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The question is: How many hours will the Polini perform well? It´s a real unreliable engine if you are not a mechanic, and it´s better to always have some spare cylinders in stock. These 2 stroke engines are simply not designed for changing altitude or atmospheric conditions. Carburetor settings are always only a compromise as long as you can´t adjust the mixture to the altitude by EGT. Polini only can sell these engines in significant numbers because there is no alternative on the market.

😊 Thx for sharing, This kind of honest reviews really helps me in choosing the next setup, great video 👍

😍Polini Thor... Meu motor com aproximadamente 400 horas de voo e nenhum problema !!

450ft/min yikes 😬

You spinning 140's on both?

Many thanks @trent or sharing your experience , on 6:50 the message has typo error the RPM should be 8500 to 9000 isn't it ?

Where do you live at?

This was also a durability test, 3 min at WOT straight is asking a lot so why I made the comment. Notice I didnt say what they're capable or rated for, just pointing out WOT over minutes is a challenge in general. I'm just about 120 kg full tank, I burn 3.5 L/hr consistently. I also have it tuned properly more often than not.

And..... both are much better than EOS :)

I like the test. I went from a Nitro 200 to a PAP factory R and there was a world of difference except for the fuel economy. A little disappointed in the R fuel economy..

Hi ! I'm a french pilot with a PAP mini trike and a Thor 202 polini engine. I confirm your impressions : this thor 202 is the best polini engine. I fly with a Dudek Warp2 (20 m2) and a total weight of 140/145Kg (all included with gasoline and glider). I'm under 4l/h all trimed (50 km/h) and under 5l/h full untrim (65 km/h). Ans as you said ... very linear delivering power !!! Thx for your video.

I have a buddy that got one which had tons of issues before it blew a head gasket in less than 10hrs. The dealer that sold it basically told him to "deal with it" and that "he didn't have time to deal with his issues", then refused to answer any requests for warranty replacement. EOS really needs to work on vetting their dealer network in the US, as their current dealer is an asshole.

The best thing about 202 is that there's a self adjusting smarcarb for it, giving it all the advantages of a fuel injection without any of the cons

I would love to have the 202 but seen one melt a piston at a fly in and my flying partner just pulled the head off his for inspection to find the piston almost melted in the center. Just too much to try and get right on those tunes so I have to stick with the simplicity of the Moster, even though it drinks fuel. Can't wait for your fuel comparison!

How heavy is the whole paramotor?

Factory R is wicked if it's making similar thrust. Good call on tuning the 202 to optimal. I swapped a PWK onto my 202 to gain access to an array of pilots and needles to better optimize the tune; keyword is "at all RPMs." The Factory R has that price tag, where a 202 is nearly the cost of a Moster estart.

I have the Eos Quattro delivered to me at the end of January 2024. I fitted it myself to a P2F Evo8 replacing a Simo250. On the last but one flight I had a black fine coating on the prop and assumed this was just belt slippage rubber. On the next flight that took me to the 10hr service I again had black coating on my prop which again included fine rubber from belt slippage even though the belt was tight. On the 10 hr Eos Quattro service I found oil leakage from the backplate seal ( pull start side ) as you had. This was getting drawn onto the belt by the air movement causing the slippage despite good tension. I have tightened down the bolts on the plate to seal the gasket better and will monitor with a run on the ground ( as I fly it in a P2F Colibri trike this is fairly easy). Otherwise loving the Quattro. What I am not loving is the 3 blade E-Prop. It creates bad "harmonics" which becomes really annoying in flight. I posted a video in the Quattro owners group on FB (Paul Flyingfergus Coleman). Having spoken to Helix they have tested multiple props on the Quattro. I have a twin blade Helix prop they believe will give me similar thrust without the harmonics. Should arrive late this week so i can compare.

Nice, did you get rid of the Quattro?

Hey congrats!! I have a xenet with the cosmos but I’m at 200ft above sea level. Hey, is it me or does it seam your A-assist line was under tension during flight? Might be the angle we are seeing it but I feel like it should have a little slack in it.

Very thorough review. Thank you. Love the music.

