Predator 420cc Oil Cooler & Filter Install

Today we experiment with a Harbor Freight Predator 420cc Engine. We show how to install an oil filter, oil cooler, and oil pump. We saw 30-40 degrees difference on the temp of the oil. With the added filtered oil this can extend the life of your go kart or mini bike engine and help make more power. We will be putting this on a 150cc go kart. Check the links out below.
Parts Used on This Build
Predator 420cc - bit.ly/3qHtMdR
34mm Mikuni Kit - bit.ly/2V4WmZa
Stage 2 - bit.ly/34iuHpg
Top Plate - bit.ly/2NDP1fT
Oil Drain Line - amzn.to/3BTEynp
M12 Battery Mount - amzn.to/374XxgH
Pump - amzn.to/3zZ1gsP
Oil Filter Housing - amzn.to/3i5pv29
Oil Filter - amzn.to/2Vi7moK
Check Valve - amzn.to/3yeXmLJ
Clear Filter - amzn.to/3f81DJj
Oil Cooler - amzn.to/3BPJidI
Merch & Events - bit.ly/33YbmtO
Check Out Go Power Sports for all your Go kart needs! bit.ly/2viX9vP
Parts & Tools used on the channel - amazon.com/shop/redbeardsgarage
Quantum Machinery- Siegmund Welding Table - bit.ly/36PHm6G
Nargesa CC60 Bender - bit.ly/2xWDVxj
Prime Weld Tig 225x - bit.ly/2EbSIqK
Prime Weld MIG180- bit.ly/2Q44l5V
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*********Disclaimer*********
Please do not try to re-enact or recreate anything you see in these videos. We are trained professionals. Red Beards Garage does not take any responsibility for injury's created by doing so.
#RBGKarts #RedBeardsGarage

[@larrybreuer4495]

I think this what all them over educated fellers would call “ proof of concept “. Well done sir! 👍👍❤️

[@SkipsDirtLotGeniusAdventures]

Questions appropriate p oopppppq 11th Q ò Questions qq 15th Questions qqqq1qq Q qòo Q Questions 1woman Q p 1woman😢4😢is for 66gst0k9🎉o9

[@scottc0510]

Great idea! The only thing I'd change is to find a way to mount the filter vertically so there's not a mess when changing filters.

[@Chris-jf1cb]

Need to return oil threw the governor hole once removed then it'll be dumping the cooler oil over the moving parts instead of pushing threw the hot crankcase oil

[@bryduhbikeguy]

Great idea.Thanks.

[@johnmartin560]

Not a great idea if you're running at high rpm. The power loss from windage would be pretty significant.

[@Chris-jf1cb]

You can put a oiler tube into the crankcase bent to wherever you want if your that worried about windage lol. Like oilers on diesel engines

[@davidzelinski1868]

Return the oil through the valve cover to cool the head.

[@AppalatchieRaised]

@@davidzelinski1868 perfect idea.

[@earnestmatlock9694]

One small step for honda clone engines; One giant leap for reliability. Well done Red Beard. 👍

[@hernandovillamarinbuenaven7476]

Hi Red!: Thank you for your great videos + dedicated work on these small engines with a lot of potential to improve basic factory features; >How about installing the cooled + filtered oil (At least, part of it..), thru the valve cover to do perform a couple functions: >Lube + cool the valve train. >Cool the head itself *The rest of the cooled + filtered oil, to be returned thru the governor hole, thru a copper or brass tubing (Could even add a small nozzle..), to squirt oil to the mechanical moving parts, probably including the piston skirt iself + cylinder wall. *I'd also keep in mind the positive pressure built inside crank case to partially help the above circuit. >Bottom line is a cooler working engine should be a longer lasting one. Of course the oil pump itself should be strong enough to fully keep moving the cooled + filterd oil, and overcome the crank case pressure.. (Just my two cents)😢

[@DrewRowell]

For most inferred temp guns, you have to hold the gun 1-3 inches away from what ever you are measuring for the most accurate results. I have to use them in the oil refinery I work at, and it does make difference between holding them a foot away and an inch away from whatever it is you’re temp checking. Awesome video once again👌🏼👍🏼👍🏼👍🏼

[@rong4189]

Pretty cool! “ Keep a ton of hose…” and an engineering degree from “Harbor Freight” was a legit LOL!!! 😂

[@firstjohn3123]

"Did they cross-thread all of them? Yes they did..." 😂😂 Been looking to do this on a long-run generator. Thanks!

[@beachthor1]

Just rode my Coleman trail bike you sent me back in 2018, still goin strong! Love the vids, keep it up!

