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RPM increase when running out of gas
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goggler2
UTC
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2023 GTS 300 / 2009 S 150 / 1980 P200 w/Sidecar /1979 P200
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Posts: 16
Location: Orange Beach, AL
 
goggler2
Member
2023 GTS 300 / 2009 S 150 / 1980 P200 w/Sidecar /1979 P200
Joined: UTC
Posts: 16
Location: Orange Beach, AL
UTC quote
resurrecting a 79 P200e. It is running pretty well but when parking it, I turn off the fuel and let it run dry. As it get close to running out, there is a significant increase in RPM. Could that indicate the mixture is too rich and it runs better as it leans out? Or is it just a natural thing?

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orwell84
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Location: northern New York
 
orwell84
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Location: northern New York
UTC quote
Normal. It leans out as the float bowl goes dry.
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goggler2
UTC
Member
2023 GTS 300 / 2009 S 150 / 1980 P200 w/Sidecar /1979 P200
Joined: UTC
Posts: 16
Location: Orange Beach, AL
 
goggler2
Member
2023 GTS 300 / 2009 S 150 / 1980 P200 w/Sidecar /1979 P200
Joined: UTC
Posts: 16
Location: Orange Beach, AL
UTC quote
Does that mean it is running too rich?
FridayMatinee
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1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
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FridayMatinee
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1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
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Posts: 2157
Location: Philadelphia
UTC quote
goggler2 wrote:
Does that mean it is running too rich?
No it means you're running out of gas. The fuel isn't getting to the cylinder anymore so the rpm's rise due to it being a quick leaning out situation. It's fine.
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scooterist
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Molto Verboso
71' Sprint Veloce , 05' Vespa PX150, 1978 P200E
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Posts: 1600
Location: Tucson, AZ
 
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Molto Verboso
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71' Sprint Veloce , 05' Vespa PX150, 1978 P200E
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Posts: 1600
Location: Tucson, AZ
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Very normal. Even the nitro remote control cars/trucks will do it. Can I get a Amen on R/C cars?
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Ginch
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Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
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Location: Victoria, Australia
 
Ginch
Veni, Vidi, Posti
@ginch avatar
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
Joined: UTC
Posts: 8781
Location: Victoria, Australia
UTC quote
A friend was doing about 65mph when he ran out. Seized, had to buy a new top end. Since then I've run a pump. Doesn't stop you from running out, it just means that the last little bit doesn't slow to a trickle and make you run lean.
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