Keihin FCR parts suppliers in U.K.

Chaps, any recommendations for FCR parts suppliers in U.K.?

I would have thought Allen’s Performance, but I can’t get them to answer the phone.

I‘m dubious about using eBay as there‘s loads of Chinese knock-of shite on there.

Don’t want to buy from EU and wait weeks.

Any suggestions ?

Fast Eddie said:

Chaps, any recommendations for FCR parts suppliers in U.K.?

I would have thought Allen’s Performance, but I can’t get them to answer the phone.

I‘m dubious about using eBay as there‘s loads of Chinese knock-of shite on there.

Don’t want to buy from EU and wait weeks.

Any suggestions ?

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Whad're'ya after Nigel?
Edit - I should say "have you worn them out already?"

you could try P & M , as they supply triples with CR carbs, maybe they deal with FCR - 0208 847 1711

trident sam said:

you could try P & M , as they supply triples with CR carbs, maybe they deal with FCR - 0208 847 1711

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Thanks, will try them.

robs ss said:

Whad're'ya after Nigel?
Edit - I should say "have you worn them out already?"

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No, not worn out. About the only thing that looks worn is the needles, and I think that’s due to not running air filters.

Main requirement is just needles and service kits. I have a problem with the RH carb flooding badly and pissing fuel (some of which pisses it’s way into the ports too… not good for petrol wash).

I have a hypothesis as to what the cause is, and if I’m right the service kit will fix it.

I phoned them about 3 weeks ago. Hello me duck said the man, took me back to my student days in Nottingham in the 70's, bikes, beer, music and women (7 to 1 ratio reputed which I can believe!!). I digress, the phone was answered promptly, it might be their holidays? Eh up me duck, keep trying maybe

I just spoke to them me duck !

Poor bloke is just rushed off his feet.

Parts on the way though. So all good me duck.

As mentioned above, fuel was pissing out of the air jets (see below). I can only conclude this was due to float chamber flooding.

I checked and cleaned the float needle, then swapped them over, all to no avail.

So my hope is that the float needle seating O ring (see below) was passing fuel, therefore bypassing the float needle and flooding the float chamber.

I‘ll go through them thoroughly with the service kit items and keep my fingers crossed that the buggers hold fuel !

These are the air jets where the fuel was egressing:


This is the float needle seat, it is sealed by the O ring showed. This O ring looks very hard and very much flat sided. I’m hoping this is the cause of the leakage:

If the float chamber floods, fuel would come out of the float chamber overflow up top between the carburetors. It must be a very minimal leak, or fuel is spitting back and drooling down around the slow air adjuster and air jet.

Did you remove the linkage to the accel pump? I won't do it, but wonder how well it works with the quick turn throttle and the jetting the FCRs come with.

Not on your side of the pond, but P&J Motorsports in Oregon USA makes velocity stacks for the FCRs that cover the slow air adjuster and air jet like the air filter adapters that come with the Sudco carburetor kits. Might keep a little bit of junk from getting in there, and would keep fuel from drooling out around those air jets. You wouldn't be able to play with the slow air adjustment screw though without removing the stacks and dealing with those skinny rubber gaskets. Might be pricey with VAT and shipping. Could just be pricey in general, because velocity stacks are their bread and butter.

Can we keep the language simple here please? Having a thought for the international audience!

Was the fuel 'egressing'? or just plain pissing out?

Anyway, I thought an Egress was a bird a lot like a Heron!

The Mikunis on a GSXR 750 SRAD have float needle seats with O rings very much like the one you show in your picture.

The O ring does not seem to be a common size, and they don't supply the O rings separately either. I had to change all 4 of them twice on my SRAD, an expensive business, and mainly due to lack of use, they harden sitting in the fuel that is going off!

SteveA said:

Anyway, I thought an Egress was a bird a lot like a Heron!

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Umm... that would be an Egret.

Schwany said:

If the float chamber floods, fuel would come out of the float chamber overflow up top between the carburetors. It must be a very minimal leak, or fuel is spitting back and drooling down around the slow air adjuster and air jet.

Did you remove the linkage to the accel pump? I won't do it, but wonder how well it works with the quick turn throttle and the jetting the FCRs come with.

