LCGB Forums

The ability to post messages is restricted to LCGB members. Any questions contact us at lcgbadmin@googlemail.com

Best clips to hold carbs onto rubbers/manifolds?

Want to know which carb to choose? Having problems setting up the jetting details on your scooter? Wheter you are using a standard or tuned carb, ask your question here.

Best clips to hold carbs onto rubbers/manifolds?

Postby Pompeydave » Mon Jun 25, 2018 12:29 pm

Hi all, having trouble with a suspected air leak on a rubber mounted PWK 28mm on a Casa 186 kit that’s been bored out to 200cc. I have the correct grooved inlet manifold and a matching ridged inlet rubber. My problem is that every ‘Jubilee’ type clip I use is distorted where the screw is i.e. the bit the screw mounts on is thicker and thus grips the hose in a distorted non round manner. This means that the rubber is gripped and tightened in an uneven way and I suspect is causing an air leak. Are there any specialist clips out there that grip evenly as they’re tightened? I wonder if the twin wire loop style might be better as they’d grip the rubber either side of the ridge and groove inside?
User avatar
Pompeydave
 
Posts: 137
Joined: Fri May 30, 2014 1:24 pm

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby steve t » Mon Jun 25, 2018 3:52 pm

What about trying the spring clips that are used on modern coolant hoses on cars the ones with the ears that u use pliers on sorry don’t know what there proper name is
steve t
 
Posts: 230
Joined: Wed Sep 02, 2015 7:22 pm

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby Pompeydave » Mon Jun 25, 2018 4:31 pm

Yep, know the type you mean. Don’t think they’d be any good as you can’t adjust them- the tightness is fixed.
User avatar
Pompeydave
 
Posts: 137
Joined: Fri May 30, 2014 1:24 pm

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby Tractorman » Mon Jun 25, 2018 9:34 pm

Those clips are spring loaded and are self tightening. Access to use the pliers may be an issue and it means carrying an extra tool. You need to get some of the narrower jubilee clips, they fit better than the wide ones.
User avatar
Tractorman
 
Posts: 7775
Joined: Mon Jun 02, 2014 3:07 pm
Location: Lincoln

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby Toddy » Tue Jun 26, 2018 6:09 am

User avatar
Toddy
 
Posts: 9656
Joined: Tue May 13, 2014 9:58 pm
Location: East Yorkshire

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby Pompeydave » Tue Jun 26, 2018 12:29 pm

Ok, I don’t think they’re ideal though as they don’t tighten up up in a uniform way due to the extra metal under the screw. This then leads to the potential air leaks. I like these better, but I cant find any that are narrow enough for the rubber. https://m.ebay.co.uk/itm/ASH-Hose-Clamps-Heavy-Duty-Exhaust-Hex-Screw-New-T-Bolt-Stainless-Steel-Clips-W4/222607620197?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20180213162448%26meid%3D79331caa45a2423fbe089debafdcc9ea%26pid%3D100930%26rk%3D3%26rkt%3D8%26mehot%3Dpp%26sd%3D121179363544%26itm%3D222607620197&_trksid=p2056116.c100930.m5375
User avatar
Pompeydave
 
Posts: 137
Joined: Fri May 30, 2014 1:24 pm

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby Toddy » Tue Jun 26, 2018 12:40 pm

Pompeydave wrote:Ok, I don’t think they’re ideal though as they don’t tighten up up in a uniform way due to the extra metal under the screw. This then leads to the potential air leaks. I like these better, but I cant find any that are narrow enough for the rubber. https://m.ebay.co.uk/itm/ASH-Hose-Clamps-Heavy-Duty-Exhaust-Hex-Screw-New-T-Bolt-Stainless-Steel-Clips-W4/222607620197?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20180213162448%26meid%3D79331caa45a2423fbe089debafdcc9ea%26pid%3D100930%26rk%3D3%26rkt%3D8%26mehot%3Dpp%26sd%3D121179363544%26itm%3D222607620197&_trksid=p2056116.c100930.m5375



Will they fit ?

