But as soon as I gave it any gas, it would die again. The carburettor had been on the way out anyway but for some reason the heavy rains had finished it off no part of the bike had been submerged, though. Any idea why this would have been? A new carburettor sorted everything out and now it starts on the first press of the starter most days.
Thanks, everyone lots of great advice. I just changed the battery and got my spark plug cleaned not replaced. I noticed the mechanic put some grease one it but not sure if he put enough. But it still does not start properly. It is both equally difficult to start with kick and button. I think I will do that, take it to a mechanic and ask him to waterproof it. The funny think is that even when I keep it sheltered during those rainy days it still does this.
Or it could be the points are dirty May not evn be the electricals but something is sluggish or blocked or worn in that engine that the rain brings out more. I would take it to Jeremy or someone you could trust… I would be worried that otehr mechanics are just shoot gunning the problem… they change this then this and after something else until they find the problem. Low-quality parts that is, poorly-insulated wires are a pretty common theme here. I used to have a Honda C50 step-thru.
Step 3 - Ignition coil in another important part of ignition system. Ignition coil is what provide very high voltage to spark plug. Step 4 - CDI unit is the brain of ignition system in most low end motor scooters. Here is how to spot and repair a CDI Unit. Step 7 - Magnetic coil in engine, create current for charging battery and also for lights. This is better than case one, because in this case the engine is working.
Engine will shut off because of many reasons. Following are some step by step guide to figure out its problem. Step 1 - In this case also, remove spark plug from engine and inspect it. Make sure that spark is white in color, It is hitting at the center of spark plug center electrode. Clean or replace it. It should not be too dark in color. Step 3 - Clean and tune carburetor, dirty or clogged carburetor is one of the main reasons of this problem. Step 4 - Recharge or replace battery if dead. Try to jump start it with other battery.
Step 7 - Check for Engine spark timing this will also cause compression loss problems Very low chance of this happening. Loss of compression from engine can happen because of leak in valves, broken parts, defective engine head gasket, problem with timing belt etc.
Or there is a hole in piston. It's the only electrical powered component attached to the carburetor, so it's usually not hard to spot.
If you have a voltmeter you can measure the resistance across the leads of the choke. It should be somewhere in the region of around 10 or 20 ohms. If it's an open circuit, it's burned out and will need to be replaced. If it seems to be OK it may be stuck, or the wiring to it may have a problem. Check to see that it's getting voltage.
It's also possible that there is a problem with the carburetor and if so you may need to remove it and clean it out. If the scooter has been sitting for a few months with gas in the carburetor, the gas may have evaporated and left a sticky "gum" behind that will prevent the carburetor from working properly and which must be removed. If the automatic choke is OK, the starter cranks the engine, there's gas and there's a spark then there may be an engine problem.
You need to check the cylinder compression. You need a compression tester to do this. It screws in instead of the spark plug and measures cylinder pressure. When you crank the engine you should see a reading of around psi or more. If it's psi or less there's likely and engine problem bad valve, bad piston, failed piston rings which will need the engine taken apart to find.
Probably the most common problems are a dead battery or carburetor problems due to bad adjustment or build up of gummy deposits. Carburetor problems usually come on slowly though. If a scooter is OK one day and refuses to start the next day, I'd first suspect an electrical problem. Scooter Focus All about gas powered motor scooters
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