Yes I have, as you know I have one for sale, AUD$70 + postage cost..

XT660 & Raptor 686 cams have totaly different profiles.

I've now joined a Raptor forum too! Very informative, just spent a couple of hours on the Raptor 700 modifications, its chocka with info.

(Save bending eveyones ears......!!! lol)

They are absolutely bonkers these guys, all of 'em! You should see what engine mods they do....really impressive stuff.

I have been nudged in the direction of having a look at the Fiftyfifty cam....................
It has bags of low down torque, and a quite alot of power, ....hmmmmm

hmmmmmmm

This could change things...but I have alot to look at, so keep you posted.....

Oh,.. and how does my new Supporters badge look? Like the colour?

Why couldn't yamaha just do all these mods to the bikes in the first place...

imagine, buying a brand new XTX with these mods already done out of the box.

Just think of how big you're smile would be and a massively happy customer!

Well Daz, it's just mind boggling with all these mods on the Raptor forums.

But, these are racing engines....

And I want to build a nice road/greenlaner bike....theres a big difference!
(note: I am not talking about brakes, suspension, how well I ride, getting the most out of your bike,etc...... just tuning the engine).


Big bore. Yes
Head port and valves. Yes
Throttle body. Ok, if that will help the above, yes
Rally/race camshaft. errrrr, would I like that? I don't know.

The only way to know is to try it. Like you say Daz, I wish I could test drive a bike with one or two of these camshafts in. Every camshaft I have looked at seem very "spikey" , certainly on paper, compared to our lovely standard one.
And the standard one is so nice and driveable and smooth and easy. A camshaft can radically change an engine, especially when doing the above-mentioned mods. EDIT: (I really like the standard camshaft, don't I ? )

And also add-in the factor of (un) reliability.
As my bike is at the moment, it will be no less reliable than a standard bike. (Stage 3 DNA Airbox, Cans, PC111)

Adding a big bore/ higher compression /(ported big-valve head) will compromise reliability and engine life for extra power. And it will be thirstier. Ok , I can go with that. I like big bores.

Adding a rally/race cam will also add-in less reliabilty, and more engine wear. And what about the strength of the gearbox, Clutch, Cam chain, cam gear, camshaft, big-end bearings, con-rod, the uprated valve gear, small end bearings, oil pump, etc.? ...Not sure about that.

So, all these factors really come down to each individual engine build. We have two really helpful and knowledgeable techie-tuners on the Forum, Kev and Freez, (and thank you guys for your input again), but as I say, it all comes down to each individuals wants/needs/budget/, and the trade-off of more power/torque- against - reliability/engine wear.

My list if I do it again.

5050 Raptor cam.
+2mm Inlet valves, get them from Freez or http://www.whiteknuckleracing.com/index1.html
Valve springs & retainers, http://www.whiteknuckleracing.com/index1.html
Ported Head
102mm CP 11.5:1 piston kit.
Re-deck the cylinder.
Stroker crank + 5mm, cost is high to make one ?
+3mm throttle body
Dynojet ignition.
PCV or PCIII
DNA stage 3 airbox
Carbon Cans exhausts.
There you have a + 70HP motor which will pull from low down all the way up.

Below was the build of a Raptor 700, the dyno runs done were with 3 differrent Cams on the same bike on the same Dyno for back to back testing.
11:1 piston, stock valve head, dynatek ignition, pc3, +2 tb, FCI

As you can see the 5050 cam in Green has the best torque & HP by far.

http://i23.photobucket.com/albums/b3...cks/002-20.jpg

Very good post Kev!

(Finished editing this post!!)

It is a fab cam Kev........fab......fab.......!!! I like it!!!!
I looked at this yesterday, and was thinking...IF I go this far (the cam adds alot to budget and complexity)...I would be happier taking it to a better engine builder than myself ! Access to machinery etc...valve pockets may need careful checking etc. .

What were the other runs?...looks like same cam.....?

Didn't the standard valves bounce around like mad? i bet they were doing a Salsa!! i think a spring kit like WKR does is good!

Did you do any bottom end heat treatment, balancing or anything else?

How long or how many k's did you travel with this set up?

Revving the engine that high for "dyno showing" is fine....but by how much, or where, even with upgraded valve gear, would you set the rev limiter?(personally, I won't hold you to anything/liability etc.) about 7500-8000rpm looks sensible, and errs on the "more safe" side.......

Would you recommend a stronger cam gear/chain/.. wouldn't it be great if you could have the cam gear-driven....??

Taking an educated guess...with a plus 3mm piston/bore, do you think that would behave itself? Or is it TOTALLY bonkers? I think I would have to keep the CR sensible and not extreme....11:1-11.5:1 true.

How, or in what way, do you think a big bore would effect the power curve/torque curve? It would make the engine a little tad slower right?

How strong are our wheel spokes???????? and gearboxes??????? lol

You can't use standard valve springs with the 5050 cam the rockers also need to be radiused so the lobs can clear the rockers.

I posted the dyno runs as a compassion between the 3 cams.

5050 cam
Stage 3 Hot Cam
X4 cam

You used the Raptor decompressioner & cam sprocket, the XT's cam chain is fine.

Personally 7500 rpm would be the highest I would set the rev limiter on a XT motor.

Bigger the bore, more torque, more vibration. The motor behaves very twitchy in low revs on light throttle openings.

I'm guessing..that with a the Big bore..

Torque will be similar to what I have now (v.good), up to 5000rpm. But I will be gaining more torque 5000-7000rpm..... so far so good...in fact brill!

Power is good, you have more up top to help push the bike through the air..
It looks like up to 4500 again, very similar to what I have now (v.good).

But that is on paper, as Kev says, twitchy on light throttle...

Eh...this is great!

I'd better get my entry in for the Rakkau Hillclimb!

It's all about money the more you poor in the more HP you get out.

Guessing, with all the parts, machining, and getting a engine builder to do it, fine tuning.... �?