Nice. And real world weights too.😊

On your follow-up, you should test climb rate and fuel consumption.

be interesting to see how it performs in the water.......grab an old dead engine and try it in a pool, I personally think ti will put pilot face down

You and I have a lot in common. As a brand new pilot I bought my Scout factory R 2 years ago. I have 188 hours on it and planned on getting the EFI but reconsidered. Today I ordered the Quattro. I’m sooo excited!!! It sounds AMAZING

Some freinds and I ran 503s on microlights. They had slight misses during cruise as the engine loaded up with crankcase fuel. My engine never had that problem & ran amazingly trouble free without loading up & missing. A difference was I had mounted the 503 inverted. The condensed crankcase fuel drops to the pistons eliminating any rich miss and probably helped cool the underside of the piston crown as well as increasing lubrication to the wrist pin bearings & rings. I also chose the single carb/single ignition 503, eliminating carb balance issues & essentially being a derated engine, allowed me to run at 100% power as long as I needed with less concern. I also found CHT gauges more useful than EGT on air cooled 2 strokes.

I had a bailey 4 stoke paramoter. I know mark who knows a lot about engine design. So after 30 hours it suddenly started blowing oil out of breather. Which went into carb. So much so the engine stopped. But not before 30 hours. So mush so I have a wing covering oil... half the oil dumpt in 30 min flight. Any way Mark said basically they were try ing to push to much power out of a over bored cylinder with air cooling and probably cause the barrel to warp, hence the ring don't seal any more. So took it back to bailey 4 times. New gasket, then the new head, then something else, then new bore. Fixed. But at the end of the day push it to much again then same problem so sold it. Loved the pur. Now on a moster

Great maintece! Trent, can you compare the vibration levels between EOS and Moster? The EOS design does not include balance shafts to reduce vibration, probably because of weight minimization.

I had a bailey. It did not have enough power for me; the EOS looks great improvement. I now fly a moster dual start and hat the noise of a two stroke. Drive me MAD!!! Four stoke always started easy.

Awesome

Thanks for the awesome video the immersion when going from a topic to the actual footage right there was awesome thanks for posting

Hi Trent, Are these 4 stroke motors popular, it seems not many CZcams people use them?

oil issue has never been solved from day one.

Thanks, Trant! Data on fuel consumption and engine RPM levels on different wings is very useful. Cruise flight on the EPIC 2 is indeed more comfortable but more slow.

The ideal Beta Tester, an OC mechanic

Nice comparison between the factory R and the EOS, I currently have a MY19 moster, and an air conception dual start nitro 200. And I’m going to Florida end of this month to get my tandem exemption at one up adventures. Cosmos 300 is my next purchase on a fly products strike

👍🏼👍🏼

Hi Trent, Great video, thank you for all the good information you provide in all your videos. I am about to get into PPG and are looking to start buying equipment. In your opinion, would the EOS 4strke be a good choice for trike flying ?

Awesome flight and video

Looks awesome!!

Is it still under part 103? Seems like you need a sport pilot license to fly that thing.

bro, how much fuel it will consume in 1 hour flight?

I think i want to install a dual carb kit on my fenix 503 , since a have the single one , some people say it will run not that properly others say big improvement. , i use a helix h40f 1,60 R-GMZ -07-3 . Do you use the same prop ?

Where can i find the cockpit ?

May you tell me which Type of Prop you are using?

i have a EOS 100 booster ill sell for $ 600 older model but runs good

I wish the EOS was EFI Cheers

Nice machine. Good thing you have an original 503. For the RMZ 500 there is absolutely no documentation and info about spare parts. The fact that it is a Russian Company, with all those restrictions because of the Ukrainian war, it is going to be hell to repair it when something breaks on that engine. To bad Rotax does not make 2 strokes anymore. The 582 is also out of production. I wish the manufactures switched over to Hirth engines.

Which direction does the propeller spin? Counter-clockwise?

Thank you for this comparison, I appreciated your mentality: "if I want to fly, I have to do mechanics" on all engines it is a reality but having had one of the first EOS 150 with a lot of problems... I think that this brand should hold back its production even longer... Although I am rather a fan of the 4-stroke, the vibrations could affect its reliability. In any case, happy to follow you and good luck. (this is a translation from French)

Im not a big EOS fan, and I would still like them to succeed and make a good product. Basically any PPG engine maker, we all win when they continue to improve and compete with each other. Its a tough business, because the majority of us are value oriented and all these engines reflect this.