Oh and the engine didnt produce power @ 6:27 and forth, as he opened it up,he saw that it wasnt pulling at all and so he whent on the side and closed the throttle again. Offcourse if we dont hear out from NEC racing on what actually happened all we can do is speculate.
@Genetics7 i figured out what it is, its the main jet (atleast im pretty sure anyway) and that piece moving up and down is how it puts the right amount of fuel in according to how much air is flowing through the carb.
yep, and as i suspected the engine seized as he was off throttle. The fuel provides the two stroke engines with their required oil. When you cut off the fuel you cut off the oil as well. Now closing the fuel/oil mix on a motor running that high on rpm's is really hard on the internals. From what i saw/heard when the cart was running WOT it did not have any problem, so yea i cant say that the open carbs where the fault on this seizure.
I just noticed you have a Stockman Kart, i used to race against him in the early 1990's out at Amaroo....he was the man to beat back in those days. I was flagging at Amaroo one time and 2 dogs jumped the fence and ran onto the track infront of him...i had to black flag the race, im sure he would remember that day.
im pretty mechanically inclined, ive done plenty of work on cars, still do. I understand how fuel injection works 100%, but what i have yet to figure out is what the little slide thing on these type of small engine carbs is for, i know theres a throttle plate after the slide, but the part you see in this video in the carb that moves up and down. If that like a sort of fuel metering device? So as more air moves through the carb, it opens the jet up more or something?
Was it the left piston that went? Appeared your carbs were slightly out of sync, which will cause problems at below half throttle. The less those slides are closed, the more lubrication the engine will get. It's important to keep on the throttle with a two stroke, even if its injected.
man i love the exposed air intakes on the carb. i remember how cool even my rotax kart would sound with the airbox off. this must sound insane. i've always wanted 2 get into one of these.i'm driving fbmw now though, good stuff.
The only thing i can think of for overcoming this sort of problem is lifting the carb needle up a bit. But anyway, im sure those guys already have the remedy for that problem.
@avmaviator and whats your theory then...? and it sure takes fuel and oil but at way reduced quantities... Thats why when they set up the carbs according to the person driving it. Yours would end up like that probably if you revved it like him and kept downshifting trying to be constantly in the power band but i have a strong feeling that you are caring more for your motor, not ragging it constantly...
@p13ie Im guessing the engine is from an RS 250, i race an RS125 and we never run an air filter. Dyno testing showed a loss of 1hp when using an air-filter. Excellent footage.
Looks fun. I noticed that you used the engine to slow you down, forcing the engine to maintin high rev's with a closed throttle on a 2-stroke that is not oil injected is something that is unhealthy for 2-stroke engines since the the oil which is in the fuel is what lubricates the engine is not flowing enough to lubricate the engine while throttle is shut and engine is at high rev's. Just thought I'd mention that.
The engine siezed because the carburators are uncovered, at the speeds these karts race there is so much air tubulence that you can litterally see the fuel being sucked out of the carbs. it simply leaned out
Marek Sumguy Power. The engines on the karts are rebuilt so often, depends on the manufacturer but it is measured in hours. These intakes are rear facing. So the low risk is not a big price to pay with frequent rebuilds for about 1hp difference. On a small engine like that 1hp is about 1% of the power so definitely worth it if you want maximum performance. Some racers use filters some don’t. But the answer to your question is power and performance. This is racing, performance and safety are the only reasons. Edit: btw the lack of filters likely had nothing to do with the seizure.
just curious as to what caused the seize? what brand oil do these guys use? these karts are like comparing a ferarri to a mazda miyata for what im trying to acheive. i bought one of those bicycle engine kits off ebay but have been modifying the cylinder, piston and head a bit and i want to use a high end oil to help ensure it wont sieze up as well. what would you recommend? thanks for your time.
+G DK ive seen 22,000ks on race scooters and gp bikes. 2 strokes can rev high if tuned with a good pipe but all that makes is hp no tourqe. if you want torque get a good low end pipe like a chamber pipe or lowend tuned pipe. I personaly have hit 13,000 rpm on my acooter and another guy with the same block but an polini bore hit 17,000 and hes a armature like me. its all about the bore, crank, pipe. mostly money and skill.
Please, Two stroke motors overheat quicker because of the jetting not because of being a two-stroke. The reason the motor seized is because the way honda changed the construction of certain pieces of the motor. Now, it needs a different fuel jet so it can run at the proper temperatures. This "Stuck" because of the wrong jetting. *A "Jet" is the thing that squirts fuel into the carburetor intake. Then it also could have been from the wrong Fuel/oil ratio, this is racing, Shit happens.
