Forum

Login

Register

By registering at the KZrider.com community, you agree to the following terms. KZrider.com reserves the right to remove any posting it finds unsuitable. Members who refuse to play by the following rules will be excluded from the discussion board.

PRODUCT OR SERVICE ADVERTISING IS STRICTLY LIMITED
KZrider is more than a website. Its members comprise a community of KZ enthusiasts dedicated to encouraging and preserving our sport and passion for Kawasaki Z, Z1 and KZ motorcycles. We pursue our passion because we enjoy it, not to make money from it. To that end KZrider.com is not a place for you to solicit sales of any kind. No member is allowed to refer to their own business, or any business to which he/she is associated, through the discussion forum or personal messaging system (U2U). Be aware, the U2U feature has been abused in the past. If any member solicits an unwelcomed solicitation through the U2U system please report that solicitation to the Administrator or Moderators promptly.

There are four exceptions to this policy:
1. As permitted in Classifieds (consumer-to-consumer transactions).
2. An item may be offered for sale as a consumer-to-consumer transaction in any forum where there exists reasonable expectation of being welcomed by another member who has previously posted in the thread ("cold calls" and "door-to-door" solicitations are prohibited).
3. Each member is allowed a simple link (somesite.com) in their signature, which link shall include no description of any kind.
4. Paying advertisers are allowed to post in the Vendor forum.

KEEP IT CLEAN
You may not post libelous or defamatory messages or materials, or include links to such materials in your postings. You may not post messages that are obscene, violent, abusive or designed to harass or intimidate another individual. Pornography, Warez, or any other illegal transactions may not be posted or included in members profiles. No blatant nudity.

BE CIVILIZED
Don't use racial, ethnic, or gender slurs, religiously derogatory comments or any other personal discriminations even in jest. Use of slurs needlessly offends people - whether or not they're a member of the group you've insulted. Respect others' religious beliefs and culture. Recognize that others have religious and personal beliefs which may differ from yours. Stay away from political debates. Keep the language and behaviour appropriate.

USE DESCRIPTIVE THREAD TITLES
When you post a new thread, please give users some idea of what it contains in the title. Thread titles like "Help" or "Check this out!" are cheap ways of getting users to look at a thread they might not care about, and would not have clicked on had the full title "Help, I need credit card numbers!" been used. Furthermore, it helps stop multiple threads on the same subject. When starting a new thread, describe the content of your thread clearly in the 'Subject' line of your post. Don't use vague subjects. Use descriptive and specific subject lines. This helps others decide whether your particular words of wisdom relate to a topic they care about. For example: "HELP!!" is not an appropriate subject and neither is "My bike doesn't run".

PLEASE DON'T SHOUT!
That cap lock key wasn't invented to help you get your message across. Messages written in all caps are annoying, hard to read, and loud.

HAS IT BEEN POSTED ALREADY?
Please look for an existing thread on a subject before you post one about it. Chances are good that your question has already been answered. There is a search feature on these forums, use it. Starting topics that have already been answered in great detail is a waste of everyone's time. Look to see if information you're about to post has just been posted by someone else. Then go ahead and post.

WE HAVE SECTIONS FOR A REASON
The Technical Forums have different sections for a reason. If you're not sure, use your best judgment. 

DON'T CROSS-POST
Cross-posting is when you post the same message multiple times in various threads or forums. We only need to see it once guys. 

STAY ON TOPIC
Keep threads on topic. If you've got something completely unrelated to say then start a new thread. Unresponsive solicitations for consumer-to-consumer sale are prohibited as being unrelated and off topic, but solicitations for consumer-to-consumer sale may be posted in Classifieds.

CONSIDER THE IMPACT OF YOUR WORDS BEFORE POSTING
Adhere to the same high standards (or higher) of behaviour online that you follow in real life. In real life, most people are fairly polite and law abiding. The same rules of behaviour are expected on any list.

