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Tiger73
Tiger73
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fork oil. #128915
11/18/07 3:45 am
11/18/07 3:45 am
Joined: Aug 2006
Posts: 258
half moon bay, ca
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dan charles tr6r Offline OP
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dan charles tr6r  Offline OP
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Joined: Aug 2006
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half moon bay, ca
i have a 1970 tr6.whats the best stuff i can put in my fork tubes? what is the best stuff for the 1970 front end? Dan

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Re: fork oil. #128916
11/18/07 11:42 am
11/18/07 11:42 am
Joined: Jul 2007
Posts: 594
australia
6
649 Offline
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Joined: Jul 2007
Posts: 594
australia
engine oil....anything else is too light...originally 30w


1970 tr6r dryframe
Re: fork oil. #128917
11/18/07 1:15 pm
11/18/07 1:15 pm
Joined: Oct 2003
Posts: 11,148
North Georgia, USA
RF Whatley Offline
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North Georgia, USA


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
Re: fork oil. #128918
11/18/07 1:25 pm
11/18/07 1:25 pm
Joined: Aug 2001
Posts: 918
hampshire, england
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t120mike Offline
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Joined: Aug 2001
Posts: 918
hampshire, england
Are you sure you dont mean "fork 'andles", Ronnie?


mike
Member #: 147
1960 T120 Bonneville
1999 H*%^a VFR 800 FI
V4 Triton Project (still keeping me sane (Ha-Ha!))
Re: fork oil. #128919
11/18/07 2:08 pm
11/18/07 2:08 pm
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
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Fork oils? I've only got two!

Blapper redwine

Re: fork oil. #128920
11/18/07 4:00 pm
11/18/07 4:00 pm
Joined: Aug 2006
Posts: 258
half moon bay, ca
D
dan charles tr6r Offline OP
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dan charles tr6r  Offline OP
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Joined: Aug 2006
Posts: 258
half moon bay, ca
thank you. dan

Re: fork oil. #128921
11/18/07 11:01 pm
11/18/07 11:01 pm
Joined: Oct 2003
Posts: 3,526
Emsworth, sunny south of Engla...
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dave jones Online content
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Emsworth, sunny south of Engla...
Silkolene and Rock oil make fork oil thick enough for a 650 Triumph.

Dave

Re: fork oil. #128922
11/19/07 2:56 am
11/19/07 2:56 am
Joined: Jun 2002
Posts: 9,536
Scotland
S
Stuart Online content
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Posts: 9,536
Scotland
Hi Dan,

I agree with proper fork oil and not engine oil - the latter foams when pushed through damping orifices, and then air does not a good damping medium make.

But 30W! eek ... ummm, how can I put this politely? wink

Alright, I'm an obviously-sylph-like 170-odd lbs. After much experimentation, my twin-front-disc T160's (100-odd lbs. heavier than a TR6) run 25W Bel-Ray fork oil and this works even two-up with luggage in up to 100-degrees ambient. My T100R runs 20W.

Hth.

Regards,

Re: fork oil. #128923
11/19/07 10:58 pm
11/19/07 10:58 pm
Joined: Jul 2007
Posts: 594
australia
6
649 Offline
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649  Offline
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Joined: Jul 2007
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australia
triumph owners manual til 1970 (preOIF) recommends 30w engine oil...but what would they know


1970 tr6r dryframe
Re: fork oil. #128924
11/20/07 10:42 am
11/20/07 10:42 am
Joined: Aug 2007
Posts: 45
South Yorkshire UK
P
PLUG Offline
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Posts: 45
South Yorkshire UK
I was told recently to put in Auto trans Fluid ATF as it works well and doesn't cause any frothing Has anyone used it..
Dave..


You came into the world with nothing and you go out with nothing.
SO what what ya lost = "NOTHING"
Re: fork oil. #128925
11/20/07 11:48 am
11/20/07 11:48 am
Joined: Jun 2002
Posts: 9,536
Scotland
S
Stuart Online content
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Quote:
Originally posted by 649:
triumph owners manual til 1970 (preOIF) recommends 30w engine oil...but what would they know
As I have pointed out in another thread, depending on which Triumph last updated "til 1970" manuals:-

1. Triumph as part of the BSA Group went out of business in about 1972;

2. Triumph as part of NVT went out of business in about 1976;

3. Triumph as the Meriden Co-op went out of business in about 1982;

4. Triumph built by L.F. Harris under licence went out of business in about 1988;

5. JR Technical Publications are currently licensed by the current (Hinkley) Triumph company - which owns the copyright to *all* publications bearing the Triumph logo; aiui, the licence specifically prohibits changes to the original text.

You will note that the aforementioned dates are all some years ago; you may be surprised to learn that people who actually ride old bikes have either continued development in a number of areas or have taken developments done by others and adapted them to old Triumphs. Fork damping fluid is one such area.

