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By the way here is the link.

http://cgi.ebay.com/ebaymotors/Other-Makes-Jackpiner-Penton-Jackpiner-175-Vintage-Motorcycle-1972-Enduro_W0QQcmdZViewItemQQcategoryZ6719QQihZ020QQitemZ300293763850QQrdZ1QQsspagenameZWDVW

This bike I am looking at is on Ebay.  I asked the seller for the motor and frame numbers and what I posted here is what he sent me.  I will ask him again if there is really a JP in the number and let you know.

Thanks,

mully

thanks for input gentlemen.

Mully

I have poored over this website and think I have this one figured out.

Frame#  51 31270344

using this bit of information:
The second type consists of the same 8 digits but also has an extra 7-, 51-, or 54- ahead of the original 8 digits. These extra digits could be called production codes for the lack of anything else to call them. These digits were only found on the KTM powered models. If the 7- appears, you are looking at an all-new Jackpiner model starting with June 1972 through June 1973. The 51- and 54- seem to start where the 7- number ends which is June 1973 through September 1976.  To find the year, month, and serial number, you simply disregard the 7-, 51- or 54- and look solely at the last 8 digits. For example, 7-20655454 would be a model built in June 1972, with the remaining digits again being the actual serial number.

I would be correct in saying the frame was produced in December of 73.

Engine number:  3 5402375

using this bit of information:
After working with these frame numbers, I thought it might be fun to do some research into KTM engine numbers. With some 75 engine numbers to work with, I separated them into 3 categories: Type 52 which is the 175cc, Type 54 which is the 250cc and Type 55 which is the 400cc. However, I did not have any Type 51 125cc numbers available. What I learned was that putting each type in ascending serial number order showed that each size engine serial number started back at 00000 and went forward, unlike the frame numbers and all its models that ran consecutively year after year.

I would be correct in saying engine was made in 73, and it is a 250.

So, using the information from the site it is pretty safe to say the bike I am looking at is indeed (frame and motor wise) a 74 250 ??

If the above is correct, are there any other pointers you fellas can bestowe upon me regarding what to look for...........

Mully

Frame # JP20554912
Engine # 2-5200387

Going through the explanation on serials numbers, am I safe to assume:
Frame = 1972 - May - 54912  (what is the JP designation?)
Engine 1972 175CC  

Just another penton that I am looking at.

Thanks in advance.

mully

This listing has caught my eye, and you talked a bit about it in the For Sale/Wanted forum.

http://cgi.ebay.com/ebaymotors/Other-Makes-1974-PENTON-125_W0QQcmdZViewItemQQcategoryZ6719QQihZ010QQitemZ200306633216QQrdZ1QQsspagenameZWDVW

Can anyone give me a thumbs up or down??  Is it a good restoration??
Close to original??

Also,  if I decide to go for it, I don't want to bid against anyone here that is already in the running.

Any help would be appreciated.

Mully

Ok, the bug has bitten me.  I am in the process of finding a restoration project.  The one I am looking at currently belongs to someone who really doesn't know what they have, as well as myself.  So if I may, I have a question (or two, or nine) regarding serial numbers.

51 31270344  is this a valid serial number for a 1974 Penton 250.
This serial number is on the frame.  Is there another serial number located anywhere else??

Thank you,

Mully