Author Topic: H4 LED bulb fitment, bucket deep enough or modify?  (Read 1878 times)

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Offline PeWe

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #25 on: January 14, 2026, 08:09:20 PM »
The new lamp need a longer ride to verify if it will work fine.
Next gadget a temp sensor  inside  bucket that switch off at around 70*C ? ;D

Or lit an alarm. Sudden no light in the dark is not fun.
I have survived that in Italy,  a bad battery that caused no light under 4000rpm.
« Last Edit: January 14, 2026, 08:12:57 PM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Tim2005

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #26 on: January 28, 2026, 02:32:17 PM »
Did you get anywhere with that bulb yet? I've been fitting the Philips bulb in the photo to my Guzzi, after an unsuccessful try of a full LED unit. This bulb has the blue braided metal ribbons to aid heat dispersal. As a test, I attached it to a battery and left it going on the workbench for half an hour or more. The silver base of it and the ribbons all felt hand-hot at that time, and my infra-red thermometer registered just under 60 degrees C.

It's a good bulb and works really well, but I'd prefer one like yours without the ribbons as there's a big rubber cover to weatherproof it a bit that they get in the way of.

Offline willbird

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #27 on: January 28, 2026, 02:50:51 PM »
Not sure what's different about European bike electrical system, but I'd like to be able to use my heated gloves. Today was below freezing and dark both ways, almost 4 hours riding. I had to intentionally catch a couple red lights along the way to warm my hands, fingers crossing between pain and numb so was getting sketchy. It was worse in the morning I took the highway half the ride and could only warm my left hand. I dislike the struggle with heated gloves not being as insulated and only giving off appreciable heat at middle RPM so tend to stick with Held thick winter gloves.



I looked a bit at the  LiFePO4 Battery, GOLDENMATE 12V 16Ah LiFePO4 Battery on Amazon as an example, would run all my heated gear on the CB750K2 maybe an hour wide using it's own separate dedicated circuit. Weights 4lbs, one need a charger for them though. I think my gloves, pants, and jacket liner all added up to maybe 16A maximum....that battery says max output 15A.

Bill

Offline grcamna2

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #28 on: January 28, 2026, 10:20:06 PM »
a large battery,seems best.
75' CB400F/'bunch o' parts'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline willbird

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #29 on: January 29, 2026, 08:22:30 AM »
a large battery,seems best.

Setup to fasten the a luggage rack might be nice, those things make me wary of burying them inside a bike somewhere you cannot yank them out of if they decide to become their own funeral pyre.

Bill

Offline PeWe

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #30 on: January 29, 2026, 08:31:31 AM »
About my new LED H4. I'll report in April after a long ride.

Maybe I'll add a temp sensor inside to know if there is a risk for wire melt down.;D

Connect something like this on the 12V feed to LO. Strap it against the LED bulb cooling flanges.
If it will open in darkness, I can switch to Hi.
I have got the warning.

Bimetallic thermostat opens at 100C, closes at 85C

https://www.elfa.se/sv/bi-metallic-thermostat-opens-at-100-closes-at-85-150-max-no-automatic-reset-fixed-mount-rs-pro-2228257/p/30475791


« Last Edit: January 29, 2026, 08:51:09 AM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline grcamna2

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #31 on: January 29, 2026, 10:09:01 AM »
a large battery,seems best.

Setup to fasten the a luggage rack might be nice, those things make me wary of burying them inside a bike somewhere you cannot yank them out of if they decide to become their own funeral pyre.

Bill

I'm able to fit this size Yuasa battery into a bike which used a YB14L-A2,even though it's 11/16" longer. The bike's battery that I use this in slides in sideways,so this powerful Yuasa AGM battery #YTX14H-BS measures 6" L.(x 3 7/16"Wx5 3/4"H),compared to the stock battery YB14L-A2(190CCA)which is 5 5/16"L x 3 1/2"W x 6 9/16"H;I don't know if you can modify the length of your battery box for it to fit,long way. The width and height will certainly fit.
The battery sticks out the side a little further,and the rubber strap is able to stretch a bit more to fit.
This YTX14H-BS is manufactured in the USA using virgin lead.
The only other thing different about it(1/2 a pound heavier)is the Pos+ and Neg- posts are opposite each other,compared to your stock YB14L-A2;but because it's an AGM w/o a vent tube,I was able to turn it 180 & stretch my cables to fit,as it's posts sit-up just a little higher than the case:I paid $150 for it,including the 6-pack of special acid to activate it,when ready.
« Last Edit: January 29, 2026, 05:49:11 PM by grcamna2 »
75' CB400F/'bunch o' parts'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline HondaMan

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #32 on: January 29, 2026, 10:24:00 AM »


I would rather be able to use all my heated gear but that is a 15A load :-). Have thought about buying a 20 amp hour LifePO4 battery just to run the heated gear on my CB750K2 $45 and 6lbs, would just run it as total loss in it's own system for just the heated gear, re charge after the ride.

