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Turbofiat124

2004 350 Bruin caliper mounting problem

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Hello! I don't own any ATVs but I am into everything else mechanical. The reason for my post is a co-worker who has a bunch of ATVs but is not mechanically inclined or like to post on forums has a 2004 Yamaha 350 Bruin that hasn't ran in a several years because of a mechanically issue. I told him I'd help him get it running. The float valve and jets probably need to be cleaned in the carburetor which shouldn't be a big deal.

I have not seen it but here is the problem he describes.

The piece that the caliper bolts to broke at some point. I don't know if this is a simple caliper bracket like on a car or it's the control arm or what this piece is.

So he bought an OEM part off Ebay. Afterwards the upper caliper bolt holes don't line up. So for awhile he left just the bottom bolt holding the caliper in place but says eventually the caliper moves about and starts rubbing the inside of the wheel.

The way he talks the lower bolt holes line up but the other one is off by half and inch or so.

He wanted to see if we could enlarge the hole in the caliper or enlarge the hole in the bracket and use a larger diameter bolt and nut so the holes would line up but that sound dodgy and I don't think a person should have to modify an OEM part to make it fit.

I told him perhaps there was a design change mid-year or got sent the wrong part to begin with and he needs to find the correct part.

Does any of this sound familiar? 

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Here is a photo I captured from a YouTube video of a guy doing a brake job on his 350.

Apparently the piece is the larger disc with holes in it behind the brake rotor.

 

 

Capture.JPG

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Well we got the Bruin fixed. Took the carburetor off and gave it a good cleaning. This has to be the most complicated carburetor I've ever seen outside a Rochester Quadrajet! I did not have a good feeling but after cleaning the jets it no longer cuts out and backfires under full throttle. Cleaning gummed up carburetors on stuff sitting around with 5 years of evaporated fuel seems to be hit or miss.

Now onto the front end. Turns out the kingpin was the correct part, everything else was boogered up.

Turned out the rotor and the caliper mounting bracket were bent from where the kingpin had broke. That was why the bottom hole in the caliper bracket did not line up with the kingpin. Also the rotor had wore a groove into caliper, almost through one of the pad pins, halfway through the other and sheared off the peg and the bolt in the caliper mounting bracket.

So we got a used hub with rotor + lug nuts, caliper mounting bracket, new pads and a new pad pin ($9.00!). $72 in mostly used parts.

Yamaha's front brake caliper diagram does not show the bolt. I called the local Yamaha place and the guy seemed clueless at first but lead me to believe you had to buy the entire caliper to get it. OUCH!

So I had to improvise. I would NOT want to do this on car. I had cut 10 mm of this bolt off, install a bunch of nuts, grind the edges off so the caliper wouldn't wobble then to apply Locktite to the threads and adjust the bolt until the caliper was not in a bind. So far so good but I'd still like to fix it right.

 

IMG_20170309_114454209_zpsobxdgpu8.jpg

 

The larger piece below is what I need to fix it right.

s-l1600.jpg

 

This link says this piece will not fit a Bruin 350 but it looks exactly like the part. But you know how Ebay's cross reference guide is. Yeah it may only fit a Raptor but it may also fit a Bruin but the seller does not indicate that it does.

Any idea if this bolt will fit a Bruin? 

http://www.ebay.com/itm/182415423370?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

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