Author Topic: unleaded fuel  (Read 1104 times)

0 Members and 1 Guest are viewing this topic.

Offline Bazzer

  • Full Member
  • *
  • Posts: 22
unleaded fuel
« on: December 27, 2018, 11:27:05 am »
Do the 750A's run ok on unleaded, i have a 1978 model.the owners manual says non lead gasoline is not recomended. I live in the UK and the bike is not registered here yet , i have only had it running in the shed. Any thoughts would be good.

Offline Old Moe Toe

  • Hot Shot
  • ***
  • Posts: 534
Re: unleaded fuel
« Reply #1 on: December 27, 2018, 04:58:49 pm »
Can't you get a hold of the additive that comes in a small container that you put in with the unleaded fuel when you fill up. I use it for my older bikes.

Offline Jerry Rxman Griffin aka MuthaF'er

  • This MuthaF'er is getting to be a
  • Really Old Timer ...
  • *******
  • Posts: 14,293
  • Bought her new 4/75
Re: unleaded fuel
« Reply #2 on: December 27, 2018, 07:17:14 pm »
They all will run on unleaded
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Bazzer

  • Full Member
  • *
  • Posts: 22
Re: unleaded fuel
« Reply #3 on: December 29, 2018, 01:57:57 pm »
I have that additive that is added to the fuel, I just wanted to know how people get on using unleaded fuel . for example , do their exhaust down pipes go blue, ( very unusual for a honda ) indicating running too hot.

Offline jukku

  • Enthusiast
  • **
  • Posts: 172
  • Happy with my Hondamatic
Re: unleaded fuel
« Reply #4 on: December 30, 2018, 07:59:50 am »
All Honda bikes, as standard since 1972, run on unleaded fuel 95 octan RON!

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 10,313
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: unleaded fuel
« Reply #5 on: December 30, 2018, 07:52:42 pm »
The valve guides in the 750A (and all these bikes) are cast iron. This wears with the lack of lead in the fuel. To counter it, use 1-2 ounces of oil in each tank of gas. If you can find the synthetic type of 2-stroke oil for this, it will not smoke, either (that's what I've used for a LONG time). This will extend the life of the valve guides for nearly original life. If you go into the engine, get bronze guides installed to solve this problem, it works fine.
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: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline Marks78

  • Enthusiast
  • **
  • Posts: 102
Re: unleaded fuel
« Reply #6 on: January 02, 2019, 07:57:20 am »
So -- instead of adding 2 stroke or regular oil to the fuel, could a person use a product like a ZDDP additive (added to the oil) and get the same benefits?? 
Current Stable:
1978 CB750K
1982 XT200J
1982 XJ1100 Maxim
1985 V30 Magna
1998 VT1100 Spirit
2006 GoldWing

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 10,313
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: unleaded fuel
« Reply #7 on: January 02, 2019, 05:19:16 pm »
So -- instead of adding 2 stroke or regular oil to the fuel, could a person use a product like a ZDDP additive (added to the oil) and get the same benefits??

That only works for the intake valve. The exhaust valves rely entirely on lube in the exhaust gases (which used to be hot lead) and the 2-stroke oils do not fully burn when used in these engines. In some places you can get "upper cylinder lubricant" (aka 'top oil') that goes into the gas, but in the USA this was banned by the liberals in 2002. So, we use real oil instead.
;)
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: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline Maraakate

  • Hot Shot
  • ***
  • Posts: 291
Re: unleaded fuel
« Reply #8 on: August 14, 2020, 07:10:40 pm »
So -- instead of adding 2 stroke or regular oil to the fuel, could a person use a product like a ZDDP additive (added to the oil) and get the same benefits??

That only works for the intake valve. The exhaust valves rely entirely on lube in the exhaust gases (which used to be hot lead) and the 2-stroke oils do not fully burn when used in these engines. In some places you can get "upper cylinder lubricant" (aka 'top oil') that goes into the gas, but in the USA this was banned by the liberals in 2002. So, we use real oil instead.
;)

Old thread, but are you referring to the Lucas Upper Cylinder Lubricant?  You can still buy that in the US.
1977 CB550K
1979 CM400A

Offline Randy Nevrotski

  • Randy
  • Full Member
  • *
  • Posts: 32
  • ITS AUTO-MAD-TIC
Re: unleaded fuel
« Reply #9 on: August 26, 2020, 08:23:25 pm »
what about mastery oil
1976 CB750A & Other bikes 1980 KZ 650 cafe racer 87 ZX750R NINJA 2001 KATANA 600 1983 GPz 750 1980 CB750 CUSTOM Past bikes 1974 suzuki GT750 TRIPLE Care Free Custom chopper 117 motor 95 Honda XR650L Dual Sport 87 ZX600R NINJA Honda CB550FOUR 87 Yamaha 225 trike honda 250R trike RM80 HONDA TRAIL CT70

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 10,313
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: unleaded fuel
« Reply #10 on: September 11, 2020, 06:14:22 pm »
what about mastery oil
If you're referring to Marvel Mystery Oil: that is a highly-detergent oil used to remove deposits on valve faces and piston crowns in a hot engine. It works well for that, but doesn't lube the valve stems very well when running.

Just add a little 'normal' or 2-stroke oil to the fuel in the tank: that works well. Modern 2-stroke oil doesn't smoke much, either.
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: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com