Bill
Hmmm. Good idea Bill.
+1

Although, discussing a large battery reminds me of the time I had to go buy a car battery for my old Dodge Dart, bringing it home strapped onto my luggage rack. That was an interesting trip home!
« Last Edit: January 29, 2026, 10:26:58 AM by HondaMan »
See SOHC4shop.com for info about the gadgets I make for these bikes.

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Offline Kelly E

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #33 on: January 29, 2026, 12:43:09 PM »
It must have been a bit light in the front. :o
I once had to ride my 300lb friend home after his bike died. My 82' Honda V45 Sabre was mostly bottomed out the whole way. I weighed 122lbs, I was constantly telling him to quit moving around. He was more in control than me the whole way. 8)
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1974 Honda CB 550 K0                                            1971 MGB/GT
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1977 Kawasaki KZ 1000 LTD                                   1985 GMC S15
1978 Kawasaki KL 250
1980 Suzuki GS 1100E
1983 Honda CB 1100F
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Offline jonda500

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #34 on: January 29, 2026, 03:47:18 PM »
Back in the eighties I road my 400-4 around for a week with a car battery tied to the back of the seat and wired to the battery leads till I got a new battery.
That wasn't as sketchy as my Friday arvo / Monday morning trips from and to Slaven Mazda with my full mechanics tool kit tied behind me! Over bumps it used to slam me in the back. Australian models don't have grab rails so everything had to be tied to the blinkers making it far from secure!
John
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Offline Deltarider

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #35 on: January 30, 2026, 08:49:40 AM »
a large battery,seems best.
May I ask why?
I also read your next reply #31. Good Lord, what a hassle all in all and then 3 times the price of a standard battery, $ 150,- for all this extra work and handicaps. Gotta admire your perseverance.  ;D
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Offline grcamna2

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #36 on: January 30, 2026, 11:08:13 AM »
a large battery,seems best.
May I ask why?
I also read your next reply #31. Good Lord, what a hassle all in all and then 3 times the price of a standard battery, $ 150,- for all this extra work and handicaps. Gotta admire your perseverance.  ;D

This Yuasa YTX14H-BS is superior quality,when compared with a standard(off the shelf)generic 14L-A2 flooded cell battery;this Yuasa model has proven to have extended longevity.
75' CB400F/'bunch o' parts'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline willbird

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #37 on: January 30, 2026, 11:22:08 AM »
a large battery,seems best.
May I ask why?
I also read your next reply #31. Good Lord, what a hassle all in all and then 3 times the price of a standard battery, $ 150,- for all this extra work and handicaps. Gotta admire your perseverance.  ;D

For $50 I can buy a battery with enough capacity to run all my heated gear for an hour, and potentially said battery could be carried in my Windjammer II fairing. The electrical circuit would not be tied into the bike in any way. The battery would cost $46, not sure on charger, have not studied the tech. Seems way simpler than trying to get an extra 16A out of the existing 1972 charging system.

Bill

Offline grcamna2

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #38 on: January 30, 2026, 11:25:43 AM »
a large battery,seems best.
May I ask why?
I also read your next reply #31. Good Lord, what a hassle all in all and then 3 times the price of a standard battery, $ 150,- for all this extra work and handicaps. Gotta admire your perseverance.  ;D

For $50 I can buy a battery with enough capacity to run all my heated gear for an hour, and potentially said battery could be carried in my Windjammer II fairing. The electrical circuit would not be tied into the bike in any way. The battery would cost $46, not sure on charger, have not studied the tech. Seems way simpler than trying to get an extra 16A out of the existing 1972 charging system.

Bill

A deep cycle battery,got a picture ?
75' CB400F/'bunch o' parts'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline willbird

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #39 on: January 30, 2026, 11:29:51 AM »
a large battery,seems best.
May I ask why?
I also read your next reply #31. Good Lord, what a hassle all in all and then 3 times the price of a standard battery, $ 150,- for all this extra work and handicaps. Gotta admire your perseverance.  ;D

For $50 I can buy a battery with enough capacity to run all my heated gear for an hour, and potentially said battery could be carried in my Windjammer II fairing. The electrical circuit would not be tied into the bike in any way. The battery would cost $46, not sure on charger, have not studied the tech. Seems way simpler than trying to get an extra 16A out of the existing 1972 charging system.

Bill

A deep cycle battery,got a picture ?

Was going to add edit but I can put it here. My NOCO Genius of which I have several will charge it.

Here is the battery, all of my gear is 16A maximum and I doubt it draws that unless gloves, jacket liner, and pants liner were wide open, the linked battery is good for 15A.
https://a.co/d/gQ5tLoj

Bill

Offline grcamna2

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #40 on: January 30, 2026, 11:39:25 AM »
a large battery,seems best.
May I ask why?
I also read your next reply #31. Good Lord, what a hassle all in all and then 3 times the price of a standard battery, $ 150,- for all this extra work and handicaps. Gotta admire your perseverance.  ;D

For $50 I can buy a battery with enough capacity to run all my heated gear for an hour, and potentially said battery could be carried in my Windjammer II fairing. The electrical circuit would not be tied into the bike in any way. The battery would cost $46, not sure on charger, have not studied the tech. Seems way simpler than trying to get an extra 16A out of the existing 1972 charging system.

