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I stared longingly at my poor husk of a Penton and almost cried because of just hooowwwww much work it's going to take to bring her back to life. Fixing to have to sell off a BUNCH of my old racers and non-racers to fund this one..

Thanks for the input Mr. Mike!! I guess I'll just have to find either a stock pipe or go ahead with having one made off my port map. I wish I had a way to throw a degree wheel on it so I could get the port map of it. But I have no way of doing that until I get the crank rebuilt, get a piston, get it bored (going up two bores just to make sure. An it's on maybe the first over bore (EZ-71 cylinder), get it all together etc etc etc. I REALLY need to get the cases that are on eBay for it. Mine are trashed.


Would anyone else be interested in a modern pipe?

Any thoughts y'all?

The port work is very very very nice. You can juusst barely see the traces of tooling in the corners but the rest is super clean and you can tell a lot of time and care was taken in doing it

The head fins (ignore the other motors an stuff in the background. Other projects lol)





The ports







And here's the signature


Something we do with the modern reed engines is port the reed cage (y'all prolly know that) so I figured I should take some pictures of the intake too



I realize that when I was cleaning up the ports trying to get the oxidation out of them I actually polished the intake side (derp) so I will be sure to go back and rough it up with a stone again


My uncles say that when they were riding it, it was a beast. When ever it came on pipe you BETTER be holding on and have it pointing in the general direction you hoped to go and that no matter what gear you were in it would stand up when it rolled into the powerband. We have a CR80 with an 85cc cylinder that was ran on a shifter kart (ports hogged out like CRAZY) that runs about like that.

So what y'all think???

Brian,
The fins are cut about where the divergent cone would be expanding at and then transitioning into the belly section. I figured it just had a fat pipe lol

Ill go snap some pictures right quick of ports, head, etc

Mine is a 76. Ill take and post some pictures when I get home. Thank you for the info!!

Well,, my 250 originally had an aftermarket pipe on it from what I can tell but it has miraculously been lost over the years. The reason I assume this is because the fins on the head have been cut at an angle (cut, not broke,,) and it doesn't look stock. What companies offered pipes for these beasties? And would anyone be wanting a modern pipe for one? I will be getting some dimensions so I can roll one out for mine is why I'm wondering.,,,,,

Oh,, my cylinder is also been ported. It's signed M. L. 4 - 80 on the bottom of the bottom fin. Wouldn't anyone happen to know who that might could be huh? I live in east Barton rouge if that helps any?

Hey y'all. My names Cj. I'm a younger guy (18) who loves all things old, especially in the power sports industry. I'm a huge fan of airfoolers so when my uncle offered to trade me this old Penton (as soon as he said Penton he had me...) for one of my 5.5hp Briggs motors you better believe I didn't stop grinning for DAYS!!

But, the ole gal is R. O. U. G. H.  Sometime in the early-mid 90's someone pulled the top end off and since Louisiana aint exactly the DRIEST state the bottom end filled with water and stayed that way long enough to trash the center cases (ate a hole plum through). The shocks are rusted to hell an back, there bolts and nuts breaking off everywhere, I'm SCARED to even try moving the swinger bolt. I mean do y'all get the picture I'm painting here? It's not real pretty. From my best estimation it's gunna cost me about $2000 before shocks. I'm gunna try and find some modern shocks (by modern I mean 80's Fox or something) until I can get the original Marz (can't spell the name,,,) repaired (the shafts are destroyed. Rusted way beyond saving). Ill get some pictures uploaded here sometime. I gotta get on the computer to do that. So, that's about all I can think to say right now.... There's some cases on eBay I've been watching but my old school ATC90 racer build is sapping my money up right now so hopefully they don't sell before I got the $$$.....

Nice to meet y'all!!

-Cj