Difference between revisions of "Honda MB5"

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The '''Honda MB5''' is a 50cc, 5 speed motorcycle that was only imported into the US in 1982. I It is, in fact, not a [[moped]] at all.  However, it fits into moped culture due to its small displacement 2-stroke engine. Some features found on the MB5 were a speedometer, a tachometer (with a redline of 10,500 rpm), front disc brake, and Honda's Comstar wheels. The MB was the road oriented version of the Honda MT50.
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{{TOCright}}
  
 +
== Honda MB5 Forum==
 +
http://www.mb5web.com/
  
'''External Links'''
 
*http://www.cmsnl.com/honda-mb50z-mb-5-1979-japanese-home-market_model16382/partslist/
 
:This site has really useful exploded diagrams so you know where everything goes.
 
  
 +
==Honda MB5 (or MB50)==
 +
The '''Honda MB5''' is a 50cc, 5 speed motorcycle that was only imported into the US in 1982. It is, in fact, not a [[moped]] at all.  However, it fits into moped culture due to its small displacement 2-stroke engine. Some features found on the MB5 were a speedometer, a tachometer (with a redline of 10,500 rpm), front disc brake, and Honda's Comstar wheels. The MB was the road oriented version of the Honda MT50.
 +
 +
==Tech Specs==
 +
<table border="1" cellpadding="5">
 +
<tr>
 +
  <th colspan="2">Dimensions</th>
 +
</tr>
 +
<tr>
 +
  <td>Overall Length</td>
 +
  <td>74 in (1880mm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Overall Width</td>
 +
  <td>27.8 in (705 mm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Overall Height</td>
 +
  <td>40.4 in (1025mm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Wheelbase</td>
 +
  <td>47.8 in (1215 mm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Seat Height</td>
 +
  <td>29.5 in (750 mm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Foot Peg Height</td>
 +
  <td>12.2 in (310 mm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Ground Clearance</td>
 +
  <td>6.3 in (160 mm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Dry Weight</td>
 +
  <td>174 lb (79 kg)</td>
 +
</tr>
 +
<tr>
 +
  <td>Curb Weight</td>
 +
  <td>198 lb (90 kg)</td>
 +
</tr>
 +
 +
 +
 +
<tr>
 +
  <th colspan="2">Frame</th>
 +
</tr>
 +
<tr>
 +
  <td>Type</td>
 +
  <td>Cross line backbone</td>
 +
</tr>
 +
<tr>
 +
  <td>Front Suspension,<br/>travel</td>
 +
  <td>Telescopic fork (dampenerod),<br/>4.9 in (125 mm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Rear Suspension,<br />travel</td>
 +
  <td>Swingarm/twin shock absorber,<br />3.5 in (90mm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Gross Vehicle Weight Rating</td>
 +
  <td>416.7 lb (189 kg)</td>
 +
</tr>
 +
<tr>
 +
  <td>Vehicle Capacity load</td>
 +
  <td>220.5 lb (100 kg)</td>
 +
</tr>
 +
<tr>
 +
  <td>Tire Size, front &amp; rear</td>
 +
  <td>2.50 x 18</td>
 +
</tr>
 +
<tr>
 +
  <td>Tire Pressure, front<br />rear</td>
 +
  <td>25 psi (175 kPa) front<br />32 psi (225 kPa) rear</td>
 +
</tr>
 +
<tr>
 +
  <td>Front brake, lining swept area</td>
 +