MESSAGES SHOULD CONTRIBUTE TO THE TOPIC BEING DISCUSSED
or introduce a relevant idea. If you've read enough threads, you've already learned how annoying it is to go through "Me Too" posts. A "Me Too" is a post that says "I agree with what the other guy said" and otherwise does not add to the content. If you have a comment about someone else's post, tell them via U2U or email. Generally speaking, unless it concerns the entire group and is within the group's stated purpose, you should reply only to the author. Avoid replies or responses to the whole list of yes, no, or "I agree!". This is meaningless and you too would be annoyed to open such a message.

WELCOME TO KZRIDER
If you are a new member, introduce yourself by posting to the New Member Forum. While it's nice to welcome a new member, only do so if they have posted in the New Members forum. There is no need for 50 welcome posts in a technical forum thread.

U2U IS A WONDERFUL FEATURE
Please don't start a topic that is directed at one person that could be put into a U2U to them. If you have a message for one or two posters, use U2U or email.

PICTURE PERFECT
Images & attachments may be posted as long as they are not explicive or offensive. Images are limited in size to 2mb. The Project Forum is for members' rides only and is an ideal place to document your rebuild.

FLAME-WARS
Don't even start them, they will be ended, quickly, and you'll find yourself on the short bus. Flaming: Personal attacks in cyberspace can be particularly vicious. Flaming is the rather nasty art of attacking others on a personal level.

  • Register
Welcome, Guest
Username: Password: Remember me

TOPIC: re: kz750 ltd h2 1981- modern tires/pressures

kz750 ltd h2 1981- modern tires/pressures 2 years 9 months ago #501595

  • steelhorseangel
  • steelhorseangel's Avatar
  • OFFLINE
  • Member
  • ad@wildlifeartist.plus.com
  • Posts: 162
  • Thank you received: 1
hi kzr's

please can anyone advise me of the following:-

my kz was designed and built in 1981.
the old compounds for tires in 1981 was inferior
to modern day tire materials. in the owners
manual it states for a single rider the tire pressures
should be:-

front - 25psi
rear- 22psi

q). are these the recommended pressures
even today?

my friend has a current kawasaki z750 and the weight
is similar to my old gal, yet the tire pressures
are a lot higher.

this is a safety question and worries me that
no one seems to know the answer.

thank you so much for helping me!

regards

angel
Angel
Restore, Wrench & Ride!
Brought up with Dad, brother, all riders!
Our Dad (Eric) taught us both simple mechanics
before he went to the happy hunting ground, too soon (44)
My KZ is now called Eric and he will ride and protect me!
x God Bless x
The administrator has disabled public write access.

kz750 ltd h2 1981- modern tires/pressures 2 years 9 months ago #501604

  • bountyhunter
  • bountyhunter's Avatar
  • OFFLINE
  • Member
  • Posts: 6520
  • Thank you received: 250
I think I run about 30 - 32 front, and about 28 rear.

I can't believe 22 psi is right for a rear tire?
1979 KZ-750 Twin
The administrator has disabled public write access.

kz750 ltd h2 1981- modern tires/pressures 2 years 9 months ago #501610

  • 650ed
  • 650ed's Avatar
  • OFFLINE
  • Member
  • Posts: 9714
  • Thank you received: 1207
I don't believe the recommended tire pressures were related to tire compounds being "inferior" in 1981. I say this because the recommended tire pressures in 1977 were much higher on my KZ650-C1 than on your newer bike (see tire pressure label below). Does your bike still have the pressure label under the seat? If the owners manual recommends those low pressures (and they really do seem low to me) maybe it's because of the tire sizes or wheel configuration. You might want to send a couple emails to some tire makers to get their opinion on what pressure you should use with their tires. Ed

tirepressurelabel.JPG
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
The administrator has disabled public write access.

