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MXR176

2003-05 YZF 450 Exhaust Cam Q?

19 posts in this topic

HAs anyone tried the 2003-05 Cam in the 2009? The last Yamaha 450 I owned was the 2003. It came off the bottom and pulled good all the through the RPM. I had the motor done on that and full exhaust etc etc. I then went to Honda 's from 05-08 and had motors everything on them and those motors were awesome I mean unbelievable. I then had an offer to go back to the Yamaha shop that I used to ride for. I just went and picked up a 2009 and have already had the motor done, exhaust, U4.2, HC piston, ENZO suspension etc etc. I love the smooth power but its lacking the bottom to mid that the honda's had and the bottom through top that the 03 had. Opinions appreciated. :thumbsup:

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Why does that surprise you?

What surprise me? Im trying to see if anyone has ran or tried the 03-06 cam in the 08 or 09 and what they thought of it. Did it boost the bottom back up?

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What surprise me? Im trying to see if anyone has ran or tried the 03-06 cam in the 08 or 09 and what they thought of it. Did it boost the bottom back up?

From what I understand, the bottom end pull on the 03-04 had more to do with ignition timing than anything else. Maybe you should try a variable ignition box. I forget who makes it (I'm sure someone will chime in), but it has like 10 different settings.

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HAs anyone tried the 2003-05 Cam in the 2009? The last Yamaha 450 I owned was the 2003. It came off the bottom and pulled good all the through the RPM. I had the motor done on that and full exhaust etc etc. I then went to Honda 's from 05-08 and had motors everything on them and those motors were awesome I mean unbelievable. I then had an offer to go back to the Yamaha shop that I used to ride for. I just went and picked up a 2009 and have already had the motor done, exhaust, U4.2, HC piston, ENZO suspension etc etc. I love the smooth power but its lacking the bottom to mid that the honda's had and the bottom through top that the 03 had. Opinions appreciated. :thumbsup:

What do you mean by had the motors done? Done what. I have a set of cams from a 04 that I might try in my 07 if I get a chance. I will report back when I get around to it.

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Vortex has one. There are others.

The recommended fix for this if a good exhaust won't do it is the '06 exhaust cam (5TA-12180-10-00), not the '03-05 (5TA-12180-00-00). Using the 5TA--00 may work, but might cut off too much top end.

Even with the restrictive stock exhaust, the '09 has 4 hp more than the '03 at the power peak. Virtually any decent exhaust adds 5 or more hp at the 5000 rpm zone of the middle range and wakes the bike right up. Absent the pipe, you'd gain some from the earlier cam, but not as much as with it.

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What do you mean by had the motors done? Done what. I have a set of cams from a 04 that I might try in my 07 if I get a chance. I will report back when I get around to it.

Ported polisted flowed, cams, ignition, carb work, HC piston, lightened crank, big valved head etc etc.

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The cams in all the 03 to present yz450 are very much the same as far as the lift and duration. what is not the same on these motors is the cam timing ( the position the sprockets are pressed on) in common terms this would be the lobe centers. The new motors have these numbers on the order of 5 degrees different on the exhaust and 7 on the intake. The cams can be retimed but this takes a fair amount of skill and knowledge. If you want a hit more like the early bikes and the top end change both cams just the exhaust won't do the job.

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If you want a hit more like the early bikes and the top end change both cams just the exhaust won't do the job.

If you change both the intake and the exhaust you will increase the low end at the expense of the top. Regardless of what you may think, remember, imagine, or believe, the '03 and '04 models do not have the same high rpm power or rev past 9500 rpm with the same verve that the '06 does, much less the '07 or later models.

Changing out the exhaust cam alone has been tried, and does work. In fact, the only difference between the '03-'05 YZF and the '03-'06 WR450 was the exhaust cam; the intakes are the the same. That's a little bit of an indirect reference, but it's an example of the fact that the lobe centering of the two cams need not be kept in sync with each other.

The thing that clouds the issue here is that the OP now informs us the bike has had engine mods including "cams". The brand, grind and timing are unknown, so in this case, the question of what to do is much more open than with a stock '08-'09. A pair of '06 cams might be the best approach.

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I agree that the cam lobe centers are not related as such. I have a drawer full of stock cams from all the yfz and yz models ( I love E-BAY) and except for the lobe centers they are the same. I have changed the stock timing on 4 08 motors and the difference on a supermoto track is night and day. I would bet though that on a slippery MX track the lap times would be slower.

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I have changed the stock timing on 4 08 motors and the difference on a supermoto track is night and day. I would bet though that on a slippery MX track the lap times would be slower.
You are probably correct about the disadvantage of too much grunt. It's often more thrilling than useful. I recall that each year YZF beginning with the '06 was criticized for having too little low end power in the shootouts, and yet the YZF was frequently the bike that turned in the lowest lap times. I guess no one saw the connection.

What you should try, if you have not, is a cam set with offset lobe centers, i.e., an '06 exhaust with an '07 or '08 intake. Could be the ticket.

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Ok thanks for the info! The 07, 08, and 09 all have the same intake cam if Im not mistaken right? So what I need is a 06 Exhaust cam then right?

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The 07, 08, and 09 all have the same intake cam if Im not mistaken right?
Nope. The intake cams are different in each of the '03-'05, '06, '07, and '08-'09 models, each timed with progressively more bias to high end power over low end.

As to what you need, I don't think any of us can say that without knowing which cams are in your bike now.

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Nope. The intake cams are different in each of the '03-'05, '06, '07, and '08-'09 models, each timed with progressively more bias to high end power over low end.

As to what you need, I don't think any of us can say that without knowing which cams are in your bike now.

My bad I thought I posted I still had the stock 09 cams in it. My bad for leaving out that info. Hope that helps now. :thumbsup:

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My bad I thought I posted I still had the stock 09 cams in it. My bad for leaving out that info. Hope that helps now. :thumbsup:

Quite the opposite. You posted:

Ported polisted flowed, cams, ignition, carb work, HC piston, lightened crank, big valved head etc etc.

If you have the '09 cams, then start with the '06 exhaust cam. I assume you have an aftermarket pipe already?

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Quite the opposite. You posted:

If you have the '09 cams, then start with the '06 exhaust cam. I assume you have an aftermarket pipe already?

Ok let me clarify everything. My 2009 YZF 450 has the head ported polished and flowed, Full Yosh Ti exhaust, stock cams and piston. The motors that I was talking about that had the full works with the igniton, cam, lightened crank etc etc. Were my honda 's and my 2003 Yamah 450.

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