engine no harness how to get it to work ?

kennystclair93 wrote: The motor is going onto a kart project. I Baught the bike with no title and some very sketchy frame work extension work the motor ran fine but leaked gas from the carburator. Now thanks to a buddy of mine who decided to rev it up before shutting it off (knowing that it was open header and shot a flame) has a burnt wiring harness and computer and pretty much everything electrical except the coils. I can get a picture but not for a few days. So by I just need it to run and drive I mean I don't need lights and such because it's going on kart.

Cool...... if you get the Kart going please post some pics and what you had to go through ........ I remember a kart running a 650 BSA motor years ago that ran 13s at 100 MPH if I remember right........ standard size pretty much and shifted real nice .... burn outs and everything at Byron raceway.

I will post pics as the build goes right now we're building the frame to handle the motor. Just hope I can figure something out with the motor. I was hoping that because I only need the bare essentials for the kart I wouldn't need much to run the motor.

It's remotely possible that a PO installed an after-market Dyna-S electronic ignition (which doesn't use the igniter) without bothering to remove the igniter.

May wish to confirm that the ignition at hand is indeed stock with an igniter.

Here's a comparison between the stock ignition with igniter and Dyna-S ignition that doesn't use an igniter.




The Dyna-S also requires higher resistance coils.

The Dyna-S is wired directly to the coils without going through an igniter.

Either ignition could be run as a "dead-loss" system -- in a race, for example -- without any charging system components (i.e., no stator; no rectifier; no voltage regulator), until the battery dies.

Good Fortune!

The Dyna S would be the simplest way all you need is one switched 12V +
and some good coils.

This is whats in my KZ650

Doing research again I found a diagram for a bare essential wiring harness for choppers and other custom stuff and was wondering if it would work for mine instead of buying a new harness just make one. I attached the diagram tell me what you think about it. It shows for lights and stuff but I wouldn't need to include that.

Here's a topic by loudhvx in which he supplies quite a few bare bones wiring diagrams.
The 750H diagram for mattylight in the original topic post would be a very close match to the 81 650-CSR as they have the same ignition & charging systems. I did not check to see if there was one specific to the csr, but it would be nearly identical to that 750.

KZR topic -- 1980 750H bare bones for mattylight by loudhvx

Here's the minimum to run the engine with a kick starter.





Could use an alligator clip to battery positive terminal so that coils are receiving voltage only when engine is running.

If no kick starter, could add starter motor and its associated wiring.

Good Fortune!

The above diagram, with an inline fuse on the battery feed and an on/off kill switch would sufficient.

Most 3 phase regulator/rectifier boxes are interchangeable, or you could run total loss and use a charger on the battery.

Unless burnt to a cinder, test your pick up coils and ignition coils with a meter, the IC box is best tested by running it, you might get away with new block connectors and a one-off stripped down wiring loom.