Diesel in my Petrol Vespa!!
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Member
LX 125
Joined: 27 Nov 2014
Posts: 27
Location: London
Sun Nov 15, 2020 9:27 pm quote
Hi All, so a while ago, I was in a rush and haphazardly put DIESEL in my Vespa LX...

After esearch I read that, as long as I remove the Diesel oil it should be ok and wouldn't ruin anything.

So I removed the Diesel oil and replaced with Unleaded petrol. The bike would not start up so I then replaced the Spark plug and removed the Carb to clean it. Upon doing so my intake manifold tore off with the Carburetor!!

So now I had to wait to get a replacement, and then carry on! I've now received it after 2 weeks of my bike sitting

And now it still won't start and after a while, stops completely, I've added a vid, if that helps so maybe someone can guide me!

Any help would be appreciated, thanks!

Vespa_LX_Not_working_no web optimization.mp4.zip
 Description:
This is how my engine/bike sounds when i attempt to start it!

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 Filename:  Vespa_LX_Not_working_no web optimization.mp4.zip
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Molto Verboso
Primavera ET3 & PX150 & GTS 300
Joined: 05 Apr 2009
Posts: 1472
Location: Berlin
Sun Nov 15, 2020 10:46 pm quote
When did you notice that you put diesel in it? Before you attempted to start the engine?
Ossessionato
LXV 150 3v ie. Midnight Blue (Sold)
Joined: 06 Dec 2010
Posts: 3448
Location: Kingdom of Lanna
Sun Nov 15, 2020 11:03 pm quote
There is probably some residual diesel still in the system. Did you drain out some petrol while you had the carburettor off? To clean out the line?

Are you 100% sure the spark plug cap is secured?

Last resort go to Halfords and get some Holts Cold Start 400ml. Spray into inlet as instructions on the can. If it fires up but stops you'll have to clean out the residual diesel again from the carburettor, and try again.

If it doesn't fire up. Clean the spark plug again.
Member
LX 125
Joined: 27 Nov 2014
Posts: 27
Location: London
Mon Nov 16, 2020 1:41 am quote
Hi Der Blechfahrer, Thanks for replying.

Unfortunately I didn't realise at all and rode off and only noticed when the bike began sputtering and came to a halt, which i then put two and tow together once i went online, as the bike was fine beforehand and had never done this before!
Member
LX 125
Joined: 27 Nov 2014
Posts: 27
Location: London
Mon Nov 16, 2020 1:47 am quote
Hey waspmike, thanks for your response!

The way I drained the diesel was by siphoning it from the actual tank. Once i removed the carb and cleaned it some fuel did leak out from it.

How would I go about cleaning out the line with the carb off?

I'll check the spark plug on my break and also go Halfords at some point today, as I do need some of that to have around to be honest.

I'll try what you said and chime back in.

Thanks everyone, really appreciate it... bloody heck that was a quick response!
Ossessionato
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
Joined: 21 Jul 2007
Posts: 4357
Location: Latina (Italy)
Mon Nov 16, 2020 2:51 am quote
-https://www.youtube.com/watch?v=Zt-scqiSV5U-

Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1120
Location: Toronto
Mon Nov 16, 2020 3:14 am quote
Delllboyyy wrote:
The way I drained the diesel was by siphoning it from the actual tank. Once i removed the carb and cleaned it some fuel did leak out from it.

How would I go about cleaning out the line with the carb off?
I don't think siphoning will get out all the fuel. You will likely need to disconnect the petcock and drain fuel entirely from that low point.

With the carb off and petcock / fuel line disconnected, you can also make sure the fuel line is clear.
Member
LX 125
Joined: 27 Nov 2014
Posts: 27
Location: London
Mon Nov 16, 2020 4:13 am quote
Hi Berto,

will i need any special tools to remove the petcock? And are there any vids/tips in order to do so?

Thanks in advance everyone!
Member
LX 125
Joined: 27 Nov 2014
Posts: 27
Location: London
Mon Nov 16, 2020 4:15 am quote
That looks AMAZING!!... Not sure where the guy will sit, comfortably lol, but it looks the dogs b_llocks nonetheless!! Haha
Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1120
Location: Toronto
Mon Nov 16, 2020 4:38 am quote
Delllboyyy wrote:
Hi Berto,

will i need any special tools to remove the petcock? And are there any vids/tips in order to do so?

Thanks in advance everyone!
No special tools.

