance shop in the very near future! Pryme Racing! Think about it ! All the best. Sean

Man this is one of the sickest looking motors I’ve seen !!! Awesome job keep doing your thing !!!🤘🏼

Haven't watched your videos lately because interest shifted lot more towards cars, then i heard the word Cerakote and instantly recognized what this was all about. My bike is sitting in garage, i have to fix it

Looks nice af bro can’t wait to see finished article stay safe out there cam