1973 CZ 420cc Type 981 Down Pipe Aluminium Tank

1973 CZ 420cc Type 981 Down Pipe Aluminium Tank

 

This is a bike from a test series from the CZ factory. The piston is the same as on the 380cc, but with a longer stroke which gives 420cc. 36mm Mikuni carburetor as it was on competition bikes. New Metzler tires. 80/100-21M/C 51R MST MC4 Front. 100/100-18 NHS MC4 Back. Adjustable spring. Updated swinging fork for better stability.

KONI rear springs.

It is “ready for race” and approved according to international and Swedish regulations.

Technical information

Engine: in new condition. 5 barrels. Full around crankshaft for higher compression. Piston 80.00 stroke 78. Modified control lever and starter lever

Gearbox:  Modified ratio. 4 Gears

Fuel tank: CZ Alloy 2.11 gallon

Carburator: Mikuni VM 36

Airfilter: Twin Air

Front fork: 180 mm front wheel travel. 4 Bolt bottom support. Spring adjustable in 3 positions. Plug for change of oil. Extra scrape rings. Fork boots to protect carrier tube

 

Front wheel: Rim alloy VM-1 extra strong, New Metzler MC 4 80/100 x 21. Tube extra strong. Magnesium hub 180 mm brake. Front brake wire 2.5 mm. Tube 8 mm improve brake effect

Rear wheel: Rim alloy VM-3. New Metzler MC 4 100/100 x 18. Tube extra strong. Magnesium hub 180 mm brake. Spokes 4 mm with steel nipples and in 2 cross.

Front mudguard: CZ original extra wide. Soft plastic

Rear mudguard: White plastic

Handlebar: CZ original with loose holder. Height 117 cm

Rear spring: KONI

Saddle: Harder rubber.  height 90 cm

Twistgrip: Gunnars quick throttle original

Chain: CZ original Type 520 H Cross. Chain adjuster roll upper and down

Frame:  1973-74 Chromolyden steel tube. Modified brake lever and brake tie-rod. Rocker grease nipple. Lock plate for rocker plug. Holder on back frame for stronger saddle mounting. Modified footrest.

Nuts: All with nylonlock

Weight: 102 kg

Extra:  Sprocket 13 t, 14 t, 14 t original. Tool kit. Service manual. Spare part catalogue. Mikuni super tuning. Stand.

Call us

(Technical questions are answered by phone)

Phone: +46-8-974050, Fax: +46-8-972090

Opening hours

(CET)
Monday – Friday 08:00 – 16:45
Saturday, Sunday closed.
Lunch: 11:00 – 12:00

Visit us

StiBo Motor
Altartorpsvägen 3, 141 70 Segeltorp
(Stockholm) Sweden

Email us

(Technical questions are answered by phone)

mikuni@stibomotor.se