Here are a couple of threads that might be useful:
Replacing petcock
2008 Vespa LX 150 Fuel petcock replacement

And a video from ScooterWest that looks like it shows what's going on (I didn't watch it, but the thumbnail shows Robot holding the petcock):
https://www.youtube.com/watch?v=xbHgOOLDUvA
Ossessionato
1991 T5 Pole Position, 2008 LXS 125, 2013 Peugeot Metropolis RS
Joined: 06 May 2011
Posts: 3420
Location: Staffordshire UK
Mon Nov 16, 2020 4:41 am quote
sorry, got no solution to add, but i'm wondering does the diesel nozzle fit in the throat of the LX filler? Diesel nozzles are bigger (won't fit in my petrol car)?

If it does, it's a poor design
Hooked
S150, Beo 500ie
Joined: 14 Aug 2019
Posts: 398
Location: Bermuda
Mon Nov 16, 2020 8:45 am quote
I would clean the carb again. Remove the float bowl (four screws), spritz everything out with carb cleaner, pull off the fuel supply hose to the carb, and put a vacuum on the petcock vacuum hose so the tank re-drains through the carb fuel supply hose. Reconnect the hose to the carb. Then put a liter or so of fuel in the tank. That should be enough to dilute whatever tiny amount of diesel remains in the system. It'll be smoky for a few seconds once it starts, but it should dissipate quickly.
Veni, Vidi, Posti
Lx 50 4T, GTS 250, S 150 (Missing in KS), Something Chinese, GT 200 (sold)
Joined: 21 Feb 2011
Posts: 9040
Location: KS USA
Mon Nov 16, 2020 2:19 pm quote
Years ago I put diesel in my car by accident. It cost me about half a grand to get it fixed.
Hooked
Sportcity 350ie
Joined: 08 Nov 2016
Posts: 107
Location: Zagreb/Croatia/EU
Mon Nov 16, 2020 10:37 pm quote
Diesel couldn't make any damage to gasoline carb engines. Draining diesel out and filling full tank with gasoline, then draining your carb on lower point screw was all what you should to do. After few attempts (10~15) engine should start. Would smoking from beginning but after half minute all.should work like before.
Try to find issue in things what you "fixing" later- spark plug, spark cap, carb.
Check do you get sparks (hold spark to negative/frame/head with cap on and try to start in dark - you should see white sparks.
If sparks OK then put 1ccl of petrol inside piston chamber, install spark plug and cap and try to start...
Hooked
Sportcity 350ie
Joined: 08 Nov 2016
Posts: 107
Location: Zagreb/Croatia/EU
Tue Nov 17, 2020 12:17 am quote
***normally your engine is 2T so you have to use proper mixture gasoline+2T oil!
Just to avoid some posible misunderstanding
Ossessionato
LXV 150 3v ie. Midnight Blue (Sold)
Joined: 06 Dec 2010
Posts: 3448
Location: Kingdom of Lanna
Tue Nov 17, 2020 12:27 am quote
Max6200 wrote:
Years ago I put diesel in my car by accident. It cost me about half a grand to get it fixed.
"Filled the Escort with diesel! She died?"
Ossessionato
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
Joined: 21 Jul 2007
Posts: 4357
Location: Latina (Italy)
Tue Nov 17, 2020 3:00 am quote
balki wrote:
***normally your engine is 2T so you have to use proper mixture gasoline+2T oil!
Just to avoid some posible misunderstanding
It's an LX 125 and I think it's a 4-stroke engine.
Hooked
Sportcity 350ie
Joined: 08 Nov 2016
Posts: 107
Location: Zagreb/Croatia/EU
Tue Nov 17, 2020 7:04 am quote
Sorry. In your 1st post you just told Vespa LX so I though it's 50ccm 2T.
Veni, Vidi, Posti
Lx 50 4T, GTS 250, S 150 (Missing in KS), Something Chinese, GT 200 (sold)
Joined: 21 Feb 2011
Posts: 9040
Location: KS USA
Tue Nov 17, 2020 7:20 am quote
balki wrote:
Sorry. In your 1st post you just told Vespa LX so I though it's 50ccm 2T.
LX 50's also come in 4 t's.
Member
LX 125
Joined: 27 Nov 2014
Posts: 27
Location: London
Tue Nov 17, 2020 10:34 am quote
Thanks for ALL the help guys... I didn't get a chance to get to Halfords yesterday as the lil'un is under the weather. So I prob won't be able to sort it tonight either if the missus has her way Haha

Haven't got work tomorrow, so i'll sort it then, wish me luck!

But, seriously, I can't thank everyone enough on here for reaching out!

