Installing Dirt Bike Flywheel Weight + Ride Test -- GYTR Weighted Flywheel on 2019 Yamaha YZ250X

[@Mmmmmppppppp]

How come in the intro your riding a 2stroke yet the final outro you're talking about a difference in the 4 strokes? Ya lost me there...

[@SourceADV]

The 4 strokes get to a certain rpm then “flame out” or just stall in an aggressive, jerky way, and that rpm is much much higher than this bike. That is because of the high compression and half the number of power strokes. This bike might literally be chugging along at 400-800 rpm here, and I feel like the 500exc is out at around 1200-1500. That make sense?

[@Mmmmmppppppp]

SourceADV yes, thank you!

[@TheEnduroClub]

@@SourceADV is certainly true. I own a 2010 KTM530EXC and it does stall a lot. Btw, did you get a chance to weigh the difference in grams between the stock flywheel and the weighted one? just curious.

[@SourceADV]

The GYTR flywheel is +8.4 oz over stock

[@Schnot]

You don’t need an engine lockup tool. Put it in gear and wedge a rag between the chain and the rear sprocket. It’ll save you a few bucks.

[@SourceADV]

For sure, good trick!

[@ZSharkPH]

Must be a big improvement without stalling down low. Big bonus with a kick only bike.

[@SourceADV]

For sure!

[@whitetrashgarage8110]

You can put a bunch of rope in the cylinder to "lock" the motor at tdc (just leave a tail hanging out to pull the rope out). Or, you can jam the rear brake lever down and do what you gotta do. I prefer that so I'm not forcing the piston in to anything.

[@Schnot]

Just wedge a rag inbetween the chain and rear sprocket

[@SourceADV]

For sure, good trick!

[@stevemoltisanti5669]

@@Schnot you know that doesn’t work...go try and report back. You need an impact or some kind of holder.

[@SourceADV]

Maybe a really thick rag folded up a few times?

[@SourceADV]

Schnot share your wisdom!

[@Pajero.m57]

Nice vidéo ! Thanks for the test at the end of the vid 👍

[@SourceADV]

Glad you liked it!

[@theladdiesda8190]

can you still fit one of these as well as a recluse clutch ? woukd it even be worthwhile at that point? does it damp vibes at all ?

[@SourceADV]

It’s on the ignition side of the engine, the rekluse is on the other side. I didn’t see a need for a rekluse, these bikes are so hard to stall if you get good at the clutch. I didn’t notice any change in vibration cheers

[@ziggithecat3649]

Thanks for the upload. Which size is the thread of the Puller?I havent find the right one yet...and do i need the engine stopper tool or is there another way.Thank you

[@SourceADV]

I’m not sure exactly, if you put in your bike on rocky mountain ATV mc it will show the right puller for your bike. You can use a sprocket jammer by motion pro or just put it in gear and have a buddy hold the rear brake really hard too

[@nicholasdaniel806]

Thank you great video

[@SourceADV]

Cheers!!

[@christianc6731]

Dumb question, Will I still need the engine lock up tool for my yz450f? Great video I need one!!

[@SourceADV]

Oh, I don’t think that style of lockup tool will work for a 4 stroke because of how deep the spark plug is in the head. Just get the bike to TDC, put it in first gear, jam a rag in the rear sprocket and lock it up that way. You can have a buddy step on the rear brake at the same time too. Hope that helps!

[@christianc6731]

@@SourceADV awesome thanks for the reply, cheers from Wichita my friend!

[@SourceADV]

@@christianc6731 Cheers!

[@chadf4i]

You don't have to re time the ignition? They must have identical machining to the stock weighted flywheels.

[@SourceADV]

They are, the GYTR is a Yamaha product.

[@rshoff14]

Did adding the heavier flywheel make any difference on motor vibration? I race a 2020 250x and usually by the end of an hr and a half race, my hands are completely numb from engine vibes. Even after running a mako bar clamps and evo bars. Just curious if the flywheel help at all

[@SourceADV]

Oh wow, that’s a good question, I didn’t notice any difference but I wasn’t really looking for it. I never really though of the bike being a viby bike, so maybe it did? I only had about 5 hours on it when I put the flywheel on it, so maybe I just always thought it was a smoother bike. Sorry man, but it sounds like it might be worth a shot!

[@TEAMHUMAN1]

There's some good options with handlebars that allow for flex that could help you rodney

[@SourceADV]

He’s got the Mako360 clamp and Pro Taper evo bars, which is one of the best combos for vibration reduction and flex out there. Rodney, try running ODI rogue grips in the light gray soft compound, that can help a lot too

[@Procheeze]

Which handguards are you running?

