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Can't install carb boots

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07 Mar 2021 15:12 - 07 Mar 2021 15:17 #844535 by luisazmz
Can't install carb boots was created by luisazmz
I recently found new (old) BS-38s for my KZ750B after fighting with the VM34s for over a year and not getting the bike to run properly. Plug after plug got carbonized, bike was running too rich, tried everything single pilot out there with every float height and setup and nothing did it. My next step was, let's try the original carburetors this bike was designed for. I finally got them and got the new (old) boots as well, but they’re an incredible tight fit. I can only get the carbs half way in, can’t go over the rubber 'ring' that's in the middle that I’m guessing is was fully holds them in place. Is it suppose to be this difficult to get them in ? Also do I use a gasket between the boots and the engine or just screw them in without any gasket?

THANK YOU
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Last edit: 07 Mar 2021 15:17 by luisazmz.

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07 Mar 2021 15:32 - 07 Mar 2021 15:40 #844536 by TexasKZ
Replied by TexasKZ on topic Can't install carb boots
The lower one in the picture looks used. If the rubber is hard, there is a good chance they will leak. A picture or two from the side might make it more clear to forum members if the boots are fully seated.
No gasket should be used. If the rubber is hard, they will not seal. Some Three-Bond or Hylomar may help for a while, but they will only work if the rubber is supple.

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Last edit: 07 Mar 2021 15:40 by TexasKZ.

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07 Mar 2021 19:57 #844546 by blipco
Replied by blipco on topic Can't install carb boots
I've found that a little swirl of Vasoline in the carb holders helps things along.
And if you can get a wooden 2x3 or I think I used a 1 1/2 x 1 1/2 square piece of wood to gently pry on each carb in turn they'll suddenly plop into place.
I'm about to do the same in a couple of days once the weather warms up. I'm not looking forward to it but at least I have new supple carb holders.

"Swim against the current, even a dead fish can go with the flow"-somebody (I forget Who)

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08 Mar 2021 01:34 #844554 by zed1015
Replied by zed1015 on topic Can't install carb boots
Just wipe a bit of oil or grease around the inside and they should pop on.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
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08 Mar 2021 07:09 - 08 Mar 2021 07:19 #844567 by martin_csr
Replied by martin_csr on topic Can't install carb boots
Make sure the clamps are floppy loose.
Last edit: 08 Mar 2021 07:19 by martin_csr.

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09 Mar 2021 16:10 #844643 by Kidkawie
Replied by Kidkawie on topic Can't install carb boots
Theres a bunch of videos on youtube about softening and restoring rubber parts.

1975 Z1 900
1994 KX250 Supermoto
2004 KX125

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11 Mar 2021 13:50 #844777 by davido
Replied by davido on topic Can't install carb boots
' Wintergreen' is the stuff to use,apparently. Mix with water and boil them. Makes a terrible smell. I wanted to avoid this,so I just wiped them down,sealed them in a bag and put it somewhere safe! That was about 5 years ago. Still haven't found them. I ended up buying new ones for my build.I think they were only about euro10 each on ebay. One day,the originals will turn up. And they better be super soft!!

www.kzrider.com/forum/11-projects/594313-csr1000-project-build
CB550 (1978)
CB500/4 (1972)*
KZ1000CSR (1981)
XT 600E (1999)
TDM900 (2003)

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11 Mar 2021 15:27 #844784 by Mikaw
Replied by Mikaw on topic Can't install carb boots
I haven’t found what works yet but I know by accident what definitely doesn’t. I wanted to clean up some rubber parts. Just knock the funk off. So I dropped them in kerosene with the intention of it only being long enough till I found my degreaser brushes... Well oldtimers kicked in and I lost track and two days later I remembered. I pulled them out and initially thought I has found a hidden secret. They were super soft but then I noticed they were swelled up about 1 1/2 times normal size. I thought cool they just need to dry up. Well about a week later they we hard as a rock and smaller then normal. I guess the kerosene drew out all the oils from them... they quickly when in the garbage.

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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13 Mar 2021 18:10 #844884 by blipco
Replied by blipco on topic Can't install carb boots
Kerosene is recommended to clean o ring chains. But then again you don't leave them soaking.

"Swim against the current, even a dead fish can go with the flow"-somebody (I forget Who)

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14 Mar 2021 09:43 - 14 Mar 2021 09:44 #844902 by luisazmz
Replied by luisazmz on topic Can't install carb boots
I managed to snap them in place using a little bit of red n tacky but that was with the boots not installed of course, would’ve been impossible if they were mounted on the engine. Getting them screwed to the engine was another challenge. The rubber is definitely rock hard, no way they were made that tight of a fit. Looking for a better solution for boots though if i find one I’ll post.
Last edit: 14 Mar 2021 09:44 by luisazmz.

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14 Mar 2021 18:36 #844927 by ghostdive
Replied by ghostdive on topic Can't install carb boots
I have good luck with a blow dryer (or, even better, a heat gun) for all of my hard rubber parts. Might be worth a shot!

1982 KZ750 Spectre - 6 speed swap, BS34s, 18" rear wheel

2001 ZX-6R
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14 Mar 2021 19:44 - 14 Mar 2021 19:44 #844930 by 650ed
Replied by 650ed on topic Can't install carb boots
Rather than fight the problem and not find a good solution, why not just replace them with new ones? I know new ones are a little expensive on eBay, but it's not like you will need to replace them frequently. Once every 25 years should be about it. Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Last edit: 14 Mar 2021 19:44 by 650ed.
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