Carburettor Insulators

[Laverda Dave]

Opp's my last post contained a Senior moment..... If you take the petrol tank off you should be able to see the tops of all the insulators and there all the numbers..... Simples 

[Deano400]

Have now found the numbering after reading Laverda120's post. Would still like to know what the divots are for though on two of them.

[Davelu88]

Just looked at mine and apart from the 1 and 4 cut away which I guess as others have said is for grip I can't see any difference

[Bryanj]

The divots are where the golf club missed

[Nurse Julie]

Ok, I have had a proper look and rummage now. The flat sides face each other on carbs 2 and 3. When everything is in place, the big fat breather pipe from the top of the engine goes down between carbs 2 and 3 and through to the air box assembly. Without these two flat spots, the pipe would be very, very to get through, almost impossible by the looks of it, so this design stops the pipe from getting crimped.

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[taysidedragon]

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.

[Nurse Julie]

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?

[paul G]

See attached 

[Nurse Julie]

See attached 

That's what I have been looking at Paul in my manual, what route does yours take?

[paul G]

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 

[Nurse Julie]

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.

[taysidedragon]

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. 🔧👍

[Nurse Julie]

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  My 400/4 is off the road now for the winter so i will add that to the fettle list.

[taysidedragon]

They are 2 types. One is marked 1 and 4, the other marked 2 and 3. It depends which side you're looking at.

[taysidedragon]

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!