Author Topic: Cool old school ported cylinders (Read 9961 times)

mrtwidster1 · « **Reply #15 on:** December 16, 2014, 10:48:21 AM »

Quote from: MANIAK;47441

My favorite cylinder of all time was my ATAC CR250 cylinder. I believe it came from like an 84 or 85 CR250, it was a non powervalve cyl. much like a modern pro-x or ESR

Kinda like this one??

etccb · « **Reply #16 on:** December 16, 2014, 11:19:50 AM »

I had an 85 CR cyl back in the day as well. And later an 89 with the pv plug setup. The cr heads when/if used back then had 2 spigots and a Y connector in the hose setup after going around the spark plug cap.

udontknowme · « **Reply #17 on:** December 17, 2014, 12:13:55 AM »

first and last polish engine i ever had. wasnt really sad to see it go either :biggrin-new:

broken1 · « **Reply #18 on:** December 17, 2014, 06:03:33 PM »

Got this JD cylinder in a parts lot awhile back. Some of you guys might remember Jim Duncan. He had some of fastest bikes on the west coast back in the late 80's early 90's. There was an article in dirt wheels about him around 92 I think. I'll try to find it & scan it:

Also have a PT national cylinder that was done in 1990. Unfortunalely both intake bridges were ground down real thin & cracked:

& 2 pro-x LRD cylinders, 72mm & 68.25mm PV

MANIAK · « **Reply #19 on:** December 17, 2014, 11:27:46 PM »

mrtwidster1............ Yep, exactly like that one only not as shiny. Those cylinders were cool back in the day and really hard to find now.

etccb.......... I still have one of my CR heads and the Y pipe set up. I ran across it a while back and it brought back memories.

rbiron2 · « **Reply #20 on:** April 08, 2015, 02:11:39 PM »

My PT Hyperdyne.... would really like to get it setup and see how it runs! Don't know if it's worth spending money on though...