Technical Data

All models w/ electric starter unless otherwise indicated
Sorry, but I don't have the data for the R204. If you have it, please email me.


  Bella R150 w/o Starter Bella R151 Bella R153 Bella R154 Bella R200 w/o starter Bella R201 Bella R203 Bella R204

Capacity (cc)

 146 146 146 146 198 198 198  

Stroke/Bore (mm)

 58/57 58/57 58/57 58/57 62/64 62/64 62/64  

Compression Chamber (cc)

 26+1 26+1 26+1 26+1 37.5+1 37+1 37+1  

Compression Ratio

 1:6.7 1:6.7 1:6.7 1:6.7 1:6.3 1:6.3 1:6.3  

Engine Output (HP)

 7.3 @ 4700rpm 7.3 @ 4700rpm 7.3 @ 4700rpm 7.3 @ 4700rpm 10 @ 5200rpm 10 @ 5200 10 @ 5200  

Piston Clearance (mm)

 0.05 0.05 0.06 0.06 0.06 0.06 0.06  

Electric System, Noris Type

 MLZn 60/6/1600/R LA 12/100/3 L LA 12/100/3 L LA 12/100/3 L MLZn 60/6/1600/R LA 12/100/3 L LA 12/100/3 L  

Advanced Timing (mm before tdc)

 3.0 3.0 3.0 3.0 3.0 3.0 3.0  

Advanced Timing (degrees before tdc)

 23 23 23.5 23.5 23 23 22.5  

Heat Value of Sparkplug

 225 225 225 225 225 225 225  
 

Carburettor Type "Bing"

 2/20/15 1/20/15 1/20/19 1/20/19 1/20/19 1/20/38* 2/24/40 1/22/79 1/22/89 1/22/89 1/22/96* 1/22/110*  

Opening (mm)

 20 20 20 20 20 20 24 22 22 22 22 22  

Main Jet

 90 110 110 110 110 110 110 110 105 105 100 110  

Pilot Jet

 40 45 45 45 45 45 35 40 45 45 45 35  

Needle Jet

 2.68 1508 1508 1508 1508 1508 1508 1508 1508 1508 1508 1608  

Needle Position from Top, Groove

 2 2 3 3 3 3 3 3 3 3 3 3  

Starter Jet

 - 70 80 80 80 80 - 70 85 85 85 85  

Air Adjusting Screw Turns Open

 1-1½ 1½ 1½ 1½-2 1½-2 1½ 1½ 1½ 1½ 1½ 1½ 1½  

Mixing Chamber Insert

 3 - - - - - - - - - - -  

Gas Slide

 - 33 13 13 13 13 - 33 13 13 13 13  

Oil in Gearbox (cc)

 650 650 650 650 650 650 650  

Grade of Oil Below +15 deg. C (60 deg. F)

 SAE 20 SAE 20 SAE 20 SAE 20 SAE 20 SAE 20 SAE 20  

Grade of Oil Above +15 deg. C (60 deg. F)

 SAE 50 SAE 50 SAE 50 SAE 50 SAE 50 SAE 50 SAE 50  

Ratio of Mix

 1:25 1:25 1:25 1:25 1:25 1:25 1:25  
 

Gear Ratios:

1st gear

 1:3.14 1:3.14 1:3.14 1:3.14 1:3.14 1:3.14 1:3.14  

2nd gear

 1:1.964 1:1.964 1:1.964 1:1.964 1:1.964 1:1.964 1:1.964  

3rd gear

 1:1.405 1:1.405 1:1.405 1:1.405 1:1.405 1:1.405 1:1.405  

4th gear

 1:1 1:1 1:1 1:1 1:1 1:1 1:1  

* - only in combination with intake silencer in right-hand cover flap

Source: Zündapp Service Manual: Repair Work on the twostroke engine. Zündapp-Werke GMBH - Nürnberg - Munchen

All contents copyright © 1998-2004 Eric Porter unless otherwise noted.