A few of the local XT guys have approached me to build them a powerful XT motor.

Not sure when this will happen and if they will go through with it, but let's see.

The biggest problem is that these guys are hundreds of miles away from me and getting the bikes to me is costly.

With the initial Xt's I want to try a few different things and for that I need a running bike.

In the next week or so, I will be doing a few raptor heads and I will take pictures of the process and post before and after results.

Can you post the torque & hp readings, even though the Raptor displays quite a different torque & hp curvers on the dyno.

We would be able to see the difference in the gain. My kind of tuning a before & after runs on the same dyno.

Ok, want to see a stock raptor versus my latest one on the same printout?

Wow, I read this whole F'n post. Amazing. I was wondering about the XT motor and the Raptor motor, difference wise. This about sums it up. Only 43 hp on a stocker? That's seems pretty weak. KTM's new 690 claims 60 hp stock. I don't know if I believe this or not.

Anyway, this is why I read the internet forums because of the guys out there who are willing to share their own experiences in modding bikes. Stealers just want you to hand them a ton of cash and do little or no work for you. Real results here and no B.S.

AMAZING WORK.
:kneel:

Thanks mate, thats 57HP at the rear wheel.

I could have done more to the motor but being my first 660 big bore I was taking it moderately, it was a learning curve for everyone. We now know we can get even more HP but have to watch the torque doesn't reduce to much low down.:icon_scoot[1]:

Thanks to Kev
 

Thanks Kev for sharing it all with us. Very very interesting.
I got a lot of pleasure following your different stages of build and modification.
You are what this forum is all about and Capt. owes you a drink or two!..
(Has you colleague got a machine in his workshop to pry apart wallets?)
:smile[2]:

You can say that again TT, Kev is really what this forum is all about. In fact without Kev, there rest of us would just be amateurs with a passion for bikes (the xt ones in this case) and (personally speaking) --->> very little knowledge, however we must not forget that there are other people like Freez that have similar knowledge and skills, and we also have a lot of people that each help individually with their different mods, such as the crash bungs, the belly pans, the tail end mods and more.

Oh and as for me owing Kev a drink, that is also true, but if you were to read all the forum threads from the beginning you will know that I have somewhat contributed to those drinks, but even then, there are not enough "drinks" in this world to repay his dedication and support. Kev just loves to help out of his own kindness.

Thanks for your kind words guys. I love helping others who have the same passion as me, bikes & have always moded every bike I have owned. So all I am doing is sharing my finding with others.

Yes my good friend Kev2 know as KLR on the forum specializes in making laser atomic equipment for scientists. So getting something made or machined usually costs a few beers, or to work on his bikes.

velocidade
 

Hello Kev, I am in Brazil, already did a job that with a XT600E, increase the piston from 95mm to 101mm, I used a Wiseco, was very good, now I have a XT660 and looking at his work, I'm thinking of something similar. to have a Wiseco piston 103mm, that will reach 700cc, or probably use the same cylinder that you used, and decreases the diameter of the cylinder projection for him to enter the engine block. We have not decided what to do, it will be much more difficult because the bike has electronic injection, the other was carburetor. I do not have many resources, require tools that bike is difficult because electronics.
You've already picked up strong in 5th gear to see how much speed until it arrives?
The other that I did, I used a crown of 43 teeth and relieved to spin the engine while maintaining a good torque. I do not know what power it has achieved. She came to 150 km and started to reach 165km under the same conditions. I did nothing in the carburetor, there was no difference in consumption when used in jacobina normal. Consumption of 20km/litro gasolina.Haver� words you do not understand, because I can not speak English, I am translating in Google.Ficou very good at his bike, congratulations. Good luck to you.

Fred.

Hello Fred welcome to the XT forum.

1/ 6mm bigger piston would give nice gain in torque.

2/ 182kph on the speedo.

3/ You needed to change the needle positions & main jets & your XT would have gone much better with the big bore & run cooler.