Oh, I used to have a 50CC but I swapped it out for a 125 4T

Also... I see most ppl on here are from, US... Is there a strong Vespa Community where you are, I thought there'd be something like that here in London, but not really, even fellow Vespa Riders in passing don't really give off that vibe, strange!

But I will keep you updated once I start tomorrow, cheers.
Member
LX 125
Joined: 27 Nov 2014
Posts: 27
Location: London
Wed Nov 18, 2020 9:46 am quote
Hi everyone,

So I finally managed to try it all out but it still won't start. I drained the tank via the petcock and also, put a vacuum on the petcock vacuum hose, cleaned the carb, and sprayed Holt Cold start in the intake manifold. The Bike start once and then stopped, now I when I try and start it I just get a noise and no starting or revving at all just a whirring sound like in the vid.

The only thing I haven't done is put 1ccl petrol in the Piston chamber as i'm not sure where this is exactly!

Also, when you say try 10-15 times and it should start, should i still be trying to start the engine if all i'm getting is a whirring sound??

Thanks guys!
Veni, Vidi, Posti
GTS 300ABS, Buddy 125, Buddy Kick 125
Joined: 29 Dec 2007
Posts: 11542
Location: Oregon City, OR
Wed Nov 18, 2020 10:13 am quote
Delllboyyy wrote:
The only thing I haven't done is put 1ccl petrol in the Piston chamber as i'm not sure where this is exactly!
When you remove the spark plug, you are looking into the cylinder above the piston. However, if starter fluid didn't do the job, I don't think a small amount of petrol in the cylinder would be any more effective.
Hooked
Sportcity 350ie
Joined: 08 Nov 2016
Posts: 107
Location: Zagreb/Croatia/EU
Wed Nov 18, 2020 10:45 am quote
Cold start spray in intake have same result like my advice with small amount of gasoline in ignition chamber.
You told you try all so you have white sparks on spark plug? If yes then focus to fuel/carb issue.
Goto youtube and search scooter spark plug check
Veni, Vidi, Posti
2007 Vespa LX 190, 2011 LXV150ie
Joined: 26 Oct 2008
Posts: 8676
Location: Annapolis, MD, USA
Wed Nov 18, 2020 1:39 pm quote
Delllboyyy wrote:
Hi everyone,

So I finally managed to try it all out but it still won't start. I drained the tank via the petcock and also, put a vacuum on the petcock vacuum hose, cleaned the carb, and sprayed Holt Cold start in the intake manifold. The Bike start once and then stopped, now I when I try and start it I just get a noise and no starting or revving at all just a whirring sound like in the vid.

The only thing I haven't done is put 1ccl petrol in the Piston chamber as i'm not sure where this is exactly!

Also, when you say try 10-15 times and it should start, should i still be trying to start the engine if all i'm getting is a whirring sound??

Thanks guys!
The whirring sound at the end of the video after the engine stops cranking is the starter motor turning over without the Bendix gear engaged.

If all you are hearing when you try to start it now is that whirring sound, then it likely means your battery is too weak to engage the Bendix gear and crank the engine. The Bendix gear is the little clutch on the starter motor shaft that engages the crankshaft to turn the engine over. It relies on sufficient starter motor speed to do so, and won't engage if the battery won't turn the motor fast enough.
Ossessionato
LXV 150 3v ie. Midnight Blue (Sold)
Joined: 06 Dec 2010
Posts: 3448
Location: Kingdom of Lanna
Wed Nov 18, 2020 4:35 pm quote
Delllboyyy wrote:
The Bike start once and then stopped,
So the ignition system /spark plug is OK. More carb. cleaning required and take the battery to be re-charged or connect it to a car using jumper leads.

Persevere.
Hooked
Primavera 150
Joined: 17 Sep 2017
Posts: 466
Location: Long Beach, CA
Wed Nov 18, 2020 5:00 pm quote
[quote="waspmike"]
Delllboyyy wrote:
or connect it to a car using jumper leads.
Do not start the car.
Member
LX 125
Joined: 27 Nov 2014
Posts: 27
Location: London
Thu Nov 19, 2020 2:59 am quote
Hi Everyone,

Thanks again, I'll try all these when i get in from work later.

Now you mention it, it may be a battery situation issue as I've had issues with this battery before!

I'll keep you all posted.

Cheers!
Ossessionato
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
Joined: 21 Jul 2007
Posts: 4357
Location: Latina (Italy)
Thu Nov 19, 2020 6:21 am quote
... maybe the scooter was deeply offended and now takes revenge ...
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