I just Had to go and Break Something on the Last Day of the Trip!!

[@EdwardRoss-tb5hz]

If the trailing arm is flexing beef it up. Never ever say the tires are too big 😊 Nice work, rig is very cool.

[@scrappy7571]

Could box the the arms with sheet metal.

[@memorris2]

Despite the chain issue, this is the best performing machine youve built so far!!!! Well done man!

[@scrappy7571]

Suspension works amazingly well esp for first time out with it.

[@curtisnewton895]

insanely cool machine

[@reviewaccount469]

I definitely prefer an IRS instead of independently driven sprockets on trailing arms. She leans quite a bit at speed and that is bound to mess with chain alignment. I understand this entire setup was using parts on hand and experimental, but hopefully a learning experience as well. I'm not trying to be overly critical, its an impressive machine, works well, and made for a lot of cool content. I hope you continue to create 4x4 vehicles. So many other established youtubers have stopped innovating and are just mailing their episodes in these days, I continue to be a fan of yours because you never stop making awesome stuff, and hadn't sold out to sponsors. I'm not going to stop watching if something fails, I'd only stop watching if you stop trying.

[@bryduhbikeguy]

That was a Rock damaged sprocket.The trailing arms do have torsional twist. Fix those and Fenders,and you'll have an 'Ultimate-Minster'. (Mini-monster).Awesome videos,and build Chris.You built a great machine and your ideas proved to be Awesome !

[@daveauman2339]

Impressed that all of the chain drives are working so well. Your sprocket bent because you threw the chain and it got bound up between the sprocket and swingarm. I'd add top and bottom guides, like a dirtbike and send it.

[@Zac.J]

Rear brake bias can actaully be desirable for cornering! Stops the front wheels from locking up first and understearing. Great video! This is probably the best project yet.

[@sammcbride2464]

Good camera work. I like the suspension imagery.

[@mustangtoo]

That’s a great build! You did a fine job. Watching the forward facing rear view frame by frame, you can see some flexing in the swing arm. Boxing as much of the arm as you can with a decent gauge of sheet metal may help take a lot of the torsion load. I have over 50 years in the tool and die / machine fabrication business and education. I really enjoy watching you and the others inspire the next generation of machine / fabricators. Keep up the great work! I wish you success!

[@GaisaSanktejo]

Seeing this second vid makes that mini trophy truck even more impressive! Especially when you consider you essentially have front wheel drive (lose the rear chains), rear wheel drive, and "one wheel peel" and no matter what, that thing just takes it and keeps going!

[@Nordgrinder]

Flex is not the issue, it is the lean angle causing the inside sprocket to contact the ground in corners - you can even see a spark right before it happens at 22:50.

[@JETHO321]

This comment needs bumped. That's exactly what happened.

[@D-DAY]

Good eye i think your right

[@DirtGearTv]

I noticed this too

[@gregholloway2656]

Looks to me like the trailing arm is torsionally twisting in the corners, which misaligns the chain sprockets (front vertical, rear tipped on an angle), and the chain jumps off.

[@olivernice8291]

That looks serious fun! Another brilliant build. Learn as you go and take us for the journey. Great vids

[@MrMorepower71]

That thing looks like the suspension is setup really well. Seems like a solid ride.

[@cucarachagtt]

Take a look on how close is the sprocket to the terrain in the corners, maybe the issue is that the are grinding the floor...

[@Nordgrinder]

This is exactly what I see as well. Flex is not the issue, it is the lean angle causing the inside sprocket to contact the ground in corners - at .25 video speed you can even see a spark right before it happens at 22:50.

[@musicauthority674]

I have learned never speak too soon. and I have stood by that. it looks as if some strengthening of the rear control arms is necessary.

[@AndrewMalkin]

That place looks like so much fun!

