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.: XT660.com - The #1 XT660 Resource :. ( https://www.xt660.com/index.php)
-   XT660X & XT660R General Discussions ( https://www.xt660.com/forumdisplay.php?f=121)
-   -   Big Bore and Gas Flowed Head Project ( https://www.xt660.com/showthread.php?t=14763)

Paul Curtis 29-08-10 11:03
This might be a daft question or been covered on a different thread but will the raptor engine fit in the xt as one lump so no need to mod one out one in??

Kev 29-08-10 11:09
The Raptor bottom end is completely different to the XT, also the gear ratios are not even close to each other.

richardsracingmad 29-08-10 11:19
Or you could just go and buy a Husky 450/570....
..... �12000 ish gulp!

Kev 29-08-10 12:02
I would have to modify that as well, 12G + moding.

When I think back I have just about modified every bike I have ever owned in some way, I am on number 43.

richardsracingmad 29-08-10 12:52
if only i hadn't sold my Ducati 250 mk111.........i loved it!!

and, i couldn't sell it for �500.....everyone wanted an RD ....sold for �275.

It makes me cry.........i needed the money.

Similar bike today �7000 ish.

richardsracingmad 31-08-10 07:32
Quote:
Originally Posted by Kev (Post 137095)
You can't use standard valve springs with the 5050 cam the rockers also need to be radiused so the lobs can clear the rockers.

I posted the dyno runs as a compassion between the 3 cams.

5050 cam
Stage 3 Hot Cam
X4 cam

You used the Raptor decompressioner & cam sprocket, the XT's cam chain is fine.

Personally 7500 rpm would be the highest I would set the rev limiter on a XT motor.

Bigger the bore, more torque, more vibration. The motor behaves very twitchy in low revs on light throttle openings.
After my first trail ride, having a motor that is twitchy in light throttle openings is going to make things difficult for me when offroad.

Kev 31-08-10 11:41
That is why you need to build a motor that can produce the bepower across the whole rev range, not in the mid range only where you want it.

richardsracingmad 31-08-10 21:44
Reverse Megaphone Exhaust
 
Freez mentioned it earlier in this thread.

I have had a chat with an engine builder, who also approves of them.

WHAT DO YA THINK GUYS, THEY LOOK DEAD SEXY TOO!
(the pipe before the silencer, and yes, I know its not an XT! Just for illustration purposes, ok?)
http://i933.photobucket.com/albums/a...g?t=1283283026

Notice how the diameter of the link pipe "cones"

Kev 31-08-10 23:21
Notice how the diameter of the link pipe "cones"[/quote]


If you have a close look at my link pipes from any of my photo's they are also coned, I had them specially made for my Carbon Cans back in 2006. They tapper from 34mm to 50mm ID.

richardsracingmad 31-08-10 23:23
Estimated Cost of my (ever-growing) Conversion

So far!!...

Spare Barrel �60
Rebore/plating �130
Piston Kit �115
Top Gasket �37
Bottom Gasket �10
Oil/sundries �20

+3 throttle body �130
Webb springs/ret and HDD5050 Cam �290
+2 Valves �50
2x Exhaust valves �50
Valve guides �58
Shipping UK-US-UK �35

Head flow/port �275 Plus
Rebuild/strip �220

Then, undecided so far....

Try a special profle cam

Rev. meg Exhaust �600


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