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I've noticed the past couple of weeks that after I ride for about 15 minutes, from time to time it won't immediately start again. Part of the riding has been near full throttle on a highway so I'm thinking a heat issue? It's never happened to a cold engine. Today it was even a 15 minute break and the temp is only mid 70's and I couldn't get it to start. It's cranking like normal but then it dies. I'm not a mechanic but is there anything I can easily check? It had it's last service just a few months ago so everything is up to date maintenance wise
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What's the milage and have the valves ever been adjusted?
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It's at 16,000 miles. Unless valve adjustments are part of the standard interval services, they have not been adjusted.
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2013 Vespa LX150ie, 1968 Vespa Sprint 150
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This could be related to the awful EVAP system in that bike. The EVAP creates a kind of vapor lock when the engine gets hot. It's awful and can get worse over time. Once it's hot, it will stop turning over for a little bit.

FAQ: Why does my GTS groan/moan/moo or fart when off?

Continuous attempts to turn it over should result in it starting but it can take a while. It appears you are in California and this horrible, poorly designed system cannot be removed (legally).
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One part of me hopes you are right because there is nothing to fix. The other part hopes the EVAP is not the problem because it won't be fixed.
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sjs1967 wrote:
It's at 16,000 miles. Unless valve adjustments are part of the standard interval services, they have not been adjusted.
Part of a standard service is tough to answer. A valve check is usually kind of expensive and most people don't do it. Valve intervals looks to be 3750 and 15k miles for the Lx150 based on the wiki here. Do you have the old service records to see if it was done?
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Paddlenround wrote:
This could be related to the awful EVAP system in that bike. The EVAP creates a kind of vapor lock when the engine gets hot. It's awful and can get worse over time. Once it's hot, it will stop turning over for a little bit.

FAQ: Why does my GTS groan/moan/moo or fart when off?

Continuous attempts to turn it over should result in it starting but it can take a while. It appears you are in California and this horrible, poorly designed system cannot be removed (legally).
Next time, crack the fuel cap. If there's a big whoosh, you found the answer.
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I'll have to check the service records when I get home, thanks.

I'll try the same ride again tomorrow to see what happens and then crack the fuel cap. [/quote]
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This does sound like valves, especially if you've been running an air cooled bike flat out for miles on end.
Or the air/fuel screw in the carburetor is out of adjustment. Seasonal changes in the fuel blend in California can affect carb. scooters more than EFI bikes, and it seems like it's about that time.
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/\ /\ THIS.../\ /\
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Stromrider wrote:
/\ /\ THIS.../\ /\
Please note that this is a fuel injected version. So...put a little seafoam in it to get started.
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Paddlenround wrote:
Stromrider wrote:
/\ /\ THIS.../\ /\
Please note that this is a fuel injected version. So...put a little seafoam in it to get started.
If it is running smooth at idle I don't see what sea foam will do to help.
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sjs1967 wrote:
I'll have to check the service records when I get home, thanks.

I'll try the same ride again tomorrow to see what happens and then crack the fuel cap.
[/quote]
What happened? 8)
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Molto Verboso
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Fuel pump if this scoot' is of the vintage that Vespa had pump problems...
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WEB-Tech wrote:
Paddlenround wrote:
Stromrider wrote:
/\ /\ THIS.../\ /\
Please note that this is a fuel injected version. So...put a little seafoam in it to get started.
If it is running smooth at idle I don't see what sea foam will do to help.
Noting that someone said that it might be the valves...putting in seafoam can help clear out the deposits that build up. Personally, I think it's the EVAP but seafoam is good at clearing out gunk and if there is any, running that through the fuel system won't hurt a thing.
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My take - it may or may not be the valves, but without checking them you could be chasing your tail for ages and spending money on parts and labour for no benefit.
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If they were never checked with 16k miles, it's about time anyway.
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Thanks everyone for weighing in. I can't find my last service receipt so I'll have to call the mechanic.
Opening the gas camp yielded nothing. The problem happened Friday on my way home from work on an 85 degree day. I wanted to stop and pick up dinner and just hoped it would start back up. It didn't, so I spent a few minutes in the restaurant parking lot. I found some shade and took out the pet carrier to see if it would help cooling. That did seem to help limit the down time. I was worried a bit though as a few times I tried to start it back up, all I heard was a whirring sound. Once it did start back after leaving it sit for a few minutes, it sounded great again.
This morning I figured there were not going to be any stops on my commute so I decided to ride. It was about 50 degrees and I while on the freeway I remembered I had to go by the post office. I drove at least 55 the whole way. The post office is near the end of the commute and my bike was only off for a minute or two. It started right up.
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When this has happened, did you hear the fuel pump prime when you first switched on, before trying to start?
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Usually I can hear it. This was the first time some of the attempts to start it resulted in no fuel pump sound
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I think you found your problem. This isn't a valve issue.
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sjs1967 wrote:
Usually I can hear it. This was the first time some of the attempts to start it resulted in no fuel pump sound
Hearing the fuel pump when trying to start is irrelevant (the starter's too loud to hear it anyway). It's hearing it prime when you first switch on that's important. If you don't hear that, your fuel pump may have temporarily seized from the heat. 2009/2010 Vespas had a recall for this problem.

Another reason can be that the 'ignition loads relay' has decided to play up. That's another known problem.
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