fuel injected vs. carb

[dunecrazy95]

hey guys just wanted to know your thought about the two and which one you'd rather have. also why you'd choose one or the other and the pros and cons of he two. I'm new here so just want to get a little informed

[YFZMan2010]

Originally Posted by dunecrazy95

hey guys just wanted to know your thought about the two and which one you'd rather have. also why you'd choose one or the other and the pros and cons of he two. I'm new here so just want to get a little informed

Chose the fuel injection because it was the latest and greatest thing. Easier starting, NO CHOKE, and more power (debatable I'm sure). More complicated and expensive to tune, but its more precise (down to the % throttle and rpm's). But 3 dollar jets are much cheaper than a couple hundred dollar dyno bill. Hope this helps

[wyattski]

Actually you can get more go out of a carb than efi and cheaper...

[SuperCrew]

Originally Posted by wyattski

Actually you can get more go out of a carb than efi and cheaper...

This is a completely true statement. Ok now as far as which one is better as someone who has owned several of the original YFZ's and only rode a couple of YFZ X models I will say this. Hands down power will go to the origianl one. With that being said the ergonomics and comfort level is much better on the new R/X. I have had the chance to ride a fully built XC X-model and the main thing I like is the wider seat, other than that I will stick with the original. By the time you get the EFI ones where they are making good power you could have already had the Carb'd ones with the same power and started to work on suspension upgrades.

Now if your going to just trail ride, and your not worried about the suspension upgrades definitely go with one of the EFI models. Hope this helps

[badazz450]

Go carb more power and cheaper fuel injection is just more smooth

[skitchin1]

just have to put the wrench time in to carb. and not plug and play.

[dunecrazy95]

thanks for the help guys! i have a carb'd yfz all stock. i want to start upgrading and start raising some serious horsepower. what should i get to start off and what will make the most power for starting bolt ons before working into the motor?

[yfz450rider51]

id put on a fmf jet kit an pull the spark arrester from the muffler along with kn airfilter and no decklid.. cheap an will give a bit more power and sound, or new pipes depends if u got money or not ha. thats all iv done to mine and i felt a pretty good difference, im wut u would call on a budget ha.

[skitchin1]

this is copied from some one.

Far as mods for "Free Power",,

1) Do the "CAM TIMING MOD"
that makes a Large change.
(Google it,,,a buncha places have instructions with pictures,etc)

2)Remove air filter lid

3)Remove the Spark Arrestor in the Exhaust

4) Advance the ignition timing a LITTLE

You MUST rejet the thing.
Figure about $20

You NEED to use premium quality Synthetic Oil,,,thats a few $$$

It'd be WISE to use a NGK IRIDIUM plug,,,about $10

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,…
As-Is ,,,your 450 makes about 40HP @ 8,000.

Power falls drastically after that---engine just runs out of breath

By 10,000 it's about 28 hp

The above listed Mods will raise it to about 50HP.

But Far more importantly,,,it fattens the power curve AFTER the stock 8,000rpm Peak.

Power falls off far,far less and much "slower"

It will actually Pull all the way to over 10,000 rpm.

And make as much power over 10,000 as it does Now,,MAX.

An approx 25% gain in Power,,,
at an approx 25% Higher RPM,,,,
WILL put an end to your complaining about "Not Fast enough"

Your stock motor Suffocates,,,and cannot even wind-out Hi Gear.
And just piddle-farts around ,,,slowly revving out the lower gears as it power falls like a rock.
Basically "Over Revving" beyond it's Peak

The above mods will make it BEHAVE like a real Race Engine.
It will pull Strong until it quits revving.

How well you TUNE it,,,ie Jetting and Ignition Timing,,,will determine Total HP Number.

You can find How-To's allllllll over the internet on each mod.

It'll outperform $500~1,000 worth of Bolt-On crap.