[@BobSmith-jt3zj]

Nice! I can’t wait to see how the alternator turns out.

[@mikesbarn1858]

Keep in mind that all of these air cooled engines are running less than 100 degrees from total failure. Every degree you remove helps with performance and longevity.

[@travismauldin7194]

16:03 man! i like that new gas powered folding table!

[@David-js6sg]

I have already done this i added a oil pump and oil cooler and oil resivour to my Generator i also wrapped my long muffler with 2 1/2' inch aluminum tubing with brass fittings i pump antifreeze thru one hose and send it to a external heater core with 3 speed fan 12 volt ⚡️ dc the other aluminum tube. I Pump FRESH WATER 💧 through this one and it heats water up in my water heater . It curculates water 💧 in my tank heating up my water tank , for hot 🔥 water to use for bathing or washing dishes or washing machine for clean clothes , i also use my generator to charge 3 AGM Battrys 150 amp hour battrys giving me 450 amp hours of DC current at 12 volts ⚡️ DC for my 3000 watt ac inverter. I controll everything with a marine generator controller.

[@wilburmassey2533]

I have always liked these Predator engines and to see the mods and upgrades you do, makes me want to sell a few other toys and go start a buggie project. Keep the videos coming! -Lee, Gainesville, GA

[@RedBeardsGarage]

Glad you like them!

[@madmanorgan]

I've always wanted to do this, didn't know where or how to start, YOU paved the way. Thank you 😁

[@Cereal_Killr]

Why is this not a thing today BEARD! Ground breaking man! The engines you could save from windows with this setup my man! lol

[@nickgibson1191]

Absolutely love the in depth motor work and info. Keep it up man

[@kainatticus]

19:49 Couldnt agree more, I love these sort of projects

[@Rebel-Neck]

Can't wait to watch tomorrow night!

[@nightkidnick]

8:00 I have a stage 1 predator 420 that has issues with the battery not being able to properly charge. I’ve seen the video on how to put better charging coils but I’d definitely like to see a video on how to Setup an alternator! Thanks :)

[@convenienceisa4letterword320]

I'm thinking about doing this for the transmission in my wife's suburban. Thanks for the parts info.

[@melaniehazen3529]

excelent idea the only thing I would do is return the oil on top of the crank cass so the oil will splash off the crankshaft and add a lot of lubrecation to the engine. thanks keep up the good work. Brent Hazen Glendale Az.

[@spottyjack614]

Another great R.B.G vidd... this is a great set up for my model #310 bobcat. Plus I have room for it.. my harbor freight motor doesn't getta Lotta cooling besides what it produces from itself.. all air cooled motors need as much cooling as possible .great vid R.B... looking forward to the alternator vidd. I Luvv these How 2 mod viddz👍👍👍👍

[@averyintrusive7610]

Those engines are more than enough to thrash around and have fun. Thanks for the video awesome mod.

[@NBrogdon45]

You should build and produce your own alternator kits, I'd bet you would make a killing on them!

[@AppalatchieRaised]

Put the oil return line through the valve cover on the head and really have an impact on the cooling capability

[@papabits5721]

Will be great on the new 459cc pressurized oil system .

[@melaniehazen3529]

I have had the oil pump idea for a long time thanks for testing it out. Keep up the good work. Brent Hazen Glendale Az.

[@TejasToolMan]

That's pretty cool I wouldn't mind having an oil filter and cooler on my power washer and Generator that sucker runs 8 hours a day

[@jamescarney2088]

Old video but I watched it and wondered if you could use the oil level wiring fitting as the return hole and make it more of an oil squirter system aimed at the bottom of the piston. would probably require a higher pressure pump

[@PrecisionClays]

I'm thinking about doing this for my 459cc predator generator and was wondering if the pump has held up well. It doesn't need to move a huge amount of oil but it's a gas/diesel pump, not designed for thicker and hot oil. The good part is that if it stops working the engine would just be back to operating like it was, pretty safe! I really appreciate this video!

[@Johnnyreengo]

What a great spot for an oil filter! 😂

[@PaulThomas-qo9vy]

I like the idea & the execution of this project. I believe the temperature difference would have been more dramatic if both engine were run with a load on each engine. Temps. would have been higher & the cooler would make even more difference. Great project & I look fwd. to the Alternator install.