@anothercbrowner Thats not correct. The engine started loosing power around 6:32-33 then it finally locked up. His plates were still open at that time (plus sound delay too) Your explanation for this seize has some logic in it, but it is wrong. Even when the carb is "closed" it is still getting fuel, and oil. If that was the case, there would be a LOT of dead engines out there, mine included...
how did you know was seized?cause i didnt hear a strange sound, i think u felt a drop of power/rpm in th emiddle range of power and u knew it wasabout to seize ;am i right?
Its a shame the motor seized. The footage is good, but its being driven that well. Its that fast at all. You can push a superkart much harder than that. I know you can.
On voit bien les boisseaux et l'air aspirai, D'AILLEURS S'EST UN MOTEUR DE 2.5CC MOTO🤔, CAR NON LONGITUDINALE MAIS EN TRAVERSE, PEUT DE PRODUCTION DE MARQUE comme VM motor 💞💞
my god this was so fast, so much more frightening than every formula 1 race i've ever seen, this was real hardcore, sorry for the engine man.
Oh and the engine didnt produce power @ 6:27 and forth, as he opened it up,he saw that it wasnt pulling at all and so he whent on the side and closed the throttle again.
Offcourse if we dont hear out from NEC racing on what actually happened all we can do is speculate.
@Genetics7 i figured out what it is, its the main jet (atleast im pretty sure anyway) and that piece moving up and down is how it puts the right amount of fuel in according to how much air is flowing through the carb.
yep, and as i suspected the engine seized as he was off throttle. The fuel provides the two stroke engines with their required oil.
When you cut off the fuel you cut off the oil as well. Now closing the fuel/oil mix on a motor running that high on rpm's is really hard on the internals.
From what i saw/heard when the cart was running WOT it did not have any problem, so yea i cant say that the open carbs where the fault on this seizure.
I just noticed you have a Stockman Kart, i used to race against him in the early 1990's out at Amaroo....he was the man to beat back in those days. I was flagging at Amaroo one time and 2 dogs jumped the fence and ran onto the track infront of him...i had to black flag the race, im sure he would remember that day.
If you watch the right front tire towards the end of the really long straight away you can see that it actually looks round along the surface.
man those carts fly looks like a blast thanks for posting
im pretty mechanically inclined, ive done plenty of work on cars, still do. I understand how fuel injection works 100%, but what i have yet to figure out is what the little slide thing on these type of small engine carbs is for, i know theres a throttle plate after the slide, but the part you see in this video in the carb that moves up and down. If that like a sort of fuel metering device? So as more air moves through the carb, it opens the jet up more or something?
you can hear the engine starting to go tight off turn two.
aww, man - that sucks. good run up until the siezure, though. hopefully you've gotten her back up and running since you posted this.
Super cool view looking into the carbs! Is that a dial-a-jet setup? It sounded like it started to tighten up a few seconds before it finally stuck.
Was it the left piston that went? Appeared your carbs were slightly out of sync, which will cause problems at below half throttle. The less those slides are closed, the more lubrication the engine will get. It's important to keep on the throttle with a two stroke, even if its injected.
I was interested watching the carbs open and close, then realized they seized it up. I wonder if it had any impact.
same here I was just watching those the whole time, lol
man i love the exposed air intakes on the carb. i remember how cool even my rotax kart would sound with the airbox off. this must sound insane. i've always wanted 2 get into one of these.i'm driving fbmw now though, good stuff.
Great driving mate..Shame about the seizure.
I enjoyed every second of this drive..
Oh and lovely slipstreaming...
The only thing i can think of for overcoming this sort of problem is lifting the carb needle up a bit. But anyway, im sure those guys already have the remedy for that problem.
the engine, you are seeing the slides go up and down and the fuel mixture of the carbs.
@avmaviator and whats your theory then...?
and it sure takes fuel and oil but at way reduced quantities... Thats why when they set up the carbs according to the person driving it.
Yours would end up like that probably if you revved it like him and kept downshifting trying to be constantly in the power band but i have a strong feeling that you are caring more for your motor, not ragging it constantly...
@p13ie
Im guessing the engine is from an RS 250, i race an RS125 and we never run an air filter. Dyno testing showed a loss of 1hp when using an air-filter.
Excellent footage.
@Frostman182 about 17,000/18000 rpm
Looks fun. I noticed that you used the engine to slow you down, forcing the engine to maintin high rev's with a closed throttle on a 2-stroke that is not oil injected is something that is unhealthy for 2-stroke engines since the the oil which is in the fuel is what lubricates the engine is not flowing enough to lubricate the engine while throttle is shut and engine is at high rev's. Just thought I'd mention that.
