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LF Harris Master cylinder
#812906 06/17/20 12:33 pm
Joined: Jan 2014
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BigBars Offline OP
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Hi Folks, my new to me t150 came with a new LF harris style master cylinder as advertised on the various vendors sites .

However, It fits badly to the handlebar , the radius is too small so the bracket only touches the handlebar at the two sides of the bracket. (As per my new cable style clutch lever for the TR6, also apparently supplied by LF Harris....., as per my t110 switch from Ace classics :facepalm). also a good 5mm gap between the silver and the black brackets on one side if I try to tighten the screws

Anyone massaged this to fit, leave as it? The silver Lucas switch side has the perfect radius.

pictures of my previous adventures.

This for the TR6 clutch lever.

[Linked Image from i.imgur.com]

This was for the T110 Switch

[Linked Image from i.imgur.com]

Last edited by BrettF; 06/18/20 7:06 am.

3D TV: A format that lost a format war without even having an opponent.
Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine) + 74 T150 Home model.
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Re: LF Harris Master cylinder
BigBars #812917 06/17/20 2:43 pm
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Are your bars over size?


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Greeves 200 "Blue Meanie"
Greeves 350
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Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500 sprint/LSR bike "Deofol"
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Re: LF Harris Master cylinder
BigBars #812935 06/17/20 5:49 pm
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no, standard, the throttle and all Lucas switch clamps all fit perfectly.

Any one else used the new master cylinder with handlebar mount?


3D TV: A format that lost a format war without even having an opponent.
Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine) + 74 T150 Home model.
Re: LF Harris Master cylinder
BigBars #813014 06/18/20 7:05 am
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This is the problem on the t150. Seems they all use the same mould facepalm . this bracket is much on the visible side the other side is not quite as bad. Knowing the seller, he found a cheap version somewhere that claimed to be "LF harris".

[Linked Image from i.imgur.com]

I'm going to change my name to "BigBars" laughing

Last edited by BrettF; 06/18/20 7:08 am.

3D TV: A format that lost a format war without even having an opponent.
Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine) + 74 T150 Home model.
Re: LF Harris Master cylinder
BigBars #813049 06/18/20 3:35 pm
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Hi Bigbars---- where the clamp is---uis the bar straight or partly on a bend?
Just trying to think aloud.

Re: LF Harris Master cylinder
BigBars #813106 06/19/20 1:34 am
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Both my Triumphs use the Harris master cylinder and it fits fine. Both bikes use the same Euro bend bars by Emgo.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"
Re: LF Harris Master cylinder
BigBars #813205 06/19/20 8:46 pm
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Got a new triumph master cylinder on my Thunderbolt, made for 7/8 bars (T140 fitment) I also have a NOS Triumph/Lockheed item and the two are virtually identical same markings etc. The only difference is the LF Harris mirror piece accepts M8 mirror threads.

It definitely looks nothing like yours, it could be a Micky mouse body and someone has fit the actual master cylinder in to it as these are available separately.


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Re: LF Harris Master cylinder
BigBars #813222 06/19/20 11:13 pm
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Just measured the bars, 22.2 mm +- .1mm on both the tr6 and the t150.

is that standard?


3D TV: A format that lost a format war without even having an opponent.
Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine) + 74 T150 Home model.
Re: LF Harris Master cylinder
BigBars #813226 06/19/20 11:48 pm
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7/8" = 22.23 mm.
Sounds as though both yours are standard 7/8" bars.
In which case ---assuming that you are trying to clamp on a straight portion of the bar then you have a case to take up with the supplier.
Personally I have never come across this problem (but plenty of different ones!).

Re: LF Harris Master cylinder
BigBars #813247 06/20/20 5:55 am
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Hi tridentman, thanks for the suggestion, yes it was on a straight part of the bars. They were installed by the DPO at least two years ago, so he's been riding like that... I think I'll drain the brake fluid, and remove it for a good look.

The t110 image above needed surprising little meat removed to make it fit, while the TR6 needed surprisingly much.

Cheers BMF


3D TV: A format that lost a format war without even having an opponent.
Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine) + 74 T150 Home model.
Re: LF Harris Master cylinder
Allan G #813256 06/20/20 8:01 am
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Originally Posted by Allan G
Got a new triumph master cylinder on my Thunderbolt, made for 7/8 bars (T140 fitment) I also have a NOS Triumph/Lockheed item and the two are virtually identical same markings etc. The only difference is the LF Harris mirror piece accepts M8 mirror threads.

It definitely looks nothing like yours,...

What's different?


Originally Posted by BigBars
The t110 image above needed surprising little meat removed to make it fit,

A T110 would normally have a 1.0" handlebar.

https://www.eBay.co.uk/itm/Triumph-...9-Lenker-pre-unit-original-/173100781399

"Triumph Handlebar reduced bar 1inch-15/16 97-1009 H1009 Lenker pre unit original

As fitted to Triumph pre-unit models (1949-62).
Handlebar Diameter: 1" reducing only right side to 15/16" for the twistgrib"

Re: LF Harris Master cylinder
BigBars #813606 06/22/20 9:14 pm
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Soooo, here is a pic of the unit, it looks like the correct one, right?

[Linked Image from i.imgur.com]

But looking around I found aluminum shavings in the unit and wondered , "what the f&^*k had the loser who "refreshed" the bike been up to now".

This is what I found:

The idiot had enlarged the hole very badly and I found a VERY Heath Robinson plastic pushrod for the brake light.

[Linked Image from i.imgur.com]

In the handle I found a torx screw through the plastic mounding with the end ground flat to push the plastic rod (which it misses by a mile)

[Linked Image from i.imgur.com]

Can anyone take a picture or tell me what should be going on in here.

Every single thing this guy touched .......


3D TV: A format that lost a format war without even having an opponent.
Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine) + 74 T150 Home model.
Re: LF Harris Master cylinder
BigBars #813609 06/22/20 10:03 pm
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Originally Posted by BigBars
Soooo, here is a pic of the unit, it looks like the correct one, right?

Looks ok to me.


Originally Posted by BigBars
But looking around I found aluminum shavings in the unit and wondered , "what the f&^*k had the loser who "refreshed" the bike been up to now".
This is what I found:
The idiot had enlarged the hole very badly and I found a VERY Heath Robinson plastic pushrod for the brake light.

I can't tell if the plastic pin is the original item or not but it's obviously not positioned correctly.


Originally Posted by BigBars
In the handle I found a torx screw through the plastic mounding with the end ground flat to push the plastic rod (which it misses by a mile)

Normally a posidriv screw with a flat tip.

Originally Posted by BigBars
Can anyone take a picture or tell me what should be going on in here.


[Linked Image from i.postimg.cc]
[Linked Image from i.postimg.cc]

Re: LF Harris Master cylinder
BigBars #813623 06/23/20 1:16 am
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The original standard front brake light switch was indeed designed by Mr. Heath Robinson.
It is very common even if you get it working for it not to work for long.
It looks and sounds as though your DPO has tried to "improve" the design.
IME people either don't bother to get it working relying on the rear brake switch to trigger the brake light or they put a hydraulic switch into the front brake hydraulics. This latter course of action is IMHO the most sensible and reliable way forwards.
Not original but capable of working reliably.
HTH

Re: LF Harris Master cylinder
BigBars #813642 06/23/20 5:30 am
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Thanks so much folks.


3D TV: A format that lost a format war without even having an opponent.
Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine) + 74 T150 Home model.

Moderated by  Tridentman 

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