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Mikuni Velocity Stack Modification 15 Jul 2021 08:53 #851789

  • daveo
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I want to increase the flange ID of a set of Mikuni KRS- velocity stacks from 55 to 56 mm. which will allow them to fit my BS34 carbs.

How do I accomplish this? 

1982 KZ1100-A2

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Mikuni Velocity Stack Modification 15 Jul 2021 09:54 #851791

  • z1kzonly
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You need to find a shop that has a swag / swager machine, an hydraulic expander. Find a local cheap Chain Muffler Shop? Like Midas, Muffler Man etc. If you have anything like that around you. Most shop guys would help you out for a coffee or lunch.
At least I have done this local.
With your clean ride! I am sure you want to do it nice with precision!
Livin in "CheektaVegas, NY
Still have a Kaw! 76 KZ900 Pro-Street.
Went thru 25 of these in 40 yrs.

And The Old Girl, Harley 75 FLH Electra Glide,
Old faithful! Points ign. Bendix Orig. carb.
Starts everytime!

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Mikuni Velocity Stack Modification 15 Jul 2021 12:46 #851795

  • Nerdy
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You can also pick up an exhaust expander tool (AKA a pipe stretcher) for not a lot of money - probably a bit less than another set of stacks would cost.

Or if you don't want to buy one (perfectly understandable) you might be able to rent one from a DIY hire shop. I'm not sure what options you have there; auto parts stores in the US often have tools to lend/rent.
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
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