Bill

A deep cycle battery,got a picture ?

Was going to add edit but I can put it here. My NOCO Genius of which I have several will charge it.

Here is the battery, all of my gear is 16A maximum and I doubt it draws that unless gloves, jacket liner, and pants liner were wide open, the linked battery is good for 15A.
https://a.co/d/gQ5tLoj

Bill

4lbs and will fit into a Windjammer pocket,for a reasonable price.
Do they design this type to release power until the battery is down to 11vts,before recharging it at home ?
75' CB400F/'bunch o' parts'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline willbird

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #41 on: January 30, 2026, 12:13:23 PM »
a large battery,seems best.
May I ask why?
I also read your next reply #31. Good Lord, what a hassle all in all and then 3 times the price of a standard battery, $ 150,- for all this extra work and handicaps. Gotta admire your perseverance.  ;D

For $50 I can buy a battery with enough capacity to run all my heated gear for an hour, and potentially said battery could be carried in my Windjammer II fairing. The electrical circuit would not be tied into the bike in any way. The battery would cost $46, not sure on charger, have not studied the tech. Seems way simpler than trying to get an extra 16A out of the existing 1972 charging system.

Bill

A deep cycle battery,got a picture ?

Was going to add edit but I can put it here. My NOCO Genius of which I have several will charge it.

Here is the battery, all of my gear is 16A maximum and I doubt it draws that unless gloves, jacket liner, and pants liner were wide open, the linked battery is good for 15A.
https://a.co/d/gQ5tLoj

Bill

4lbs and will fit into a Windjammer pocket,for a reasonable price.
Do they design this type to release power until the battery is down to 11vts,before recharging it at home ?

Not sure yet, they do also offer a 2 pack of 10A ones that would let us throw one in each side and I think deliver 20A ? The two pack was  $55? The linked one says it has some stuff like you mention included maybe.
Quote
NERMAK LiFePO4 battery has built-in BMS protection to prevent overcharge, Over-discharge, Over-current and short circuit, and excessive low self-discharge rate ensuring up to 1-year maintenance-free storage.

Here is the 2 pack
https://a.co/d/bHtp5VN

Bill

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #42 on: January 30, 2026, 12:27:41 PM »
The amp-hour rating of a battery is time related, and as the rate of discharge increases, the capacity decreases, according to Peukert's law. If a battery has a 16 amp-hour capacity at a 10 hour rate, that means it can supply 1.6 amps for 10 hours, not 16 amps for 1 hour.
When I got my first LiFe battery 15 years ago, I bench tested it. It was claimed to be a 4 amp-hour battery, but with a 4 amp load, it took about 20 minutes to discharge to 12.0 volts, and then the voltage dropped like a rock within seconds.
« Last Edit: January 30, 2026, 12:32:22 PM by scottly »
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Offline willbird

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #43 on: January 30, 2026, 12:53:52 PM »
The amp-hour rating of a battery is time related, and as the rate of discharge increases, the capacity decreases, according to Peukert's law. If a battery has a 16 amp-hour capacity at a 10 hour rate, that means it can supply 1.6 amps for 10 hours, not 16 amps for 1 hour.
When I got my first LiFe battery 15 years ago, I bench tested it. It was claimed to be a 4 amp-hour battery, but with a 4 amp load, it took about 20 minutes to discharge to 12.0 volts, and then the voltage dropped like a rock within seconds.

Hmm well the seller has a different birth language than the one we are typing but they say "Continue Discharge Current   10A" for each of the batteries included in the two pack.

Online scottly

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #44 on: January 30, 2026, 12:56:19 PM »


Hmm well the seller has a different birth language than the one we are typing but they say "Continue Discharge Current   10A" for each of the batteries included in the two pack.
For how long?? ;)
Don't fix it if it ain't broke!
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Offline willbird

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Re: H4 LED bulb fitment, bucket deep enough or modify?
« Reply #45 on: January 30, 2026, 01:01:22 PM »


Hmm well the seller has a different birth language than the one we are typing but they say "Continue Discharge Current   10A" for each of the batteries included in the two pack.
For how long?? ;)

they say.............

Quote
Continue Discharge Current   10A
Peak discharge current   20A (Duration: less than 5 seconds)

I read that as "10A until the protection circuit says no more Ah avail". General info on the web for  LiFePO4 shows voltage relatively flat until the last 20% avail.

As I said new tech for me so I'm learning lots ;-).
https://appbattery.com/wp-content/uploads/2023/12/3.2-lifepo4-cell-voltage-chart.jpg
« Last Edit: January 30, 2026, 01:06:56 PM by willbird »