• Husqvarna Motorcycles Made In Sweden - About 1988 and older

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    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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Mikuni Carb Intake Difference?

vintagecs

vintagecs

Husqvarna
AA Class
I need to rebuild some carbs for a 78 and 79 390 Husky and I have several carbs with the large intake bell. They are too long to fit well in the bikes, and I was wondering if I cut the bell down would it affect performance? The carbs look identical in every other way. Also, what models did the larger intake fit? All of my other 78-80 bikes are smaller, like the one on the right.

100_3348.JPG
 
Yes the space between the carb & the air box/air filter makes a difference. On a 2 stroke RD400 I had, it had the 4 grand
carb flat spot, they all have stock. Put a spacer in between the back of the carb & filter & the flat spot magically when away.

I guesses like the swirl affect inside the cylinder, there's one from the air filter too. If the cylinder is pulling in fuel from the carb, it's also pull in air thru the filter, so the spacing make a difference.

Husky John
 
The original 38mm Mikuni carbs I have here have the shorter inlet. The new one I bought a few years ago has the longer one.
It is possible that the aftermarket (non-Husky specific) are
generically longer.
 
mate had the same prob with his PE, new mikuni was substantially longer in the bell. he got it turned down in a lathe, works fine.
 
vintagecs said:
I need to rebuild some carbs for a 78 and 79 390 Husky and I have several carbs with the large intake bell. They are too long to fit well in the bikes, and I was wondering if I cut the bell down would it affect performance? The carbs look identical in every other way. Also, what models did the larger intake fit? All of my other 78-80 bikes are smaller, like the one on the right.

View attachment 47406
Click to expand...

Absolutely, you can cut down the airbell to the same length as the short style. And yes the lathe works best and the easiest way to do it. I have personally done this many times. It won't effect performance as the rubber air box boot acts as part of the air intake track. I beleive the longer style carbs started being used on the 1983 models. Hope this helps!

Marty
 
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