[@cupid11948]

dawg this looks like its runs and rides better than a Polaris that can from a dealer and has no problems can't wait to see it fully painted and completed respect dawg respect

[@brycehenson4345]

The way to do a diy repair like this is camp fire for heat then use a hammer or something to bent it back remember the next time this will happen. Still a great project. Bryce

[@hemidart7]

Flip the jack upside down 19:45

[@EngineeredToDesign]

Man this thing is a beast! One of the best setup machines you’ve built. These things happen, now time to make it stronger..

[@petedandrea528]

Just FYI when off roading try to keep your thumbs on the outside of the steering wheel. If the tire gets kicked hard one direction or the other spins the steering wheel hard it can brake or dislocat your thumbs very easily. But other than that awesome build looks like a good time keep the projects & videos coming.

[@Thorgon-Cross]

While good advise that is not a problem on this due to it having power steering.

[@JETHO321]

One thing to consider is that the chains being on the same axle wont allow the rear suspension arms to articulate independently unless one wheel slips from the other. You need something to act as a slip differential. In other words your chains are acting like a torsion bar.

[@spencerward3563]

I don't think it prevents the independent articulation but it certainly buts extra strain on the chain drive when it tries to prevent it. I'd imagine the torsion bar effect like you said combined with twisting of the swing arms is what caused the chains to pop off. I think the solution is chain guides as close as possible to the top and bottom of the sprockets that are attached to the hub so if there is twisting the guides will stay aligned with the sprocket. Beefing up the swing arms with plating might be helpful as well. But who cares the thing is a beast anyway haha

[@gerhardpotgieter9091]

It must feel amazing to thrash something you know you build from scratch with your own 2 hands Congrats man!!!

[@mackquack2929]

I am impressed. It never stopped moving under it's own power. Great build! Been watching your channel for a long time.

[@flightace1]

So cool machine! did notice the huge side dip when taking corners so you should really put a set of swaybars on it,make them so they are easy to take of when you are rock crawling.

[@hoagiesherlin7732]

It's got a bar on the rear

[@DirtGearTv]

Congrats on this build bro!! You really knocked it outa the park on this one. And It's SO comfortable to ride passenger

[@matthewmiller3580]

I believe it's the body roll that is causing the issues of the chain coming off

[@Nordgrinder]

Yes, the lean angle is causing the inside sprocket to contact the ground in corners - at .25 video speed you can see a spark right before it happens at 22:50.

[@hannable3871]

I hope you realize that there are people who go to school for years and years to do what you're doing and still can't do it as well. You're going to go Places. Keep it up, really enjoy your videos.

[@kbakeritsallaboutnobody.5761]

From this trip we learned the value of skid plates and fenders. Awesome video!

[@gamerduck3707]

Beef up the trailing arm and put some chain alignments close to the back sprocket (so if it ever bends, it'll bend correctly with the sprocket and the chain won't pop off) and this will be the most ultimate mini trophy truck offroader build :D

[@KTBRacing]

Those chains did so well, I’m very impressed with this machine! Sxs go through belts left and right but those chains held up very well

[@hoagiesherlin7732]

I've put 1000's of hard miles on my RS1 and never lost a belt

[@KTBRacing]

@@hoagiesherlin7732 who???

[@aserta]

Could make the section the swing arm with smaller diameter (and a 1:1 ratio) sprockets. That way, the chain's tighter, it won't bash and you move the power bits closer to the body, which means those chains are shorter, thus less prone to floppage. Caveat, you need the swing pivot to be both swing pivot and axle for the sprockets. Not impossible, been done with a lot of things (including some industrial things like ditch cutting machines) but it's extra bearings to change.

[@EliteRock]

The sprockets are actually on the swingarm pivot on this and the CBR project, in fact I doubt the chains would have a snowball's chance in hell of lasting even a day if they weren't. If you check out part 4 of the build, at 15 seconds in you can see the layout clearly.

[@mlsargent51]

It looks like the shifting linkage set up works very well, the way you're grabbing gears!

