Author Topic: Carburettor Insulators  (Read 2785 times)

Offline Nurse Julie

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Re: Carburettor Insulators
« Reply #30 on: October 25, 2018, 04:28:42 PM »
See attached  ;)
That's what I have been looking at Paul in my manual, what route does yours take?

The one above in the manual  :)
Ok, I will re route mine then, I don't like being too different to everyone else 😂😂😂 But, it also F's my theory of why they have flat spots on No's 2 and 3. I don't think it can be just for ease of handling, it just doesn't make sense to me.
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Offline taysidedragon

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Re: Carburettor Insulators
« Reply #31 on: October 25, 2018, 04:36:01 PM »
Julie, that's a good theory, but the engine breather hose goes over the top of the carbs, in the frame clip under the frame tube alongside the wiring harness, down behind the plastic air box and joins the contraption under the air filter.
The routing is shown on p87 of the dealer manual. I guess this keeps the rubber hose away from the engine heat as much as possible.
Do you know something, that's bloody amazing and yes, I can see it on page 87. My old 400/4 and this one has it routed between the carbs, I will have to re route it but the angle at the bottom before it goes into the air box bit, would be so acute, I would worry it would clamp itself off.
Edit...does anyone know if the original factory fitted breather pipe had bends shaped in to it?

Julie, I thought that it would be a tight bend at the bottom as well but it's not too bad. I made the mistake of fitting the breather hose after assembling nearly everything else. Getting hands in there to fit it to the plastic gizmo is a nightmare!
I thought I would have to remove a few items to make space, but I did manage it eventually, with a few skinned knuckles. The chainguard was off which helped. 🔧👍
Gareth

1977 CB400F
1965 T100SS

Offline Nurse Julie

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Re: Carburettor Insulators
« Reply #32 on: October 25, 2018, 04:44:09 PM »
Julie, that's a good theory, but the engine breather hose goes over the top of the carbs, in the frame clip under the frame tube alongside the wiring harness, down behind the plastic air box and joins the contraption under the air filter.
The routing is shown on p87 of the dealer manual. I guess this keeps the rubber hose away from the engine heat as much as possible.
Do you know something, that's bloody amazing and yes, I can see it on page 87. My old 400/4 and this one has it routed between the carbs, I will have to re route it but the angle at the bottom before it goes into the air box bit, would be so acute, I would worry it would clamp itself off.
Edit...does anyone know if the original factory fitted breather pipe had bends shaped in to it?

Julie, I thought that it would be a tight bend at the bottom as well but it's not too bad. I made the mistake of fitting the breather hose after assembling nearly everything else. Getting hands in there to fit it to the plastic gizmo is a nightmare!
I thought I would have to remove a few items to make space, but I did manage it eventually, with a few skinned knuckles. The chainguard was off which helped. 🔧👍
Luckily, I have very small hands, just right for getting in awkward places  ;D ;D My 400/4 is off the road now for the winter so i will add that to the fettle list.
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Offline taysidedragon

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Re: Carburettor Insulators
« Reply #33 on: October 25, 2018, 04:55:04 PM »
They are 2 types. One is marked 1 and 4, the other marked 2 and 3. It depends which side you're looking at.
Gareth

1977 CB400F
1965 T100SS

Offline taysidedragon

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Re: Carburettor Insulators
« Reply #34 on: October 25, 2018, 04:59:18 PM »
So are you saying that they have both numbers on and you just turn them round to show the correct number? eg 1 and 4 are on both sides of the outer insulator

Yep. Took me ages to notice it!
Gareth

1977 CB400F
1965 T100SS

Offline Nurse Julie

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Re: Carburettor Insulators
« Reply #35 on: October 25, 2018, 05:09:26 PM »
Couple of things.

Julie your insulator picture on post 11 clearly shows that the insulator from number 2 cylinder is fitted to number 1 cylinder, sorry I just notice stuff like that.


You are correct Ken, I have also just noticed that No 4 is fitted to No.3 cylinder  :-[ :-[ :-[ 
Im still not understanding how only 2 part numbers covers 4 parts, or am i being thicker than normal ?