Whist offering an option used these for a while and done a few miles with no carb issues ( famous
Last words ) :?
User avatar
Toddy
 
Posts: 9656
Joined: Tue May 13, 2014 9:58 pm
Location: East Yorkshire

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby Adam_Winstone » Tue Jun 26, 2018 2:03 pm

MB do some good ones, with a slightly rolled lip to avoid them cutting into the rubber.

However, the BIGGEST issue with carb / rubber / manifold issues is the match of rubber and locating rib on carb stub and manifold. When you get the right match you'll have a job even pulling the rubber back off without a clip fitted! So many times the diameter is slightly wrong and/or the rib (or ribs) are in the wrong position. If the rib is even slightly off from where it should be then you'll find that the carb wants to pop off easily, with tightening the clip just making it worse; forcing it off or causing it to split.

Get the rib position right and you'll never suffer this again. Don't take the word of anyone supplying you with a rubber, look at it and compare the rib position. Frustratingly, there are many different carbs, manifolds, diameters and rib positions and you must get the right combination. Many dealers will sell you a rubber of the correct diameter BUT with the rib in completely the wrong position. Even the same manufacturer may cause you issue, e.g. PHBH and VHSA carbs are very similar diameters but the rib location is at a VERY DIFFERENT position and yet many dealers supply the same rubber for both. PM me your email address and I'll send you a photo that I posted on a similar thread a number of years ago.

The other way to address this issue is to rework your carb stub and/or manifold so that the rib position is correct.... but try to find the right rubber before going down this route.

Good luck.

Adam
Adam_Winstone
 
Posts: 1069
Joined: Tue Jun 03, 2014 1:52 pm

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby Knowledge » Tue Jun 26, 2018 5:05 pm

Wise words Adam.

I did an Oily Rag on this subject many years ago, and it explained how I had to modify the carb stub to get the groove in correct place.

What a faff, but no more clip issues.

I have also switched to using flange rubbers, as these need only one clip. It might need modification of the manifold if it is not already suitable for a flange rubber, but it is worth it.

Flange rubbers are available from Allen's Performance.
User avatar
Knowledge
 
Posts: 1953
Joined: Sat May 31, 2014 11:42 am
Location: Ipswich

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby rossclark » Tue Jun 26, 2018 11:34 pm

It would be nice to have a thread or section with the all the historical oily rag articles...

Just saying... Again
User avatar
rossclark
 
Posts: 2855
Joined: Fri May 30, 2014 11:23 pm
Location: Lanarkshire

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby Feersum Injun » Wed Jun 27, 2018 12:10 pm

Knowledge wrote:Flange rubbers are available from Allen's Performance.


Oooh... what a great tip/link... I've recently fitted a LTH manifold and the flange rubber that came with it doesn't look up to much. I've been looking at the MB one but the Allens site looks really useful! Ta...
User avatar
Feersum Injun
 
Posts: 215
Joined: Tue Apr 26, 2016 11:21 pm
Location: Wirral

Re: Best clips to hold carbs onto rubbers/manifolds?

Postby shane BBoys » Thu Jul 19, 2018 5:25 pm

Feersum Injun wrote:
Knowledge wrote:Flange rubbers are available from Allen's Performance.


Oooh... what a great tip/link... I've recently fitted a LTH manifold and the flange rubber that came with it doesn't look up to much. I've been looking at the MB one but the Allens site looks really useful! Ta...


Please let me know if you do get 1 from Allen’s and how you get on. I also have bought an LTH for my muggi project.

Shane
User avatar
shane BBoys
 
Posts: 479
Joined: Sat Sep 06, 2014 5:46 pm
Location: Bradford


Return to Carburettors

Who is online

Users browsing this forum: No registered users and 5 guests