SP1 rear brake caliper - cross threaded - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 6 (permalink) Old 04-21-2016, 01:43 PM Thread Starter
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SP1 rear brake caliper - cross threaded

I am getting into general maintenance and ran into a problem when changing rear brake pads. Previous owner cross threated the upper right bolt. Rather than getting another caliper, i am thinking about trying to tap the hole. I know its an M12 but does anyone know the thread pitch by chance. Having trouble finding metric taps anyway, but I want to make sure I get the right size. I know 1.5 is way too big so im thinking its 12x1.0, but i dont have a guide handy to verify.
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post #2 of 6 (permalink) Old 04-21-2016, 05:24 PM
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Just measure the pitch on the bolt- count ten threads and divide the distance between peaks by ten. It gives a surprisingly accurate result.

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post #3 of 6 (permalink) Old 04-21-2016, 10:13 PM
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If it's M12 size, it's probably 1.25 pitch as I don't recall ever having to repair an M12 x 1.0 thread or find a bolt for one on a japanese car (Bikes tend to use the same thread pitches as Japanese cars) but I haven't measured, just a guess. Get the M12 taps (1.0 & 1.25) you think it might be and one will fit anyways. Good to have these things in a tool box for future possible use.

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Last edited by The Stig; 04-21-2016 at 10:15 PM.
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post #4 of 6 (permalink) Old 04-21-2016, 10:24 PM
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M12 X 1,25 is common
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post #5 of 6 (permalink) Old 04-22-2016, 07:39 AM
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i have another SP1 rear caliper bracket if thats easier, PM me ill let it go cheap.

just swap it on

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post #6 of 6 (permalink) Old 04-22-2016, 08:50 AM Thread Starter
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Thanks everyone. I was considering just swapping it, and probably should have, but being stubborn I went out and bought a thread repair kit. The thread was too damaged to get it back. I have no idea how the thing was on there in the first place. My guess is an airwrench and a few beers to ignore how bad it was. I was so excited for this bike that I bought it without really looking at some of the finer details. I can live with the scratches here and there, cracks, etc. But man, some people just don't take their time when working with modifications. LUCKILY, they had the sense to get a full Akropovic exhaust. It's honestly what sold me on the bike.

Anyway, the bold ended up being 12x1.25. Unfortunately, living in this crazy standard world of America, the only Metric kits I could find had 12x1.75 or 12x1.50. I ended up just getting a thread repair kit, drilled out the hole, and put new threads in. It was amazing how well that thing worked and how quick it was. Forced me to change my brake fluid anyway. I didn't actually get to it until 11pm, and in the interest of not waking up my neighbors kids, I didn't get a chance to test the brakes, but as far as I can tell, I should be in business.

Thanks for all the help and RC, thanks for the offer. Now, if someone has any SP1 bodywork...
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