KREIDLER: Mega Performance Thread
I recently decided to get back into the moped game... with another Kreidler. This time, it's a grey MP-19 in rough shape:
After some love, I got the motor to run. However, it has air leaks and loud crankshaft bearings, and I decided to rebuild.
I have sourced parts and knowledge in the past, but this time I decided to share my knowledge in one place. There is actually a decent amount of info out there about the MP motor, but most of what I've found has been on foreign forums (difficult to translate properly).
I'll share what I know currently, and will post updates as some of my parts begin arriving in the mail.
Sprocket (in ya pocket)
I found two places where you can purchase sprockets for this motor; eBay Germany and Kreidlerparts.com:
eBay Germany listings are difficult to sort through, since the sprockets are not in great supply, and the listing titles are inconsistent. I ordered a 14t sprocket through this method; however, the Kreidlerparts website appears to also carry a 15t sprocket.
My research about a kit or aftermarket cylinder has been inconclusive. Some people have ported stock cylinders with moderate performance gains; I have never attempted porting on a Kreidler cylinder. Maarten's Kreidler Club had a few threads on aftermarket cylinders, and I did not find any additional info there; but more searching may reveal more info. Also, the MP motor has the same stroke as the Florette, however I believe the stud spacing is different.
I have owned two bikes now with a modified Vespa Proma Circuit pipe from Treats. This has significantly increased power of the bike. Essentially, the stock header had to be welded to the Vespa pipe and braced to prevent undue stress on the cylinder exhaust port.
According to Myron's mopeds, the Kreidler piston uses 40mm x 1.5mm GI (GI (grano interno) = center pin gap style) style rings. Treats actually carries several sets of rings in this size, but I have never tried them:
Myron's Mopeds also carries various pistons for the MP motor. The thing to note is there were different sizes (noted by a letter stamped on the piston crown), so the cylinder you use must match the piston. For example, I have encountered several "H" and "D" and I think an "F" once. Kreidlerparts also sells aftermarket Zeta pistons:
Original crank bearings were FAG B015 bearings. These are hard to find, but I sourced several places to find them:
- Draganfly 15x40x9 - the 9 might be 10. I ordered a set of these but have yet to see them in the mail.
The two crank seals are not listed on Treats, but there are several that would work if you had the Kreidler MP case holes for the seals widened. Here are the sizes:
- x1 - 15x24x7
- x1 - 15x25x5
I ordered some seals from sketchy eBay vendors (1 was for a Stihl chainsaw), and have yet to try them. "NEW GENUINE OEM STIHL Chainsaw 15x25x5mm Oil Seal 9639-003-1584 (96390031584)"
Clutch Removal Tool
Shelly from Minnesota did a great writeup on making your own clutch tool for under $5 of hardware store items. Here is the link:
I have always made my own gaskets (except head gasket - and orangerobin tells me I can use thin copper for this) from Autozone grey gasket fiber / paper. But, I found a set of gaskets on eBay:
From what I've gathered, this bike uses the same ignition / stator as a Puch. Treats claims the HPI works on the MP motor, but I challenge someome to actually post a video on this.
Thanks and Mentions
To reach this level of knowledge, I had a lot of help through many, MANY people... however a few specifically related to Kreidler come to mind: the HnRz, Casserollers, Boot2TheHead, MA, and many various people who have helped me along the way. It was also Mike Biery that helped get me into the world of mopeds - and I am forever thankful.
|Doug Wilhelm||03/07/17 02:32AM|
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