Can you believe this

[Lucky_Lou]

Further investigation of my carb problem(see my post lacking power)
i found the problem wasnt as bad when i had some choke on,so i pulled the carbs to recheck the jets i decided to lift the needles to see if this helped and was suprized to find one of the diaphragms popped out and wouldnt relocate as it had expanded.
Bear in mind these have less than 200 miles on them from new(see image) when i complained to motorworks about this they didnt hesitate to replace them FOC but it begs the question how many more are there like this one out there
Lou

[Andy-Gadget]

The silicon rubber of the diaphragms absorbs fuel and expands, as you have found out, a PITA, but fixable.

If you need to work on the carbies on the side of the road, it is only four more screws to have the diaphragms off as well.

I carry a spare pair of diaphragms with me for just this scenario, but at home there is another fix.

I bake the fuel out using an electric oven with the door just cracked to allow fumes out, takes about an hour, this is loose diaphragms only, not slide and diaphragms.
I have done similar to the rubber mat in calculators, after spilling kerosene on it, same problem of swelling, same fix, but with an electrode oven providing the heat.

[Lucky_Lou]

Cracked it fitted new diaphragm today lifted the needles one notch and whent out for a spin spot on,
Lou

[montmil]

While understanding your bike is a Euro model; what needle clip position cured your ills?   Monte

[Lucky_Lou]

4th from the top but now im having further problems with fuel starvation the fuel tank was steam cleaned but i keep getin cr*p blocking the inlet pipe to the fuel tap and reserve pipe surely there is a filter that will fit over these to stop this happening again?? if anyone knows if there is one out there please let me know
Lou

[Bob_Roller]

There are fuel taps with a fine mesh metal screen over both pick-up tubes.

I think they are brazed, or silver soldered to the fuel tap .

The debris that keeps blocking things up, is it the red coating in the tank, or other accumulated 'grunge' in the tank ?

[steve hawkins]

If I recall, my 1979 R65 fuel tap had a metal gauze filter that went over the top of of the pipes inside the tank as described above.  

However in my 1982 R100, the filters are integral to the tap and are very much smaller.  It caused some confusion recently when I had fueling issues with my R100.  That was predominantly caused by water in the float bowls when I ran the fuel level very low.

I would recomend removing your tank form the bike and draining it completely.  Remove the tap - strip and inspect, see if the filter is either integral in the tap or goes over the top of the pipes in the tank.

Either have the filter as a part of the tap or put an external inline filter.  No need to run both though.

Then get a hose pipe and flush the tank through, with a view of flushing out the crap in the tank.  Empy the tank of all water, and let it dry out - get a flow of warm air through it or leave it in the sun.

You should be able to get an idea on whether you need to take any further action at this point (sealers, etc), depending on what comes out of your tank.

New fuel hose might be in order as well, if it is old.

[Lucky_Lou]

There are fuel taps with a fine mesh metal screen over both pick-up tubes.

I think they are brazed, or silver soldered to the fuel tap .

The debris that keeps blocking things up, is it the red coating in the tank, or other accumulated 'grunge' in the tank ?

Ive fitted a new fuel tap it appears to have filters in the pipe ive fitted an external filter with the intention of flushing the tank out and removeing the filters in the fuel tap line,,,,,,,the debris appears to be fine reddish powder (rust presumabley) there are no leaks and all new fuel lines but the stuff apears to block the pilot jets so my get out of jail card has been to put the enricher on the first notch pull the fuel line off and blow back into the tank  this usualy gets me home.It only happens when i fill up so there must be crap floating about in the tank
Lou

[Justin B.]

Be advised that the factory tank lining is red in color and a lot of what people find clogging up the works is little bits of liner...  Next free weekend you have you might consider re-lining the tank...

[Lucky_Lou]

Be advised that the factory tank lining is red in color and a lot of what people find clogging up the works is little bits of liner...  Next free weekend you have you might consider re-lining the tank...

Looking in the tank there is no evidence of any lining just bare metal? if i where to fit some kind of protective liner , what is availiable.....ive fitted a stainless steel gauze mesh tube over the fuel pipes (will post a photo later)in the tank incase ive not got all the crap out but i would be intrested in lining the tank if possible.
Lou

[Justin B.]

There are several available over on this side of the pond, maybe where you're at as well.  Of all of the products I've used I would have to say that POR15 has been about the best.  There is a company called Caswell Plating that makes an epoxy based liner that looks quite interesting and both of these cost about the same for a kit - $30 - $40 USD.

Since you have bare metal (rusty, no doubt) you can use muriatic acid to completely get rid of the rust.  On the last tank I did it took about an 11 hour soak to accomplish...