How can I fix the carbs on my ‘72 Yamaha DS 7?
December 14, 2009 | Motorcycles
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Re: “How can I fix the carbs on my ‘72 Yamaha DS 7?”
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there are two directions to go in this repair:
To establish if there is too much or not enough fuel in the spark plug, take a spark pug reading as follows:
A) If it is dark at all, it is running on the rich side. You will also see an excessive amount of smoke while running
B0 If it is white or light colored, it is running lean
C) If the spark plug is “chocolate or a little lighter, the spark plug is ok.
There are 2 circuits in the carb, air and fuel, the probable cause is a blockage in the fuel circuit, due to old gasoline.
The solution is to disassemble the carb use carb cleaner, blow out every jet, hole and part you can find and then re assemble.
heres a good site for car/bike problems… bibles for all sorts of stuff.. gives a good basic explanation..:&tbnh=85&tbnw=130&prev=/images%3Fq%3Dradial%2Bbrakes%2B%26gbv%3D2%26hl%3Den%26safe%3Doff%26sa%3DG
heres a good site for mikuni carbs…manual downloads as well..
Microfiche (parts diagrams) -
Shop manual -
Search for - Yamaha
Then narrow your search to -1972
Purchase a shop manual before they go out of print. It was difficult to find this one.
Even if you don’t do your own work, Buy One.
Motorcycle shops don’t work on any bikes over 10 years old, because they don’t have manuals and new mechanics don’t know anything about them.