[@crazyprepper5400]

Cool. I remember doing it about 3 years ago and it worked great. Looking good

[@dodgeme1986truck]

I'd like to see this revisited with several different transmission oil cooler sizes and utilizing hard lines instead of rubber hose just to see how much difference can be made, also running a small hydraulic pump (as the oil pump since hydraulic pumps create flow and the pressure is created by restrictions/resistance in the oil circuit) direct or via belt from either crank or flywheel vs electric pump for the oil pump

[@jTone40]

Now I want to revamp my Duromax generator. cool experiment.

[@crippleguy415]

Now you can ad a turbocharger now that you have a way to lubricate it . 😃👍🏻

[@RadSalacan]

I just bought an oil cooler and filter setup for my GY6. I'm excited to see this install as I imagine it will be pretty similar.

[@midixiewrecked7011]

Don't do it!!!! The gy6 Does NOT have a *pressure pump* , do yourself a favor and send the cooler/filter back to wherever you bought it . You're definitely gonna blow up the engine.

[@RadSalacan]

@@midixiewrecked7011 Yeah, I'll do that.

[@funkehouse]

That "hose" joke was on point! Had me laughing 🤣

[@ericschein1857]

I liked the build, and love putting oil coolers on engines to make them run cooler. I wonder how a counter flow cooler would work (liquid/liquid) and have water cooled oil. As a HVACR guy/instructor at the state trade school, I love to do experiments and ask these questions.

[@olsonspeed]

Is there enough space in the crankcase to run a loop of copper connected to an external radiator? I very much am interested in trying a liquid cooler or oil cooler on a 224, I have Honda Odyssey 250 that was modified with a liquid cooled head, it worked very well on convection flow.

[@dodgeme1986truck]

The best method for that on a small engine would be an external liquid to liquid heat exchanger... This could work on either a pressure washer or steam cleaner as a water pre warmer as well, or if an air cooled generator was used as an apu on a cmv 3 liquid to liquid exchangers could be used to pre warm the coolant diesel fuel, and engine oil in the sub freezing regions of the world...

[@SportbikerNZ]

Man I love this. Completely unique.

[@MudMotorsMax]

I need this for my mud motor in the water

[@miketee2444]

A couple of benefits, longer service between oil changes and considering these motors hold very little oil this set up should almost double your oil capacity.

[@striker0289]

this is great. giving me Ideas for my duromax 440 IRS vortex build. cant wait to see the alternator install.

[@trailerparkgarage6574]

I’m excited for this build

[@JH-oh1in]

The pumps usually like to be ahead of the filter and push rather than pull through restrictions. As a fuel pump they die fast with restrictions. Could try putting the oil return in the head? May drop overall cylinder temp more?

[@jeffjohnson3912]

I wanna see you figure out how to add an oil squirted to this kit for the head and rockers…if possible. Great vid!

[@AutodidactEngineer]

Yess!!

[@BDueceCFD]

How about drilling the valve cover and putting a barb on it for the oil return.

[@jeffjohnson3912]

@@BDueceCFD I like that idea but I’m thinking oil directed straight at the rockers. Not sure if that’s possible with the valve cover venting the crankcase gasses. Don’t want to clog things up. 🤷🏼‍♂️

[@tblosser8921]

If you run the oil back in the valve cover it would help cool the head and lube the valve train

[@SpeedDemon41337]

I was thinking the same thing.

[@MrMinnesota99]

Should be fun changing the filter

[@FPVSlacker]

Instead of the oil cooler you could also have an external oil tank. This would increase the total volume and heat capacity of the oil.

[@zackskinner2666]

I mean the whole system adds 1/2 a court of oil already

[@inmotion81]

That's really good idea

[@SportbikerNZ]

Except it wouldn't add any active cooling, just a longer delay in rising oil temps from the larger thermal mass of the increased oil.

[@midnightwaterdragon4725]

@@SportbikerNZ you put heat sinks on the external oil reservoir

[@SportbikerNZ]

@@midnightwaterdragon4725 You could. Still a distant second option to an oil cooler.

[@ryans750]

Good job with that setup. If nothing else you have the ability to have a pre/post oiler for those all-day hoon sessions. I think the cases being the same temp on both engines is a result of them being designed as a heat sink from the factory and wicking heat from the cylinder. I bet if you got a temp probe you'd prove yourself right on the lower oil temp, which is the more important factor and might let you run a lighter weight oil and give you a little more power. Also if there was a way to dump the return oil out on the exhaust side of the head but still flow back to the sump quick enough, I bet you'd also pick up some power there too. A piston squirter on the return might also do the same.

[@Kylesa89]

All I can say is, its beautiful sir! I love it.

