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CBR125R thread sizes...

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mattsprattuk
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PostPosted: 11:09 - 02 Dec 2019    Post subject: CBR125R thread sizes... Reply with quote

So.... Here's the challenge. I'm inventing something, CBR engine is the prototype workhorse, and I'm utilising the timing cover as part of it.

https://i.ibb.co/4VLt1Nz/10067092.jpg

https://i.ibb.co/jDfG8md/000000227385-1.jpg

"The big one" is what I'm talking about.

So... In my wisdom, at the prototype stage, I threw out the old one because it was useless innit.

Does anyone know what the thread size and pitch is?
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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mattsprattuk
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PostPosted: 11:12 - 02 Dec 2019    Post subject: Reply with quote

https://i.ibb.co/84LzqKy/Capture.jpg

sneak preview for anyone that gives a shit
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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jaffa90
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PostPosted: 12:18 - 02 Dec 2019    Post subject: Reply with quote

If no cap what`s the diameter of the threaded hole in the casing (say 30mm) and the pitch of the thread there (say 1mm , 1.25mm).
The depth is the casing thread.
A power take off on the crank? Rolling Eyes
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WD Forte
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PostPosted: 12:44 - 02 Dec 2019    Post subject: Reply with quote

Measure the diameter first then a thread gauge will tell you the pitch

If it is an M30 for instance then the thread could be 3.5, 3, 2 or 1.5mm
Guess at your peril

So you want drive a cog off a 125 2T crank eh?
Supercharger?
Exterior alternator?
Pedals?
Grass collection brush?

what could possibly go wrong?
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Pete.
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PostPosted: 13:44 - 02 Dec 2019    Post subject: Reply with quote

I hope that whatever's driving that sprocket had a left hand thread, coz otherwise it's going to un-do itself.

Anyway, measure the pitch with a ruler over as many threads as you can, then add it to the ID then round up to the next whole number, and that's the thread size.
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Easy-X
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PostPosted: 14:23 - 02 Dec 2019    Post subject: Reply with quote

Remove timing cover, add collar, insert shaft (oo-err!) with cog, attach to water pump previously stowed on the back of the bike. I'm getting some "save lives in the Third-World" vibes Thinking
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mattsprattuk
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PostPosted: 15:12 - 02 Dec 2019    Post subject: Reply with quote

I was after more along the lines of if someone knew off the top of their head as I don't have the engine in front of me for a while. I'm well aware of how to size threads if I have them. It'll be an M30xSomething. Probably 2 or 1.5 as mentioned, but I'm doing the CAD work for manufacture from here as much as I can.

Re: Undoing itself, of course, but the current prototype is fine, and it's a proof of concept, not a finished product. The final would be keyed or whathaveyou. At the moment it's loctited along with a nordlok washer. It's a low torque application, that works perfectly.

At the moment it's shittily machined and welded. This is just a slightly* more refined prototype that has some automation involved.

WD Forte wrote:


So you want drive a cog off a 125 2T crank eh?
Supercharger?
Exterior alternator?
Pedals?
Grass collection brush?

what could possibly go wrong?


All in good time Wink

Easy-X wrote:
Remove timing cover, add collar, insert shaft (oo-err!) with cog, attach to water pump previously stowed on the back of the bike. I'm getting some "save lives in the Third-World" vibes Thinking


Fuck no. Check some of my previous posts to find out if I care about 3rd world countries.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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stinkwheel
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PostPosted: 16:03 - 02 Dec 2019    Post subject: Reply with quote

Outrigger bearing for a mechanical supercharger?

Edit: Automatic toe amputation device?
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mattsprattuk
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PostPosted: 17:15 - 02 Dec 2019    Post subject: Reply with quote

stinkwheel wrote:
Outrigger bearing for a mechanical supercharger?

Edit: Automatic toe amputation device?


Maybe one of these

https://media.giphy.com/media/10qpYnaltOGAgw/giphy.gif

But keep guessing. It'll be revealed soon...
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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Easy-X
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PostPosted: 17:18 - 02 Dec 2019    Post subject: Reply with quote

"Yes miss, the Yamaha does red-line at 16,000rpm..."
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garth
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PostPosted: 18:23 - 02 Dec 2019    Post subject: Reply with quote

Could use grub screws to hold it in place, like the steahly flywheel weights
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WD Forte
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PostPosted: 23:24 - 02 Dec 2019    Post subject: Reply with quote

Ahh
CBR not NSR! so 4T not 2T, dunno why NSR got stuck in my brain.
That cap is 30mm BTW and as the cover is on the LH side
you wont need a LH thread to driive a...... 'THING'

I hope you put a guard around it
as a baby kitten could easily get their head stuck in that.
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