| --------Fault---------- | --------Fault finding / Remedies---------- |
|---|---|
| Poor performance | |
| -Carburettor jets or fuel cock clogged or dirty | -Remove an clean / blow out with compressed air |
| -Excess of carbon deposits on cylinder ports / combustion chamber | -Decoke with hardwood scraper |
| -Air filter dirty | Air filter: remove filter and clean it or replace it |
| -Choke is inefficient | -Remove the choke from the carburetor and connect it to the battery. Me must pulling out a few mm in a few minutes, if not he is demaged Testing choke[LINK] -Alternative to the electric Choke is the machanic one:Read more [LINK] |
| -Clutch slipping | -Check or replace clutch facing |
| -Defective sliding of the mobile pulleys | -check parts for tribological of variator sliders , weights ,.... |
| -Belt worn | -replace it. |
| -Reed petals defective | -If you can see chink of light if you look straight through the reed valve you have to turn around the matal reed petals oder replace it |
| -Spark plug connector/ cable defective | -The resistance value of the spark plug connector is changing while time went by , just replace it |
| Hard starting | |
| -Carburettor jets or fuel cock clogged or dirty | -Clean carburettor maybe replace vacuum type petcock |
| -Too much gasoline in combustion chamber-> smell of petrol | -Carburettor floater closing to late.Click this [LINK] |
| -Fuel doesn't arrive | -Check if the carburettor gets petrol from the petcock,- if not check fuel pipe / vacuum pipe or replace petcock |
| -Choke doesn't work | -Watch above Testing E- Choke [LINK] |
| - Engine flooding | -Pull out the fuel-soaked spark plug, clean it, kick the kick starter without spark plug, so the fuel can be ejected |
| -Defective vacuum pipe / pulled | -Replace, or connect |
| -Ignition equipment faulty / defective spark plug | - Turn out the spark plug and abut the thread against the frame and you must see the ignition spark if not: change spark plug / cable / check generator |
| Hard starting: Engine rev up / starting problems | - Get a greater starting jet if no other fault can be finding Read more [LINK] |
| -Fuel closing needle jams | -Signs of damage: Fuel came out of the overflow pipe, replace closing needle - Repair float chamber valve |
| -Kick starter stuck | - Check the return spring / cleaning, lubricating and oiling |
| Engine is tending to stop with the throttle fully open | |
| -Carburettor dirty | -Clean carburettor in solvent and blow dry / clean jet and dry with air jet |
| -Air-fuel ratio not in order | -WARING ENGINE DEMAGE THREATENS! Read the color of the spark plug, if it's white its to lean. The engine can overheating. |
| Engine is tending to stop the slow running | |
| - Incorrect setting of idle adjustment screw | -Screw in the large screw on the right side of the carburettor (idle adjustment screw) into the carburettor |
| - Adjust accelerator cable | -If the adjustment of the idle adjustment screw doesn't help you have to check the mixture at slow running setting screw(slotted-head screw) |
| -Blade valve doesn't close | -Replace |
| Engine misfiring when the vehicle is running up hill or picking up | |
| -Air filter clogged or dirty | -Air filter: Remove and clean |
| -Defective spark plug | -Decoke, or replace it with a NGK B8ES spark plug |
| -Excess of carbon deposits on cylinder ports and combustion chamber | -Decoke with a piece of hardwood. After cleaning put a bit of oil into the cylinder before assembly. |
| Breaking system | |
| -Poor breaking | -Adjust the breaking screws. If it's doesn't work:hardened brake linings have to be renewed or Bowden cable is defective - worn brake pads. - Disc brake: brake caliper disassembly - Disc brake: Air inside brake system |
| -Cables rusted in their sheaths | -Lubricate or substitute -After working: Check if you jammed the sheaths under a cowling |
| Steering and suspensions controls | |
| -Excessive play | -Bearing not properly tightened |
| -Steering proves hard | -Check upper ring nut tightening / check ball races |
| -Excessive play (another possibility) | -If the front suspension is noisy, check, according to the case, by replacing damaged parts like front damper efficiency or ball bearing conditions or locking of the wheel hub nut |
| -Suspension noisy | -lubricate with grease between damper and outer tube |
| Disc brake (Sfera RST and others) | |
| -leaking brake system / defective | - Air inside brake system / too little or old brake fluid / worn brake pistons |
| -Breake is blocking after release lever | - defective master brake cylinder, defective brake caliper ,brake fluid reservoir plugged, bleed brakes |
| -Too long stopping distance | -Air in the brake system or break fluid is under minimum in brake fluid reservoir |
| electrical installation | |
| -Light to dark or entirely of | -Check illuminant (front 35/35W) / Check voltage regulator |
| -Turn signal is not working without engine is running | -Battery empty or blown fuse |
| -Fuel gauge is not working | -Check tank sensor and cable [LINK] |
| -Problems with battery | -Battery maintenance[LINK] |
| -Speedometer needle does not move | -Defective speedometer cable [LINK] |
