yfz450 free mods - Yamaha ATV Forum
 
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post #1 of 13 Old 10-11-2011, 06:13 PM Thread Starter
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yfz450 free mods

i have an 08 yfz450 its stock and im looking to get some more power without spending much money. any help?
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post #2 of 13 Old 10-17-2011, 10:44 AM
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rejetting is cheap. comes lean from the factory.
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post #3 of 13 Old 11-30-2011, 10:11 PM
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cam mod and take the lid off your air box
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post #4 of 13 Old 12-22-2011, 08:13 PM
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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.
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post #5 of 13 Old 12-22-2011, 10:23 PM
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Quote:
Originally Posted by skitchin1 View Post
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"

...............................
.
I think your numbers are off by a bit. No way will those 4 things increase you up to 50hp. Your looking more at 2-5hp with the free mods.
And as far as running a synthetic, go ahead. Just that synthetics are not designed to run with a wet clutch. Going to jack that up by running a synthetic.

Check out yfzcentral
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post #6 of 13 Old 12-24-2011, 06:44 AM
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Quote:
Originally Posted by cloudpump View Post
Quote:
Originally Posted by skitchin1 View Post
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"

...............................
.
I think your numbers are off by a bit. No way will those 4 things increase you up to 50hp. Your looking more at 2-5hp with the free mods.
And as far as running a synthetic, go ahead. Just that synthetics are not designed to run with a wet clutch. Going to jack that up by running a synthetic.

Check out yfzcentral
If you buy a synthetic thats designed for wet clutches you'll be fine.........and they do make it mobil 1 4t full synthetic is made for wet clutches
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post #7 of 13 Old 01-01-2012, 12:21 PM
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all the racing motor oils I have found all say wet clutch compatible, look for that on the bottle. amsoil is designed for wet clutch and castrol now makes a synthetic that is wet clutch compatible. as far as mods go look at gt thunders website, they did a dyno with the cam mod and it made an extra 8 hp.
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post #8 of 13 Old 02-23-2012, 06:00 PM
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the cam mod is more for low end than top right? i think im gonna give it a go this weekend.
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post #9 of 13 Old 02-26-2012, 05:39 PM
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holy hell! i could feel the difference from doing that cam mod. i cant hardly hit the rev limiter.

2004 YFZ. zip tie, cam mod, ehs lid/K&N. HMF Ballance Pro series fully, 13t front sp. 175m, 48p, NCVQ 4th clip, 2 turns out. 1000ft.
burgard +2 stem, tusk nerfs, ricky stator uppers,hiper carbons,pro taper, ASV levers. ect.
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post #10 of 13 Old 03-05-2012, 09:23 AM
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2010 yfz450x cam mod

do the cam mod work for 10 yfx450 as well?
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post #11 of 13 Old 03-06-2012, 10:03 AM
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Good stuff
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post #12 of 13 Old 06-11-2012, 11:24 AM
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Holy Zoombie (back from the dead) Threads...but, good question.

Quote:
Originally Posted by Yfz450xJockey View Post
do the cam mod work for 10 yfx450 as well?
I have the same question as I just picked up a left over 2010 x Bill Ballance

Thanks!

seeker of inner peace and spiritual tranquility
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post #13 of 13 Old 06-11-2012, 06:29 PM
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Cam mod is not for fuel injected models.
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