kosmic / 100cc vortex vl98 @ lonato KFA 100cc series 22/05/17 Gil Mertens

kosmic chassis
vortex reed vl 98
fastest time 50:21
track - lonato italie
KFA 100cc series

[@Tzhetarrafrombe]

great to see that even 20 years later they are still chocking the engine while breaking! good times!

[@RC99mx]

What is the effect of choking the engine under braking?

[@JDTeam]

@@RC99mx when you run the engine flat out the fuel evaporating in the cylinder is what it keeps the piston from melting, when you let off the gas to break the piston is really hot, and it barely gets any fuel to cool it, and by choking the intake you increase the amount of fuel that gets into the engine giving it extra cooling and preventing knocking or even melting a hole straight trough it. I hope it was understandable

[@igorbabic6605]

@@JDTeam im 35 have engine vortex 100cc from 2008 still doin it that choke and love it :))

[@rgzpassion9757]

What a sound have this engine !!! Very good video, congratulation.

[@gilmertens8634]

thanks raf ! the sound is great indeed :D thanks !

[@TheCrimsonPlays]

Nice! Im doing a rebuild for my Simson S51 (GDR / DDR Moped) with a Vortex VA 95. I am so excited for the result. Original they made 3,4 HP, i hope i will get arround 25 HP ;) Greetings from germany!

[@Balzaniii]

Nice idea! We have plenty of those engines :D

[@sterotacromycopheno]

This is true karing, well done !

[@zacharyabdollahi7760]

This looks like so much fun!!

[@gilmertens8634]

yes shure my friend ! best karting thare is ! :D

[@RodrigoBmk]

Amazing!

[@mynameistechno]

last 3 laps wou were flying! fantastico

[@tokkai4578]

real kart and nice drive! the rpm are... two theth under for me ;-)

[@gilmertens8634]

thankyou!, this is indeed real karting, just love it ;)

[@hadrienpostic6604]

Freinages tatdif, drift, courbes non adequates, ne pas savoir sacrifier une courbe pour maximisé la sortie de la suivante... en gros, une belle vidéo de ce qu'il ne faut pas faire... après oui, chui jaloux du matos 🤣👍😉

[@icalculette]

Nice drivons skills

[@responmotorsport5451]

nice nioce good

[@KasperStoltze]

Great video Gil! Kosmic T4?

[@gilmertens8634]

yes mate, kosmic T4

[@Jean-Michellemonnier-sr6lz]

Mais on allait plus vite lollllll😂😂😂😂😂😂❤❤❤❤

[@Jean-Michellemonnier-sr6lz]

Le bon vieux temps

[@forzabike]

What do you do with the air box with your right hand?

[@kairogers809]

It’s a choke or he’s leaning the engine off

[@forzabike]

@@kairogers809 alright thanks 👍🏻

[@carloscotao-iracing5688]

5:32 what is he trying to do by moving his hand there all the time? And 5:48 ? Seems to be a different place

[@gilmertens8634]

Thatsbfor giving the engine more full, you shut off the air...very important, other time is you have 2 screws on the carburator, you can give the engine more ore lower full on the botthem ore high rpm wen the engine runs to lean ore to ritch

[@zaxm9475]

Hey Gil - very nice drive ! 😊 I also got me a 100cc Kart with a vortex VA/B - so it’s one generation earlier then yours I guess? Can you give me a hint on what sprocket you drive (axle and engine)? Maybe also carb? (I’m running a Walbro wb24) That would be awesome !!! - because at this time my max rpm isn’t even close to what you do for warm-up! Keep on racing 💪🏿💪🏿💪🏿

[@gilmertens8634]

hello Zax! thankyou, i run 10-86, bus with ibea carb, thats what you need, with a walbro you will not have the same as with Ibea carb , grtzzzz

[@bunta_wrx5851]

when 14k rpm were to heat the engine

[@nicelittlerunner]

You don't back off at all under yellows do you, is that good? It is until someone has their legs amputated

[@jorehaast9887]

U don't have to be fully off the throttle, just a little bit

[@tiger4108]

Yes I agree but you can keep going if you see the accident and know what not to do

[@nicelittlerunner]

@@tiger4108 Just lucky he didn't seize whilst at max revs at 6:28, or you'd have 4 broken legs. I'm sure he knew what not to do, not to have a mechanical failure

[@tylahrs]

@@nicelittlerunner ive seized an engine before at pfi going under the bridge at over 100kmh its not fun luckily didnt hit anything

[@faycal799]

Why you put your finger into that hole from time to time ? Its to keep the engine hot ? 🧐

[@flakey7832]

In a 2-stroke the lubrication is provided by the fuel that gets in the engine, it also cools down the piston. When you're at high rpm, the piston gets hot and so do all the bearings inside the engine. When you let off the throttle you interrupt almost completely the fuel flow, starving the engine of lubrication and cooling. If you do that you risk seizing a piston or getting the engine very hot and indicing very bad knocking/detonation which also will not make your piston very happy. You put the engine in front of the airbox to create a slight vacuum that increases fuel flow momentarily.

[@switchieskrtskrt597]

You have clutch? if yes tell the model pls nice video

[@Schultyedits]

Switchie Skrt Skrt theres no clutch, its direct drive

[@2006adfer]

You think that engine is faster than x30 ? I think the answer is yes and You? And other thing what's is the number of the sprocket ?

[@gilmertens8634]

i think its not faster, 100cc 20 years old . x30 new generation + 25 cc more, bud iff you have a good engine and good carburation it will be not slower , number sprocket 10-85

[@tiger4108]

Yeah I have an x30 and do not underestimate the kart in this video because it’s mad quick, but x30’s are the quickest single geared karts and are quicker

[@jeffbelter768]

Karts would be pretty close in times. X30 kart is 50 lbs heavier or more, 100 is very light and nimble handling. 100cc rebuild after every race weekend, x30 rebuild after 10hrs or so.

[@rpzpacific2332]

​@@tiger4108 Is an X30 quicker than a Rotax ? I think the Rotax is slightly more powerful but its power curve is a bit weirder so if you have any idea about which would be quickest.

[@jarrettbank]

This would eat an x30 for dinner. Older 100cc ICA's were pretty much no holds barred.

[@wazeuupp]

Awesome drive! Just one thing, what are you always checking with your right hand near the air intake? ;)

[@jorisvanheule6154]

chocking by putting the hand on the air intake to cool and lubricate the engine

[@diogopires5706]

Francisco Dias Rosa olá francisco

[@Jean-Michellemonnier-sr6lz]

Tourner sur crg rotax en ica aussi

[@maxy911]

why do you hold your air choke sometimes?

[@gilmertens8634]

its to give the engine extra full after the high rpm end straigt line

[@vittoriofoppiani9699]

What gears were you running?

[@gilmertens8634]

10-85 ;)

[@topperharley822]

Nicely driven!

[@jorehaast9887]

@@gilmertens8634 that's so small these, wow

[@oscarrafone]

how fast they go these karts???

[@boomshakalaka7383]

120 or so

[@bubbleboi3422]

How often do they need rebuilt

[@Luniemiester1]

Gabriel Altland when they were raced properly in the 90’s a new piston every 45 mins and a full rebuild at two hours to be safe (20,000rpms!)

[@teter129]

@@Luniemiester1 What does that cost?

[@flakey7832]

@@teter129 just the connecting rod alone is 180€, 60 for the piston, add alll the other stuff and you're looking at around 300€ per rebuild if you build it yourself

[@basili010]

Max speed?

[@Knallertpsykopaterne]

about 110kph