[@SourceADV]

Those are the Cycra Ultra Pro Bends direct from Yamaha's GYTR catalogue, hence the blue matched/branded shields. These came with the bike. I run the Molecule full wrap plastic guards now on all my race bikes, but I also don't hit trees or go down as much as I did back then LOL!

[@jonganzer7478]

It would be helpful to know how much the stock flywheel weighed vs the new one so we would have a frame of reference for the difference in the ride. Thanks!

[@SourceADV]

GYTR flywheel weight only comes in one size which is +8.4 OZ from the stock weight

[@blackbeard7623]

I'm doing the same swap today. Did you need to mess with the carb settings at all after the install?

[@SourceADV]

Nope! It was all good

[@blackbeard7623]

@@SourceADV Awesome! Thanks for the quick response

[@SourceADV]

No problem man! Let me know how it goes!

[@davissouza231]

Excelent video! Thanks!

[@SourceADV]

Cheers!

[@anasazbarga5964]

Whats the link for it?

[@SourceADV]

Here you go: www.rockymountainatvmc.com/parts/yamaha-gytr-off-road-flywheel-p

[@marcelvaleixo3650]

What hand guard are you using?

[@SourceADV]

Cyrcra pro bend

[@hendradaud8598]

how much different weight between stock and that new one?

[@SourceADV]

The GYTR flywheel is +8.4 ounces, good for chugging on nasty single track. This + smart carb and v force reeds makes the bike basically unstallable.

[@hendradaud8598]

@@SourceADV i have spare stock flywheel for yz250x. i am thinking to upgrade my magneto use the same thing with yours. because in Indonesia, i think quietly difficult import that GYTR flywheel. this nice information bro for the other user of yz250x

[@SourceADV]

Cheers!

[@stevenmcilwrath5371]

What ryobi impact is that exactly? Mine wasn't strong enough to loosen the bolt.

[@SourceADV]

It’s the 1/2” three speed impact. If you get the piston stopper tool you shouldn’t actually need an impact, a rachet should work fine

[@stevenmcilwrath5371]

@@SourceADV the piston stopper tool clearly works but a lot of local engine guys think it is very risky...

[@SourceADV]

I could kinda see that for the removal, it is easier to crack the tapered fit with the impact without putting stress on the rod bearings. At the end of the day though I can’t imagine that 50 LBFt of tension to pop that thing off even comes close the stresses the engine feels landing from being airborne and the engine hitting the rev limiter @ 12K. You could always use a big wrench in the flywheel puller tool and try to take most of the stress on the wrench with the piston stopper as “support” or you might not need it at all

[@stevenmcilwrath5371]

Is the tool you used to allow you to torque it a Yamaha tool?

[@SourceADV]

It’s from Tusk on Rocky Mountain ATV

[@leahhendricks8062]

Do you feel like the GYTR was sufficient enough? Trying to decide between that and a dramatic Steahly 13oz.

[@SourceADV]

I think for this bike it is the right size. At the end of the day, it feels like the X is meant to be more of a flowy single track bike, it’s first gear is high compared to a KTM XCW even if you re gear. Im running 13/49 compared to the stock 14/50, seems to be enough for the occasional really technical rocky climbs while still keeping 5th usable in faster sections. I guess too at the end of the day depends on type of riding. For mountian single track here in CO where I’m mostly in 2nd, this seems to be the perfect setup.

[@leahhendricks8062]

@@SourceADV thanks! And at the end of the video, were you in first chugging along there? I'm in CO as well, also on a YZ250X, and was amazed with that clip.

[@SourceADV]

@@leahhendricks8062 that was in Flagstaff AZ, but I’m in Niwot. Check out the smart carb review video I did, there is some crazy chugging footage in there too

[@tylerpreston95]

Did you keep the bike in neutral during any part or was it in gear? Does it matter either way?

[@SourceADV]

In gear for removal. You can tighten in gear too if you jam a rag in the rear sprocket.

[@brendon4901]

What gas tank is that? Happy with it?

[@SourceADV]

Ims 3.2, I didn’t mind it, some guys hate it

[@brendon4901]

@@SourceADV Thank you

[@2crewaction245]

That’s impressive! Are you running stock gearing also?

[@SourceADV]

In that video it was running a 51 tooth in the rear. I just moved to 13/49 (equivalent of roughly 2-3 teeth on the rear) and it is perfect for the really technical rocky climbs we run into our here in Colorado and helps me get into 3rd a bit more often on the really flowy stuff.

[@2crewaction245]

SourceADV thanks for the reply! I’m also running a 51 at the moment. Just curious. Guess I will be investing in a fww now :)

[@SourceADV]

For sure! Definitely worth it!

[@felix5847-q5o]

Does it rob the bike of power on the top end?

[@SourceADV]

Not that I noticed!