Rotax Senior Max 125 Engine Assembly - POWER REPUBLIC

In this week's video we are assembling the Rotax Senior Max 125 engine.
If you like this video, check out our Rotax Playlist here: / @powerrepublic
For more information or to purchase parts, head to our website:
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#POWERREPUBLIC

[@stevethompson9007]

I installed my lad's brand new Rotax Evo senior engine using your vid's 2 years ago - it has performed faultlessly and in first year came 2nd in seniors class and last year won it (Jersey Kart Club, Channel Islands). Thanks you guys!

[@PowerRepublic]

Hey Steve, that's awesome, congratulations on the Big W! you are very welcome and thanks for the feedback. feel free to share the videos with other Rotax Nuts over there for us !!!

[@ShootingOutdoorsChannel]

For the installation of tight fuel hoses...I get a little cup of boiled water and put the tips of the hoses in for about 20 to 30 seconds to soften them and then push them on. Saves the risk pulling them past their yield point for the pliers. We usually have a flask of hot water ready to go at the track which is made at breakfast...(been English and needing a cup of tea between each session and all that ;p)

[@PowerRepublic]

noice cup of tea and some soft hose pipes. not bad

[@thomaspalmer7952]

U guys are amazing and super helpful as a 14 year old who has to service their own engine you guys are super helpful. Thanks from America!

[@PowerRepublic]

Hey Thomas, you are very welcome and thanks for those good vibes all the way from America.

[@alvarobenaventec.7154]

Hey! Great video, and one of the best channels for a person that wants to know more about karting. Can you make a video of what you usually do before a race to a karting (engine setup, chassis setup, etc)? And another video of what you do after the race (cleaning chassis, engine mantainance). Once again, your channel is great!

[@alvarobenaventec.7154]

Oh, and please do it with a Rotax engine 🙏

[@PowerRepublic]

Hey Alvaro, sure can I'll add it to the list of vids to make.

[@alvarobenaventec.7154]

@@PowerRepublic Great! Thanks for answering!

[@roberthind3394]

"Bell end" made me giggle. Great vids, I just subscribed 👍👍

[@PowerRepublic]

Welcome aboard Robert!

[@molaomar1366]

You the best videos on KZbin my friend. I was looking into getting in this sport but you definitely put me 100% into it. I’ll be trying my luck this season in Alberta, Canada championship

[@PowerRepublic]

Thanks heaps Mola. Welcome to karting , it is so much fun. Give it 100 💯 this season

[@br88dy]

I'll echo the comments from America, your channel has been great. I hope someday you can do a series on the LO206 engine, just for us North Americans 😆 The Sr LO206 class is fairly popular and I think your channel would tap into another market of viewers if you had advice specifically for that engine/class. But I understand why you focus on what you race with locally. Anyway, keep up the great videos. Us Americans like your Aussie point of view of the sport!

[@PowerRepublic]

Hey mate, thanks the rad testimonial. okay, L206 is coming right up. as you know we have the Tony Kart 4 stroke machine sitting patiently awaiting its new Donk. So I think the most people in the states and elsewhere are using the Briggs. I guess that is the way I have to go. Where about do you live in the USA? and what tracks do you race and with how many people? Dez

[@br88dy]

@@PowerRepublic I live in the Pacific Northwest of the US and we have a regional league with several tracks. psgka.com/links-and-references/ That link shows where we race. At my local club, Tri-Cities Kart Club, there are 15-20 in my Senior LO206 class at each club race, but regional events are packed. We also have multiple age groups using the LO206.

[@PowerRepublic]

@@br88dy how's that concrete hairpin at the end of your main straight, surely some pile ups on that one?

[@br88dy]

@@PowerRepublic no pile-ups that I've heard of! Turn 1 is banked inward so you can take it with good speed. This is my first year, so maybe I'll see some crashes, but no one at the track has mentioned it. Although it is fairly easy to lock the rears because it's slightly downhill at the end of the straightaway. Skip to 0:34 on this video and you'll see: kzbin.info/www/bejne/rnyQkHeOptKimqs

[@br88dy]

@@PowerRepublic okay just kidding, there are definitely wrecks at turn 1!

[@ot77racing27]

"It's got a little bit of a bellend on it". Classic line.

[@PowerRepublic]

hahahaha thanks bro

[@jerry_li524]

未来如果哪一天我需要自己去组装rotax，我可以参考这个视频。总之非常感谢，很棒的教学视频！👍

[@drtb69]

Stickers are important! Lol😂

[@PowerRepublic]

yeah reckon

[@MADCARMEDIA]

Good stuff! I really enjoy your videos 👍🏻

[@PowerRepublic]

Thanks for the good vibes, glad your enjoying them!

[@AtomCoder]

Amazing informative videos, awesome 👍 Do you have any videos on servicing a rotax max senior top end and bottom end?

