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UTC

Member
LX 50 "Bernadette"
Joined: UTC
Posts: 29
Location: CT, USA
 
Member
LX 50 "Bernadette"
Joined: UTC
Posts: 29
Location: CT, USA
UTC quote
I currently have my the motor of my beloved Bernadette sitting on my work bench. I did the Malossi 80cc upgrade a couple years ago and she's been a dream to ride, until now. Here's what I've been dealing with lately.

Came home from work a couple weeks ago and she died when I got to the driveway. Interesting, but nothing crazy. Took the lady out to dinner and after 3 miles or so she started to sputter. I could give it gas and limp it along, but ultimately she died again. I could start it for a few seconds when warm and it would die again. Luckily my buddy was able to come retrieve me and my pissed off wife.

I have read up on posts and checked a few videos, because I don't want to be THAT GUY that just posts his problem without researching it.

I have since done the following:
- Replaced the spark plug
- Swapped the CDI with a good one
- Replaced air filter
- Checked belt, variator and rollers for signs of excessive wear (nothing out of the ordinary)
- Drained the gas tank and replaced the fuel tap
- Checked the vacuum and fuel lines for leaks
- Removed, disassembled and cleaned the carb / jets

As before, when cold the scooter will start and idle just fine for about 5 minutes. I can give it gas and rev it on the stand. After it starts to get warm it will start to bog down and I can rev it a few times until it starts to sputter and then dies. It will start when warm for a few seconds and die.

I've half a mind to start checking for a cracked cylinder body or a sticky valve at this point. Maybe the auto choke on the carb? Any ideas for where to start poking and prodding, before I throw the old girl into the lake, would be immensely appreciated.
@rottekatz avatar
UTC

Hooked
Primavera 150
Joined: UTC
Posts: 128
Location: Monument, Colorado
 
Hooked
@rottekatz avatar
Primavera 150
Joined: UTC
Posts: 128
Location: Monument, Colorado
UTC quote
rainking63 wrote:
I've half a mind to start checking for a cracked cylinder body or a sticky valve at this point. Maybe the auto choke on the carb? Any ideas for where to start poking and prodding, before I throw the old girl into the lake, would be immensely appreciated.
Do a compression check. Please do not throw wife into lake. Unless, of course, she wants to go for a swim.
UTC

Veni, Vidi, Posti
Joined: UTC
Posts: 7032
Location: Tega Cay, SC
 
Veni, Vidi, Posti
Joined: UTC
Posts: 7032
Location: Tega Cay, SC
UTC quote
This sounds fuel related because it seems to work fine until the auto choke is disengaged. I would start by making sure there are no crack in the rubber intake manifold. If that checks out then move on the the jets in the carb, the o-ring on the idle mixture screw and the carb diaphragm. Something is leaning out the fuel delivery.
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