my cylinder head is ready!! yipeee..all repaired too...it was quite nastily damaged...

Steve has helped me choose a compression ratio for the engine, so a CP 11:1 105.5mm piston will be the heart of the engine.

Just waiting for that and the liner....then its time for Steve to build it.

Nice the project is going on!I have my xt to fit an upside down wp front fork and a fully adjustable wp back shock to have the best driving experience when i finish the motor.Why did you choose the 11:1 compression?especially with HDD camshaft which works best with 12,5:1 compression

We chose 11:1 compression because it is still a road bike, and we want as much reliability as we can. Also, we were not sure how long the starter motors would last at any higher compression.
I believe the HDD5050 cam works very well at 11:1 as well....so I am happy with our choice.

Sounds like you will have an awesome bike, Steve, when it is finished. :headbang:

Nice work.

What is happening with the stroker crank?

No idea...!! Hopefully Dan will have some news...

I have decided to start a MUCH SHORTER thread about this engine mod under Performance Modifications (cos I do like to waffle on -don't I?), to make it easier for others to read. However, I will continue this thread...and the waffle.......

Right, one of the important bits.. COSTS !

So far, these are the costs, (although Dan has done me a great "Development Deal",) but I am listing the normal prices...


I have started with a spare engine (optional).

1 x Pair +1mm Inlet Valves $70
1 x Pair +1mm Exhaust Valves $70
1 x Set of Springs $180
1 x Cuervo Racing Ported Flowed Head $850
1 x Used Raptor cam gear $50
1 x Rocker Arm Clearance Machining $50
1 x HDD 5050 Camshaft $300
1 x Gasket 105.5mm $50
1 x CP 105.5 11:1 Piston $260
1 x Liner (Supply only) for cylinder bore $110
1 x Valve guides $90
1 x Throttle Body boring $200
1 x Shipping both ways $100

TOTAL PARTS/MACHINING FROM HDD $2380 (Approx �1480)

I didn't have valve guides , but added them anyway.

$110.00 for fitting & machining the 105 cylinder, bargain price.

What have they quoted you to build the motor?

You need to keep your engine mods on one thread otherwise no one will know what's is going on down the line.

$110 is not for fitting...its just to buy a liner. I have edited above to "supply liner only"

I have started the other, much shorter thread Kev, let me know if I have missed anything..... http://www.xt660.com/showthread.php?t=15459

That's not a bad price considering everything thats getting done. Be sure to keep an eye on the little bits and bobs that soon mount up.

Lookin foreward to the results.

yep...you will have a total cost at the end........