|
|
Post by triplecraze on Apr 19, 2015 17:42:36 GMT -5
I want to order new ignition coils for my 1975 h1f. Can someone suggest a good replacement ? I have the coils with two wire leads. Wondering if I can use coils with the single wire lead or must I have two wire leads ? Who is selling these coils ? Thanks in advance for your help. Triplecraze
|
|
|
|
Post by III on Apr 19, 2015 18:12:34 GMT -5
|
|
|
|
Post by kaarme on Apr 20, 2015 0:55:57 GMT -5
|
|
|
|
Post by mraxl on Apr 20, 2015 5:51:11 GMT -5
The HVC coil is not designed (per their specs) for the late H1 ignition system. The primary winding resistance should be less than 1 ohm. It may work but not as intended.... likely to overheat and possible damage to CDI over time. The HVC coil is a points ignition coil, likely Suzuki. As far as I know there are no aftermarket replacements available, however, a set of Moped coils with correct primary resistance would be inexpensive and works well. |
|
|
|
Post by toxic76 on Apr 20, 2015 6:46:45 GMT -5
|
|
|
|
Post by mraxl on Apr 20, 2015 8:36:37 GMT -5
damn those HV coils were the ones I bought for my 74 H1. The HV webpage said they were for all H1's. I didn't know about the primary resistance needing to be less than 1 ohm on late model H1's. Most of the mini coils like this one from above have a single wire connector and the 74 H1 stock is wired with 2. How do you wire these mini coils that only have one ? Admittedly wiring is my weakest link. Unfortunately, you cannot always rely on vendor descriptions to be accurate.... many are not! Best to ask when there may be a questionable replacement offered... "Buyer Beware". All ignition coils share the same basic design. There is a primary winding that is fed from an input source (battery voltage for points or CDI pulse). The other end of the primary winding is grounded, either directly or thru points contact. Then there is a secondary winding that normally shares a ground with the primary on one end while the other end is connected to the sparkplug wire. As shown below:  The main difference between ignition coils is the turns ratio between the primary and secondary windings and the impedance (or resistance) of those windings. A points system supplies battery voltage (typically 6v or 12v) as input to the primary. The turns ratio steps up that voltage to a typical 20KV. A CDI system applies 300v (or so) to the primary where the output is stepped up to a typical 30KV. It is obvious that there is a significant difference between the windings of a CDI coil and a points coil. A typical CDI coil will have <1 ohm primary resistance with a secondary resistance of 4.5K ohms. A points coil will have a primary resistance of 4 ohms and secondary of 6.5K. These are typical values and not always the case for all applications. The difference in primary resistance can be crucial to CDI unit health as some (not all) will not tolerate high resistance primary without damage. Stick with OE spec coil primaries! Another design difference is with the ground of the coils. Some coils have the ground attached to the mounting lugs of the coil (one wire system) either internally or external. Others have a second terminal for the ground source (two wire system). If a one wire coil is isolated from ground mounting it can function as a two wire coil with the second wire connected to the mounting lug. In the case of the late H1 models (H1E/F/KH) a two wire system is used where the ground wire is connected to the rotor so only one cylinder will fire at a time. That is the reason for rotor brushes on late H1 systems. If a one wire coil is used in the application without being isolated from frame ground there will be all tree plugs firing at the same time (wasted spark as with Boyer system). The bike will run but with an overtaxed ignition system. The H2/H1D coils are one wire coils with internal ground to mounting lug. The KH400 is a one wire system with an external ground to the mounting lug. This wire can be cut and used as the second terminal making it a two wire system. As you can see there are a few factors to consider when using a non OE coil. Some vendors don't provide enough info to make a good choice while others do. Making a wrong choice can be costly. Hope this elementary explanation helps a little. |
|
|
|
Post by III on Apr 20, 2015 10:03:50 GMT -5
OUTSTANDING explaination Dale, thanks.
|
|
|
|
Post by toxic76 on Apr 20, 2015 12:02:42 GMT -5
Well that's printed out and is going in my manual. I actually understood that. Thanks for taking the time to write that up.
Great resource
Gary
|
|
|
|
Post by toxic76 on Apr 20, 2015 12:40:11 GMT -5
|
|
|
|
Post by triplecraze on Apr 20, 2015 13:50:10 GMT -5
Thank you all for your support to help me replace my h1 coils . Your continued support is very much appreciated
Triplecraze
|
|
|
|
Post by III on Apr 20, 2015 15:36:29 GMT -5
He certainly is Gary..... 
|
|
|
|
Post by toxic76 on Apr 28, 2015 17:48:34 GMT -5
The HVC coil is not designed (per their specs) for the late H1 ignition system. The primary winding resistance should be less than 1 ohm. It may work but not as intended.... likely to overheat and possible damage to CDI over time. The HVC coil is a points ignition coil, likely Suzuki. As far as I know there are no aftermarket replacements available, however, a set of Moped coils with correct primary resistance would be inexpensive and works well. Well I am not going to run the HV Cycle ones. These are the ones I bought from the link above: www.ebay.com/itm/Ignition-Coil-for-Chinese-50cc-110cc-ATV-Dirt-Bike-/160577559926?hash=item25632b1d76#ht_2140wt_758 Well they certainly are mini.  I don't know if the spark plug cap needs to be changed to a non-resistor type, anyone know? I have sent the seller an inquiry Gary |
|
|
|
Post by Jim on Apr 28, 2015 18:11:31 GMT -5
Yes, change it to a non-resistor NGK cap. The seller will have no idea about triples, I'm sure.
|
|
|
|
Post by toxic76 on Apr 28, 2015 19:08:20 GMT -5
Thanks Jim .... good point
I have some non-resistor caps so I will swap them out
|
|
|
|
Post by ballvo on Apr 29, 2015 16:42:54 GMT -5
Well they certainly are mini.
I don't know... With that scale they look to be almost two kilometres long   |
|