Quote:
Originally posted by PLUG:
Auto trans Fluid ATF
ATF is something recommended by one of the Triumph incarnations after 1970. However, afaik, it is of one viscosity, which means that it is ultimately suitable only for a narrow range of conditions.

For example, Triumph (as part of NVT) recommended ATF for the forks on a T160. However, if an owner (say, me) subsequently fits a second disc brake to the front wheel, loads the bike up with another adult and sufficient stuff to make being away from home for a week or two reasonably civilised, ATF is pretty hopeless as a fork damping fluid and the riding experience becomes less of a pleasure. As there is (and has been for a couple of decades) something both specific and better, why would one not use it?

Hth.

Regards,

Re: fork oil. #128926
11/20/07 12:31 pm
11/20/07 12:31 pm
Joined: Nov 2006
Posts: 176
Dillsburg, PA - USA
mattstriumph Offline
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Dillsburg, PA - USA
Fork oil, seems obvious to me.



1965 Triumph T100SR
Re: fork oil. #128927
11/20/07 1:55 pm
11/20/07 1:55 pm
Joined: Oct 2003
Posts: 3,526
Emsworth, sunny south of Engla...
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dave jones Online content
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Emsworth, sunny south of Engla...
No need to make a big issue out of it. I use 20 or 30 weight fork oil in my external spring forks. Rock oil and Silkolene make something suitable. 30 may sound heavy but it is for a certain design of fork. If you put 30 in another fork it may well be stiff as ****.

As 649 says 30w engine oil will be ok because the forks are the same as they were when made and if it worked ok then it will work alright now and I bet modern oil doesn't froth so much anyway. No need to tear him to bits Stuart.

dave

Re: fork oil. #128928
11/20/07 9:44 pm
11/20/07 9:44 pm
Joined: Jun 2007
Posts: 5,598
Maui Hawaii
HawaiianTiger Online content

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Maui Hawaii
You guys are missing the obvious. Fork oil is for forks that go up and down. Mine don't at least not very much. I ride on smooth roads. So, I use engine oil but not just any engine oil. I would have to drive all the way over to the other side of the island to get fork oil and I'm just not that annal. I can get the "purple" synthetic oil in or Syntech in any viscosity I want locally. I use them in the forks of my Triumph and my Norton. I just took apart the forks of my Norton after 6 years of use and the seals and bushings look brand new. Plus the forks are very smooth with almost no "stiction" I think I used 10-40 Syntech if I remember correctly. Cheaper than fork oil, too.
Aloha,
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
Re: fork oil. #128929
11/20/07 10:35 pm
11/20/07 10:35 pm
Joined: Jul 2007
Posts: 594
australia
6
649 Offline
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649  Offline
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Joined: Jul 2007
Posts: 594
australia
well Ive been actually riding for 40 years,and still happy to use engine oil for everyday riding...Ive got the original manuals and handbooks and am happy to use the info in them as I dont believe it suddenly went wrong in 1972, and technological advances on a 1930s design probably arent going to make a great deal of difference...Im happy to be stand corrected if Im actually wrong (and giving out incorrect or misleading advice) but not really interested in being taken to task for giving out the original recommendation that is still quite valid and useable, tho others may have decided there are more modern alternatives...if you want to use 30w fork oil or experiment do so by all means, its a whole 190cc per side of oil and 4 screws to change but for everyday riding 30w engine oil is fine..this is my OPINION, as are all the other answers here..but ATF is definitely not right for the pre 1970 nonOIF forks
phrases such as "how do I put this politely" arent really necessary and usually meant as a putdown ...its just a sharing of info/ideas here and anyone who asks a question should weigh up the answers and decide if its valid info....simple stuff, but grown mature adults can still make a big issue out of what grade of oil to put in 40 year old motorcycle forks...hopefully none of us work in the military decision making dept isnt it...sir I disagree with what fork oil they're using we must invade now..


1970 tr6r dryframe
Re: fork oil. #128930
11/21/07 1:44 am
11/21/07 1:44 am
Joined: Mar 2006
Posts: 1,199
Magnolia, TX
htown Online content
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Magnolia, TX
What weight in a 1978? Generally a single rider, 200+, no luggage.


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
2-1974 Norton Commandos
2004 XL 1200R Sportster

Everything will be alright in the end. If its not alright, its not the end.
Re: fork oil. #128931
11/21/07 2:37 am
11/21/07 2:37 am
Joined: Oct 2003
Posts: 11,148
North Georgia, USA
RF Whatley Offline
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North Georgia, USA
Quote:
Originally posted by htown:
What weight in a 1978? Generally a single rider, 200+, no luggage.
All Triumph & BSA aluminum fork leg bikes (1971 - until) came specified for ATF, which is approx 8W. What is best for YOU depends on your weight, your riding style, and your road conditions. So only YOU can find out.

