Yfz450 Cam Mod - Page 2 - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums

ugotbit · 11-18-2006, 09:40 AM

Awsome post man. This has cleared up any concerns that I had about the cam mod. The pics, the step by step, its all great!

**Terse** · 11-19-2006, 03:20 AM

Quote:

i read this last nite and did the mod in my shed in about a half an hour. this article was great if it wasnt for this i wouldnt have done it. i think i need to change my needle to make it richer though it kinda bogs down low when i crack the throttle. any tips would be appreciated and again thanks for putting this up!!!
[/b]

What is your jetting now? Some people have had to richen their pilot jet a size. Congrats on doing the "mod"

cheekyslag · 11-19-2006, 08:49 AM

Quote:

What is your jetting now? Some people have had to richen their pilot jet a size. Congrats on doing the "mod"

[/b]

im stock settings on an 05 . i did the airbox mod and thats pretty much it for the motor.

**Terse** · 11-19-2006, 01:54 PM

richen up the pilot jet 1 size.

greasemonkey · 12-24-2006, 07:33 PM

well ive read this thing a million times. i wanna do the cam mod sooo bad. but i dont have the courage to open up the 4-stroek up by myself. so i called my buddie his dads a mechanic( owns his own atv/ bike repair shop) and he does alot of race bikes and quads. he said he woudl help me do it. all its gunna cost me is to ge tmy bike down there and back and a case of beer( after the wheeler is done)

stuff105 · 12-28-2006, 05:27 PM

can this mod be done with a wr crank kit ?

**Duane** · 12-28-2006, 05:41 PM

Quote:

can this mod be done with a wr crank kit ?
[/b]

Yes.

yfzrider8 · 01-09-2007, 08:18 PM

thanks man, it is well written and you did a good job on it.

Dano22 · 01-22-2007, 12:36 AM

tersejr
thanks for a job well done after reading this i did the job in about a half hour this should be in dirtwheels or one of those mags and you should get all of the credit for a great post with pics thanks for helping all of us you rock

**Duane** · 01-22-2007, 06:26 AM

Quote:

tersejr
thanks for a job well done after reading this i did the job in about a half hour this should be in dirtwheels or one of those mags and you should get all of the credit for a great post with pics thanks for helping all of us you rock

[/b]

w00ter dirtwheels.

crazy8's · 01-25-2007, 04:21 PM

hmmm i herd diffrent about the cam mod i herd it takes all your low end away and all you have is top end guess its good for mx but not good for trail rideing...also herd you have to smash the throtle to really feal a diffrence hmm confused over here...

**Duane** · 01-25-2007, 04:37 PM

Quote:

hmmm i herd diffrent about the cam mod i herd it takes all your low end away and all you have is top end guess its good for mx but not good for trail rideing...also herd you have to smash the throtle to really feal a diffrence hmm confused over here...
[/b]

Well, you HEARD wrong.

Best thing to do other then listen to rumors is to try it. The best thing about it is it isn't permanent and can be changed back. I hate scuttlebutt.

CooperS7777 · 01-25-2007, 04:58 PM

Im debating having the cam mod done in my 05. Its going in for service next weekend, to have the valves re-shimmed and the dealer said it wouldnt cost anything extra to do it.

Some people have claimed a loss of performance with this, is this year specific? Will it need to be re-jetted or no? Also, is the exhaust cam to be knocked back one tooth or foward one tooth - I assume foward since its being rotated one tooth clockwise but Im unsure.

Thanks for the help and a great informational post. Id do it on my own but its only 125 with parts from the dealer and Im not comfortable enough wiht the machine yet to do something like this myself...time is also an issue.

**Duane** · 01-25-2007, 05:05 PM

You rotate the exhaust cam clockwise one tooth looking at the cam sprocket side of the head.

Jetting change...maybe. Most people have to increase the pilot one size up.

I've had it on my 05 for more then a year. No loss of low end performance. It actually increases mid to upper performance and most think because there's no change in low end you're actually loosing performance..not the case.

Best free mod you can do IMO.

sandforme · 01-31-2007, 09:26 AM

I have 2 06 yfz40 and did the cam mod this past weekend...heading out this Friday to test. I have also heard from a handfull of people that say the cam mod will screw your engine up?? I have never actually talked to anyone that it has screw there motor up......It sounds like everyone here has good luck...I hope i made the right decission doing the cam mod!!

