Wilwood Kart Master Cylinder Assembly w/ Bracket - 1/2in Bore

Wilwood Kart Master Cylinder Assembly w/ Bracket - 1/2in Bore

Marsoni

M251S

$175.00

Get it in 3 business days with 1 day shipping. Friday, May 29

Wilwood Kart Master Cylinder Assembly w/ Bracket - 1/2in BoreThis super lightweight (only . 55 pounds) 1 2 bore aluminum master cylinder designed specifically for Kart and Jr. Dragster racing applications incorporates an adjustable lever ratio with a remote mount clear fluid reservoir for easy monitoring. The assembly comes ready to install and includes billet bracket, lockwired drilled hardware and fluid line fitting. The unit is best utilized in conjunction with Wilwoods Kart Jr. Dragster caliper.

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Appears to be well made, alignment bar slides in nicely. As stated, you need to drill a hole in the bar for the gimble bearing driver, the directions are not clear, what I did was before I take out the old gimble bearing, put an O ring on the bar close to the last step on the bar, slide the bar all the way in, then carefully slide the bar out, this marks the distance from the back of the gimble bearing to where the shaft on the outdrive bottoms out, move the O ring a 1/4” towards the stepped part of the alignment tool (this is so you won’t bottom out the alignment tool when driving the gimble bearing in) then slide the driver puck up to the O ring and use a 3/8” diameter transfer punch through the side hole in the puck to mark the bar. You need to drill a 3/8” diameter hole in the alignment bar, two V blocks, some clamps, and a drill press will make drilling much easier, after the bar is securely mounted and centered in the drill press, use a center drill, then 1/4” drill first, using plenty of oil, drill all the way through, then use the 3/8” drill, deburr both sides and you should be good to go. People complain that it doesn’t come pre-drilled, the reason is that not all out drives are the same so you have to fit it to the outdrive that you have. Fortunately, I have a machine shop at my house and have a jig setup with various drill bushings, but the method I described above should work for you. Just make sure you’re perfectly centered and secure before you start drilling.

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Reviewed in the United States on April 16, 2026