[@1jacob23]

Awesome machine! I think a trophy truck style adjustable torsion bar would help a lot to keep the rear wheels from twisting in the corners.

[@fred-san]

22:50 some chain protections... -may- must be

[@Ratkill9000]

Chain guards for sure and rerouting the front brake lines

[@edlebrock3501]

Such an awesome build man! Cant wait for the next video!! TRY ADDING A JACKSHAFT OF THE SAME RATIO AS THE FINAL DRIVE AS CLOSE TO THE PIVOT AS POSSIBLE AND TURN 1 CHAIN INTO 2, THAT SHOULD FIX THE ISSUE. OR GET A COUPLE DRIVE SHAFTS OUT OF A HONDA OR SUZUKI CRUISER MOTORCYCLE AND CONNECT TO CHAIN DRIVE AT THE PIVOT!

[@EliteRock]

From up here in the peanut gallery, and now that you mention possible flex issues with the swingarms, the diameter of the tube does look kinda small.

[@droberts573]

Now you can make a series on changing the chains to shafts and installing a rear end. Bummer though. Just to much weight for the chains.

[@jerrywilcox9890]

He's not going to make it shaft drive lol.he likes his chain drive.

[@jerrywilcox9890]

Hole point of testing.he can fix it.

[@swiatalberta]

22:51 You hit the road with the second sprocket. You have too much lean when cornering. Stabilizers need to be added.

[@Nordgrinder]

This is exactly what I see as well. Flex is not the issue, it is the lean angle causing the inside sprocket to contact the ground in corners - at .25 video speed you can even see a spark right before it happens at 22:50.

[@carpenter751]

Looking at where the weight of the entire vehicle hits when those bump stops hit that is what would twist those trailing arms on a high impact corner plus add to that the power of that engine. What an amazing machine. The next season is the re engineering of the rear end. Maybe add another shift half way down the arm and move the sproket next to the wheel where the twist won't affect it. And the brakes can go where the sprocket is now. Probably not easy but a great winter /spring project content.

[@serdiefgotreb]

At least you do have tested redundancy on your setup. Specially for the tyoe of aggresive driving, having certainty that you won't be easily stuck in the middle of of nowhere is great!

[@rexhorning7228]

Using the truck as a press is a great idea. Think press setup you could have used sockets or wrenches in the right places to straighten the sprocket. You were so close to finding your solution. Great job.

[@rexhorning7228]

You could youse some sort of chain guide right in front of rear sprockets.

[@matthewpeterson49]

I definitely agree that you should make skid plates for the sprockets and all the chain drive hardware near the swing arms.

[@kenjohnson5498]

You could have put the bottle jack upside down under the truck and got the small point where you needed it

[@Thorgon-Cross]

Most jacks will not work upside down due to the fluid no longer covering the pick up in the fluid reservoir.

[@SkEezySlays]

Chains did better then I expected they would but I still think shaft > chain drive 💯%.. just a lot stronger, more reliable and no matter what you do they aren’t going to pop off sprockets and such.. idk just my opinion

[@trevormiller1366]

If you watch off road racing, occasionally there is slow motion footage that highlights how much things wobble about especially tires!

[@robertfury295]

Steel sprockets might help. I stopped using aluminum sprockets in my dirt bikes because they always wore faster and I did have one bend. Are there any readily available shaft drives/transmissions that can be used in this application? I have a Kawasaki Concours with a 1400cc motor which is shaft drive. With a chip and a pipe they make 150hp. Might be something to try on the next project. I guess that’s the question that I’m sure you’ve thought about. I’ve always found chains pretty much continue to stretch on motorcycles. Maybe less so than when new but the stretching continues. In a dirt atmosphere even worse.

[@jerrywilcox9890]

He's not going to make it shaft drive lol.