And it does NOT really bother the engine at all.
Those motors are set -up sorta odd , originally.
It's almost a a form of restriction.
The Mods,,,set everything closer to "Optimum",,,
or how Yamaha COULD-HAVE chosen to set it up.

So it's no freaky,oddball stressful Hop Up Hatchet job.

Not a bad deal,,,for "Free"

...............................
Lastly,,and NOT Free,,,
get 2 countershaft sprockets.
1 tooth Larger than stock,,
1 tooth Smaller than stock.

Your motor will NOT rev to it's Max RPM in stock form.
After the Mods,,,it WILL.

A SMALLER front Sprocket ,,,,with the extra RPM's from the Mods,,,will go FASTER top speed,,,,but also have Much Greater acceleration when pulling thru the gears.

The 1 tooth Larger,,,will go a lot Faster top speed,,because the engine can pull it to a much higher rpm than the stock motor can

Gearing is optional,,,,having the Stock gear,,and a +1 & -1 gives you a Bunch of flexibility to dial it in for Where & How you ride.

get a full exhaust. for cam mod your all ready there when you check the valves.

[dunecrazy95]

Originally Posted by skitchin1

this is copied from some one.

Far as mods for "Free Power",,

1) Do the "CAM TIMING MOD"
that makes a Large change.
(Google it,,,a buncha places have instructions with pictures,etc)

2)Remove air filter lid

3)Remove the Spark Arrestor in the Exhaust

4) Advance the ignition timing a LITTLE

You MUST rejet the thing.
Figure about $20

You NEED to use premium quality Synthetic Oil,,,thats a few $$$

It'd be WISE to use a NGK IRIDIUM plug,,,about $10

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,…
As-Is ,,,your 450 makes about 40HP @ 8,000.

Power falls drastically after that---engine just runs out of breath

By 10,000 it's about 28 hp

The above listed Mods will raise it to about 50HP.

But Far more importantly,,,it fattens the power curve AFTER the stock 8,000rpm Peak.

Power falls off far,far less and much "slower"

It will actually Pull all the way to over 10,000 rpm.

And make as much power over 10,000 as it does Now,,MAX.

An approx 25% gain in Power,,,
at an approx 25% Higher RPM,,,,
WILL put an end to your complaining about "Not Fast enough"

Your stock motor Suffocates,,,and cannot even wind-out Hi Gear.
And just piddle-farts around ,,,slowly revving out the lower gears as it power falls like a rock.
Basically "Over Revving" beyond it's Peak

The above mods will make it BEHAVE like a real Race Engine.
It will pull Strong until it quits revving.

How well you TUNE it,,,ie Jetting and Ignition Timing,,,will determine Total HP Number.

You can find How-To's allllllll over the internet on each mod.

It'll outperform $500~1,000 worth of Bolt-On crap.

And it does NOT really bother the engine at all.
Those motors are set -up sorta odd , originally.
It's almost a a form of restriction.
The Mods,,,set everything closer to "Optimum",,,
or how Yamaha COULD-HAVE chosen to set it up.

So it's no freaky,oddball stressful Hop Up Hatchet job.

Not a bad deal,,,for "Free"

...............................
Lastly,,and NOT Free,,,
get 2 countershaft sprockets.
1 tooth Larger than stock,,
1 tooth Smaller than stock.

Your motor will NOT rev to it's Max RPM in stock form.
After the Mods,,,it WILL.

A SMALLER front Sprocket ,,,,with the extra RPM's from the Mods,,,will go FASTER top speed,,,,but also have Much Greater acceleration when pulling thru the gears.

The 1 tooth Larger,,,will go a lot Faster top speed,,because the engine can pull it to a much higher rpm than the stock motor can

Gearing is optional,,,,having the Stock gear,,and a +1 & -1 gives you a Bunch of flexibility to dial it in for Where & How you ride.

get a full exhaust. for cam mod your all ready there when you check the valves.

wow thats great info, I'm not very good with engines and not really much on the mechanical side so i have no idea on how to do the cam mod and don't know anything about the ignition timing so I'm hesitant on doing the cam mod because i don't want to mess up

[Chops]

cam mod, no airbox lid and spark arrester and jetting will add 10HP??

that sounds a little far fetched to me.