Oh, hang on, am i right in thinking then that there are numbers on the underside too then?
OK, got it, No. 3 one side, No 2 the other...No.4 one side, No.1 the other
Soooooo, mine are all on in the wrong places I guess  :'( :'( :'( :'( :'( :'(
« Last Edit: October 25, 2018, 05:21:57 PM by Nurse Julie »
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Offline Nurse Julie

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Re: Carburettor Insulators
« Reply #36 on: October 25, 2018, 05:40:42 PM »
I bet that when I tell Trig later about those number, he will say 'I knew that'.....no wonder he despairs with me at times  :) :) :). Its been a bad afternoon, not only are my insulators on the wrong cylinders but i routed the breather pipe the wrong way as well.......every day is a school day with these old bikes.

But, more to the point, we still haven't sussed what the indents are for.
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Offline taysidedragon

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Re: Carburettor Insulators
« Reply #37 on: October 25, 2018, 05:41:32 PM »
Oh no! I'm surprised that you could get the air box on. 😟
Gareth

1977 CB400F
1965 T100SS

Offline Nurse Julie

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Re: Carburettor Insulators
« Reply #38 on: October 25, 2018, 05:46:19 PM »
Oh no! I'm surprised that you could get the air box on. 😟
Everything fits perfectly, or i made everything fit perfectly with no problems at all  ;D ;D.
I have done over 1500 miles on her since rebuilding the engine earlier this year and she's running just fine, other than a bit of dirt in an idle jet (also on the fettle list) i wasn't planning to do much else to her this winter, now i'm going to be swapping parts around to their rightful places  :'( :'( :'(
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
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Offline taysidedragon

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Re: Carburettor Insulators
« Reply #39 on: October 25, 2018, 05:49:48 PM »
Oh no! I'm surprised that you could get the air box on. 😟
Everything fits perfectly, or i made everything fit perfectly with no problems at all  ;D ;D.
I have done over 1500 miles on her since rebuilding the engine earlier this year and she's running just fine, other than a bit of dirt in an idle jet (also on the fettle list) i wasn't planning to do much else to her this winter, now i'm going to be swapping parts around to their rightful places  :'( :'( :'(

Ah well. Something to keep you busy through the winter months. ☺
Gareth

1977 CB400F
1965 T100SS

Davelu88

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Re: Carburettor Insulators
« Reply #40 on: October 25, 2018, 08:38:52 PM »
I couldnt see any difference in mine that are off plus if Julie has hers on wrong they still must go on ok and line up , just a thought  ;D

Offline Deano400

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Re: Carburettor Insulators
« Reply #41 on: October 25, 2018, 08:46:11 PM »
If I get chance tomorrow I will try Oddjob's suggestion of swapping the insulators round and fitting the carbs. It may well highlight an alignment issue although not enough to stop the carbs from being fitted. But, as the insulators are numbered and if fitted correctly, still leaves the divots on 1 and 4 a mystery.

Offline Nurse Julie

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Re: Carburettor Insulators
« Reply #42 on: October 25, 2018, 08:46:24 PM »
I suspect Julie that the insulators are handed slightly, in that the outside/inside ones may bend very slightly inward, hence why different part numbers and why they are numbered. You may not have noticed any problems getting them engaged with the carbs as they are such a bitch to fit anyway or maybe you did notice but just thought it was normal.

Got to say I'd forgotten about the numbers on them, only really a problem if you remove them for head work etc. Of course Trig will say he knew Julie, he's a man and men don't like to admit they didn't know something even if he really didn't know.

What we need now is someone who has a 400 head off and will fit the insulators incorrectly and then correctly and post pics of them in both cases so we can see if there is an alignment issue.
I have just been given a lecture on these things and again my assumption was wrong. I thought cylinder 1 would have a rubber on with the No.1 showing uppermost, cyl 2 with a No. 2, cyl 3 with a 3 and cyl 4 with a 4. But, that may not be the case but i wont know until i actually get them in their correct 'pairs' i suppose. Trig did know, because although they are a different design, the CB750 ones are also numbered.
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Offline Deano400

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Re: Carburettor Insulators
« Reply #43 on: October 25, 2018, 08:49:48 PM »
You are right Julie.
No. 1 will have 1 at the top 4 at the bottom.
No. 2 will have 2 at the top 3 at the bottom.
No. 3 will have 3 at the top 2 at the bottom.
No. 4 will have 4 at the top 1 at the bottom.

Davelu88

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Re: Carburettor Insulators
« Reply #44 on: October 25, 2018, 08:57:42 PM »
Anyone know what the divots are for ;D ;D ;D ;D ;D ;D

 

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