The engine siezed because the carburators are uncovered, at the speeds these karts race there is so much air tubulence that you can litterally see the fuel being sucked out of the carbs. it simply leaned out
Why no air filters??. This is idiotic!.
some people do run them others dont our kart hasnt ever had one but we regularly rebuild/clean the carby so we dont have many problems
Marek Sumguy Power. The engines on the karts are rebuilt so often, depends on the manufacturer but it is measured in hours. These intakes are rear facing. So the low risk is not a big price to pay with frequent rebuilds for about 1hp difference. On a small engine like that 1hp is about 1% of the power so definitely worth it if you want maximum performance. Some racers use filters some don’t. But the answer to your question is power and performance. This is racing, performance and safety are the only reasons.
Edit: btw the lack of filters likely had nothing to do with the seizure.
just curious as to what caused the seize? what brand oil do these guys use?
these karts are like comparing a ferarri to a mazda miyata for what im trying to acheive. i bought one of those bicycle engine kits off ebay but have been modifying the cylinder, piston and head a bit and i want to use a high end oil to help ensure it wont sieze up as well. what would you recommend? thanks for your time.
***** 18k is quite a lot... more like 14k from a 250 2 cilinder engine....
+G DK ive seen 22,000ks on race scooters and gp bikes. 2 strokes can rev high if tuned with a good pipe but all that makes is hp no tourqe. if you want torque get a good low end pipe like a chamber pipe or lowend tuned pipe. I personaly have hit 13,000 rpm on my acooter and another guy with the same block but an polini bore hit 17,000 and hes a armature like me. its all about the bore, crank, pipe. mostly money and skill.
Nasty! Those twin cylinder engines are expensive!
Please, Two stroke motors overheat quicker because of the jetting not because of being a two-stroke. The reason the motor seized is because the way honda changed the construction of certain pieces of the motor. Now, it needs a different fuel jet so it can run at the proper temperatures. This "Stuck" because of the wrong jetting. *A "Jet" is the thing that squirts fuel into the carburetor intake. Then it also could have been from the wrong Fuel/oil ratio, this is racing, Shit happens.
You pulled in the clutch before it locked up, how can you tell?
Because I watched this it obviously makes me an expert.
I think it was the flux capacitor...
That air shift gear box?
Water pump belt?
why didn't he have any air filters on it it probably sucked something in it
carbs seem a bit out of balance!
@anothercbrowner
Thats not correct. The engine started loosing power around 6:32-33 then it finally locked up. His plates were still open at that time (plus sound delay too) Your explanation for this seize has some logic in it, but it is wrong. Even when the carb is "closed" it is still getting fuel, and oil. If that was the case, there would be a LOT of dead engines out there, mine included...
What RPM are these engines topping out at?
how did you know was seized?cause i didnt hear a strange sound, i think u felt a drop of power/rpm in th emiddle range of power and u knew it wasabout to seize ;am i right?
I bet the first 6 and a half minutes of racing was worth it! I would love to do that once, sorry about the engine but i hate 2 strokes.
Whats the top speed on one of these?
rofl at the front tyres changing shape when going full speed @ the straight xD
so what actually happened was it to lean or what
Sorry my previous comment didn't read quite right. I ment its not being driven that well. I know you can drive superkarts much harder than that.
looks like a 250r engine would be better with its 6 speed gear box ,, and i think its also a overdrive in 6th
Learn't his lesson the expensive way, Always Run filters! 0.7 odd kw aint gonna win you a race, but seizing a motor can certainly lose one.
Damn radiator sprockets are always failing..
no airfilter....
It's youtube you will always get some internet experts commenting. Fuck em. Sorry to hear about you motor.
Its a shame the motor seized. The footage is good, but its being driven that well. Its that fast at all. You can push a superkart much harder than that. I know you can.
On voit bien les boisseaux et l'air aspirai, D'AILLEURS S'EST UN MOTEUR DE 2.5CC MOTO🤔, CAR NON LONGITUDINALE MAIS EN TRAVERSE, PEUT DE PRODUCTION DE MARQUE comme VM motor 💞💞
yeah they do
it seizes at 6:35 for all yall who want to see it seize
u where doin well to catch and overtake drivers!
@FUTHISS
These cars don't draft LOL
engine & carbs
250 km/t
I think it was a broken goobatron! I'm also a youtube expert on all things
good vid this
ahahaahahaha.. niece