[Narmasil]

Remember with Cam mod you lose bottom and gain top. I really dont like this as i dont like to shift :)

[jonnymonofrax]

Made my own aluminum airbox used stock rubber intake with uni filter and origanal plastic air cleaner insert no lid 162 main jet 2, turns on pilot and used pipe unreal differance in power and throttle reaponse

[climb-101]

Originally Posted by dunecrazy95

thanks for the help guys! i have a carb'd yfz all stock. i want to start upgrading and start raising some serious horsepower. what should i get to start off and what will make the most power for starting bolt ons before working into the motor?

a really good job, serious power = serious money

[BlueShark450]

Originally Posted by skitchin1

this is copied from some one.

Far as mods for "Free Power",,

1) Do the "CAM TIMING MOD"
that makes a Large change.
(Google it,,,a buncha places have instructions with pictures,etc)

2)Remove air filter lid

3)Remove the Spark Arrestor in the Exhaust

4) Advance the ignition timing a LITTLE

You MUST rejet the thing.
Figure about $20

You NEED to use premium quality Synthetic Oil,,,thats a few $$$

It'd be WISE to use a NGK IRIDIUM plug,,,about $10

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,…
As-Is ,,,your 450 makes about 40HP @ 8,000.

Power falls drastically after that---engine just runs out of breath

By 10,000 it's about 28 hp

The above listed Mods will raise it to about 50HP.

But Far more importantly,,,it fattens the power curve AFTER the stock 8,000rpm Peak.

Power falls off far,far less and much "slower"

It will actually Pull all the way to over 10,000 rpm.

And make as much power over 10,000 as it does Now,,MAX.

An approx 25% gain in Power,,,
at an approx 25% Higher RPM,,,,
WILL put an end to your complaining about "Not Fast enough"

Your stock motor Suffocates,,,and cannot even wind-out Hi Gear.
And just piddle-farts around ,,,slowly revving out the lower gears as it power falls like a rock.
Basically "Over Revving" beyond it's Peak

The above mods will make it BEHAVE like a real Race Engine.
It will pull Strong until it quits revving.

How well you TUNE it,,,ie Jetting and Ignition Timing,,,will determine Total HP Number.

You can find How-To's allllllll over the internet on each mod.

It'll outperform $500~1,000 worth of Bolt-On crap.

And it does NOT really bother the engine at all.
Those motors are set -up sorta odd , originally.
It's almost a a form of restriction.
The Mods,,,set everything closer to "Optimum",,,
or how Yamaha COULD-HAVE chosen to set it up.

So it's no freaky,oddball stressful Hop Up Hatchet job.

Not a bad deal,,,for "Free"

...............................
Lastly,,and NOT Free,,,
get 2 countershaft sprockets.
1 tooth Larger than stock,,
1 tooth Smaller than stock.

Your motor will NOT rev to it's Max RPM in stock form.
After the Mods,,,it WILL.

A SMALLER front Sprocket ,,,,with the extra RPM's from the Mods,,,will go FASTER top speed,,,,but also have Much Greater acceleration when pulling thru the gears.

The 1 tooth Larger,,,will go a lot Faster top speed,,because the engine can pull it to a much higher rpm than the stock motor can

Gearing is optional,,,,having the Stock gear,,and a +1 & -1 gives you a Bunch of flexibility to dial it in for Where & How you ride.

get a full exhaust. for cam mod your all ready there when you check the valves.

Now taking off the lid in the air filter box, what would happen if you got sand or something in it? I don't understand, or water, so wouldn't it hurt it to take the air filter box off?

