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First gear ratios are the same on both 5 and six speed. Top gear ratios (fifth vs. sixth) are the same also.

Can you send me photos of both the carburetor and shocks?

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You might have a look at the clutch basket. The clutch plates can wear the edges of the basket and cause a dragging clutch.

I am sorry to hear of your misfortune, Still, what an adventure. Well done!

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I would like the cases, I would be happy to pay the shipping.

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Thanks for the interest, but I'm not ready to part with it yet. Needless to say, it was wore completely out when I parked it around 1982 or so.

Pate's Harley Davidson Yamaha and Penton. Located outside of Chattanooga in Hixson Tennessee on highway 153. Pate's was a long time Harley Davidson dealer in Chattanooga before moving into a larger building in Hixson. In the time I knew of the shop, Mrs. Pate ran the front, son's Drew and Joe worked the sales and the shop. I purchased two Pentons there. The first was a '73 125, used, It was returned to the shop after the first owner broke his leg riding it. I  started racing hare scrambles with it, then motocross. I rode the wheels of that bike. The next Penton was one of the first MC5s, a 250. It had sat on the show room for quite some time and Drew made me a good deal. Ha. I still have both bikes, the 125 has had almost everything replaced at one time or anther. The only thing I'm certain hasn't been replaced are the center cases, crankshaft and connecting rod. It's still ready to race! The MC5? Not so ready. It needs restoring,

Pate's was an interesting place in the 70s. Drew was a former national flat tracker and it was not unusual to find grand national racers stopping in. Gary and Hank Scott were regulars.  Some kid who was campaigning a Triumph lived in the warehouse for a time. I remember Joe locking the building up and setting the alarm at closing time. The kid had to stay in the warehouse or the alarm would go off. The only problem was the bathroom wasn't in the warehouse!

Retarded timing could cause exhaust header overheating (ignition firing closer to top dead center). Fuel still burning when exhaust port is open.

The part numbers you listed are for the type 84 carburetors. The stock carburetor on a 72 125 Six Day would have been a type 53 carburetor. You might want to call Bing and give them your carburetor number. The number is a stamped number on the intake side of the carburetor. It might look something like 1/27/XXX if it's a type 53 or something like 1/28/XXX if it's a type 84 carburetor. The Bing people are very helpful.

I didn't know about a bulletin from KTM or the mod to the compression hole that Larry and Tom talked about. But I have modified 40 mm fork tube damper rods for Race Tech emulators. I have some data if you're interested.

Are you working with the piccolo tube damper rods?

https://www.ebay.com/itm/Magura-Brake-Light-Switch-For-Power-Levers-BMW-Husy-Maico-Penton-AHRMA-VMX-VJMC/113616116694?hash=item1a740c5bd6:g:MGIAAOSwHSdcWKHD

The motoplat ignition does not have an internal voltage regulator. If you have a multimeter you could check voltage on any of the lighting wires, just be sure to set the meter to read AC volts. If it is set to DC volts you are not going to read anything. You could see as much as 17 volts AC out of a motoplat at high rpm. Generally, a 12 volt headlight will be alright.


Yellow wire is normally considered as headlight, green for stoplight, and white for taillight. But, you could just as well tie all three together send the output off to the lights or to a voltage regulator and then send the regulated voltage to the lights. If you are going to use the bike on the street, add a rectifier to change lighting voltage to DC and add a battery. The battery will keep the lights bright at idle rpm and just as importantly, keep the lights on if you stall the motor at a stop light on a dark night.

what voltage blub did you use?