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Stalling/Sputtering Problem FIXED

 
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NCJ8
Member


Joined: 27 Sep 2017
Posts: 24
Location: Princeton, NJ
'12 Stella 4t

PostPosted: Thu Jun 28, 2018 6:23 pm    Post subject: Stalling/Sputtering Problem FIXED Reply with quote

I posted a few months ago about a stalling/sputtering issue I had with my '12 150 4t. The bike was acting starved at the end of my 15 minute commute and would occasionally even stall. Not fun. I tried a few things recommended in other posts--the evap had already been disconnected by the previous owner, I tried a buddy's vented 2t gas cap, shortened up the gas line to the carb, added a small one-way valve to the evap outflow tube, drilled out the gas cap--but none of these worked for me.

The trick was noticing that the previous owner had swapped out the OEM seat for a "racing" style one, and that someone else on here with that seat was having similar issues.

The problem was that the seat was blocking off air to the vented gas cap, causing a vacuum, and hence starving the carb. The fix was simple: drilling out the gas cap more, putting a short stint through it (a section of a WD-40 spray nozzle), and drilling a hole in the bottom of the seat.

5 tanks and about 600 miles later, and I haven't had a single splutter.
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BuddyRaton
Scooter Dork


Joined: 09 Sep 2006
Posts: 3835
Location: Boca Raton, Florida
2 - many

PostPosted: Thu Jun 28, 2018 9:17 pm    Post subject: Reply with quote

Nice diagnosis and fix! Nothing better than figuring it out and then fixing it for free!
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'06 Cream Buddy 125, 11 Blur 220, 13 BMW C 650 GT, 68 Vespa SS180, 64 Vespa GS MK II, 65 Lambretta TV 175, 67 Vespa GT, 64 Vespa 150 VBB 64 Vespa GL
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