Modern Vespa

Vespa gts300 not starting I checked it. It has Fuel, Spark, Compression and key detected. I removed evap system checked the fuel pump and fuel injectors it works, I checked piston still amazing new, I adjusted the valves, I did the timing at TDC, I replaced air filter and oil filter

Is it turning over, but not starting?

Battery voltage?

I'm not sure to be honestly I never checked I have a lx150 as well I used that batterie because the gts battery died while trying to start it and yeah it cracks over turns on for less than 1 second then dies and won't turn on again

You might check to make sure the battery is good/fully charged. It starts the 150?

There have been some starter problem threads lately including relays.

I thought maybe the 150 battery was smaller, but they may be the same.

Yeah it starts up the 150 quick when I installed it into the 300 it cranks for about 5 minutes then slowly starts to die down until it can't turn over anymore

You've run both batteries down while trying to start the GTS. You're certainly going to have to recharge them before attempting to start again. The batteries may be old enough that they won't hold a charge anymore and will have to be replaced.

Oft times a poor battery may seem to function well but just doesn't have enough power to start. OTOH, if you can crank for 5 minutes, that sounds like a fair amount of juice...and BTW, no point in cranking continuously for long....give it some bursts, 15 seconds or so and take a break.

Still possible it's a bad battery....can't recall the difference but the 150 and GTS aren't the same batteries. You're going to need a new one for the GTS anyway....you've checked most of the other variables, so my bet's on the battery.

Can you describe in more detail how this problem popped up?
How old is your GTS? Do you drive it daily and now all of a sudden it does not start? Or has it been stored for winter and now you use it for the first time in months?
That kind of background. More detail can bring better advice.

Saw same issue on another scooter forum....went through most of the maintenance book.....
It was flooded.

O.S.

I never got it running I had purchased it from someone off of Facebook marketplace and the man said that he had it stored for a few years and it was his daily driver I got it and the same day it started up for 5 seconds but then died ever since that day I could never get it on it's a 2010 GTS300 IE I tried everything I was forced to make an appointment next week for drop off it could be anything at this point but I checked everything and it was all good I have images as well

I assume you put fresh gas in it?

Yeah I had drained out the old gas I did a small run through on what I should do and replace but I flushed out all gas and put a gallon of 93 [/img]

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It looks clean enough... I wouldn't have taken the head off, but...

You say the fuel pump and injector are working.

I would keep the battery charged, or get a new battery, and a new spark plug, then keep cranking a while and see if it starts.

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I got a new spark plug and by the time I took it out it was complete black

We may be beginning to get somewhere now.

Are you sure the spark was good and strong?

I'm not sure if it was strong I just seen the spark because I used a screw driver and put it in the spark plug cap placed it against the metal frame in the body and I seen spark I can send a video now

That blue dot is the spark it won't let me send the video [/img]

Maybe it was flooded, as OldSchooot says. I'd clean up the plug and try cranking it again with a good battery.

Yeah honestly it might be do you know how I can fix that because it has a ECU for a throttle body not the same as my old moped with a carburetor where I can just remove spray carb cleaned and I was good

I dunno. My fuel injected scooters have always just started after sitting over the winter. Sometimes it takes a few good cranks to get them to start, though. Maybe we need to get a GTS specialist in here.

Everything looks new. How long has it been sitting and how many miles does it have on it? Given that pristine engine, I would NOT have removed the valve cover or checked the valve clearances, but I'm damn impressed by your initiative - well done. Have you checked out the high tension (HT) wire from the HT coil (near the battery compartment) to the spark plug? I've found that if the HT connection is not tight (or if the HT wire is damaged), you'll get lots of "turn over", but no start... That's what I'd look at next. Good luck. Let us know how it goes.

Oh yeah - one more thing - Once you get it running (or even before!), make sure you change all the oil (engine/transmission), brake fluid, and coolant, especially if it's been sitting for a while and the previous owner didn't give you the service records. General rules of thumb for maintenance: engine oil should be changed every year or 6200 miles (which ever comes first) & and transmission oil, brake fluid, and coolant should be changed every two(ish) years (regardless of mileage).

Oh wow I haven't checked that at all to be honest and thank you man 😎😎 I love working with vespas the bike has 6149 miles

Let us know how it works out. Also, did you clean your piston head? It looks brand new - can you confirm six thousand (6000+) miles?

Yeah 😌 I took a picture after I cleaned it was a little black in certain areas but I cleaned it up good and I cleaned the valves as well

Any "check engine" codes from the ECU? Nothing to indicate a reason for a fouled plug, lambda sensor ok, etc?

Looks great! Thanks for letting me know you cleaned it up - I feel much better about my much dirtier piston (at 2600 miles).

Yes when I turn the key the check engine light comes on then off but back on when I'm cranking it over I don't have the code reader to tell what it could be

I think it blinks, rather than steady on, if there's something wrong. I'm not sure about that; we're getting a little beyond my experience with fuel injection. For me, it always "just works".

The immobilizer reads it blinks then turns off it reads the key I seen videos from robot from scooter west and that all checks out good the check engine light comes on when I'm trying to crank the bike over

I compared this to my 2019 Primavera 150. The Engine light comes on for about 2 seconds when the key is turned on. Then it goes out and stays out. It does not come on when the starter is cranking.

Now you say "it started up for 5 seconds but then died".
Do you mean the starter motor cranked the engine for 5 seconds? Or did the engine really fire up for 5 seconds?

It is the picture of your piston.

Did you clean it?

Somebody did because I do not think you will find any engine on earth that has that clean a piston after 6000 miles.

Read above - yes he cleaned it.

Are you twisting the throttle while cranking? If so, don't. It is FI and all you need to do is have the key on, brake lever pulled and push the start button.