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A good test for vacuum leaks is an unlit Propane torch on low setting. If the rpms increase you found the leak(s).
 

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ole wing wrote:
this is my first post,
after starting in the am after off choke,i take off with my 1985 aspy will popp and backfire till i get over 3000 rpm,i was trying to get the carbs sync before we did that we did a compression check  3 cyls has 180lbs.1 cyl had 130 lbs we added oil and it cam eup to 180 like the rest,i have taken the carbs apart twice and cleaned them,still having the same issue,and it seems to be getting worse since the mornings are getting colder
sorry for the long post any ideas thank you
More info needed.

How did you clean the carbs?
What is the history of the bike?

Pull the plug wires and caps and inspect for corrosion. Replace with new 7mm bulk wire, 6' cut to 18" ea. New NGK spark plug caps. Ambient moisture will get in the cracks of old wires and plug caps and you will get the popping, hard starting while cold and smooth out as engine heat warms up and dries the moisture in the cracks out.
 

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My 83 was neglected that way for 13 years in a hot garage. 3 months of restoration.
b.o.s.?
 

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Have you inspected the plug wires yet? Replaced the plugs with new NGK plugs?
 

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ole wing wrote:
i took the carbs apart but left left them on the plenum,i took out the all the needles and float valves and cleaned them with a very thin wire,the history for the bike was the po left it uncovered and tank full of fuel for the  3 years,he lost the title and b.o.s
he left it for dead
This may be the problem. Improperly cleaning the carbs. They need a total take every piece apart and boiling to clean or a Carb cleaner dip soak for 24 hrs. Many little ports that get gummed up that you missed. Little fuel ports through the Plenum.
 
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