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2003 Honda Wave 100, is hard to start, idles rough, and when throttle applied it stalls at about 1500rpm.

 

Water in the fuel, bad spark? I am a semi-qualified Shade Tree Mechanic, and would appreciate any thoughts before I tear into it.

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My first thoughts?

 

Check the spark plug.

Check air filter if here is still one.

Buy a bottle of fuel system cleaner bung some into the tank and let it idle for 15mins or more then let it stand for a few hours. Then try again. 

 

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Replace the spark plug and the spark plug cap.

 

    Remove the plastic shi_e and check if there's a vacuum controlled valve that lets fuel through when the engine is turning.

 

Check if the fuel contains water, if so let all out. 

 

     Take brake cleaner or starter fluid and spray it around the carb. If the RPM's got up, you've got a vacuum leak.

 

  Anyway time to overhaul the carb, it's an easy job. 

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Just now, teacherclaire said:

Replace the spark plug and the spark plug cap.

 

    Remove the plastic shi_e and check if there's a vacuum controlled valve that lets fuel through when the engine is turning. ( Just follow the fuel line)

 

Check if the fuel contains water, if so let all out. 

 

     Take brake cleaner or starter fluid and spray it around the carb. If the RPM's got up, you've got a vacuum leak.

 

  Anyway time to overhaul the carb, it's an easy job. 

 

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Some villages water down their fuel, relying on the ethanol content to hide the scam.

Easiest way to clear water from a tank is to add methylated spirits, to restore the fuel to a single liquid phase.

As other posters have suggested, drain the fuel is another option. However, rinsing the system with methylated spirits will work better, as separated water tends to stick to any rubber or plastic.

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When did you have the last service on this bike? Do you use this bike frequently?

https://www.manualslib.com/manual/826702/Honda-Wave-110i.html

Consider (check, clean or change):
* Spark plug,
* Air filter,
* Carburetor.

Then, retest

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Hard to start/rough running etc. when hot or cold?

 

If when hot >> Choke stuck open?

 

Edited by MartinL
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Excellent information, much thanks to all. I'll start with the easy stuff (fuel system cleaner, spark), and go from there. I'll let you know what I find.

Edited by Shot
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37 minutes ago, Fab5BKK said:

When did you have the last service on this bike? Do you use this bike frequently?

https://www.manualslib.com/manual/826702/Honda-Wave-110i.html

Consider (check, clean or change):
* Spark plug,
* Air filter,
* Carburetor.

Then, retest

I picked this bike up a few months ago for a 3k Baht, it ran fine at the time, but I don't know the history. It's old, ugly, rusty, plastic is cracked, but I love it. 

Edited by Shot
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I have a 2001 Dream which has the same engine and carb.  Owned it from new.

 

Nine times out of ten if there is a problem it is dirt or contaminants in the fuel.

 

Remove carb.  Strip carb and clean.  Make sure jets are not blocked.  Put it back together.  Check fuel filter and replace if necessary.

 

 

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51 minutes ago, teacherclaire said:

+ spark plug and eventually vacuum leak(s).

Well his symptoms are typically Carb. 

It wouldn't start and idle if it were plug. 

The idle jet is the problem, so clean the Carb,  change fuel filter if there is one. 

if it's a SV Carb a split diaphragm can cause much same. 

 

Edited by Kwasaki
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51 minutes ago, Kwasaki said:

Well his symptoms are typically Carb. 

It wouldn't start and idle if it were plug. 

The idle jet is the problem, so clean the Carb,  change fuel filter if there is one. 

if it's a SV Carb a split diaphragm can cause much same. 

 

Just cleaning doesn't help much. After such a long time, he should rebuild the carb.

It's not a Constant Velocity carb, it's an ordinary carb and a Kit pretty cheap.

 

65 baht for a kit if it's a Keihin.

https://www.lazada.co.th/products/honda-wave100-wave100r-wave100s-carburetor-repair-kit-i1190116895.html

   

 

   

Honda Wave 100 cc carb.jpg

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Good call, I commented on OP post symptoms as that's what I would say is the problem.

7 year Carb not old, just a clean and as you say a Carb refurbish kit.

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