SOHC.co.uk Forums > CB500/550

Can I try to start it yet?

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JustcallmeMrT:
Well, I decided that I'd try to do a test start, and after finally getting the carbs sorted, new plugs, the tank lined, and all the split air box rubbers replaced, I have no juice to the plugs. 
Lame.
To say the wiring harness has been messed with is an understatement, so I think I'm going to give up on the test start and begin to really tear it all apart and rebuild. Hopefully once I get to the stage of having built a new wiring harness, it'll work. 

matthewmosse:
You can test sart the engine on the bench using any 12v battery, a couple of scrap bits of wire and that will be enough to know a fair bit. In the bike it is even easyer to jurry rig power to the coils from the battery supply.

JustcallmeMrT:

--- Quote from: matthewmosse on October 05, 2014, 04:55:05 PM ---You can test sart the engine on the bench using any 12v battery, a couple of scrap bits of wire and that will be enough to know a fair bit. In the bike it is even easyer to jurry rig power to the coils from the battery supply.

--- End quote ---
Well, I'll happily give it a try!  Can you run through a little how - to?

matthewmosse:
Been a while, sure someone will correct any errors. Power from positive of battery (small cable, almost any old bit of vehicle wiring) to black wire (white tracer?) On coils. Blue to blue, yellow to yellow points to coil. Earth via a decent heavy cable to engine bock - a jump lead would do. You can get away with just touching the starter cable end to the battery positive terminal but it will spark.
If you are not getting starter motor and bike is mostly right, I have been known to jam a 10mm spanner across the starter solinoid terminals which can aid bypassing the starter switch if that gives issues. This does spark a bit and kills the spanner, but if the thing won't start and your late for work, it is cheaper than taking the day off.

Bitsa (Ralph Wright - RIP):
Have a look at this topic more or less the same www.sohc.co.uk/index.php/topic,7239.0.html
Cheers
Bitsa

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