  <td>Single disc brake, 59.6 sq in<br />(384 sq cm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Rear brake, lining swept area</td>
 +
  <td>Internal expanding shoe,<br />13.4 sq in (86.4 sq cm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Fuel Capacity</td>
 +
  <td>2.4 US gal (9.0 liters)</td>
 +
</tr>
 +
<tr>
 +
  <td>Fuel reserve capacity</td>
 +
  <td>0.5 US gal (2.0 liters)</td>
 +
</tr>
 +
<tr>
 +
  <td>Caster angle</td>
 +
  <td>25 degrees</td>
 +
</tr>
 +
<tr>
 +
  <td>Trail</td>
 +
  <td>2.8 in (70mm)</td>
 +
</tr>
 +
<tr>
 +
  <td>Front Fork Oil Capacity</td>
 +
  <td>2.54 ozs (75 cc)</td>
 +
</tr>
 +
 +
 +
 +
<tr>
 +
  <th colspan="2">Engine</th>
 +
</tr>
 +
<tr>
 +
  <td>Type</td>
 +
  <td>Air cooled 2-stroke, reed valve</td>
 +
</tr>
 +
<tr>
 +
  <td>Cylinder arrangement</td>
 +
  <td>Single cylinder 40 degree incline</td>
 +
</tr>
 +
<tr>
 +
  <td>Bore and Stroke</td>
 +
  <td>39.0 x 41.4 mm (1.54 x 1.63 in)</td>
 +
</tr>
 +
<tr>
 +
  <td>Displacement</td>
 +
  <td>49cc (2.98 cu in)</td>
 +
</tr>
 +
<tr>
 +
  <td>Compression ratio</td>
 +
  <td>7.6:1</td>
 +
</tr>
 +
<tr>
 +
  <td>Max Horsepower</td>
 +
  <td>7.0 BHP @ 9000 rpm</td>
 +
</tr>
 +
<tr>
 +
  <td>Max Torque</td>
 +
  <td>4.05 ft-lb (5.6 N-m)</td>
 +
</tr>
 +
<tr>
 +
  <td>Oil Capacity, transmission<br />Oil tank</td>
 +
  <td>1.1 US qt (1.0 liters)<br />1.2 US qt (1.1 liters)</td>
 +
</tr>
 +
<tr>
 +
  <td>Lubrication system</td>
 +
  <td>Forced (eng) and wet sump (tranny)</td>
 +
</tr>
 +
<tr>
 +
  <td>Air Filtration</td>
 +
  <td>Oiled polyurethane foam</td>
 +
</tr>
 +
<tr>
 +
  <td>Cylinder compression</td>
 +
  <td>185 psi (1275 kPa)</td>
 +
</tr>
 +
<tr>
 +
  <td>Engine weight</td>
 +
  <td>38.6 lb (17.5 kg)</td>
 +
</tr>
 +
<tr>
 +
  <td>Idle Speed</td>
 +
  <td>1400 rpm</td>
 +
</tr>
 +
 +
 +
 +
<tr>
 +
  <th colspan="2">Carburetion</th>
 +
</tr>
 +
<tr>
 +
  <td>Carb Type</td>
 +
  <td>PF 15, 16mm venturi bore</td>
 +
</tr>
 +
<tr>
 +
  <td>ID Number</td>
 +
  <td>PF 15A</td>
 +
</tr>
 +
<tr>
 +
  <td>Air Screw initial setting</td>
 +
  <td>1 3/8 turns out</td>
 +
</tr>
 +
<tr>
 +
  <td>Float level</td>
 +
  <td>13.5 mm (0.53 in)</td>
 +
</tr>
 +
<tr>
 +
  <td>Main jet, standard</td>
 +
  <td>#105</td>
 +
</tr>
 +
<tr>
 +
  <td>Main air jet, standard</td>
 +
  <td>#210</td>
 +
</tr>
 +
<tr>
 +
  <td>Jet needle &amp; position, standard</td>
 +
  <td>37B - 2nd groove</td>
 +
</tr>
 +
<tr>
 +
  <td>Slow/Pilot jet, standard</td>
 +
  <td>#38</td>
 +
</tr>
 +
 +
 +
 +
<tr>
 +
  <th colspan="2">Drive Train</th>
 +
</tr>
 +
<tr>
 +
  <td>Clutch</td>
 +
  <td>Wet, multi-plate</td>
 +
</tr>
 +
<tr>
 +
  <td>Transmission</td>
 +
  <td>5-speed constant-mesh</td>
 +
</tr>
 +
<tr>
 +
  <td>Primary reduction</td>
 +
  <td>4.117</td>
 +
</tr>
 +
<tr>
 +
  <td>Final reduction (sprockets)</td>
 +
  <td>3.307 (43/13)</td>
 +
</tr>
 +
<tr>
 +
  <td>Gear ratios, 1 to 5</td>
 +
  <td>3.083, 1.882, 1.400, 1.130, 0.960</td>
 +
</tr>
 +
<tr>
 +
  <td>Gear shift pattern</td>
 +
  <td>left foot operated, 1-N-2-3-4-5</td>
 +
</tr>
 +
<tr>
 +
  <td><br /></td>
 +
  <td><br /></td>
 +
</tr>
 +
 +
