air cutoff valve spring


Information and questions on GL1200 Goldwings (1984-1987)
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pastr
Posts: 2
Joined: Tue Apr 05, 2016 6:36 am
Location: Israel
Motorcycle: 1986 GL1200A Aspencade

air cutoff valve spring

Post by pastr » Tue Sep 25, 2018 5:29 am



Hello
I have 1986 asp.
I have backfires and hesitation on cold run, after acceleration and warm up it's gone.
I suspect at the air cutoff valve spring, It feel like it's too hard and supposed to be softer.
The spring is part of rebuild I did (randakks kit), I didn't compare it to the previous spring, so I don't know if it's O.k or not.
what is your recommendation?



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virgilmobile
Posts: 8698
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: air cutoff valve spring

Post by virgilmobile » Tue Sep 25, 2018 7:54 am

Going by memory..those springs are very stiff normally.
Is your backfiring in the exhaust or carbs.?

pastr
Posts: 2
Joined: Tue Apr 05, 2016 6:36 am
Location: Israel
Motorcycle: 1986 GL1200A Aspencade

Re: air cutoff valve spring

Post by pastr » Tue Sep 25, 2018 9:22 am

I didn't pay attention but it look like in the carbs.

User avatar
virgilmobile
Posts: 8698
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: air cutoff valve spring

Post by virgilmobile » Tue Sep 25, 2018 10:43 am

Ok..pay attention next time.Those cutoff valves are operating only on deceleration.They open with the high vacuum and enrichen the fuel through the hard decell to keep the engine from going lean and prevent exhaust backfire.
Intake backfire could be related if the valves are stuck open or where the plunger is fitted,is binding.Usually tested without the spring first before assembled.



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