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- - XT660 to 700ccm conversion ( https://www.xt660.com/showthread.php?t=7810)

Quote:

Originally Posted by marjani (Post 68077)

Hello guys,

Shortly I'm doing a 660 to 700cc conversion. Here's so far what I've done.

1. bought a used XT660 head + cylinder + cam (oem)
2. bored and coated (nicasil+?) the cylinder to 700 ccm; done by http://www.powerseal.nl; they use a special process. See pics IMG_0869.jpg IMG_0870.jpg IMG_0874.jpg
IMG_0875.jpg
3. bought a suitable 103mm JE piston (thanks Kev for the advice!); See pics IMG_0876.jpg IMG_0877.jpg IMG_0878.jpg IMG_0880.jpg IMG_0881.jpg
4. tuned the cylinderhead + paint job (done by http://www.off-the-road.de; see pics before (head already sand blasted) - (IMG_0940.jpg IMG_0944.jpg IMG_0945.jpg IMG_0946.jpg IMG_0947.jpg IMG_0948.jpg IMG_0949.jpg) and after head tune job and coating job (IMG_1198.jpg IMG_1199.jpg IMG_1201.jpg IMG_1202.jpg IMG_1203.jpg).

Next steps:
- coating the cylinder to black
- still waiting for the OTR cam; will arrive shortly.
- remove the engine

Will keep you informed!

Greetings from Holland,

Marcel (marjani)

How many extra horse power will you have at the end in total?

:eusa_shifty:

just 68HP and 77Nm torque

To get more then that you will need a bigger cam, big valve head, stage 3 air box, higher compression piston ratio & a stroker crank then you will see the late 70hp mark as proven in the Raptors.

There are a few builds on the go at the moment so we hope to get the first XT over 70HP soon.

Quote:

Originally Posted by Kev (Post 119727)

Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / PCIII With Custom Dynoed Fuel Map / LCD Dyno Jet display & fuel adjuster / Carbon Can Exhaust / Modified Exhaust Link Pipes / Extra Coolant Cooler / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Protaper Fat Bars / Tail Tidy With LED Tail Light / Worry Brothers stage 2 filter cover / OKE Protection Knobs / LED indicators / 35mm Fork Spacers / 15Weight Fork Oil / AIS blocked / 6mm & 8mm Bolts Replaced with Titanium Bolts / Modified rear sprocket rubbers / Rear Foot Pegs removed / 07 ECU With 02 Sensor Changed To A 05 ECU / Complete wiring harnes Changed from 07 to 05 / O2 Eliminator/ Recovered seat in Black / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Now fitted with a DNA stage 3 Air Box / Modified Bar End Weights/
What you as a signature written Wooowww real?

Quote:

Originally Posted by aseker (Post 119749)

It sure is real, each stage of my mods have been documented on this forum for everyone to see.

I am looking into a Big Bore project, has anyone in the UK done one?

Initially, I am looking into costs/what I need, and also any feedback. i.e. does the bike vibrate alot more? Any downsides to the conversion?

It does not vibrate much more, you can get the crank & piston balanced for around US$150 if you are worried about it.

There are only a hand full of riders in the world that have done a XT660 big bore, so don't expect a big responce. You should have bought my big bore kit that I sold in June, a 102mm Raptor cylinder & XT660 ported head for 250 pounds.

�250...don't!! i didn't have the XT then, but would have bought it!

There was a dealer selling a head & cylinder for a XT660 on Spain I will see if I can find them again, they wanted 250 pounds for them. They have a used XT660 crank for me, but wanted to much for it so I gave them the flick.

A Standard head/cylinder Kev? Thank you.

Kev, I don't want to lose the lovely "drivability", so would you recommend a 700cc /?

I am just after a small gain through 3000-6000 revs .....I don't want to go too extreme! (gets expensive and more "racy"!)