Author Topic: Transistorized Ignitions, aka Hondaman Ignition in Dual, Single, and now Triple!  (Read 70402 times)

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Offline HondaMan

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Mark, do you recommend a specific pair of coils to your ignition?  Cheaper and better than Dyna would be fine ;)
To CB750 K2 mostly, bigger bore with higher CR, ported head, cam like RC295, MIKUNI VM29 smoothbore.
I guess an OEM 736 Honda will have same need.

I have currently Dyna 5 ohm coils in my modified K6 together with your ignition.
One weak point is the auto type ign wire connection in the Dyna coil, it can move out and cause intermittent functionality. Need to add a "wire holder" very close to the coils outputs.

- Complete package, ign module and coils?

I've had real good luck with the Sakura coils, sold by PartsNmore (#17-6823), which are nearly identical to the post-1975 coils (4.3 ohm primary, but almost 15kV spark instead of TEC's 8kV spark). They have a long duration like the TEC coils did, but they do have odd wire colors: only Black and Blue. They don't care which way the wires are connected: their existing bullet connectors are backward to the Honda harness, easily fixed with new bullet connectors, though. They fit right in, too!
The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: http://forums.sohc4.net/index.php?topic=65293.0

Link to website: www.SOHC4shop.com

Offline theriddler

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  • 1976 CB750F1
Hi Mark,
My transistorised unit now fitted and working well. Everything fitted well. On my CB750F1 I cable tied the box to the back of the battery cage (between the battery and the rear mudguard), with the cables sticking out on the oil tank side of the bike. Snug fit but seems good. Thanks a lot for this unit! Much appreciated...

Offline cumber

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+1

I am very satisfied with the transistorized ignition (and the keyswitch saver).
Start up is much easier, runs smoother and I even have idle now.
Thanks once again!

Offline PeWe

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Mark, do you recommend a specific pair of coils to your ignition?  Cheaper and better than Dyna would be fine ;)
To CB750 K2 mostly, bigger bore with higher CR, ported head, cam like RC295, MIKUNI VM29 smoothbore.
I guess an OEM 736 Honda will have same need.

I have currently Dyna 5 ohm coils in my modified K6 together with your ignition.
One weak point is the auto type ign wire connection in the Dyna coil, it can move out and cause intermittent functionality. Need to add a "wire holder" very close to the coils outputs.

- Complete package, ign module and coils?

I've had real good luck with the Sakura coils, sold by PartsNmore (#17-6823), which are nearly identical to the post-1975 coils (4.3 ohm primary, but almost 15kV spark instead of TEC's 8kV spark). They have a long duration like the TEC coils did, but they do have odd wire colors: only Black and Blue. They don't care which way the wires are connected: their existing bullet connectors are backward to the Honda harness, easily fixed with new bullet connectors, though. They fit right in, too!
I got a pair of coils delivered today. Could not resist the price and good shipping with customs prepaid which save the customs fee of 15-20 USD
http://www.ebay.com/itm/391847597250
I'll make a cable holder so the ignition wires cannot come loose which has happened some times with my existing Dyna coils
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline HondaMan

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Mark, do you recommend a specific pair of coils to your ignition?  Cheaper and better than Dyna would be fine ;)
To CB750 K2 mostly, bigger bore with higher CR, ported head, cam like RC295, MIKUNI VM29 smoothbore.
I guess an OEM 736 Honda will have same need.

I have currently Dyna 5 ohm coils in my modified K6 together with your ignition.
One weak point is the auto type ign wire connection in the Dyna coil, it can move out and cause intermittent functionality. Need to add a "wire holder" very close to the coils outputs.

- Complete package, ign module and coils?

I've had real good luck with the Sakura coils, sold by PartsNmore (#17-6823), which are nearly identical to the post-1975 coils (4.3 ohm primary, but almost 15kV spark instead of TEC's 8kV spark). They have a long duration like the TEC coils did, but they do have odd wire colors: only Black and Blue. They don't care which way the wires are connected: their existing bullet connectors are backward to the Honda harness, easily fixed with new bullet connectors, though. They fit right in, too!
I got a pair of coils delivered today. Could not resist the price and good shipping with customs prepaid which save the customs fee of 15-20 USD
http://www.ebay.com/itm/391847597250
I'll make a cable holder so the ignition wires cannot come loose which has happened some times with my existing Dyna coils