[omarlekphet]

Originally Posted by BlueShark450

Now taking off the lid in the air filter box, what would happen if you got sand or something in it? I don't understand, or water, so wouldn't it hurt it to take the air filter box off?

dude when you remove the air lid off you have to be careful with water k? cuz it gives you more power in the sense you will feel it, no water should go in, but dust you can keep servicing once a month depending how often you ride

[Anex570]

Yes it hurts a lot. You just have to use discretion when you run with no lid. The paper/fabric filters also harm your engine with dust as well. If you watch pro riders, they won't go that fast in water, and avoid water/mud holes to avoid any of that getting in the intake. I run something like this with a foam filter as a primary.. There's a little loss in power but it's worth it for me to keep the engine from destroying itself with dirt, water and mud.

[scarecrow]

Originally Posted by skitchin1

this is copied from some one.

Far as mods for "Free Power",,

1) Do the "CAM TIMING MOD"
that makes a Large change.
(Google it,,,a buncha places have instructions with pictures,etc)

2)Remove air filter lid

3)Remove the Spark Arrestor in the Exhaust

4) Advance the ignition timing a LITTLE

You MUST rejet the thing.
Figure about $20

You NEED to use premium quality Synthetic Oil,,,thats a few $$$

It'd be WISE to use a NGK IRIDIUM plug,,,about $10

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,…
As-Is ,,,your 450 makes about 40HP @ 8,000.

Power falls drastically after that---engine just runs out of breath

By 10,000 it's about 28 hp

The above listed Mods will raise it to about 50HP.

But Far more importantly,,,it fattens the power curve AFTER the stock 8,000rpm Peak.

Power falls off far,far less and much "slower"

It will actually Pull all the way to over 10,000 rpm.

And make as much power over 10,000 as it does Now,,MAX.

An approx 25% gain in Power,,,
at an approx 25% Higher RPM,,,,
WILL put an end to your complaining about "Not Fast enough"

Your stock motor Suffocates,,,and cannot even wind-out Hi Gear.
And just piddle-farts around ,,,slowly revving out the lower gears as it power falls like a rock.
Basically "Over Revving" beyond it's Peak

The above mods will make it BEHAVE like a real Race Engine.
It will pull Strong until it quits revving.

How well you TUNE it,,,ie Jetting and Ignition Timing,,,will determine Total HP Number.

You can find How-To's allllllll over the internet on each mod.

It'll outperform $500~1,000 worth of Bolt-On crap.

And it does NOT really bother the engine at all.
Those motors are set -up sorta odd , originally.
It's almost a a form of restriction.
The Mods,,,set everything closer to "Optimum",,,
or how Yamaha COULD-HAVE chosen to set it up.

So it's no freaky,oddball stressful Hop Up Hatchet job.

Not a bad deal,,,for "Free"

...............................
Lastly,,and NOT Free,,,
get 2 countershaft sprockets.
1 tooth Larger than stock,,
1 tooth Smaller than stock.

Your motor will NOT rev to it's Max RPM in stock form.
After the Mods,,,it WILL.

A SMALLER front Sprocket ,,,,with the extra RPM's from the Mods,,,will go FASTER top speed,,,,but also have Much Greater acceleration when pulling thru the gears.

The 1 tooth Larger,,,will go a lot Faster top speed,,because the engine can pull it to a much higher rpm than the stock motor can

Gearing is optional,,,,having the Stock gear,,and a +1 & -1 gives you a Bunch of flexibility to dial it in for Where & How you ride.

get a full exhaust. for cam mod your all ready there when you check the valves.

Dont listen to the power figures in this post. Its way off

Actually just ignore that post cause most of it is a lot of crap.

[joshsdaddy]

yeh i beat my buddies worked 09' every time with my 05. Mine has more torque also. But gotta admit his is alot more comfortable to ride, and out handles mine by far.

[Scottyamaha]

Carbs you can control the fuel much better imo. Fuel injection comes with electronics, and electronics = added weight and problems. That is just me though, Yamaha is releasing the new carbureted YFZ this year too.