Thanks Kev, looks like you have beaten the KTM 690 SM on torque:

Performance (homologated) 46,8 kW / 7500 rpm Max. torque 65 Nm / 6500 rpmpls let me know what conversion factor to use for convertion to Nm. Sorry, I can't seem to find this factor on the WWW.

thanks.
marcel

Hey Kev,

If you got enough interest and pre-paid commitment - would you consider putting together a handfull of 'kits'? (i.e. all the bits required + modified barrels etc).

It takes allot of time & effort to get these parts together for a good price, it took me over 4 weeks to get everything as a complete kit. Then you need to machine the cylinder.

I have disclosed all the details where to buy them & what to do, http://www.xt660.com/showpost.php?p=51632&postcount=59
Mine is a once off & other riders would have to sort out their own parts & machining.

If you can find a 660 cylinder, ask Fran (CaptMoto) he might sell his now, he has 2 of them, get it bored & replated, you then do not need to do any machining to the cylinder, a very easy installation. I could not find a 660 cylinder that's why I went for the Raptor cylinder. Just weigh up the cost of buying a second hand cylinder with rebore & replate against a new Raptor cylinder from the states.

Congratulations mate, very good results,would be a good idea to post your new PC3 map for those who wants to go on this direction.Do you thing all these mods without the piston conversion there is a possibility to get closer to 54,55 hp.

I will be able to tell you later today, I have swopped over the XTX cam & running it on the Dyno in an hours time. This will tell me what the gain is with the big bore & calculate the stage 1 cam HP if it was done by it's self.

Final results for the XT660X to Raptor + Stage 1 Hot Cam conversion.

http://i201.photobucket.com/albums/a...alresults1.jpg

A before & after dyno run with just the Raptor 700 Cylinder 102mm & 11:1 piston kit.

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

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

The difference between a Stage 1 Hot Cam & a XT660X with the big bore kit.

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

http://i201.photobucket.com/albums/a...HotcamXTX1.jpg

As you can see from the results, the Raptor big bore kit offers a big gain in torque & HP over the standard XT660. Add a stge 1 Hot Cam & you have great mid to top end power, but with a loss in HP & torque low down.

As I have said before big HP does not mean the motor will be good across the whole RPM range, you need to decide how you ride & where you want the HP & torque.

If you ride 80% of the time below 5500RPM then the big bore is the way to go 3 more HP at peak, 3.82 HP mid range with a big gain in torque, if you ride on the stopper all the time the Stage 1 & big bore is for you with just around 57HP at peak.

If you are going to fit just a Stage 1 Hot Cam, you would be looking at around 4.63 HP gain at peak power. But with a loss of 3.98 HP & torque below 5500RPM.

Thanks Kev, what will be your next step? Are you going to try other cams (stage2/3)?

Looking at how much torque you loose low down with a stage 1 cam I am not going to bother trying a stage 2 Hot Cam now, if you want to race your XT then the stage 2 is for you, but not for me. I just want to see if I can get the stage 1 cam to work better low down & will try a few things with it.

I am testing the PVC valve mod at the moment & then working on a cooling mod soon, waiting on some parts to come in.

I want to find a second hand XT660 throttle body & bore it out by 2mm & renew the butter fly, the Raptor boys have shown some gains around 2 HP.

Kev I think I have a spare throttle body from Loz's first engine, as soon as I am fit to use both hands, I'll have a look in my shed and let you know, but I am positive that it was there amongst the spare parts.

Will let you know. Cheers
Fran

oh and I also think I might have a spare soolant hose from the reservoire to the engine which you asked Fosters last week.

what can I say, fingers crossed (should be my motto now :p) :120::merror::088:

Thanks Fran no rush at all one day when your hand feels better, let me know how much you want for it.

I have already bought a hose from Foster Monster today, he will post it off soon for me.