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I just bought a 2002 ET4 150 with a little bit over 2100 miles. The last owner quit taking to the shop and sold it to my begging price. She said it had not run for 2 years.My problem is, I could not get this scoot started. Been trying for days. I found a blown fuse at the battery compartment and replaced it. started it with the charger hooked up and blow the fuse again. the engine will turn but no combustion. Checked the spark plug, I could see spark but no blue spark like I wanted. Tried to start bu spraying starter fluid inside the air filter and all i got was a fire started by a backfire. I'll try to order new coil and plug. I need help tracing this or I'll have to go to the scooter shops. I like to work this out by myself if I can like an avid vespa rider. This is a pretty red Vespa and I hate to see it not running even on winter season. Please help

Verge
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Coil is probably not your problem. You don't mention draining the fuel tank and replacing it with fresh fuel. You likely will need to clean the carb. Check your fuel tap and vacuum hose that operates the fuel tap.
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So does it turn over on the starter but not fire up?
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It turns but not firing. The fuse on the other hand keeps burning. I installed 7.5 amps. The same one i took off. I did not put 15 amps on it, i might fry something else.
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what is the fuse for that is burning out? When is it burning out? What stops working when it burns out?

John
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One of the fuse at the battery compartment. Its 7.5 amps. Everything else works, the starter cranks but no combustion. I'm new to vespas I just got the fever last year. I have not drain and put new fuel on it yet, I only tried to spray it with ether inside the filter area to see if it would fire. All I got is back fire and fire started from the residue of overspray. I will never do that again. Pretty scary to see your engine on fire on the vespa I just bought.
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Will this fuse keep me from getting a combustion?
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Are you saying that with the fuse blown the starter still cranks the engine?

Does the brake light illuminate when you pull the brake levers?

I'm thinking that the backfire is being cause by a build up of gas/air mixture from the carb and that it isn't igniting possibly because the spark plug is fouled up (has the scooter been sat a long time unused and then you've tried to start it many times flooding the engine and fouling the plug).

Have you removed the spark plug and checked the condition of it - it may need a good clean up or replacing. The spark plug on the ET4 is quite hard to access so a lot of people ignore the condition of it.
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I took the spark plug out and it's clean. Yes all the lights work. I already burned two 7.5 fuses. The starter turns the engine like a champ, even with burn fuse. I need to trace where that wire go and see if it's grounded. I just thought somebody had the same effect and fixed it. Still, the combustion is not happening. I was wondering what I need to do or replace next.


I thank you all for feedbacks. This is a great place. I've been reading here for a while before I bought my first vespa. Bunch of great fun people getting me off the stress of the world.


Thanks
Verge
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I checked the spark of the plug while its out and I saw spark but not strong blue spark. I already checked the carbs and it's clean and spraying. Still holding on before I take it to the shop
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vippinoy wrote:
.......and I saw spark but not strong blue spark.......
What colour was the tip of the spark plug...and was it oily/wet/smelt of fuel?
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It was clean and dry and thin black carbon in the middle. I ordered new plug and I'll check it again. I'll look for where the wires end where the fuses is burning. I'm thinking it should be 15 amps on the fuse but I'll check the electrical drawings.
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What fuse number is it. Something must not be working when blown. Bad gas would cause a no start.

John
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It's the fuse near the left side of battery. I thought ether would make it fire, even with bad gas, but no ignition. I will drain the tank next and change the spark plug/cap/wire and anything else i could think of. I have to wait for parts since we have no vespa parts store in va beach.
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Are the fuse on the battery side supposed to be 15 amps? I took out 7.5 amps and we have 2 version of amperage on the 2 drawings for et4 on this site. Can you tell me which one go to a 2002 et4? I'm a little confused
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Verge, I would locate the stator harness and regulator. That seems to be different from the two diagrams. One is clearly a 3 phase stator with a five pin regulator and the other depends weather it grounds on it mounting 4 or 5 but does not look like a 3 phase system.

John
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I will try to check it this weekend. I ordered everything except the stator and cdi. wish me luck. Still want to try to fix this myself before i call a scooter mech. thanks
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This is the fuse that keeps burning up. orange and grey wire attached to it. just installed this one and as soon as I turned the key it burns.

Seems like my pix will not upload.
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tvnacman wrote:
Verge, I would locate the stator harness and regulator. That seems to be different from the two diagrams. One is clearly a 3 phase stator with a five pin regulator and the other depends weather it grounds on it mounting 4 or 5 but does not look like a 3 phase system.

John
did you do above?
I don't work on vespas for a living I don't know all the fine details. Some on here might.

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Did you find the problem? I have recentely got an et4 150cc from someone that couldn't fix it, who originally got it from someone else that couldn't fix it. All the simptoms are like yours, and it seems to be electrical.
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vippinoy wrote:
... I only tried to spray it with ether inside the filter area to see if it would fire. All I got is back fire and fire started from the residue of overspray. I will never do that again. Pretty scary to see your engine on fire on the vespa I just bought.
I once set an ex-girlfriend's son's dirtbike on fire doing that, so I feel your pain. You have two ET4s, and it sounds like too many hands have had a go at this one. First, visually compare all the connections and fittings to the one that runs. See if some enthusiastic person conected everything they possibly could, or made some connections that aren't on the other one. Then, just start troubleshooting at the plug and work your way back.
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Motovista wrote:
vippinoy wrote:
... I only tried to spray it with ether inside the filter area to see if it would fire. All I got is back fire and fire started from the residue of overspray. I will never do that again. Pretty scary to see your engine on fire on the vespa I just bought.
I once set an ex-girlfriend's son's dirtbike on fire doing that, so I feel your pain. You have two ET4s, and it sounds like too many hands have had a go at this one. First, visually compare all the connections and fittings to the one that runs. See if some enthusiastic person conected everything they possibly could, or made some connections that aren't on the other one. Then, just start troubleshooting at the plug and work your way back.
My initial thought was spark plug/ electrical...maybe the stator?
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waiting
still waiting for my new spark plug and already drained the old fuel. I'll be adding hgh test fuel. still holding out for the stator for last. I have new plug wre and regulator ready for installaton. I found a bare metal that got shorted by being pinched by the rear view mrror threads. havent tried to install a new fuse yet but maybe this weekend. the wire is purple and from the high/low beam button. I cut the damage part reconnect it with crimp connector with heatshrink. hope that will fix it.
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Finally got it to start. After replacing the fuse, I also replaced the spark plug wire, cap, regulator, fuel cock, and fresh fuel. I really think the grounded wire kept it from starting.

I thank you all for the input on this problem. I will not lnow where to start without this group. Time to clean this bike for spring and enoy it. Ill take pix in a few days.
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now I would put all the old parts one at a time till it won't start again. I would not put the bad gas back in.

John
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Thanks John. I need to put high test fuel to clean the fuel tracts. I'll try and register it monday. Seems like the high low beam switch wiring short burned the fuse and kept it from starting. The last owner also broke the signal switch. Had to repair the plastic wheree the screw goes to.
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did you ever figure out the correct diagram? if you do I would print it for future reference.

John
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I stayed with 7.5 amps. I thinks this is right and only burning because of grounded wire.
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