[@PowerRepublic]

Sure do. Check our website

[@PowerRepublic]

www.powerrepublic.com.au/collections/videos/products/race-winning-engines-the-rotax-edition-part-one-bottom-end

[@AtomCoder]

Appreciate that, thank you 👍

[@jesperek6402]

Great video, you give all the little tips that does'nt come with the manual, very important for someone like me who try to learn to do as much I can by myself. But what about the oil in the gearcase? Is that another video? Anyway, now I watch your instruction videos instead of karting videos :) my son can do the driving part, I do the mechanics

[@PowerRepublic]

very important point, rotax comes with oil in the gear case from the factory, however I recommend changing it after your first day at the track. use 100cc of Automatic Transmission Fluid for refill. Excellent. if you have any questions or videos you would like us to do for you please comment below

[@terrier53]

Great video. Thank you.

[@PowerRepublic]

glad you liked it T53!! thanks for watching!

[@sebastienwoods3152]

I just subbed I'm going to get one of these I'm just trying to save up money as I'm only 11 and only get money on my birthday and Christmas

[@PowerRepublic]

Hi Seb, awesome mate great plan for all you birthday cash. you might want save up for the Junior Max engine package as that is better for your age group

[@simonmillar3488]

Great video 😉👍🏻👌🏼🏁

[@PowerRepublic]

Thanks mate

[@montyjohnson5359]

Where do you think is the cheapest place to get one of these?

[@PowerRepublic]

where do you live?

[@Eastendhunter9]

You didn’t add oil to the gear case ? But great video

[@PowerRepublic]

very important point, rotax comes with oil in the gear case from the factory, however I recommend changing it after your first day at the track. use 100cc of Automatic Transmission Fluid for refill.

[@MADCARMEDIA]

Could you please do the same thing for the Vortex Rok GP engine? I apreciate your videos a lot 😃 I am currently installing a Vortex Rok senior engine on a swiss hutless kart. All the best, Erik

[@PowerRepublic]

Hey Erik, we don't have those engines here in Australia but I wish we did!! send us a picture via email of your kart set up with the new engine?

[@vigiror1]

Hi again from Spain, what oil do you recommend for the mix with the gasoline? I’ve just bought a brand new Rotax Max evo. Thanks for your support and nice content

[@PowerRepublic]

Hey mate, I would use synthetic oil, personally I use and recommend Motul GP2T racing oil.

[@vigiror1]

@@PowerRepublic thank you mate, have a great weekend !!

[@simux008]

Simpler method to manage lips, use fishing cord, wrap around the rubber and pull from inside, while unwinding it will pull rubber lips into position easier.

[@PowerRepublic]

Great tip!

[@bobtester2736]

@@PowerRepublic Could I ask unrelated question please, about TonyKart vs Kart Republic cassis if you happened to know. On your channel there are tons of valuable content about TK and for person who want to get into Rotax/IAME X30 karting is this best kart cassis to start with? I see fairly cheap second hand chassis in UK and they look beautiful. I wonder if there is a problem with them? Are they using standard parts or I would get into trouble finding replacement parts? It would be interesting to see a video about different brands/makes and what sort of gotchas there could be if one steps out of TonyKart reign.

[@geoffcox7159]

Hi great videos - at how many hours do you recommend a rebuild or a replacement rotax evo engine Thanks from the uk 🇬🇧

[@PowerRepublic]

Hey Geoff , thanks heaps for tuning in 🦾 I would reckon 15-20 hours for the first piston and 40 hours for a full rebuild. More if you are cruising and less if you are a pro

[@vigiror1]

Hello mate, what do you do with the vented cap ( the one to fill in the gears oil)?, do you remove the white cap that comes stock, do you remove it and keep it like this, or you remove it and plug a tube? If so, where do you connect that tube? Thanks and regards from Spain

[@PowerRepublic]

Hey Vigiror, yes remove the cap, its just for shipping. that black plug is the gearbox vent. you can leave it open or what we do is attach a small piece of kart fuel line and make a loop in in down to the chassis, engine or into an overflow bottle. hope that helps

[@vigiror1]

@@PowerRepublic thanks a lot my friend, cristal clear 😊, have a nice one!

[@cortinamk1598]

@@PowerRepublic My piston is 0,02 too big from perfect. What if I worn it carefully with a way longer breaking in set, I mean 50-60 laps 7000rpm, would it be usable by then? Different piston manufacturers didn't have the same scale with sizes.

[@martinbondesson1822]

awesome videos!

[@PowerRepublic]

Thanks Martin, appreciate the positive vibes. Merry Christmas

[@julienbelyu877]

Do you have rotax 125 max evo junior engine assembly? Instead of senior 🙏🙏🙏

[@PowerRepublic]

nah but its the same less the Power Valve stuff

[@BLITZKRIEG1]

I have a question, this is something I've always wondered about. I can usually only hear it in onboard footage of a Rotax kart. Under cornering there is this clink clink clink sound coming off the chassis. Is it the chain hitting the sprocket or the axle stopper?