Luckily, we're not talking more than $20 to answer the question.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
Re: fork oil. #128932
11/21/07 4:02 am
11/21/07 4:02 am
Joined: Nov 2004
Posts: 1,694
georgia
T
trumpetloon Offline
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georgia
People... please no spitballs here! There are as many "correct" answers here as there are different bikes; and people who weigh 150 pounds to 400 pounds; who ride the superslab; or have a driveway which consists of 3 miles of gravel and dirt.

Some of us ride bikes with different suspension systems... some "period", or considerably more modern. Thus each bike/rider combination must be considered as an individual... and each owner/tuner should listen without predjudice to the opinion of fellow owners/tuners, and make an informed choice from the shared wisdom.

If that choice is less than adequate... so what? As RF says... oil's cheap... experiment until you are happy and please don't "dis" anyone who got good result from another choice.


1974 TR5T
Re: fork oil. #128933
11/21/07 4:17 am
11/21/07 4:17 am
Joined: Nov 2004
Posts: 1,694
georgia
T
trumpetloon Offline
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georgia
Also remember that volume of oil is a valid tuning device as well... if 190cc of say... 30WT engine oil is a bit stiff... 175cc may be just the ticket. Or 200cc if too soft.

I am reminded of a friend who shopped for new stereo speakers online using published "consumer reports" as a guide toward evaluation. He bought a very expensive pair of speakers without listening to them first... even though a pair were available at a local dealer for him to sample. He HATED the sound... and I have them now for 1/2 price because I think they were designed with my particular hearing range (loss) in mind.

Every owner must try different combinations of bits on your bike to determine the best fit for you. That is part of the journey, and finding the "magic combo" is part of the reward!


1974 TR5T
Re: fork oil. #128934
11/21/07 6:35 am
11/21/07 6:35 am
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Tiger Offline
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Tiger  Offline
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Melbourne Australia
I use 20W synthetic fork oil with new L P Williams progressive springs, works well as the springs have a lot more to do with rider/load weight than does the fork oil.
Anyone running original springs after all these years would be well advised to toss them in the scrap bin and start off afresh with a known quantity rather than confusing dampening with springing.
Trumpetloon is exactly correct, this is a job for the informed individual.
With OIF forks you can slip three "O" rings over each fork stanchion, one set at max travel [bottomed] and the other two to gauge differences in travel during tuning/setup.
Overdamped and undersprung forks are a recipe for losing the front and that is the quickest way to the ground and pain, trust me on this. bigt


1969 TR6R
7.62 x 51 is not a maths puzzle.
Re: fork oil. #128935
11/21/07 7:37 am
11/21/07 7:37 am
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
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Kent UK
Hi Tiger,

How much do you weigh? I ask because I am going exactly your route for my rebuild also.

I am 150lb (70kg) so I am thinking 10-15W. I am not a racer anymore, more like a tourer.

Cheers,

Blapper redwine

Re: fork oil. #128936
11/21/07 8:17 am
11/21/07 8:17 am
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Tiger Offline
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Tiger  Offline
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Melbourne Australia
A little under 200lb stark nekkid, happy to send pictures if you like ? laugh
If I were you I would use #20 oil and work from there, not keen on engine oil for reasons described by Stuart, cavitation is a real issue and proper dampener oils would have a very low vapour pressure to combat this.


1969 TR6R
7.62 x 51 is not a maths puzzle.
Re: fork oil. #128937
11/21/07 8:18 am
11/21/07 8:18 am
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Tiger Offline
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Tiger  Offline
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Quote:
Originally posted by Tiger:
A little under 200lb stark nekkid, happy to send pictures if you like ? laugh
If I were you I would use #20 oil and work from there, not keen on engine oil for reasons described by Stuart, cavitation is a real issue and proper damper oils would have a very low vapour pressure to combat this.


1969 TR6R
7.62 x 51 is not a maths puzzle.
Re: fork oil. #128938
11/21/07 8:35 am
11/21/07 8:35 am
Joined: Jul 2002
Posts: 604
England
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England
I'd guess handlebar choice is also a factor. I tried 20W on my T140 and found it too harsh with Progressive springs (I weigh about 190LBs). Have gone to Silkolene 10. I have Western (?) bars - about 6" rise and wide, on my bike. Flatter bars would probably put more weight on the front wheel and require heavier oil.

Re: fork oil. #128939
11/21/07 9:15 am
11/21/07 9:15 am
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
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Kent UK
Hmm, yes, mine has US bars so little weight on the front except when braking when the weight would be exaggerated by the height of the bars. Maybe I'll start even lighter maybe even ATF? My understanding of it is that you would use a lighter oil in progressive springs to get the 'finesse' whaddya reckon?

Blapper redwine

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