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Old 02-17-2008, 02:14 PM   #1
mekrew
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why dont they make FI dirt bikes for motocross etc

when we were watching supercross yesterday, c0rey brought up the point why dont we have FI dirt bikes here in the states. I would figure for the pros in motocross would run something like this so when their bike goes down they dont have to kick start it 131212 times

just a random question im sure there is a simple answer im not aware of
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Old 02-17-2008, 02:17 PM   #2
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cost. plain and simple. but the newer bikes are quickly switching over to FI.
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Old 02-17-2008, 02:25 PM   #3
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i might also guess the sensitivity of the electronics. they may not hold up as well to 50 foot jumps and hard landings, especially crashes. and yes, cost...if you break them i would guess a single fuel injector/throttle body would be in the $500+range, whereas a single carb might be $100-$150 maybe? not sure on the exact numbers.

that being said, i think its a good idea, and we will see them eventually. factories will find ways to make the FI components more durable. maybe enclosing them in a shock-proof box, or just making them more robust in general.

at the same time the idea is rather disgusting (in a "OH " ) kind of way. 2 strokes are allready completly mental as far as acceleration, and that is using carbs. with FI it will take a real sense of control to keep the front end on the ground. it would be the easiest thing to loop on the planet.

not having to kickstart is a good idea, but you dont need FI for that. there are plenty of carbed dirtbikes with electric starts these days. the reason they dont use electric starters, is the extra weight of the alternator, the starter motor, etc. a kick start is basicly one small gear, a big spring and the kick lever.
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Old 02-17-2008, 04:37 PM   #4
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The 2008 Suzuki 450 dirt bike is FI. The KTM 450 dirt bike has electric start.
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Old 02-17-2008, 07:56 PM   #5
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Durability/cost and weight to a lesser extent. The durability and cost issue makes it prohibitive the mechanical environment of a street bike is a of a lot nice than the mechanical environment of a dirt bike. Electronics don't like large shocks and lots of vibration. There are two ways to counter this currently: beef up the design (adds weight and cost) or perform an environmental screening test on all the parts and select those that pass (adds a shitload of cost because you add in very expensive testing and essentially only keep those that pass knowing a small number statistically outperform other parts).
That said it will happen. Remember street bikes back around the change of the millenium (really cool to say that) as they were switching over?
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Old 02-17-2008, 07:58 PM   #6
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Not to mention that FI requires lots of electronic components. Most motocross bikes don't have a generator to power anything like that.
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Old 02-17-2008, 08:05 PM   #7
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My friend has a Cannondale 440 and its fuel injected and electric start and ohlins front and rear, awesome indeed, and I believe its about 5 years old, very high tech for an older dirt bike, those HUGE ohlins forks give me a woody everytime I see them, but he does have running issues with it sometimes, I think fuel pump problems
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Old 02-18-2008, 10:51 AM   #8
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like Mag said, Suzuki has a RM450 that's FI now. They were showing ads for them at the Supercross.
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Old 02-18-2008, 11:03 AM   #9
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Altough they are slowly switching over, it is a cost-to-race move, plain and simple. The same reason the wouldn't let KTM or Husqvarna, I can't remember which, race their v-twin motocrosser. Every jump in tchnology adds a cost element. They don't want motocrossing to be as costly as MotoGP.
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