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Parts Microfiche Online HERE!
With part # and all dealer microfiche images
Click Here!

The Honda MB5 Headlight fix!
 Craig has a new fix for the Honda MB5 headlight, it looks and fits like stock and is a sealed beam, plugs right in! They are $90 plus shipping. He will usually have one in stock, but may require a couple extra days if he is out. Email him here. He will be accepting Paypal to this address, Email Craig

Battery and Headlight issues, check out the How-To page.

Perk LLC
The place to get hard to find parts, discontinued parts and European parts in the USA.
He has the ignition switches, headlights, etc.

So you want to make your MB5 faster?
    Well first of all, I would like to state that if you live in the USA, there are no aftermarket parts available for the MB5 in the USA. Perk LLC is the only one I know of in the USA (Indiana) that is importing parts, he has a bunch of stuff in stock.
You can get:  1) pipes 2)reeds 3)carbs, 4)50cc & 70cc cylinder kits 5)re-gear the chain drive, etc. 
If you want to get real fast, you need porting, matched pipe, larger carb, and re-geared sprockets.
But how fast can you really get a 50cc bike going? Go as big as you want. Have fun!

Making your MB5 faster!
I have learned how to make your MB5 faster, without importing European parts, just go down to your local Honda dealer or salvage yard. A Honda 1980-82 CR80 (air cooled) has some parts that bolt on and some that require slight modification
6-speed tranny - The CR80 (80-82) 6-speed tranny will fit right into your MB5 cases, you must use the all the gears, shafts, washers, shift drum, shift forks, etc. 
Big Clutch - UPDATE The CR80 clutch is a 4 fiber plate/3 metal plate clutch that also bolts in (MB5 has a 3 fiber/2metal plate clutch). From the CR80, you only need to use the outer hub and one more fiber and steel plate, but I highly recommend you replace all the plates as a set.
The inner hub, basket, springs, and plates are the same as the MB5.
80cc Cylinder. - The CR80 cylinder can work, but does require a good amount of modification. This modification is only for those mechanically inclined. You use the CR80 cylinder (cyl), base and head gasket, but use the MB5 head. The transfer ports on the MB5 cases are not big enough to accommodate the CR80 cyl., so you have to weld on more aluminum around the side of the cyl mounting on the cases. You would know what I mean if you lay to CR80 base gasket on the MB5 cases. Plus you must weld on aluminum behind the flywheel on the left and above the crankshaft gear on the right. This must be done because when you grind away the material to match the transfer ports of the CR80 cases the area is too thin so you must add material. The best way is to have CR80 cases next to you when you do this mod., so you can match them the best. You must use the CR80 crankshaft/rod assembly because of differences in the rod, don't worry, it is a direct swap. Then use the CR80 cyl studs. You will need to modify the MB5 head for the bigger bore, this will need to be done on a lathe so you can reshape and expand the combustion area, easily done on a lathe. Then, put your motor together and drill a new head stay hole in the frame, this is pretty easy. Use the CR80 reeds, intake and carburetor. You will need a pipe to match the power, either use the stock CR80 pipe, cut, rotate, weld and make it fit, or if you are 2-stroke tuner, make your own pipe for the power you want. Greg, the guy that did this mod said with the CR80 cyl, carb, and a custom pipe said 70 mph, and wheelies in the first 2 gears!
- What won't work:
    The CR80 head won't work, no head mount, you'll need the modified MB5 head.
    The MB5 cyl studs are too short and base/head gaskets are wrong size, use the CR's.
    The MB5 crankshaft/rod assembly, must use CR's, it is a easy direct swap
    The MB5 reeds, intake and carb are different than the CR80, won't work, use the CR's.
    Stock MB5 pipe won't work, wrong mount, wrong size, wrong power, all wrong for 80cc
    The CR80 complete motor will NOT bolt directly into the MB5 frame, but you can custom
    mount it in there, better yet, use a bigger and better motor if you are going to do a swap. 

If you have more questions, feel free to email me dallas, or even better, email Greg, the man who has done these mods. (his old MB5 with these mods is pictured in the pics section, the one with the Porsche symbol in the background) 
All info used by permission of Greg M.
 

1982 Honda MB5 (USA) Repair Manual Tear-Down Images
Alternator
Balancer
Carburetor
Cylinder
Front Wheel/Suspension
Gearbox
Clutch/Kickstarter
Rear Wheel/Suspension
Wiring Diagram (Simplified Version)
Wiring Diagram (Technical Version) Caution: 151 KB

MB5 Specifications - go here

If you have something that would fit on this page, please e-mail me now!