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Dohc 82' 900f running 79' 750k carbs, Needle question

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Dohc 82' 900f running 79' 750k carbs, Needle question

Are these needles interchangeable within carbs? Eg. cb900f carb guts in cb750k carb. Are needles same in length? Bike starts, and idles nicely, under loading while riding, there is some backfire during deceleration after quickly returning throttle to closed.

I believe I can get this thing tuned, just need to know if by using the cb900 needle instead of the cb750's it is causing my symptoms. Also how can I findout which needle will be richer versus leaner.

cb900f 82'
stock needles
D447 or D295

cb750k 79'
Stock needle
D307

If they are interchangeable, I will try using whichever needle is richer to see if that cures my midrange tuning.

If not, then will continue towards finding suitable needle shims or a replacement 82' or compatible cb900f rack.

1982 cb900F (2016-Present)
1979 cb750k (2010-Present)

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Re: Dohc 82' 900f running 79' 750k carbs, Needle question

Administrator

I am sure that all the parts between the two carbs are interchangeable, but I do not know which needle would be leaner/richer. You might be able to determine this by measuring them with a caliper at different points though.
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
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Re: Dohc 82' 900f running 79' 750k carbs, Needle question

Administrator

Caliper or micrometer, just make sure they are really accurate. No cheap plastic junkers will do here.

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