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carnaby 125
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Location: uk
 
Hooked
carnaby 125
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Location: uk
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for a while its now got worse

my coolant cap makes a hissing sound after I just been running it for 10minutes its not overheating and still staying below half way and no milky colour in the engine oil

i checked for leaks on the pipes nothing is there a chance i got a slight gap on the head gasket that causing over pressure as ive tried 2 different caps but i not tried a new coolant tank yet
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Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni, 2008 Vespa S150
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Veni, Vidi, Posti
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2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni, 2008 Vespa S150
Joined: UTC
Posts: 8951
Location: Ashburn, Va. Home to the Internet
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Call a few auto shops and ask if they have a CO2 head gasket tester.
You want them to test at the radiator cap (with it off) for CO2.
Link to a test kit
https://tinyurl.com/y7sekevp
Links to how to videos if you just want to buy your own kit.
https://tinyurl.com/ybhxxl6k
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carnaby 125
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carnaby 125
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Problem is it doesn't have a radiator cap only have the coolant reservoir cap
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Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni, 2008 Vespa S150
Joined: UTC
Posts: 8951
Location: Ashburn, Va. Home to the Internet
 
Veni, Vidi, Posti
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2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni, 2008 Vespa S150
Joined: UTC
Posts: 8951
Location: Ashburn, Va. Home to the Internet
UTC quote
Same thing. You need to see if the exhaust is getting into the coolant.
Any shop that has the tool should understand the tests needed.
There is a way to test exhaust for coolant too but I forgot how.
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carnaby 125
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carnaby 125
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well I just flushed coolant and put new coolant and next day looked in and its grey again and theres tiny bits floating but not metal its like rubber very tiny tiny micro bits of black but waterpump isn't making a noise and no leak from that area

I don't get white smoke
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Rally180
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Location: Newport Beach, California
 
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Rally180
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Location: Newport Beach, California
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If the coolant changed color, then you have a leak. Head gasket is most likely. A CO kit test will be further proof.
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carnaby 125
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Location: uk
 
Hooked
carnaby 125
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well im thinking of asking garage for a price of fitting new gasket and might aswell get new piston and rings at same time if its more then what the scooter worth I just might replace it with another scooter
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