125 Cylinder Porting

[Ed Barth]

Saw a cylinder for sale on eBay with some unique porting that even the seller wasn't sure of. Have any of you seen porting like this?





Look at this on eBay
PENTON KTM CYLINDER JUG 125 SIX DAY OEM VINTAGE AHRMA 54ZN5W1 MX

I'm looking for a spare cylinder to have ready for the next rebuild.

Thanks guys,

Ed Barth

'73 Penton 125 Six Days
'73 Yamaha DT3 250
'04 KTM 125 SX
'06 KTM 250 SX
'13 KTM 250 XC

[Dale Fisher]

This cylinder has been on auction for quite some time with no comments.  In my opinion it looks doubtful it would work.

http://www.pentonusa.org/forum/topic.asp?TOPIC_ID=15690&SearchTerms=ebay

Dale Fisher
Penton Owners Group - President/Memberships
POG Merchandise
Mudlark Registry
Facebook - Penton Owners Group - Administrator
Facebook - Cheney Racing Group - Administrator

'70 Six-Day 125 - V2017
'72 Mudlark - W257
'73 Jackpiner - 175 21159727
'74 Berkshire 100 - 40171056
'98 HP-14 Hi-Point
And some silly other bikes...

[JP Morgen]

A pretty rough job of boost porting. I am sure it would "work", but may decrease piston/ring life.