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Author Topic: What did you build this week?  (Read 96546 times)

Offline Sonreir

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Re: What did you build this week?
« Reply #700 on: Sep 01, 2017, 12:37:00 »
Sonreir™, can you post the circuit you're using for that?  I could use something on my CB125S converted to 12v.

Sorry... normally I would, but this is hopefully going to become a product.

I'll steer you in the correct direction though... It's just a simple voltage divider and then I use an analogRead() from the Arduino (along with a bit of math) to work out the input voltage.
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Offline ChopperCharles

  • Posts: 56
    • Modified Motorcycles by Chopper Charles
Re: What did you build this week?
« Reply #701 on: Sep 01, 2017, 14:09:40 »
I've got a couple things I've been working on over the last two weeks.

First, I blew a KT88 in my Yaqin MC-100B tube amp. It went gassy, and took out a couple resistors and burned through the insulation of some wiring.


So I replaced the resistors, and while I was in there I also replaced the blue LED that had burned out, adding a current limiting resistor and a diode to prevent reverse voltage breakdown (the source is 7v AC). I replaced it with a red LED... but I think I actually like the blue better, so i'll be taking it back apart soon. I also replaced the four input capacitors (the blue boxes) with some better audio grade caps.


Charles.



Offline ChopperCharles

  • Posts: 56
    • Modified Motorcycles by Chopper Charles
Re: What did you build this week?
« Reply #702 on: Sep 01, 2017, 14:14:19 »
Next project, I wanted blue anodized passenger footpegs for my 1992 EX500 project. They're not available. However, EMGO makes a pair for the EX250. I snagged them, and they mounted up in the EX500 brackets, with the spring and collar from the EX250, but without the ball and divot plate from the EX250. This is fine, except the EMGO pegs have a slightly different profile on the clevis, which means they won't rotate up and down in the EX500 bracket. They do in the EX250 bracket, but only just barely.  You can see the extra material on the EMGO footpegs when the EX250 collar is set on it. That material (later marked with a green sharpie) must be removed. I filed it down, and got the pegs to fit in the EX500 brackets, and rotate properly.

Charles.

Offline ChopperCharles

  • Posts: 56
    • Modified Motorcycles by Chopper Charles
Re: What did you build this week?
« Reply #703 on: Sep 01, 2017, 14:40:18 »
Finally, I've been troubleshooting low power and gas mileage issues with my CX650 Street Scrambler. Turns out I had built my custom exhaust using CX500 headers instead of CX650 headers. I bolted on a pair of CX650 headers and immediately got a whole bunch of top end power that was missing previously. So, what's the difference between CX500 headers and CX650 headers? Both headers are dual-walled designs. The 650 headers have a larger ID for the inner pipe, and the weld that connects the inner and outer pipes is ground down on the 650. The 500 weld bead sticks up prominently. This means the ID of the CX500 pipe at the head connection is 1.21", while the 650 headers have an ID of 1.30". That's a 7.2% difference!  I'm not sure what effect that has on CFM, but it made for a significant increase in top end power.


CX500 header ID:






CX650 header ID:







What I had done was cut off the original CX500 header flange where it bolts into the engine, and then welded 1/2" exhaust pipe onto that. The inner wall was gone, past the cut, but there was a 1" ring of the inner wall, and the original weld bead in the pipe. I got my trusty air-powered dremel knockoff from Harbor Freight (seriously, get an air one, they last forever and never overheat and burn out), and ground out that weld and removed the ring of the inner pipe. Then I ground everything down even further, so the ID of the flange is now the same ID of the exhaust pipe, and significantly LARGER than the ID of the OEM 650 pipe. The ID is now 1.39"! That's a 5.9% increase over the stock 650 header, and whopping a 13.8% difference over the original 500 headers!

Modified header ID:







While I was working on them I welded an adapter flange onto the end of the pipes so I don't have to use those shitty adapters to mount 1.75" mufflers (those adapters ALWAYS leak), and I'm waiting for the paint to dry. Then I'm going to re-wrap the pipes and spray them down with silicone sealant, and I should have my maiden test ride with properly-sized custom headers Saturday or Sunday.

Charles.
« Last Edit: Sep 01, 2017, 14:45:07 by ChopperCharles »

Offline ChopperCharles

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Re: What did you build this week?
« Reply #704 on: Sep 01, 2017, 14:46:06 »
And here's a before and after shot of my custom pipes.

Charles.

Offline vwrabbit

  • Posts: 105
Re: What did you build this week?
« Reply #705 on: Sep 05, 2017, 11:39:42 »
No problem!  Figured it was a voltage divider.  Thanks for the tip!

Sorry... normally I would, but this is hopefully going to become a product.

I'll steer you in the correct direction though... It's just a simple voltage divider and then I use an analogRead() from the Arduino (along with a bit of math) to work out the input voltage.

Offline ChopperCharles

  • Posts: 56
    • Modified Motorcycles by Chopper Charles
Re: What did you build this week?
« Reply #706 on: Sep 05, 2017, 11:40:54 »
And here's a before and after shot of my custom pipes.

Charles.

This fixed my problem completely! I found my missing power!

Charles.

Offline jag767

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Re: What did you build this week?
« Reply #707 on: Sep 06, 2017, 08:29:02 »
Turned this into this for my "other" hobby

Offline ridesolo

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Re: What did you build this week?
« Reply #708 on: Sep 06, 2017, 19:36:09 »
Turned this into this for my "other" hobby 

Peeping Tom?   ;D 
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Offline 1fasgsxr

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Re: What did you build this week?
« Reply #709 on: Sep 06, 2017, 19:37:48 »
^ 😂