[@josephsaucedo8691]

Iv been waiting for someone to do this for some time a electric fan with thermostat would be sweet 👍👌✌️💯🥂🏍️

[@delandbrooks3291]

Just the added oil volume will help keep the engine cooler. The filter and oil cooler will probably make a bigger difference under load.

[@CJLeTeff]

Greg, nice video! 🤘🏻🤘🏻👍👍

[@JohnSmith-yn8pl]

Are you going to test this set-up under a load? Just would like to know the temperature results then. The idea of returning oil to cool parts better sounds like a good idea.

[@4x4rcoff-roadtractors54]

It's definitely a good idea to have the oil filter I did the same idea on my off-road tractor it had the 440 Duramax I use the drain plug for the pickup I didn't buy that nice pin I just drilled the hole at the middle of the tube to it and then head of it going through the pump through a radiator and then I went back into the valve cover it worked all right it's just over time because I had no filter everyone the pump

[@kartnerds]

Click on Redbeard and KZbin torches me with an ad about getting rid of my belly fat. Brutal Also adding a filter and cooler pretty rad.

[@manlyhelp]

It kind of impressed me that the one without the cooler was within a few degrees of the modified one. Honda (whom everyone has cloned) definitely did a good job in their design.

[@Rebel-Neck]

Finally somebody else did it!!! That's awesome you guys, mine never had a oil filter for the cooler I really like what you guys did.

[@jagman2962]

😂ton of hose😂. Great video man!👍

[@kylejolda2170]

The drain plug is 3/8 npt threads and home depot lowes any hardware store sells 3/8npt to a hose barb adapter Fyi

[@timmichalchuk5134]

Thank you! That’s actually the most helpful comment here! I’ve been wanting to get what zi need while zi wait for my engines to arrive, and now I know, thank you!

[@creepycrawler43]

Very cool man way to think outside the box

[@possumkingdompowersports6510]

Starting to look like taryl’s fuel test lol, this is awesome!!!!!

[@jhaedtler]

Rivnuts also come Indexed. So they will not turn. Easy to install just cut a small v cut with a small file in the hole and line up the index tab when installing. If the rivets loosens up it will still not rotate!

[@BandWidthExpired]

How do you check level? will that check valve hold back bleed back? i mean its a vented system at the crank so i'd worry about bleed back "over filling" the crank case. Great setup

[@Robert-k7m]

I really wanted to ask that question Thank Yall! 😇🙏👍👍👍👍👍+

[@ericcooper2174]

You’d definitely see a major difference in cooling with a larger oil cooler and strong fan

[@techguy3424]

Robot Cantina is running a 420cc predator in a Honda Insight, should check it out if you haven't already.

[@kylebarnes7256]

Couldn't you have just opened the fill caps(dipstick) and shot the beam right at the oil? Feel like the numbers would have been more dramatic from one another. Great video! Thanks for your hard work RBG!

[@delmas15]

Outstanding job!!

[@55418und]

Outstanding! I can't wait. :-)

[@fueledbycombustionf.b.c6321]

This was great info 🤜🤛

[@NZsportbiker]

Very cool. Love this project.

[@bradmaas6875]

So when you do the oil and filter, specifically the filter, where is the oil going to go? Maybe mount the filter on the side of the plate? Also if you mount everything below the engine it's easier to fill the system with oil and be sure of no air pockets and true oil level in the motor.

[@dylanzrim3635]

A fill point above the filter would suffice

[@bradmaas6875]

@@dylanzrim3635 I'd rather have the oil level as my high point, adding an extra point of leakage doesn't do anything for me either.

[@midixiewrecked7011]

@@bradmaas6875 red beard has more money than common sense. Don't be surprised.

[@bradmaas6875]

@@midixiewrecked7011 I think he's a good person who enjoys sharing his knowledge and old as I am I don't know everything

[@SportbikerNZ]

@@midixiewrecked7011 Couldn't disagree more.

[@frankbowman22]

I know I'm partially blonde and it takes a while for things to sink in LOL but wouldn't a vacuum pump work just as well

[@honeybadgeractual5734]

