Maxi N Racer

by Richard Lay

BUILD DESCRIPTION

After hunting for years I finally found a beat up 76 Maxi N with a e50 . I tossed a treat land 70cc kit on and a pipe and ripped it around at a face blazing 36 mph while I gathered the parts together to build it up. Planing on a za50 , repaint and revamp. I purchased another maxi with a za50 that I believe may have been in the Boston sound for a few seasons ... This was the rustiest ,crustiest piece of crap Puch I have ever seen and after stripping it for parts determined that the only useable ones where the cases and one light bulb . I cleaned the cases and got to work .Replaced all the bearings and line bored for the gila kit .Enlarged the transfers huge and matched the cylinder for maximum blastliness . A little port clean up but this was my first gila kit so I wanted to know how it was with unmodified port timing .Cut the case for a 22 tooth front sprocket and TIG welded in a backer so it wouldn't fling shit into the magneto . I Then cut the cases with sandpaper up to 1000 grit and polished them to mirror finish with tripoli and a wheel .Installing a new 1977 intake for the tm24. It was their new aluminum one. looking pretty slick after it was ported inside then sanded and polished . But the fitment was crap .It really did not fit the maxi N Frame . It probably fit on a magnum like a sexy glove of love but was poorly aimed into the frame so I cut and TIGed it back together to achieve a mint fitment on the N chassis . Stripped, smoothed ,primed and painted the frame with a color I had found on a new Corvette . I ordered the paint from a local Car Quest over the phone and had them mix it up for me . When I went to pick it up the clerck told me it was 295$ for the pint ...... Damm !!! So much for building this one on the cheep. This is the last time I will have paint mixed up without a price from them up front first .But It looks sharp. Rather a bright orange in light and more cooper bronze in the dark . Keeping it nostalgic for the old Puchie .Acquired some flaking 5 stars from Will on Mopedarmy after getting jerked around by two other sellers that apparently thought Paypall was a ATM funded by members .Dirt blasted them and painted them with F1 gloss black. New sealed bearings and discs from Mike through Treatland .Knowing that they would need custom spacing to fit to the China pit bike calipers I had pirated off an Apollo earlier I opted to not Purchase the hubs and fab my own spacers .I wanted to make front and rear disk with the rear caliper floating off the axle so that chain tension wouldn't be an issue in the future .The rear was everything short of easy. The amount of room that is required to allow the caliper to sit properly and not interfere with the freewheel assembly is minimul . Add to that the need for it to slide coupled to a anchor point that will not destroy the thin maxi N "swing arm" and you are really only left with a small window where you can achieve success . I compiled the bracket from 1/4 SS in multiple pieces and tacked them together in place until it looked like it came that way .Disassembled it ,welded it solid, painted. Purchased a pair of Ebay China 12mm bore matching levers. I used the factory front forks with the disc brakes and they worked fine despite what other had experienced .They where capiable of stopping the bike faster than I had imagined short of hitting a car or a tree or something. Hydraulic lines where made from -2an SS line with SS banjos and I was rather happy with the lever feel . All the Puch Peds I have had suffer from pathetic brake deficiency due to there small drum brakes . If I was going to be making it to the 60 mph mark .........It wasn't going to be happening on them. So ,now way over budget and weeks past my expected date of completion I decided to reward my failure with a Trail Tech Vapor, Led headlight conversion and Treatlands vertical fixation rear light . Keeping the electric simple meant no full bridge rectifier/regulator and no DC. led lighting should function ok on AC for short blasts around town after dark .I found some low bars that had a good racer feel . Shortening them two inches and painting them with a hand full of odds and ends I missed the first few rounds before tossing them on . I then refit a seat from some older BMW street bike . The springs now chopped out and lowered I pushed it back as far as possible with the original post location. Tucking the Led light up under and welding a bracket to support it .On to the exhaust ...Excited to have a new pipe that I recently purchased from treatland . Some estriol sideblead deal with a carbon silencer . It hit in every possible place so It recived the grinder and welder refit . The header was cut and the exhaust flange realigned for the gila. The expansion portion where it once hit the axle bolt and swing arm was cut off and flat stock was welded in . The pipe now matching the contors of the bike finaly allowed the pedals to complete their orbit without interference .All finished it was painted with high temp ceramic paint and installed . Micro pedals where sourced from China and new chains were installed with a 35tooth rear sprocket . A "Fixie" type derailer was married to the new mounting point for my rear disk caliper bracket . At this point I decided It necessary to be running a Hpi mini rotor and not the points that I had on .So In a effort to drop a few degrees and add a few fractional ponies I placed another order to Treats . Once it was installed it wouldn't start ... reverifying 2.5mm BTDC and still no go . Previously running fine on the stand with the points but now backfiring and kicking through the pedal like a mule with the HPI . Putting the timing gun on it exposed that despite following the directions to the T It was out of time 75 degrees . A few emails back and forth between HPI determined that if I was to flip the sensor wires polarity against what was depicted in the instructions I should have spark when the timing lines where aligned .It worked and I was off for the test ride . A few days of tuning and I now have a fun little ZA50 maxi n that will do 60 mph .... Not 60 mph on some crapy Poo speedo . A Gps verified 60 and that was putting a smile on my face in Cape Cod summer traffic .

BUILD DETAILS

MOPED
1976 Puch Maxi N
carburetion
exhaust
transmission

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Maize Diffley: Looks great. Lets see more details of that rear disk brake.