I think you'll like those coils, PeWe: I once rebuilt a K6 that had some really fancy, shielded, flaming red metallic, custom-fitted spark wires from those coils. The wires each had a ground lug from the shield that was cut thru the jacket to the shield in just the right spot to use a cam cover screw to hold them down. The [previous] owner said the wires were almost $200 (ouch!), but looked cool. The new owner wanted a showroom-resto, though, so those are in a box in his garage in California somewhere, today(!).
The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: http://forums.sohc4.net/index.php?topic=65293.0

Link to website: www.SOHC4shop.com

Offline PeWe

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Mark, do you recommend a specific pair of coils to your ignition?  Cheaper and better than Dyna would be fine ;)
To CB750 K2 mostly, bigger bore with higher CR, ported head, cam like RC295, MIKUNI VM29 smoothbore.
I guess an OEM 736 Honda will have same need.

I have currently Dyna 5 ohm coils in my modified K6 together with your ignition.
One weak point is the auto type ign wire connection in the Dyna coil, it can move out and cause intermittent functionality. Need to add a "wire holder" very close to the coils outputs.

- Complete package, ign module and coils?

I've had real good luck with the Sakura coils, sold by PartsNmore (#17-6823), which are nearly identical to the post-1975 coils (4.3 ohm primary, but almost 15kV spark instead of TEC's 8kV spark). They have a long duration like the TEC coils did, but they do have odd wire colors: only Black and Blue. They don't care which way the wires are connected: their existing bullet connectors are backward to the Honda harness, easily fixed with new bullet connectors, though. They fit right in, too!
I got a pair of coils delivered today. Could not resist the price and good shipping with customs prepaid which save the customs fee of 15-20 USD
http://www.ebay.com/itm/391847597250
I'll make a cable holder so the ignition wires cannot come loose which has happened some times with my existing Dyna coils

I think you'll like those coils, PeWe: I once rebuilt a K6 that had some really fancy, shielded, flaming red metallic, custom-fitted spark wires from those coils. The wires each had a ground lug from the shield that was cut thru the jacket to the shield in just the right spot to use a cam cover screw to hold them down. The [previous] owner said the wires were almost $200 (ouch!), but looked cool. The new owner wanted a showroom-resto, though, so those are in a box in his garage in California somewhere, today(!).

Hi Mark,
I use this wire today with Dyna coils and your ignition module
http://www.gsparkplug.com/7mm-ht-ignition-lead-cable-high-resistance-kevlar-core-high-temp-cable-red.html
I got the idea that a wire wound conductor will suppress disturbances in a good way and work fine with your ignition module.
I have std black cu wire I can cut in correct lenghts and add NGK 5 kohm caps as the other.
http://www.gsparkplug.com/7mm-ht-ignition-lead-cable-tinned-copper-core-lucas-hypalon-black.html

These coils will hopefully get a Hondaman ignition module too.
You have in stock? Please prepare one to be shipped to Sweden :)
//Per
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline HondaMan

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Mark, do you recommend a specific pair of coils to your ignition?  Cheaper and better than Dyna would be fine ;)
To CB750 K2 mostly, bigger bore with higher CR, ported head, cam like RC295, MIKUNI VM29 smoothbore.
I guess an OEM 736 Honda will have same need.

I have currently Dyna 5 ohm coils in my modified K6 together with your ignition.
One weak point is the auto type ign wire connection in the Dyna coil, it can move out and cause intermittent functionality. Need to add a "wire holder" very close to the coils outputs.

- Complete package, ign module and coils?

I've had real good luck with the Sakura coils, sold by PartsNmore (#17-6823), which are nearly identical to the post-1975 coils (4.3 ohm primary, but almost 15kV spark instead of TEC's 8kV spark). They have a long duration like the TEC coils did, but they do have odd wire colors: only Black and Blue. They don't care which way the wires are connected: their existing bullet connectors are backward to the Honda harness, easily fixed with new bullet connectors, though. They fit right in, too!
I got a pair of coils delivered today. Could not resist the price and good shipping with customs prepaid which save the customs fee of 15-20 USD
http://www.ebay.com/itm/391847597250
I'll make a cable holder so the ignition wires cannot come loose which has happened some times with my existing Dyna coils

I think you'll like those coils, PeWe: I once rebuilt a K6 that had some really fancy, shielded, flaming red metallic, custom-fitted spark wires from those coils. The wires each had a ground lug from the shield that was cut thru the jacket to the shield in just the right spot to use a cam cover screw to hold them down. The [previous] owner said the wires were almost $200 (ouch!), but looked cool. The new owner wanted a showroom-resto, though, so those are in a box in his garage in California somewhere, today(!).