What if you used a pulse fuel pump on both sides of the system. One pulse pump mounted on the head pan, this pumps from the cooler to the head and block, it also reduces the load on the underside pump that's behind the filter and the cooler, allowing it to pull more quickly with less wear on the pump. So you can also set up an extra oil reservoir this way as well, like having a Harley oil can, so the oil catch can might work good for this, one pump can feed the can from the front oil plug, it pulls through the already saturated filter, then cooler, then pump, into the catch cans in feed, them at the bottom of the in feed you have another pump, cooler set up to push oil (that's already been cleaned so no need to further filter it) into the block and valve train from holes drilled into the tops then possibly have a pipe fitting that's internally threaded for a large size fuel jet (now an oil squirter) and OD threaded to fit the new oil cooled pulse system. This takes load off the electrical system and allows for more gizmos and gadgets to be run off the positive case pulse, while the fuel pump is still run from the intakes negative pressure pulse on intake strokes. 3 pulse pumps, a tangle of oil feeds, coolers, and a catch can, and maybe a few sight glasses added to the lines at various stages to allow for an idea of the flow rate and condition of the oil. For a REALLY high performance engine, this could become a great benefit, similar to normal liquid cooling, slightly less efficient than true liquid cooling, but it also doubles as an added oiling system by spraying lubricant directly onto the valve train, and the crank which adds to the engines already natural lubrication process. And should you ever begin to burn oil, you have an ample supply before you actually blow the engine from oil loss. Should the oil system fail in normal use, that's fine because it was a redundancy added to the existing oiling system to increase engine and oil longevity.

[@jamesh8272]

Cant wait until the alternator video! I have learned a lot watching your stuff! Can you address weather you are going to change up the charging coil like the "lifan video" or will it make a different. Thanks in advance

[@David-js6sg]

Your pump should be level and the filter with the crankcase possibly lower than the crankcase so the engine is not overfilled and can start and run good

[@jubileefan6079]

Thanks Greg!! Good stuff.

[@dubbedmodz7253]

This is bad ass bro!!!! Love it

[@josephsaucedo8691]

They are they also good to replace the stupid pulse pumps for a mod

[@David-js6sg]

Buy a external oil tank with a clear see thru tube on the side to see oil level

[@joelnrs]

These are great ideas!

[@gordonlovelace7406]

Cool!!! I like the idea too!!!

[@tblosser8921]

Robot cantina did a video on the cooler too

[@robsdeviceunknown]

I wonder about the efficacy of using a fuel filter for oil. Wouldn't it restrict flow with oil's higher viscosity? Causing pump to burn out faster? What oil did you use? Straight 30 or multi-viscosity?

[@daviddepuy9843]

Could you do a video using a pulse pump as an oil pump? It was a thought I had. Thanks.

[@anthony1113]

While I really enjoy the concept and absolutely love all your videos…is there any real benefit to installing like this on one of these engines

[@chasnelson5753]

engine runs alittle cooler , oil filtered and added oil capacity ! sounds like a win!!!🤠

[@Deucealive75]

Only benefit is the filter. There's no evidence that suggests these engines run too hot in the first place.

[@subshooting8414]

Be neat if you run it for X amount of hours and then cut open the old oil filter to inspect it. Curious to see what all it will catch.

[@KrimitWARFRAME]

maybe ya could find a way to spray water at the small oil radiator, when you are moving fast it could help get rid of alot of heat!

[@billbalke7572]

I do have a question , Why not return the oil thru the old governor hole instead of back to the drain hole ... it seems you would get even better lubrication to me and avoid the oil just shooting straight across and being recycled . Am I wrong ???

[@willieshaw2522]

The electric pumps push oil better than they pull, or suck. The pump would also work better mounting it even with the bottom of the engine. I would have put the pump in the system first, then the filter, then the cooler. To be honest, it will be interesting to see the pump life on this setup.

[@garyfraser8584]

First thing i thought was get the pump lower either even with the bottom or below so it gravity fed and will never be dry. That sight glass gas filter is a restriction i would lose it. Great idea overall.

[@shanehathaway491]

So the idea is to filter and cool!!?? Ok kool concept the heat as we know is what can kill an engine. That would be great if you could figure out a way to get oil to pressurize the rod and mine crank bearings….?!?! But now I understand the concept of what you did…. Kool keep them coming great job Sir…. Shane

[@Christian-ve9vb]

Clear fuel line would look cool

[@ardennielsen3761]

drill and tap a thermal switch in the side cover to automatically turn the pump on and off?

[@ibatibangkaalaman5040]

I like this engine

[@LeathermanSoftwash]

Gonna do this on my pressure washer

[@trentmiller7532]

Might be a strange question/ questions…. So, I have drains on the bottom, on BOTH sides of my 389cc engine. Should I have my oil pump pushing or pulling? I personally will have the filter last, going back into the other side (in case the oil pump deteriorates internally). Lastly, if the oil pump goes out at some point, I’m guessing that as long as the oil is contained, and the set up is not higher than the dipstick, it’s contained and all would be good?

[@jamesfalvey77]

I wonder about the longevity of that pump. I want do something similar