 +
 +
<tr>
 +
  <th colspan="2">Electrical</th>
 +
</tr>
 +
<tr>
 +
  <td>Ignition</td>
 +
  <td>CDI (Capacitor Discharge Ignition)</td>
 +
</tr>
 +
<tr>
 +
  <td>Ignition timing "F" mark</td>
 +
  <td>19 +or- 3 degrees BTDC @ 3000 rpm</td>
 +
</tr>
 +
<tr>
 +
  <td>Full retard</td>
 +
  <td>10 +or- 5 degrees BTDC @ 7000 rpm</td>
 +
</tr>
 +
<tr>
 +
  <td>Starting system</td>
 +
  <td>Primary kickstarter</td>
 +
</tr>
 +
<tr>
 +
  <td>Generator</td>
 +
  <td>AC generator 66W @ 5000 rpm</td>
 +
</tr>
 +
<tr>
 +
  <td>Battery capacity</td>
 +
  <td>12V - 2.5 AH (YB2.5L-C)</td>
 +
</tr>
 +
<tr>
 +
  <td>Spark plug, standard<br />extended high speed riding<br />cold climate, below 5 C or 41 F</td>
 +
  <td>NGK BR8HS, ND W24FSR<br />NGK BR9HS, ND W27FSR<br />NGK BR7HS, ND W22FSR</td>
 +
</tr>
 +
<tr>
 +
  <td>Spark plug gap</td>
 +
  <td>0.6-0.7 mm (0.024-0.028 in)</td>
 +
</tr>
 +
<tr>
 +
  <td>Fuse</td>
 +
  <td>7 Amp</td>
 +
</tr>
 +
 +
 +
 +
<tr>
 +
  <th colspan="2">Lights</th>
 +
</tr>
 +
<tr>
 +
  <td>Headlight (high/low beam)</td>
 +
  <td>31.5/30 W (sealed beam)</td>
 +
</tr>
 +
<tr>
 +
  <td>Tail/Stoplight</td>
 +
  <td>8/27W  3/32 cp (#1157)</td>
 +
</tr>
 +
<tr>
 +
  <td>Front turn signal</td>
 +
  <td>23W  32 cp (#1073)</td>
 +
</tr>
 +
<tr>
 +
  <td>Rear turn signal</td>
 +
  <td>23W  32 cp (#1073)</td>
 +
</tr>
 +
<tr>
 +
  <td>Speedometer light</td>
 +
  <td>3.4W  2 cp (#158)</td>
 +
</tr>
 +
<tr>
 +
  <td>Tachometer light</td>
 +
  <td>3.4W  2 cp (#158)</td>
 +
</tr>
 +
<tr>
 +
  <td>Neutral light</td>
 +
  <td>3.4W  2 cp (#158)</td>
 +
</tr>
 +
<tr>
 +
  <td>Turn signal indicator</td>
 +
  <td>3.4W  2 cp (#158)</td>
 +
</tr>
 +
<tr>
 +
  <td>High beam indicator</td>
 +
  <td>1.7W  1 cp (#53)</td>
 +
</tr>
 +
</table>
 +
 +
==MB5 Threads==
 +
Some threads covering a lot of questions / issues people have had with mb5's
 +
*[http://www.mopedarmy.com/forums/discuss/7/188026/187954/ MB5 Questions for MB5 Dudes]
 +
*[http://www.mopedarmy.com/forums/discuss/read.php?f=7&i=195437&t=195390&v=f MB5 Dudes Thread Take 2]
 +
*[http://www.mopedarmy.com/forums/read.php?7,2797082 MB5 Dudes Thread Take 3]
 +
 +
 +
==External Links==
 +
*[https://sites.google.com/site/mb5supersite/home MB5 Supersite] -- An awesome site for MB5 lovers. Lots of good technical information and advice.
 +
*[http://www.mb5web.com MB5 Forums] -- MB5 owners forum.
 +
*[http://www.cmsnl.com/honda-mb50z-mb-5-1979-japanese-home-market_model16382/partslist/ MB5 parts list] -- This site has really useful exploded diagrams so you know where everything goes.
 +
*[http://projectmopedmanual.info/Manual_HTML/honda.html Honda Manuals] -- more MB5 wiring diagrams, parts and owner's manual downloads
 +
*[http://mohawkmammoths.com/Honda_MB5_Shop_Manual.pdf MB5 Shop Manual] -- 90MB, high resolution, good quality
 +
*[http://www.retrojunk.com/details_commercial/17452/ MB5 commercial] -- Honda MB5 commercial from back in the day.
 +
*[http://www.facebook.com/groups/2787440729/ Honda MB5 Owners] -- Honda MB5 Owners (FB login required), small community of MB5 owners across the world.
  
