First Generation Ascots > Classified Ads

WANTED: FT500 Cylinder Head

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Swatdoc:
Yes they will interchange, you are correct. I'm building an XR500 for motocross using a C&J frame.

Like in the attached pic

My motor builder suggests using an FT head due to the heavier duty studs/bolts, and the overall design.

scottly:
The '82 XR head had a rectangular intake mounting, with a reed valve. White Bros sold a "reed valve eliminator", which smoothed the entry to the valves. The FT, and possibly the XL, had a round intake. The overall design is the same. I don't know about heavier duty studs and bolts.
 

J6G1Z:
That is one Bitchin Moto-X bike!

It looks almost too pretty to take out in the dirt. I like that reverse megaphone tail-pipe.

J.

Swatdoc:
Pretty much every high performance motor builder I have heard of recommends the regular intake and not the reed intake.
Currently I have an 81/82 lower end with a 80 head ( all XR ) that I'll be using unless I can find an Ascott head.
Supposedly the Ascott gears are a little more beefy too and fit fit right into XR cases.
My motor builder is also going to attempt to adapt and install an Ascott ignition into my motor. Electronic advance verses mechanical and much higher voltage output

scottly:

--- Quote from: Swatdoc on December 16, 2014, 02:24:09 pm ---
My motor builder is also going to attempt to adapt and install an Ascott ignition into my motor. Electronic advance verses mechanical and much higher voltage output

--- End quote ---
I've never seen a mechanical advance on any version of these bikes? Does the 80 head have the same rectangular intake with the reed valve as the 82? As far as the trans gears go, I've never heard of any failures with the XR parts.

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