[@JoelArseneaultYouTube]

First off, well done, it is a beast and worked really well, all in all. I don't think it's an issues with swing arm flex. The chain came off when the wheel was unloaded (on the inside of the turn) and not when it was loaded. I'm guessing it is a chain tension / guiding issue. Like someone said in the video... dirt bikes all have chain guides. The chain pulls from the top and feeds onto the bottom of the rear sprocket, so it would be a good idea to hold it in alignment at the bottom of the rear sprocket.

[@robertgee5591]

!!!!!!! Simply weld two disks on either side of the sprocket, then it’s impossible for the chain to come off !!!!!!!

[@mxwizzard]

Can't wait to see how you fix the flex issue of the trailing arms. I can't help but to think the cheap chains contributed to the issue though with the way they stretched

[@tonysargent1699]

Well, you've proved your engineering is physically good. That's a big positive.

[@michaelbartlett9742]

I'll bet if you heated it up it would bend easier. Also you need rear track bars like a side by side.

[@frankieacosta8262]

Redesign, Add a sway bar should help, good job on the build , sometimes we learn the hard way !

[@gregholloway2656]

Chris, I’d try building new trailing arms, where they are an enclosed chaincase. As a box shape, it’ll stand up to torsion better, and you could conceivably run oil in the chaincase to lube the chain.

[@17madracki17]

Still a great video. And that thing works great !!! Congratulations man !! You built a beast.

[@hrsey71]

you need a chain slide that keeps the chain in place. theres too much side to side play

[@jameshimself1018]

Chain drive for the 4wd system seems good but mabye you could try to make the rear axle a solid axle with a jimny rear end and make a 4link suspension to spice it up some perhaps?

[@ChrisB...]

Your machine is obviously amazing, but I still think you need a differential in your chain drive. No idea how it would be done, but I'm sure it could. I'll keep thinking about it.

[@octaviofernandez333]

Hello, I am a motorcycle mechanic, I have 20 years of experience in the area and I can tell you that the suspension was bent due to the jumps and the engine could be failing due to problems in the purifier box. They are very strict, you have to install the original purifier because if Not that type of motor fails, the motor sounds like it is not working well. That's my advice, good luck with your project. 👍

[@sammcbride2464]

Good thing you got those handle grips for the t-bar. The ghost in the passenger seat would have fallen out.

[@Cameronvn17]

Awesome videos man

[@whitecompany18]

Great vehicle and great engineering👍 maybe time to move onto drive shafts and maybe even car engines? Four bangers to start..maybe a Baja bug?

[@joebufford2972]

Good job dude. You got to run the heck out of him to find out how far they go. Now you know what needs to be hardened PS. I'm surprised those cheap chains lasted that long

[@warren419xx]

Your sprocket hit the ground need a sprocket protector when you slam into the ground when you jump the sprockets where hitting the ground

[@jerrywilcox9890]

Lol sprockets didn't hit the ground.no way for them to hit the ground 😂😂.

[@jerrywilcox9890]

You on drugs.

[@warren419xx]

When he lands the sprocket smashed in the ground

[@warren419xx]

Not enough clearance from the ground to sprocket

[@jerrywilcox9890]

@warren419xx it got plenty of clearance lol.nothing on that track will ever hit the sprockets lol.

[@dylanstclair9615]

you could have flipped the bottle jack over to have gotten that small contact point you where looking for to bend the sprocket

[@brianellison3525]

I'm thinking you need to go with a single chain to a center section, and independent driive axles to the wheels. The side force on that rig is starting to get up there. Something holding that carrier bearing from torquing inward is in order at this point if you want reliability. Love the build, lets get the doors on. They finish the smooth lines on the sides. Live it, be well and have fun.

[@danf4616]

Monday video! 👍👍

[@lloydnoz7093]

Can’t believe you guys didn’t try flipping the jack upside down 😂, I know it’s jank but it might of worked. Great build though loved watching your build it

[@MaNNeRz91]

Was not prepared for a Monday upload 😮😮

[@brodyscott3297]

Do you still have the YZ85 go kart if so you should do another video on it definitely my favorite project

[@Eduardo_Espinoza]

I think the trailing arms flexing a ton, I don't see any rocks there =).