 
[[Category: Moped Models]]
 
[[Category: Moped Models]]
 
[[Category: Honda|MB5]]
 
[[Category: Honda|MB5]]
 
+
[[Category: Fifty Shifty]]
{{stub}}
 

Latest revision as of 12:37, 3 January 2020

Honda MB5 Forum

http://www.mb5web.com/ 


Honda MB5 (or MB50)

The Honda MB5 is a 50cc, 5 speed motorcycle that was only imported into the US in 1982. It is, in fact, not a moped at all. However, it fits into moped culture due to its small displacement 2-stroke engine. Some features found on the MB5 were a speedometer, a tachometer (with a redline of 10,500 rpm), front disc brake, and Honda's Comstar wheels. The MB was the road oriented version of the Honda MT50.

Tech Specs

Dimensions
Overall Length 74 in (1880mm)
Overall Width 27.8 in (705 mm)
Overall Height 40.4 in (1025mm)
Wheelbase 47.8 in (1215 mm)
Seat Height 29.5 in (750 mm)
Foot Peg Height 12.2 in (310 mm)
Ground Clearance 6.3 in (160 mm)
Dry Weight 174 lb (79 kg)
Curb Weight 198 lb (90 kg)
Frame
Type Cross line backbone
Front Suspension,
travel
Telescopic fork (dampenerod),
4.9 in (125 mm)
Rear Suspension,
travel
Swingarm/twin shock absorber,
3.5 in (90mm)
Gross Vehicle Weight Rating 416.7 lb (189 kg)
Vehicle Capacity load 220.5 lb (100 kg)
Tire Size, front & rear 2.50 x 18
Tire Pressure, front
rear
25 psi (175 kPa) front
32 psi (225 kPa) rear
Front brake, lining swept area Single disc brake, 59.6 sq in
(384 sq cm)
Rear brake, lining swept area Internal expanding shoe,
13.4 sq in (86.4 sq cm)
Fuel Capacity 2.4 US gal (9.0 liters)
Fuel reserve capacity 0.5 US gal (2.0 liters)
Caster angle 25 degrees
Trail 2.8 in (70mm)
Front Fork Oil Capacity 2.54 ozs (75 cc)
Engine
Type Air cooled 2-stroke, reed valve
Cylinder arrangement Single cylinder 40 degree incline
Bore and Stroke 39.0 x 41.4 mm (1.54 x 1.63 in)
Displacement 49cc (2.98 cu in)
Compression ratio 7.6:1
Max Horsepower 7.0 BHP @ 9000 rpm
Max Torque 4.05 ft-lb (5.6 N-m)
Oil Capacity, transmission
Oil tank
1.1 US qt (1.0 liters)
1.2 US qt (1.1 liters)
Lubrication system Forced (eng) and wet sump (tranny)
Air Filtration Oiled polyurethane foam
Cylinder compression 185 psi (1275 kPa)
Engine weight 38.6 lb (17.5 kg)
Idle Speed 1400 rpm
Carburetion
Carb Type PF 15, 16mm venturi bore
ID Number PF 15A
Air Screw initial setting 1 3/8 turns out
Float level 13.5 mm (0.53 in)
Main jet, standard #105
Main air jet, standard #210
Jet needle & position, standard 37B - 2nd groove
Slow/Pilot jet, standard #38
Drive Train
Clutch Wet, multi-plate
Transmission 5-speed constant-mesh
Primary reduction 4.117
Final reduction (sprockets) 3.307 (43/13)
Gear ratios, 1 to 5 3.083, 1.882, 1.400, 1.130, 0.960
Gear shift pattern left foot operated, 1-N-2-3-4-5


Electrical
Ignition CDI (Capacitor Discharge Ignition)
Ignition timing "F" mark 19 +or- 3 degrees BTDC @ 3000 rpm
Full retard 10 +or- 5 degrees BTDC @ 7000 rpm
Starting system Primary kickstarter
Generator AC generator 66W @ 5000 rpm
Battery capacity 12V - 2.5 AH (YB2.5L-C)
Spark plug, standard
extended high speed riding
cold climate, below 5 C or 41 F
NGK BR8HS, ND W24FSR
NGK BR9HS, ND W27FSR
NGK BR7HS, ND W22FSR
Spark plug gap 0.6-0.7 mm (0.024-0.028 in)
Fuse 7 Amp
Lights
Headlight (high/low beam) 31.5/30 W (sealed beam)
Tail/Stoplight 8/27W 3/32 cp (#1157)
Front turn signal 23W 32 cp (#1073)
Rear turn signal 23W 32 cp (#1073)
Speedometer light 3.4W 2 cp (#158)
Tachometer light 3.4W 2 cp (#158)
Neutral light 3.4W 2 cp (#158)
Turn signal indicator 3.4W 2 cp (#158)
High beam indicator 1.7W 1 cp (#53)

MB5 Threads

Some threads covering a lot of questions / issues people have had with mb5's


External Links

  • MB5 Supersite -- An awesome site for MB5 lovers. Lots of good technical information and advice.
  • MB5 Forums -- MB5 owners forum.
  • MB5 parts list -- This site has really useful exploded diagrams so you know where everything goes.
  • Honda Manuals -- more MB5 wiring diagrams, parts and owner's manual downloads
  • MB5 Shop Manual -- 90MB, high resolution, good quality
  • MB5 commercial -- Honda MB5 commercial from back in the day.
  • Honda MB5 Owners -- Honda MB5 Owners (FB login required), small community of MB5 owners across the world.