Hi there KLR and welcome to :660: good job on Kev's bike, we've seen the pics and we were all very impressed.

Enjoy your time here

Thanks Fran ,it is hard trying to keep up with Kev, he has to many ideas in his head. When are you coming to Oz for a ride?

Damn you KEV!!!!!....lol

You and your mods got me in a mood to mess around with my XT also.

I have 2 700R raptors with me now and I am testing out bigger valves, different valve seat cuts and also new high flow valves. Once I am done with these two raptors I will have more detail on how to get the Xt's head to flow a lot better.

You need to get your bike on the dyno to see how much it cranks out now and then I will see if I can catch up to the same power, but going towards stage 2 cam, porting the head, but not increase the XT's capacity. Not sure I will be able to catch up to the 700�s torque output, but worth a go.

Hopefully when we are done, we can give these guys two options to make the XT's go.

If it wasn't for my leg we would have had the results long ago.

I will get a stage 2 cam to try once I have the results from the big bore stage 1 conversion. They very cheap to buy once you have all the extra bits from the Raptor cam.

The big bore with stage 1 cam will have more torque, than just flowing the head & a stage 2 cam. The stage 2 & head port with valves should have more HP, I recon.

I am looking into the Raptor stroker kits & waiting for my local dealer to pull down a Raptor motor, so I can do some measurements.

We both know these motors respond well to more air/fuel & the Raptor forums have proved this. Getting more air/fuel in & out = more HP on these motors.

Well, if things work out as planned, I might have a XT700 on my dyno soon.

One of the Yamaha dealers I spoke to today built a XT700 for a client, but they bored out the stock XT sleeve to 102mm, installed the raptor 11:1 piston and gasflowed the head. As far as I could tell, it is still running a stock XT cam

If their claims pan out, it looks like it makes around 5HP more than a stock XT660X with DNA stage 2, PCIII and Leo Vince Slip-on pipes. But let's wait and see what it make on my own dyno, before we get to excited.

Currently it is running a TFI which we all know does not do a good job of fueling the XT and I gave them a Dynatek EFI unit to try out and see if it makes better power.

I�m eager to see how Kev�s machine will perform on dyno.I�m waiting for my stg 1 and the raptor bits to arrive here in Brazil, if my bike had an improvement with this cam at high rpm�s I will be satisfied,I think the 660 engine is too calm at high rpm�s.My bike is running with Kev mod, both filters and leo vince pipes, my spark plug looks great so I dont think I will have much problems with the fuel mixture after installing the cam.Imagine the Kev XT with the same power as the new KTM 690 ,this will be awesome.:woo::woo:

If you are starting tp play with big mods like cams & pistons you need a Power commander to get the fuelling right.

Boy the mods are starting to roll in. When are you getting this bike on your Dyno?

Well the results are out, I am still testing camshafts over the next few days, so more dyno sheets to come.

Just short of 57HP, 56.92 @ 6500RPM. I have lost a bit of the bottom end but gained alot on the top.




http://i201.photobucket.com/albums/a...ltersPipes.jpg


http://i201.photobucket.com/albums/a...tx/7200RPM.jpg


http://i201.photobucket.com/albums/a...evxtx/2-17.jpg


http://i201.photobucket.com/albums/a...ore7200RPM.jpg

Looks like a reasonable gain there, the question is are you happy with it?