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Author Topic: CM 185T - The Learning Curve  (Read 12629 times)

Offline tomgbda

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Re: CM 185T - The Learning Curve
« Reply #40 on: Nov 17, 2012, 15:54:00 »
Subscribed! Always interested to see these smaller builds!

Offline sxecafe

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CM 185T - The Learning Curve
« Reply #41 on: Jan 22, 2013, 18:22:12 »
It's been a while on this little guy. Now that the 550 has been running (aside from a recent discovery), we are going to put a little bit of time in to this thing.

Got a new harness as I didn't want to continue to trace the mess of wires currently on the bike down. Going to try and start it soon and see if it'll kick over at all.



This one ties in nicely so far. Hoping not to have to fuss with it too much.

Offline sxecafe

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Re: CM 185T - The Learning Curve
« Reply #42 on: Jan 27, 2013, 15:16:12 »
I only had a few hours to spare yesterday so instead of tearing in to the problem with my CB550, I decided to plug up the loom on this little guy. I switch out the old plugs with the new ones I had purchased and that wifey had already put on the old loom. Took about 30 minutes to get all new connectors on there. Then I started to plug everything in. For the most part, everything went off with out a hitch. The only major question I have is about a blue and white wire that the diagram says connects to the starter button.

Here is the diagram and the code is "L/W"



I have a Black and Red/Yellow attached to a two pole starter button. The L/W is said to tie in to the high beam switch on the left side control switch. Any guess as to what this is?

After all that, we tried to fire it up. Sure enough, it cranked!!! No fire though. I traced it down and it seems like the coil is shot. I'm going to test it again today and then see what my options for a new spark set up would be.

Here's the attempt:



Offline sxecafe

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Re: CM 185T - The Learning Curve
« Reply #44 on: Feb 05, 2013, 13:24:52 »
Anyone have experience with these 6V systems? I was working with a multimeter this weekend briefly and couldnt get power to the coil wires (b/w and blue) I could get power to black, y/r and the red wires but not to the coils.

Trying to test the coil and don't know if I'm missing something here...

Offline paddlesat16

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Re: CM 185T - The Learning Curve
« Reply #45 on: Feb 06, 2013, 12:19:24 »
Hi

With a 6v system, you need to make sure all electrical connections are clean including all earths sanded over to make sure that you don't lose any amps with resistance. Because you have so little to work with in the first place. Converting to 12v would make this bike more reliable.

Regards
Current Stable: Honda Superdream CB250ndb, Aprilia Pegaso 650, Suzuki Marauder GZ125
Previous Bikes: Suzuki TS50ER, Yamaha RD125, Yamaha SR125

Offline sxecafe

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Re: CM 185T - The Learning Curve
« Reply #46 on: Feb 06, 2013, 13:28:24 »
I've been considering that. I am getting the thing to crank over though, so I know there is power in there somewhere.

I have to read up on converting to a 12V system. I have a CB100 that would probable need the same treatment.

Offline sxecafe

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Re: CM 185T - The Learning Curve
« Reply #47 on: Apr 14, 2013, 18:17:56 »
Purchased a new coil that came in yesterday. I put it on the bike and tried to get spark with a limited amount of work time. I was unsuccessful but I need to play with it more.

The engine is not cranking over like it was before, though. I have to check the wiring again but I seem to be getting power to all the right places. When I push the starter button, I get 6 volts at both black and y/r. Could the starter itself be bad? How would you test it with only one wire coming out of it...?

Offline sxecafe

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CM 185T - The Learning Curve
« Reply #48 on: Apr 15, 2013, 04:11:51 »
Spent a few minutes testing today. Heres where im at:

- Testing the wires coming out of the ign switch, red is hot and blk is hot with the switch on. That is working properly.

- On the starter solenoid, with positive on the multimeter on the positive of the battery, I have 5.7v coming from the starter wire side of the solenoid as well as 5.7v at where the wire meets the starter. I get no voltage drop when I push the starter button and the black lead is touching the positive terminal on the solenoid (this is what I think the problem is)

- With the ign switch on, y/r wire gets 5.7v when the start switch is pushed in.

- The resistance between the two wires on the solenoid is ~1.1/1.2.

- Lastly, with a lead attached to the positive side of the solenoid, when I touch the other side of that lead to the starter wire, I get a minimal spark but the starter motor doesn't jump.

I think either the solenoid is bad (but can't find readings I need to verify this) or the starter motor needs to be rebuilt. Other than that, the only thing i can think of is the neutral switch. Any thoughts would be appreciated.

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Offline shamus

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Re: CM 185T - The Learning Curve
« Reply #49 on: Apr 15, 2013, 08:43:19 »
Take a jumper cable from the pos battery terminal to the starter motor, bypassing the solenoid. If it turns over, then it's likely the solenoid.
My xs360 build:

http://www.dotheton.com/forum/index.php?topic=37624.msg408051#msg408051

1976 Yamaha XS360
1977 Yamaha TT500