Whiskerfish wrote: ↑Thu Sep 23, 2021 7:05 pm
The one time I saw one of those caps actually fail was due to a backfire. Popped that sucker right off. I suspect that is how most get cracked
agreed!
I spotted this *odd looking piece of something* on my garage floor in early April, 2018. Didn't know what it was or where it may have come from and left it laying there. Looked at it again and decided to set it on trike's right side floorboard.
Backing up now,
Trike had been hibernating for at least 3 months since my last attempt to start its engine on one of those unusually brief warm days, mid-Winter. May have been on New Years Day. The attempt was cut short at my wife's insistence. " It's too cold! "
The engine had been sputtering while cranking and I twisted the throttle open just to make some noise for her benefit. The engine snorted and popped several times. I felt bad that I had been so unthoughtful to the very cold engine.
Turned the key switch off, turned the fuel valve OFF and left it to resume hibernating.
20180421_165740_resized.jpg
April, 2018, I sat down beside trike to check its engine oil level before starting the engine . As you will note on the top of number 1 carburetor vacuum piston cap, something is amiss. hmmmmmm? I gradually recalled the snorting and popping engine event 3 months earlier and wondered if that *odd looking piece of something* on the right side floorboard actually belonged in that opening. Yep. fit perfectly.
20180421_165917_resized.jpg
Fortunately, the vacuum piston, itself, wasn't damaged!
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Cliff

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RE: a thorough fuel tank cleaning
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Cliff
'75 GL1000 home built trike;
http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
October,2017 BOTM
https://nakedgoldwingsclub.com/forum/page/Welcome
previous rides:
1953 H-D Servi-car, naked, 1969-1978 (serial#53G1559 committed to memory!)
1980 CB900 Custom (triked) 1997-2003 .... R.I.P.