**Terse** · 01-31-2007, 10:01 AM

Quote:

I have 2 06 yfz40 and did the cam mod this past weekend...heading out this Friday to test. I have also heard from a handfull of people that say the cam mod will screw your engine up?? I have never actually talked to anyone that it has screw there motor up......It sounds like everyone here has good luck...I hope i made the right decission doing the cam mod!![/b]

The only way it would mess up the motor is if it were done incorrectly. If done correctly there will be no damage.

Enjoy

GERBALTRON · 02-03-2007, 08:15 PM

This is an awesome mod, no loss of power in the lower range, much more in the mid and upper. I love it. However make sure that someone who is capable of doing the mod does it for you, and NO, THE DEALER IS NOT ALWAYS CAPABLE. Trust me I speak from experience. I let one of the local Yami dealers do the mod after I purchased my 06 YFZ. It ran well, hard to start sometimes, but once running, she ran really well. Took her in for her first service this last week, got a call from the Service Manager telling me that they had found a problem. The tech that did my cam mod left out a ciri-clip, and had also over tightened the cam towers!!!! How does a tech do this?? I thought that they got all this training and stuff, and have the tech manuals to make sure that they do it right. So I got $2000 in new parts, it had destroyed both cams and cam towers, they ended up replacing almost everything in my engine due to metal flecks from the cams and towers being forced throughout the engine. Needless to say, I was not very happy. It took them a whole week to fix everything. At least my warranty covered everything, since it was their tech that screwed up. So this time I decided that I would do the mod myself, I have the tools and the know-how and of course access to this great topic. Guess what, I did it right. Runs great, just got done checking everything, pulled the top, no metal on metal contact. Changed the oil, no metal flecks!!! Success, sweet success!!

Thanks for the great topic! You all rock!

**Terse** · 02-03-2007, 11:04 PM

That is great to hear that you decided to do it, and we all here at YFZCentral are here to help.

NETHNGBTSTK · 02-07-2007, 01:16 PM

Quote:

That is great to hear that you decided to do it, and we all here at YFZCentral are here to help.

[/b]

Lets take a poll on how many people have done this mod and feel it was

A-Great, with no loss of low end power and much improved top end.

B-OK, can feel a little difference

C-Poor, loss of low end power with engine problems or other issues.

**Terse** · 02-07-2007, 11:21 PM

Quote:

Lets take a poll on how many people have done this mod and feel it was

A-Great, with no loss of low end power and much improved top end.

B-OK, can feel a little difference

C-Poor, loss of low end power with engine problems or other issues.[/b]

No. Too many people are opinionated without facts. You can not "prove" an opinion.

11-18-2006, 09:40 AM	#21 (permalink)
ugotbit Senior Member Join Date: Aug 2006 Location: Upstate N.Y., Saratoga Springs area... Posts: 1,196	Awsome post man. This has cleared up any concerns that I had about the cam mod. The pics, the step by step, its all great! __________________ 06 ARS FX/AXIS XC YFZ 450

12-24-2006, 07:33 PM	#25 (permalink)
greasemonkey Member Join Date: Oct 2006 Posts: 89	well ive read this thing a million times. i wanna do the cam mod sooo bad. but i dont have the courage to open up the 4-stroek up by myself. so i called my buddie his dads a mechanic( owns his own atv/ bike repair shop) and he does alot of race bikes and quads. he said he woudl help me do it. all its gunna cost me is to ge tmy bike down there and back and a case of beer( after the wheeler is done) __________________ Hi I'm Lance 2007 YFZ 450-HMF full system pipe, GYTR nerf bars, Tusk EZ-fuel screw. 2002 YZ 125- PC works pipe, R-304 Shorty, MOTO 814 Porting, boyesen rad vavle, renthal bars

01-09-2007, 08:18 PM	#28 (permalink)
yfzrider8 Member Join Date: Jan 2007 Posts: 39	thanks man, it is well written and you did a good job on it. __________________ 06 yfz450,yoshimura RS-7 pipe, K & N intake, pro taper bars, ac pro peg nerfs, ac bumper, maier scooped hood, cam mod, ASV pro perch levers, full flight +3 a-arms, durablue rear wheel spacers, houser +1 stem

01-25-2007, 04:58 PM	#33 (permalink)
CooperS7777 Member Join Date: Jan 2007 Posts: 82	Im debating having the cam mod done in my 05. Its going in for service next weekend, to have the valves re-shimmed and the dealer said it wouldnt cost anything extra to do it. Some people have claimed a loss of performance with this, is this year specific? Will it need to be re-jetted or no? Also, is the exhaust cam to be knocked back one tooth or foward one tooth - I assume foward since its being rotated one tooth clockwise but Im unsure. Thanks for the help and a great informational post. Id do it on my own but its only 125 with parts from the dealer and Im not comfortable enough wiht the machine yet to do something like this myself...time is also an issue. __________________ 05 YFZ 450 and a fleet of other done up toys.