[@michaelthomas788]

Test drove it and they loosened up real bad and they were flapping when you were hitting the gas it was skipping remember because there's too much space not enough tension that's why dirt bikes have a chain tensioner at the sprocket to keep them from skipping and jumping off when they loosen up from racing and jumping and suspension travel that's what that little plastic guide is for to keep the chain on the sprocket from coming off and doing exactly that

[@TheMotoCircus]

Shaft driven rear ends would be a solid solution for the future! 😀

[@DannyKim-bum]

The body roll you have is probably slowing you down but I'm sure is a ton of fun! I'd be hesitant to correct that with a sway bar? I think you're on to something about the trailing arms twisting a bit and helping that chain slip off. Maybe resize all of your cogs and sprockets to ultimately get smaller chain rings on the rear axle to help combat that and give them more ground clearance? You'd probably never get to use your High Range 3rd gear outside of an airfield though. Tough packaging with the chain being partially trapped in that trailing arm too. Or just bring a lot of spares? :-D Maybe big bash guards for the rear chain rings?

[@MegaRyanskie]

Could you make a chain guide like dirt bikes have on the under side of the swing arm? Keep the chain aligned with the sprocket.

[@chadc2222]

Hard to believe chains would be a failure point 😂😂😂

[@pjl1919]

You think adding a rear quick release sway bar would help ? When you want to rock climb and trail ride you can disconnect them.

[@ShaunHensley]

I noticed in the turns your wheel was leaning significantly

[@GingerPiston]

I said before that running without chain guards and those exposed sprockets is a really bad idea.

[@jerrywilcox9890]

Gaurds wouldn't of helped this issue.chain came off and bent it.

[@GingerPiston]

@@jerrywilcox9890 They would if a rock /stone caused them to come off. Which it probably did. So Im afraid you're wrong here pal.

[@David-yy7lb]

When I saw your test video on the mud trails I had a concern about mud and other debris getting in the chains....do you worry about accelerated chain ware when mud and dirt gets in there

[@landrelarose9963]

Chris, you should never stretch a chain after you recently bought one or more of them. Do you know the reason why. They will never stop stretching. That's the nature of metal. Belts are superior to metal. The problem with them is that they're much wider than chains. This means that you'll need to design the chassis in a different way so that those belts will be able to fit within the tubes of it. How much more distance will you travel with belts? They could last 3 to 5 times the distance than chains. There are people who traveled 20,000 miles with a single belt. How do I know this? I asked Google. Whatever question you ask of it, it will answer those questions more than ninety percent of the time. Of all the questions I asked it, it answered them all. Every time I ask Google a question, I become more intelligent, and the more of a genius I will be.

[@vancemacd6315]

Impressive how nimble it rides. Need some rock guards maby wheel well covers

[@jasonbirch1182]

You can combat all the body roll with proper front end geometry with a higher roll center. Not much you can do in the rear with that setup besides a stiff sway bar that is going to limit one wheel travel. I would guess the rear control arm flex is in the chain tensiner as much or more than anything. Plating the arms between the tubing, even with fairly thin sheetmetal would decrease any flex a good bit.

[@zugi]

I started watching your channel with this project and I have to say I love your content and found you skilled and looking easy and calm doing complicated stuff. One thing I did not like about this project from the start is chain drive.

[@darthgbc363]

Looks like the sprockets are hitting the road while leaning. Move the sprocket next to the tire. Almost like a rotor setup.

