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@danie avatar
UTC

Hooked
'57 VN2, '70 180 Rally, '80 P150X, '80 P200E, '05 GT200
Joined: UTC
Posts: 357
Location: George, South Africa
 
Hooked
@danie avatar
'57 VN2, '70 180 Rally, '80 P150X, '80 P200E, '05 GT200
Joined: UTC
Posts: 357
Location: George, South Africa
UTC quote
My Sprint starts fairly easy, runs well for a few 100m, then dies as if it is out of fuel. If I run-start it again, it starts fairly quick, but dies again in a few 100m. At that stage it does not kickstart at all.

Enough fuel, spark is good, fuel cap breather open. I have tried a slave condenser, still no joy.

What else can I check or try?
@mjrally avatar
UTC

Veni, Vidi, Posti
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 59 Ser 2, 65 Silver Special, 90 V5N 50, 2015 HD Road Glide Special
Joined: UTC
Posts: 5138
Location: Oceanside, CA
 
Veni, Vidi, Posti
@mjrally avatar
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 59 Ser 2, 65 Silver Special, 90 V5N 50, 2015 HD Road Glide Special
Joined: UTC
Posts: 5138
Location: Oceanside, CA
UTC quote
Dont know Sprints, but I'm guessing electrical. If you let everything sit for a while can you magically kickstart it? Then it dies when the motor gets warm? Then if you let it sit for a while it magically works again? Thats definitely a failing coil.

If not, is there a kill wire on those? Disconnect it or the handlebar cover and ride. Maybe you have something similar to the P200's green wire of death (kill wire sucks and shorts on you).
UTC

Hooked
PX 150 and GTS 300 HPE Super Tech
Joined: UTC
Posts: 418
Location: Dublin, Ohio
 
Hooked
PX 150 and GTS 300 HPE Super Tech
Joined: UTC
Posts: 418
Location: Dublin, Ohio
UTC quote
It sounds like your fuel line may be kinked, allowing enough fuel to reach the carburetor to start and run until the float bowl runs dry, then slowly refilling. I would pull the tank and check the fuel line before doing anything else. A bend in a fuel line can become a partial obstruction over time.
@sdjohn avatar
UTC

Johnny Two Tone
'15 GTS300, '86 PX125EFL, '66 VBB, '01 ET4
Joined: UTC
Posts: 8540
Location: San Diego, CA
 
Johnny Two Tone
@sdjohn avatar
'15 GTS300, '86 PX125EFL, '66 VBB, '01 ET4
Joined: UTC
Posts: 8540
Location: San Diego, CA
UTC quote
when you pull the tank like apex says, get a fuel flow measurement with cap on and cap off. this way you can check your fuel tap and your venting. take the time to flow 1 pint. you want nothing more than 30s.
@v_oodoo avatar
UTC

Style Maven
'74 50s x3 '87 PK125XL '92 PK50XLS Plurimatic - & - '58 AllState '68 Sprint '66(?) Super125 and '72 DanMotor Super150
Joined: UTC
Posts: 9618
Location: seattle/athens
 
Style Maven
@v_oodoo avatar
'74 50s x3 '87 PK125XL '92 PK50XLS Plurimatic - & - '58 AllState '68 Sprint '66(?) Super125 and '72 DanMotor Super150
Joined: UTC
Posts: 9618
Location: seattle/athens
UTC quote
spark or gas?
I'm betting on gas. Here's how to test so you can eliminate spark.

I had a similar problem w/ my Rally - couldn't be sure if it was gas or spark when it died. So I added a 2nd external sparkplug to see if spark died when the motor did. Yep on mine, there would be spark then suddenly zero spark. Fixed the ignition and scoot ran good after. Here's a link w/ a vid and a pic of how to do it.

https://modernvespa.com/forum/post1548781#1548781

External inline image provided by member with no explanatory text

Assuming you have a good plug in the motor, you should get a spark on BOTH plugs & your motor will run if you're getting gas etc.
UTC

Veni, Vidi, Posti
Joined: UTC
Posts: 7037
Location: Tega Cay, SC
 
Veni, Vidi, Posti
Joined: UTC
Posts: 7037
Location: Tega Cay, SC
UTC quote
Sure sounds like fuel, or rather, the lack of.
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