100cc Kart - Engine seized at 100kph (60mph) - Kartbahn Kerpen (Erftlandring) | Hendryk Lichtenhagen

Unfortunately my day at the track ended quick because my engine seized.
I don't know why it happened. If anyone knows why this happened please let me know in the comments.

#karting​ #crash​ #100cckart​

Driver : Hendryk Lichtenhagen
Team : Panda Racing Team (PRT)
Car : Tony Kart 100cc
Track : Erftlandring / Kerpen

[studog]

That was what I call a "cold seize" caused by many different things that can easily be avoided, well the next time anyway :). Unlike the newer engines that have a nikasil bore/aluminium bore, that motor has a cast iron bore sleeve (looks like a Vortex). The aluminium piston increases in size quicker then the cast iron as the motor comes up to temperature, water cooled makes this a slower vs air cooled. Being water cooled the piston and bore can run a finer clearance then an air cooled too, however you need to warm these up for a few laps first before pulling 18K down the straight. The tune was out, too lean in the mid range and on the high end jet, plus you where running way to many teeth for a casual day out at the track. A two stroke that is on tune should four stroke/run rich down the straight when its cold and clear up when its up to temp. Rebuild the motor and learn how to tune the carb get the motor to four stroke on the straight and then screw in the high end jet so it just doesn't and then tune the low jet so its pulling out of the corners but not four stroking in the midrange. These things are great fun to run but they are not a Rotax Max they are a real race engine and need to be run like one. Driving style has I lot to do with it also, you can not have long periods off the throttle especially before that main straight, if you do, you need to choke the engine with your hand with the throttle open before long parts of off throttle, long braking areas and sometimes in long tightening sweepers. No throttle = no fuel = no oil = no friction modifiers = heat = piston size increases = seize, that's why a two stroke engine will almost always seize as soon as you take your foot of the gas because there is no longer oil mixed fuel lubricating the engine. Hope this helps, btw I have run these things for over 25 years.

[kevin_sull]

You can hear that wanna go pop from the get go

[ZanderTA]

Damn this guy is fast, running 104 kph. 1:37

[SRKarting]

You could hear from the start the carb settings were wrong.

[connorsmith]

You could definitely tell the jetting was wrong by the sound. Lean, caused it to seize. Not sure how the temp is read on these, but in my VLR 100 I religiously watch the EGT to make sure it isn’t exceeding 1200.

[RedExions]

The engine already sounded like it was going to die from the beginning

[AllBlacksRWC]

Many years ago we used to have the same problem with Rotax motors; just as you take your foot off the gas the engine seizes. After taking the motor apart each time we discovered the gudgeon pin had fallen out. Tried different circlips and the problem stopped.

[C.Fecteau-AU-MJ]

At least he didn’t spin out on any banana peels or get nailed by a turtle shell

[rxw]

The graphics on this are sweet, what software are you running?

[danmyers]

Back around 1970 I had a mini bike with a Hodaka 100cc 2 stroke motorcycle engine. I remembering day I was driving down a road and the engine suddenly seized locking up the back tire. I waited about 20 minutes and once the engine cooled down I was able to start it back up and drive away like nothing happened! Guessing at a minimum it probably scored the cylinder wall up pretty good.

[Greg_Chase]

AIR LEAK

When you read all the other advice, just remember this about 2 strokes. It doesn't matter if the piston is cast aluminum and the bore is iron, or etc.

1) tune the carbs perfectly - pilot jet, midrange jet, main jet
2) run through the entire RPM range then pull the spark plug and make sure it's not too lean - you should know what a proper spark plug looks like if the carbs are tuned correctly
3) and STILL, if a small air leak develops, even if 1) and 2) are correct, the air leak will kill the engine

There are lots of reasons why an air leak (which instantly leans out the mixture by suddenly adding too much air to the fuel-air mixture) can happen INTERMITTENTLY (heat, vibration, etc) but CHECK THE INTAKE MANIFOLD and anywhere else on the intake side of ANY 2-stroke engine for cracks etc.

We use starter spray (such as "Blaster Starter Fluid 11 Oz Fast Acting Engine Spray Start in Extreme Weather") and spray it around the intake side of the engine:
- when the engine is cold
- when the engine is warm
- when the engine is hot

If you are CAREFUL and JUDICIOUS and use a minimum amount of starter fluid spray, and control its dispersion, listen for the RPMs to climb.

The RPMs should NOT climb if the intake side of your engine is air-tight (ie. no outside air gets in except through the air filter). If you hear the RPMs climb under different temp conditions when testing with starter spray, you may have an air leak.

My background is with 2-stroke motorcycle engines and those freaking air leaks suck, and are unhealthy for the engine. You can troubleshoot air leaks with starter fluid spray as above. If you replace all the intake parts, you must still check for air leaks with starter fluid spray. Good luck!
.

[druginducedfeverdream]

That sucks but damn you did well to keep it on the track when the rears locked up.

[elitedavidhorne]

So that's why I see karters cover the air filter on long straights. To stop this from happening.

[AdmVrln]

each time I watch these carts, I want to fit a gearbox and ratios to them... :/

[rajgill]

Aw man, this is why I always add a little more oil to my premix just in case xD

[marcelwelter]

I wouldn't pay much attention to the comments about the jetting because the engine was cold and there is no way of telling. But because of the same reason, you shouldn't be pushing so hard... warm up the engine for a couple of laps before revving so high or warm it up before practice so you don't lose track time. Your engine will certainly last longer.

[EgebartJesper]

Carb settings not right, easy to hear.

Also if you are running fuel with ethanol, and did not change the membrans in the carb. If they go bad, nothing you can do..

[Hackenbaker]

One engine more walking to the heaven of the engines.

[CT--ogiv]

It happened to me about a month ago, it was painful to hear my 125cc honda engine break, first I starting losing power, then the engine died just before the pitlane entrance (that was lucky), then I saw my piston and ring absolutely gone 😔

[Username_Invalid]

Anytime you get stuck like that on track make sure to wave your arms in the air like crazy to let other drivers no there is a problem then get out quick.

That’s kinda scared me knowing other drivers were coming.