Hi Mark,
I use this wire today with Dyna coils and your ignition module
http://www.gsparkplug.com/7mm-ht-ignition-lead-cable-high-resistance-kevlar-core-high-temp-cable-red.html
I got the idea that a wire wound conductor will suppress disturbances in a good way and work fine with your ignition module.
I have std black cu wire I can cut in correct lenghts and add NGK 5 kohm caps as the other.
http://www.gsparkplug.com/7mm-ht-ignition-lead-cable-tinned-copper-core-lucas-hypalon-black.html

These coils will hopefully get a Hondaman ignition module too.
You have in stock? Please prepare one to be shipped to Sweden :)
//Per

Sure, I'll put one on the Tester for you!
Those red wires look a lot like the ones I took off the K6 resto that I did last year. The "ground clamps" that were added to it were touching the shield and were crimped onto the bared shield at those sites. It looked like someone took a lot of time to make it: they even covered over the ground clips with clear shrink tubing, cutting it away on the bottom side so it could contact the cam cover with the screw. Nicely done!
The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: http://forums.sohc4.net/index.php?topic=65293.0

Link to website: www.SOHC4shop.com

Offline dcalvert

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My question is can a test light still be used to set the timing after the transistorized ignition has been installed?

dcalvert

Offline PeWe

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I do not remember how I did. Maybe with Hondamans ignition connected or the blue and yellow wires disconnected when measured with a multimeter ohm or buzzer to see and hear when the points (F) match the case mark.

I use the strobe lamp most of the time. Points gap with dwell meter which makes it easier to set it correctly and both points equal. I aim for smallest gap, 23 degrees at 8 cyl dwell setting.  High idle around 1500-2000 rpm, adjust when engine is running a get a live value.

This makes it easier to make the timing adjustment possible. End up in not enough groove in point plate is typical for wrong gap.
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline dcalvert

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Thank you for the input, I installed this a few weekends ago and also change point condensers act with NOS Genuine parts. This week end I hope to get the bike restarted. When I tried last time just got a backfire. Trying to get timing close so she will fire and fine tune it.
dcalvert

Offline PeWe

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Typical for points is that the ignition will not line up (F ' and case mark), but after fiddling around with point gap and baseplate twisting + 2-3 point  adj it will suddenly line up as it must.

Hondaman recommended me to use new points the old way without the module so the protective surface on points will get burnt away before installing the ign module. For around 100 miles or so...
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline HondaMan

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My question is can a test light still be used to set the timing after the transistorized ignition has been installed?

dcalvert

The Transistor Ignition only puts out about 50mA of current (0.050 amp), so most static lights will not light up very much.
But - you can just plug the points directly to the coils while setting the timing statically, then just re-plug the box's wires back in afterward. The timing will not change.
The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: http://forums.sohc4.net/index.php?topic=65293.0

Link to website: www.SOHC4shop.com

Offline HondaMan

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  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road

Hondaman recommended me to use new points the old way without the module so the protective surface on points will get burnt away before installing the ign module. For around 100 miles or so...

That's exactly right, PeWe: there is a waxy, stubborn coating on these points that is almost impossible to fully clean off, and it can cause misfire with the box on brand-new points. Since the dawn of points, we were all supposed to clean this stuff off first, as it can accelerate pitting. But with this box added, it actually INHIBITS the contacts almost completely. The arcing that is normal with coils and points is gone with the box, so this coating doesn't go away easily.

To solve it, I've had riders with new points just set them up directly with their coils, then run the bike about 100 miles or so to do these 2 things: first, it burns off the coating completely (with the arcing) and secondly, the arcing final-welds the tungsten plating to the copper substrate of the points themselves. In years gone by, our points were made with solid tungsten pads that were welded to the points arms: today they are copper pads with about 0.040" thick tungsten PLATING, instead. These are not perfectly mated (as plating never does), so the arcing will finish this job and make them work perfectly with the Transistor Ignition, and for a VERY, VERY long time with no further adjustments.
;)
The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: http://forums.sohc4.net/index.php?topic=65293.0

Link to website: www.SOHC4shop.com

Offline FunJimmy

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I really need to get me one of these.
You never see a motorcycle parked outside of a psychiatrist's office!

CB550 Cafe Interceptor a Gentlemans Roadster
http://forums.sohc4.net/index.php?topic=27159.0

Offline PeWe

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I got one today!
My second unit, now for this winter project hopefully running next spring.
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

 

;
Honda