Water pump drive broke, engine head and barrel overheated (no circulation),soft plug blow out by steam pressure, soft plug fell into cam drive locking it all up. Run time after freeze plug came asunder unknown.

Eric over at I Do Cars is a legend. Great to see you following his format with the bike engine. It is also like watching an Allen Millyard video in reverse.

Great video Mr. Robot! Funny and informative.

Great video Robot! I have watched "I do cars" for a while now and really like it. You did a great job keeping things moving and interesting with valuable comments. I have a 09 Aprilia Scarabeo 500 and have been having a surprising amount of fun with it. I have had all kinds of bikes in my past, but have found the fun of scooters. I also have 2 Yamaha Majesty 400's that I commute with. Anyway, love what you do and enjoy your videos, thanks for sharing with us!

Grazie per i tuoi consigli , mi sono stati utili per l'acquisto della mia nuova Vespa 300 gts htec

Enjoyed the video very informative

Thanks for posting. A bit of an unusual one, but interesting all the same. This does add weight (If ever it was needed, ) to the manufacturers advice to keep up with the regular oil changes on an internal combustion engine. (Motor.) With regular servicing, these things can last a lifetime. Only this morning I saw a 1966 Honda 250 motorcycle pass me on the road, that has been in regular use since new. Forget the proper servicing regime and that drops to just a few thousand miles!

I think you are correct, the sprag reached it's maximum operating range. I'd hazard a guess a high speed down hill overwound it. Keeping in mind water/coolant when hydro locked acts like a solid. With no water pump it overheated until something locked up the cam gear chain and it threw itself off the cliff.... I'd call this abuse, not a defect.

Thank you very much

I have driven my Vespa flat out on a racetrack and got maybe a smallish scrath on the sidestand. To make these severe marks on the stand the bike must been driven very fast, heavy loaded with the softest suspension setting.

Some small Honda industrial engines use a rubber timing belt that runs in oil. Works fine.

Great

The more I watch these videos, the more I want to sell my Honda Helix and get a GTS 300.

Robot Great video! I'm thinking it was low on oil overheated popped it's cork (freeze plug) then, coolant mixed with oil and over temp runaway with metal grinding on metal. The timing chain failed I'm thinking because the variator was loose and allowed the timing sprockets to ride off the crank woodruff key then the valve timing was compromised...

How many miles did the engine have on it ?

Valve sealing should be checked with gasoline or brake clean etc. Water has higher surface tension and it won't show the smallest leaks ;) Of course it will show if the valves have huge leak like in this HPE motor.

Cost around to fix?

I think the thermostat housing is not retrofittable, the new one doesn't have a hole for bleed at the bottom.

hpe engine have piston oiljet ?

I have 2 hpe engines to be rebuilt. Both of them had rod knock noise. Surprisingly the one i have dissassembled the cranck and rod seem ok but pistón and cylinder are scored badly..........i can only think that the origin of the noise is the pistón tinkering in the cilinder........tempted not to change the crankshaft as they are around 300€......

it was never serviced, it has original oil filter

1) starter motors in Vespas last a long time? I just replaced the starter in my 2009 GTS250ie at 15k miles. The brushes were totally worn and there are no rebuild kits. Fortunately a $45 new Chinese starter from Amazon did the trick. I have original starters in two of my Japanese bikes with 254,000 and 154,000 miles with no issues. 2) What is the “incorrect rear wheel mounting” that will ruin the axle?

did you find the freeze plug

Robot.........we're called Gearheds.............not Motorheads. Never liked that band anyway...LOL. Dennis, the old dude on the silver LX................... :) But on a serious note Robot. I love how you actually play a detective role is explaining why the motor got "fouled up." Second serious note Robot. As a former car mechanic, it begs the question....what caused the overheating? Water pump failure? Clogged line in or out?

Why is a 2021 engine ruined, what happen.

He should, have read the handbook. "Dill brain"

@vespa motorsport can i use 10w40 full synthetic in warm weather all year around ?

Owned by a irresponsible kid that lives off mommy and daddy’s money I bet. Motors don’t lie.

How much does a motor like this cost and how much would labor be to install?

X files 🕵. 👍 😂

是騎士操作不當保養不確實🤔生產地在越南引擎組裝有瑕疵😂

is sad that bad service or inconpetence destroyed this engine only from 2021 . it could have lasted 100 yrs . also scary may be sabotage ? treat your mechanic good . tip them . get a bad vibe ? dont come back ? that is why i wanna go electric .

Soo many parts i could of used, im cringing everytime i hear you chuck something in the trash bin 😔

it was possibly abused by the owner

Failed because of bad driver.😂

What happened

It is really annoying to see you throw those parts around. Somebody trash is someone's treasure.

Have to say, throwing a lot of these parts is terrible for the environment and sustainability