cracks in carbs ?

troutbishop

troutbishop

Hero member
Location
Worcestershire England
Hi all I m putting a bike together for someone else and have found a crack in the one carb body at the bottom where the clamp is . Does this cause problems or does the plastic sleeve seal well enough?
                                    cheers Kev
 
sorry Kev it is scrap
but take a very very close look, because casting flaws can look very like cracks, it is caused by "wiggling" the carb bank up and down in order to get them off the stubs, what I try and remember to do is lubricate them on assembly, with a smear of grease or a wipe with light oil, or maybe even WD40, then they just slip off later when needed.
CLEM
 
CLEMTOG said:
sorry Kev it is scrap
but take a very very close look, because casting flaws can look very like cracks, it is caused by "wiggling" the carb bank up and down in order to get them off the stubs, what I try and remember to do is lubricate them on assembly, with a smear of grease or a wipe with light oil, or maybe even WD40, then they just slip off later when needed.
CLEM
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Where can I get this magical grease,light oil or specialist WD40 from as the stuff I've got seems to bond the carbs to the manifolds :(

                                                    Dave
 
CLEMTOG said:
sorry Kev it is scrap
but take a very very close look, because casting flaws can look very like cracks, it is caused by "wiggling" the carb bank up and down in order to get them off the stubs, what I try and remember to do is lubricate them on assembly, with a smear of grease or a wipe with light oil, or maybe even WD40, then they just slip off later when needed.
CLEM
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I never had issues getting them off, only getting them on or keeping them in position. Had a ride on a truck back from a Laverda meeting, as the Keihins kept falling off the rubbers...  >:(
 
Laverdalothar said:
I never had issues getting them off, only getting them on or keeping them in position. Had a ride on a truck back from a Laverda meeting, as the Keihins kept falling off the rubbers...  >:(
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I think Kev is talking about the alloy mount over the inlet stub type carbs rather than the later rubber mounted ones. The alloy mount ones can be a bit of a struggle to get on and off, unless all is clean as a whistle and lubed up.

New plastic liners help as they are not chewed up, but can't find anyone who still have them (Dellorto list them as discontinued  :( ).

Pete
 
Poffer said:
New plastic liners help as they are not chewed up, but can't find anyone who still have them (Dellorto list them as discontinued  :( ).
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anyone with a half decent lathe will have them shortly after they are needed  :D
is what I do, make my own

Wolfgang has them in stock

 
redax5 said:
anyone with a half decent lathe will have them shortly after they are needed  :D
is what I do, make my own

Wolfgang has them in stock
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Thanks Red. I don't have a lathe, but I do have a phone, so will give Wolfgang a shout  ;)

cheers

Pete
(BTW- you do realise you are replying to a Dellorto thread?  Don't worry, I won't tell anyone  :D )
 
Common breakage, that or the inlet manifolds. Easily avoided. When fitting your carbs loosen the inlet stubs, push the carbs fully home onto the stubs then nip the nuts up you will then find they come off and on a lot easier in future.


  Keith.
 
this situation is easy enough to faff up and bust your carbs, but it is made much worse by aftermarket alloy inlet stubs turned from billett, which I always though was like an ingot,(Cam please blow this myth) as the ones that I have bought are a splendid thing, well made (up to a point) and very cheap, but all of them I have used have had the inlet stubs a little too big, which make for busty carb inlets, mine have all needed about 4 to 6 thou turning off to make them (individually) a nice sliding fit, but a good job that they dont come too small, making them bigger would noit be easy.
CLEM
 
yes yes, thank you both,that makes it very clear, what I was trying to convey is that when someone says that an item is made from "billett"  they are trying to inform you that it is a type of metal,ie the material, such as brass or iron, when it is not, it is part of a process in making a metal to a given form/size.
CLEM
 
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