[@PowerRepublic]

i think the sound is the clutch drum touching the ring gear

[@Icarusflyingclub]

Hey Derek thanks fir another great video. Don’t you have to oil the air filter ? Can you use it dry ?

[@PowerRepublic]

Hey Kostas, yeah oil the filter after washing it. The Rotax ones come pre oiled

[@carlaviation1263]

cant the radiator spin. Is the hoses preventing it from spinning or is the rubber spacer or anything else doing that?

[@sam-sj1nc]

it doesnt spin

[@jaytownsend1158]

Great Channel. Appreciate the constant content. How do you know which end of the RAVE is to atmosphere? I have a 2015 rotax max evo dd2 and the manual has the vacuum tube connected to the other end to what yours is. Have i not been getting the most out of my engine this whole time??? Cheers

[@PowerRepublic]

The top is the outlet use and the side port is the to the Power Valve. The bottom is to atmosphere. some of the older versions were different orientations, however when I run the engines on the engine dyne I can see the Power Valve Bellows moving at 7500 rpm which indicates to me that the Power Valve is operation at the correct way

[@PowerRepublic]

Thanks for positive feedback btw. Not sure on the DD2 but it should be similar, which model EVO do you have?

[@jaytownsend1158]

Power Republic its a 125 MAX DD2 evo. Ive had a few people tell me that it is plumbed the wrong way but the factory manual has it connected to the outlet closest to the power valve vacuum outlet. However, i havnt inspected the bellows during operation to see if they are working.

[@RJYT2024]

🏁👍👍👍

[@PowerRepublic]

Thanks legend

[@MrApmotos]

nice job .

[@joelinden82]

Where’s the seal? Good and helpful video

[@PowerRepublic]

Hi Joe, the engine seals get put on by the officials at the race meetings here in Australia. Thanks for the good vibes

[@bradleydavies-calder7864]

Hi derek, I’ve just brought a pre evo rotax, I want to put the evo powervalve on, what do I need to make this change? Will I need a new loom and ecu aswell?

[@PowerRepublic]

Yeah, you will need the harness and coil ecu and all electrics

[@bradleydavies-calder7864]

Power Republic thank you

[@jamesharbor7981]

How much power do these engines make? I assume they’re a bit more powerful than the rotax 122

[@PowerRepublic]

30 horses bro approx

[@maxnash4031]

How many engines do you think you should take to a race weekend?

[@PowerRepublic]

1 if racing local, 2 if traveling far, and as many as necessary to win if challenging for world titles

[@stefanmorris6730]

how long do these engines typically last?

[@PowerRepublic]

Most guys run them up to about 20hours

[@PowerRepublic]

@C.F TENPOINT OZ HUNTING #1 get a Rotax and go for it. IAME are excellent if everyone else at you club has one and the class is strong, otherwise if you are new just grab ya self an EVO and sent it

[@PowerRepublic]

@C.F TENPOINT OZ HUNTING #1 😉 yeah it can be t3ech, but don't let that dull you enthusiasm

[@drtb69]

Is thereca vid for rebuilding this engine ? Rings bearings etc at 40 hrs?

[@PowerRepublic]

got one you can buy ... www.powerrepublic.com.au/products/race-winning-engines-the-rotax-edition-part-one-bottom-end

[@dgb5820]

Great video thinking of getting one

[@linadukstaite6046]

Can you use race coolant for Tony kart radiator?

[@PowerRepublic]

we use Maxima Race coolant in our Tony kart radiators.

[@LeonardoCostaUSA]

Air intake is located on the bottom??! It's going to eat a lot of dust isn't it?

[@PowerRepublic]

Leonardo Costa yeah maybe but it has an air filter

[@LeonardoCostaUSA]

Power Republic yep man as I race in Brazil and our asphalt track is full of dirty we place our air filter on the top position that's why my concern about it.

[@PowerRepublic]

Leonardo Costa Agreed. Up and forwards like a KZ

[@drieswilkens1187]

I have a complete car but in a lot of peace's engine complete and in running order, need assembling drawing to put all together PLEASE HELP.

[@PowerRepublic]

I"ll do my best

[@Don-perignon]

Do you also have x30 engine if Yes, Why not make video about them

[@PowerRepublic]

Hi Ibbo, We don't have one in the shop at the moment. maybe next year for you......

[@jamesc5993]

Do you need to bleed the radiator when you fill it?

[@PowerRepublic]

no, but I always check it after its first hot run and top up if necessary.

[@Fh77469]

Is 35 hours okay on a Rotax max engine ?

[@PowerRepublic]

yeah not a problem, 50hours is about the limit of the bottom end

[@Fh77469]

Power Republic do I need to change anything in the engine before the 50 hours ?

[@s44yyr]

They will go alot longer than 35 hours. I've got an engine I use for testing, must be on 80 odd hours untouched now

[@JohnSmith-xl9bo]

You forgot to oil the air filter

[@TiboSG]

Dont forget blinker fluid while were here

[@Kristijan1986]

20:41 😂😂😂👍

[@PowerRepublic]

thanks for watching