The "Periodic Maintenance / Lubrication Intervals" schedule is taken directly from a 1990 edition Honda CH250 Factory Service Manual, which covers the '89 and '90 Elites. This data is the same for the Helix, according to the 1993 edition Honda CN250 Factory Service Manual.  Before starting any work, always consult the manual for your scooter's model & year and be sure you know what you're doing.

CH250 Periodic Maintenance / Lubrication Intervals

R: Replace    C: Clean    L: Lubricate   A: Adjust

Item

Remarks

Type

 600 mi (1000 km) 4,000 mi
(6,400 km)		 Thereafter every
8,000 mi (12,800 km)		 Thereafter every
12,000 mi (19,200 km)
16,000 mi (25,600 km)
Fuel Line* Refer to service manual      

I

 I 
Throttle Operation* Refer to service manual       I I  
Air filter Service more frequently in wet or dusty areas         R  
Crankcase Breather Service more frequently when riding in the rain or at high speeds.     C C C C
Spark Plug   NGK DPR6EA-9   R R R R
Valve Clearance* Set to one graduation (which is .004")   I   I   I
Engine Oil Replace every 1000 miles SAE 10W30 type SE motor oil R R R R R
Engine oil strainer screen* Replace every 1000 miles SAE 10W30 type SE motor oil     C   C
Carburetor, idle speed*   1500 rpm +/- 100 rpm I I I I I
Radiator coolant Replace every two years 50/50 water/coolant mix     R   R
Cooling system* Refer to service manual       I   I
Evaporative emission control system* California models only         I  
Drive belt* Check cracks and wear. Replace if necessary.       I R I
Belt case air cleaner       C C C

C
Final drive oil* Replace every year SAE 10W30 motor oil R     R

 
Brake shoe wear Refer to service manual Front & Rear: DP9125, EBC341, EBC350   I I I

I

Brake system Refer to service manual  

I

   I  

I

Brake light switch* Refer to service manual       I  

I
Starter limit switch* Refer to service manual Lithium based grease   I I I

I
Brake lock operation* Refer to service manual    

I

I

I

I
Headlight aim*        

I

  

I
Clutch shoe wear* Refer to service manual    

I

I

I

I
Side stand  

Lithium based grease

    

I

  

I
Suspension* Refer to service manual      

I

  

I
Nuts, bolts, fasteners* Refer to service manual The clock battery is type LR44H, SR44, or 357 silver oxide (all of these are the same battery)

I

  

I

  

I
Wheels, tires* Front 25 psi
Rear 29 (36 max) psi		 Front & Rear: 4.00 x 10    

I

  

I
Steering head bearings* Refer to service manual

Lithium based grease

I

  

I

  

I

* Should be serviced by an authorized Honda dealer, unless the owner has the proper tools, service data and mechanical knowledge to do the work.

Battery type: YTX12-BS, CTX12-BS (these are sealed batteries)

Vehicle Identification Number Locations

Engine VIN location (at the rear of the engine, next to the wheel)
Frame VIN location (under the seat)