01-25-2007, 05:05 PM	#34 (permalink)
Duane Senior Member Join Date: Dec 2004 Posts: 13,943	You rotate the exhaust cam clockwise one tooth looking at the cam sprocket side of the head. Jetting change...maybe. Most people have to increase the pilot one size up. I've had it on my 05 for more then a year. No loss of low end performance. It actually increases mid to upper performance and most think because there's no change in low end you're actually loosing performance..not the case. Best free mod you can do IMO. __________________ My photography website---->http://duanenoblick.zenfolio.com/ "Live as if you were to die tommorow. Learn as if you were to live forever." -Ghandi

11-19-2006, 01:54 PM	#24 (permalink)
Terse Bad Azz Admin Join Date: Aug 2005 Location: Colorado Springs, CO Posts: 10,127	richen up the pilot jet 1 size.

12-28-2006, 05:27 PM	#26 (permalink)
stuff105 Senior Member Join Date: Sep 2006 Location: CT Posts: 1,004	can this mod be done with a wr crank kit ?

01-22-2007, 12:36 AM	#29 (permalink)
Dano22 Junior Member Join Date: Jan 2007 Posts: 3	tersejr thanks for a job well done after reading this i did the job in about a half hour this should be in dirtwheels or one of those mags and you should get all of the credit for a great post with pics thanks for helping all of us you rock

01-25-2007, 04:21 PM	#31 (permalink)
crazy8's Senior Member Join Date: Oct 2006 Location: long island new york Posts: 210	hmmm i herd diffrent about the cam mod i herd it takes all your low end away and all you have is top end guess its good for mx but not good for trail rideing...also herd you have to smash the throtle to really feal a diffrence hmm confused over here...

01-31-2007, 09:26 AM	#35 (permalink)
sandforme Junior Member Join Date: Jan 2007 Posts: 4	I have 2 06 yfz40 and did the cam mod this past weekend...heading out this Friday to test. I have also heard from a handfull of people that say the cam mod will screw your engine up?? I have never actually talked to anyone that it has screw there motor up......It sounds like everyone here has good luck...I hope i made the right decission doing the cam mod!!

02-03-2007, 08:15 PM	#37 (permalink)
GERBALTRON Junior Member Join Date: Jan 2007 Location: Kingman, Arizona Posts: 12	This is an awesome mod, no loss of power in the lower range, much more in the mid and upper. I love it. However make sure that someone who is capable of doing the mod does it for you, and NO, THE DEALER IS NOT ALWAYS CAPABLE. Trust me I speak from experience. I let one of the local Yami dealers do the mod after I purchased my 06 YFZ. It ran well, hard to start sometimes, but once running, she ran really well. Took her in for her first service this last week, got a call from the Service Manager telling me that they had found a problem. The tech that did my cam mod left out a ciri-clip, and had also over tightened the cam towers!!!! How does a tech do this?? I thought that they got all this training and stuff, and have the tech manuals to make sure that they do it right. So I got $2000 in new parts, it had destroyed both cams and cam towers, they ended up replacing almost everything in my engine due to metal flecks from the cams and towers being forced throughout the engine. Needless to say, I was not very happy. It took them a whole week to fix everything. At least my warranty covered everything, since it was their tech that screwed up. So this time I decided that I would do the mod myself, I have the tools and the know-how and of course access to this great topic. Guess what, I did it right. Runs great, just got done checking everything, pulled the top, no metal on metal contact. Changed the oil, no metal flecks!!! Success, sweet success!! Thanks for the great topic! You all rock! __________________ 06 YFZ-450 Special Edition HMF Sport S/O, Cam Mod, K&N Powerlid & Air Filter, GYTR Jet Kit, GYTR Fuel Screw.

02-03-2007, 11:04 PM	#38 (permalink)
Terse Bad Azz Admin Join Date: Aug 2005 Location: Colorado Springs, CO Posts: 10,127	That is great to hear that you decided to do it, and we all here at YFZCentral are here to help.

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