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-   -   Denso ignition coil info? (http://www.rcuniverse.com/forum/engine-conversions-92/1777177-denso-ignition-coil-info.html)

rwilder91 05-01-2004 04:40 PM

Denso ignition coil info?
I've been looking for ignition coils suitable for scratch-built CDI so I stopped by a local motorcycle shop and asked if they had anything in the junk bin. The friendly guy behind the counter tossed me a used DENSO 129700 "stick coil". It's a cylinder about 0.75" dia by 3" long and weighs 3.5 oz. I'll wire it up and try it with a Ryobi 31cc.

Anyone have any more technical data on these puppies? Wiring diagram? Coil resistance & inductance? etc.

Thanks, Dick.

Antique 05-02-2004 08:53 AM

RE: Denso ignition coil info?
Dick,,,, Please keep us posted with your results using the Denso "stick coil". Lots of us are interested ! Antique

wvarn1957 05-02-2004 10:14 AM

RE: Denso ignition coil info?
Denso 129700 ignition coil is made by Nippon Denso. Used in several makes of motorcycles including Kiwasaki, Yamaha, Bugati and probably others.

Denso 129700-4000 (JO400 10D09)
- 4.7 Ohm primary resistance
- 17.4 kOhm secondary resistance

New coil prices are in the $40-$50 range. It still looks as if the best deal is the coil from CH.

Antique 05-02-2004 12:07 PM

RE: Denso ignition coil info?
Your right CH is still the best deal, their coil is well proven. However, the question remains, Does the DENSO coil work ? Tinkerers the world over need to know !

fokker38cc 05-03-2004 08:39 AM

RE: Denso ignition coil info?
Yes , it work
I bought a new TEC coil , made in taiwan,original replacement for Honda TRansalp 600 and I blieve Honda XR 250 and Honda XR 600.
I am tested in the bench, more than 6 hours, 4 hours non interrupted , simulating the hall effect pulses at more than 4000 rpm and no problems, with a new plug.
The circuitry can drive the coil more than 9000 rpm .
Other new coil flew without problems with a weedeater 18 cc ( other TEC )
Other coil , old recycled TEC, but made in japan work well.
No problems with noise, wound a recycled copper braid from a RG213 coax cable over the high voltage lead and work.
Have good luck

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