kz750 ltd h2 1981- modern tires/pressures 2 years 9 months ago #501611

  • steelhorseangel
  • steelhorseangel's Avatar
  • OFFLINE
  • Member
  • ad@wildlifeartist.plus.com
  • Posts: 162
  • Thank you received: 1
hi kzr's

thank you for your replies.
my bike is a complete restore, except for the engine.
this a gem of a find 6,600 on a 1981. sadly
no safety labels attached. all powder coated off.

i found the tire pressures from the original owners
manual, page 81.

this is why i'm confused riders!

cheers buddies.

regards.

angel - uk
Angel
Restore, Wrench & Ride!
Brought up with Dad, brother, all riders!
Our Dad (Eric) taught us both simple mechanics
before he went to the happy hunting ground, too soon (44)
My KZ is now called Eric and he will ride and protect me!
x God Bless x
The administrator has disabled public write access.

kz750 ltd h2 1981- modern tires/pressures 2 years 9 months ago #501690

  • bountyhunter
  • bountyhunter's Avatar
  • OFFLINE
  • Member
  • Posts: 6520
  • Thank you received: 250
Just checked the manual on my 1979 KZ750: pressure is 28 psi front, 32 psi rear.
1979 KZ-750 Twin
The administrator has disabled public write access.

- 2 years 9 months ago #501714

  • martin_csr
  • martin_csr's Avatar
  • OFFLINE
  • Member
  • Posts: 3087
  • Thank you received: 322
.
1981 KZ650 Competition, Sports, and Road.
Last Edit: 1 year 9 months ago by martin_csr.
The administrator has disabled public write access.

kz750 ltd h2 1981- modern tires/pressures 2 years 9 months ago #501807

  • SPARKY47
  • SPARKY47's Avatar
  • OFFLINE
  • Member
  • 1980 KZ500 B2
  • Posts: 417
  • Thank you received: 5
My pressures(z500b) front:28psi (dunlop f7)
rear:36-40 (dunlop tt100)
Dry weight 192kg (422 lbs)
At least that's what the factory bible says.

Oh and Martin_csr I think you'll find he's a she. B)
1980 KZ500 B2
Location: Middle England[/b
The administrator has disabled public write access.

kz750 ltd h2 1981- modern tires/pressures 2 years 9 months ago #502016

  • faffi
  • faffi's Avatar
  • OFFLINE
  • Member
  • Posts: 566
  • Thank you received: 37
Current tyres are typically rated with 32 front and 36 PSI rear solo (36/42 for radials) due to more compliant rubber and construction. The higher pressure reduce wear by keeping the tyres cooler. However, the old tyres were generally stiffer in construction and also used less compliant rubber, hence the need for less pressure to ensure sufficient grip and comfort.

Most manufacturers have a fitment guide that also states recommended pressure for any given application.
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
The administrator has disabled public write access.

kz750 ltd h2 1981- modern tires/pressures 2 years 9 months ago #502021

  • steelhorseangel
  • steelhorseangel's Avatar
  • OFFLINE
  • Member
  • ad@wildlifeartist.plus.com
  • Posts: 162
  • Thank you received: 1
dear kzr

thank for your reply!

there is a lot of confusion about tire pressures.
so many conficting answers. too high or too low
makes riding dangerous. i will contact bridgestones
the tire manufacturers.

best wishes

Angel UK
Angel
Restore, Wrench & Ride!
Brought up with Dad, brother, all riders!
Our Dad (Eric) taught us both simple mechanics
before he went to the happy hunting ground, too soon (44)
My KZ is now called Eric and he will ride and protect me!
x God Bless x
The administrator has disabled public write access.

kz750 ltd h2 1981- modern tires/pressures 2 years 9 months ago #502031

  • DoubleDub
  • DoubleDub's Avatar
  • OFFLINE
  • Member
  • Posts: 2676
  • Thank you received: 63
Maybe it's imperial pounds? :P
The administrator has disabled public write access.
Keyword