[@bobkelly2447]

I suspect that the chain bent the sprocket as it probably stuck to the big sprocket when the chain came off on the other end and then it was forced through the tiny gap between the swing arm and sprocket.... which bent the sprocket. fix ? move the sprockets out 1/2" to 3/4" ....EVEN though you Shouldn't Need it, I think a chain tensioner on each side should solve this.... something to keep the slop out of the chain like a spring roller pressing against the chain.... and I think you are correct in your assumption that the swing arms are twisting in the corners.... time to beef them up alot !!!!!

[@adamengland2519]

Very cool bit of kit and amazing that you built it all yourself. Seriously impressive. I can't believe you didn't have a hammer 😂 doesn't a hammer fix most things? That sprocket will need some heat, straightening and some quenching. Could an anti-roll bar be the answer?

[@hf7410]

In the long run, think of it as an intentional weak point. An aluminum sprocket is easier to change out than to rebuild that bit if the swingarm everytime a rock gets caught if you were to switch to steel sprocket. There is a pro to the situation!

[@bigbusdriver4782]

Overall I say you had a giant success, performance was great! Good job! As for the chain, seen that before, inside a machine indoors with no rocks around. it wasn’t a rock, the chain came off the sprocket and wedged between the sprocket and the arm, the power and speed of the engine jerked the chain out so fast and hard you probably didn’t even hardly feel it, but the damage was done. You might be getting some flex that need’s attention but the biggest issue is you don’t have enough idler sprocket for that length of chain at that speed while bouncing around on a trail. The speed and weight of the chain causes the slack side of the chain to sway, add mud, sticks and pebbles…you gonna get slack and side load…add a little flex and it peels the chain off the sprocket. Add idlers closer to the sprocket, buy better chain and the problem should go away.

[@Thorgon-Cross]

There is a LOT of body roll, looks like the tire sprocket it twisted relative to the jack shaft in the turns. Personally think the chain is being twisted till it pops off or bends the sprocket and chain like was seen on the right side. A sway bar could likely fix that.

[@itarry4]

When you do the body panelling you really should install some mudguards, even something simple would be better than nothing especially if you ever want to actually use your mirrors. Seems from the first couple of minutes they're basically unusable so if you're not going to bother with mudguards then you may as well get rid of the mirrors as well. I'd cover the entire bottom of the truck in sheet metal and I'd say both trailing arms need strengthening up a bit don't change the tyre size they seem perfect and look so good. STRENGTHEN THE ARMS! In fact I'd be tempted to go all out on the sheet metal and basically build it a "body" covering the entire thing other than the windscreen and above the door areas obviously.

[@wingtipsworld5909]

ive said in your other builds that you need to build sprocket/chain guards or just start building with drive shafts. Which you really need to build with like a honda 4 cylinder k motor or something anyways and get away from these bike motors. im still waiting for the clutch to smoke on woods riding/hill climbs.

[@warren419xx]

Alot of body roll might need a wider stance for better cornering but it looks amazing 👏

[@EdwardMurray06]

Considering you had miles of driving with no problems, then once you hit it hard all day you lose both chains I seriously doubt it’s because of any kind of flex in the arms. It’s because the chains freaking stretched, that’s it. Don’t over complicate it. Buy better chains, prestretch as much as possible and send it. You signed up for these issues when ya chose chain drive. Considering that’s the only issue you had I’d say it’s a winner, for sure. Good job man. Tighten up the compression settings on those shocks. Rebound seems to be perfect.

[@LearnandLive97]

Well done man great work. Looks so fun dude

[@stachsco]

If you have possibility to put 1:1 sprocket's for this chain, smallest as it possible, it definitively reduce chain crossing.

[@roadboogalabuilds5318]

Still looks like a win to me, I’m sure something you figure out and make it even better

[@SeanKarleone]

Fair play! It lasted a while. Maybe yeah big tires are not it.

[@whosaidthat5236]

I like how he says you need a hydraulic press as the sprocket is right beside a bottle jack. Should have put the sprocket in between the truck frame and bottle jack instead of soft wood

[@somethingelse2740]

Diffs and driveshafts in future projects.

[@sempi8159]

No