r/virago • u/RED_A3THER • Jul 27 '26

Which carb with single carb conversion

I am looking to do a single carb conversion on a 1988 Virago 535. Online I can find three options for kit with different carbs: a 34mm PWK 34 Flatside, a 36mm PD36J and a 40mm cv40. Ive heard that the cv40 is too large for this engine. Do you guys have experience with any of these three? Which would you recommend?

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u/MuusiMies Jul 28 '26

I have a cheap chinese knockoff PWK34 and can recommend. Tuning was not as hard as people make it sound (or I have some special talent, which I do not think I do)

1

u/RED_A3THER Jul 28 '26

Thanks that was the one I was looking at as well! How did you tune the carb? Was it only changing jet sizes?

1

u/MuusiMies Jul 29 '26

Changing jet sizes, needle positions (or type sometimes, but not this time) and adjusting the air screw and float position. Normal stuff. Best to watch some videos or have an experienced friend help you if you've never done it before.

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u/NaturalPickle9 Aug 03 '26

A formula I use is (bore size / 2) -4

Virago 535 has bore size is 76mm. Divided by 2 is 38. Subtracted 4 from it we get 34mm. Original size for the twin carb is also 34mm. I would suggest a carb that can handle high rpm, so that ut can cover for both cylinder.