Not on your side of the pond, but P&J Motorsports in Oregon USA makes velocity stacks for the FCRs that cover the slow air adjuster and air jet like the air filter adapters that come with the Sudco carburetor kits. Might keep a little bit of junk from getting in there, and would keep fuel from drooling out around those air jets. You wouldn't be able to play with the slow air adjustment screw though without removing the stacks and dealing with those skinny rubber gaskets. Might be pricey with VAT and shipping. Could just be pricey in general, because velocity stacks are their bread and butter.

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Accelerator pump linkage was only removed as part of the fault finding, I don’t run it like that (although robss does and is happy with the way it runs).

I have often wondered why the overflow is all the way up there on these carbs? Liquid will always take the path of least resistance and by definition a carb is full of holes (jets), so I’ve often thought that fuel is likely to find many other ways out… or worse, into the engine, before it made its way up and over that overflow route! I can assure you that one of those air jets in each carb has a direct passage to the float chamber, I know that from my time spent squirting carb cleaner everywhere I could! So it is a definite path for fuel that’s overflowing.

Those velocity stacks you mention do not actually block the air jets. They are like the air filter adapters I have (shown below), they re-route the air passage so the air jets take air from the main air intake on the carb. So, if I‘d had these filter adapters fitted I would not have seen the fuel leaking out as it would have trickled its way down the port and into the engine instead. Whether it would have caused a hydraulic lock or petrol wash I don’t know, but it’s not a pleasant thought …

SteveA said:

Can we keep the language simple here please? Having a thought for the international audience!

Was the fuel 'egressing'? or just plain pissing out?

Anyway, I thought an Egress was a bird a lot like a Heron!

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Which is the cause of your umbrage sir, pissing or egressing ?

Fast Eddie said:

Which is the cause of your umbrage sir, pissing or egressing ?

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I rarely take umbrage sir!

But I do seem to have a preference for 'simpler' language these days, though my wife seems to complain about my use of it more than she did!

I come from the world of fast jet aviation, fighter pilot training systems, we had 'rapid egress procedures' which means getting out of the cockpit damn quick before something nasty that might happen, actually happens.

We also had 'rapid egress systems' typically used to facilitate egress in flight, or at least in forward motion, when something nasty has already happened, some call them ejector seats!

In my mind fuel tends to 'piss' rather than egress, mainly because it is always annoying when it does!

But hey, a dictionary or thesaurus would confirm your usage!

Fast Eddie said:

No, not worn out. About the only thing that looks worn is the needles, and I think that’s due to not running air filters.

Main requirement is just needles and service kits. I have a problem with the RH carb flooding badly and pissing fuel (some of which pisses it’s way into the ports too… not good for petrol wash).

I have a hypothesis as to what the cause is, and if I’m right the service kit will fix it.

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Have you tried disabling the pumper yet, as I did.
I found no harmful effect on performance - although a 920 might - in which case you could "tune" the length of the actuating rod.
Might actually get better performance and less flooding?

robs ss said:

Have you tried disabling the pumper yet, as I did.
I found no harmful effect on performance - although a 920 might - in which case you could "tune" the length of the actuating rod.
Might actually get better performance and less flooding?

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No, not yet. But it’s on my TTD list.

Not very important, but I think you may find you are agreeing with me if you re-read what I said about the velocity stacks.

Here's something else to egress on:

Cold starts on my P11 without the FCR accelerator pump would be drawn out. The accelerator pump causes no ill effects on my 750 motor. It runs as well as fuel injection did on the fuel injected bikes I've owned. Mileage is excellent, plugs are clean, and it scoots right along for a little 750. No point messing with success.

Egrets

Schwany said:

Not very important, but I think you may find you are agreeing with me if you re-read what I said about the velocity stacks.

Here's something else to egress on:

Cold starts on my P11 without the FCR accelerator pump would be drawn out. The accelerator pump causes no ill effects on my 750 motor. It runs as well as fuel injection did on the fuel injected bikes I've owned. Mileage is excellent, plugs are clean, and it scoots right along for a little 750. No point messing with success.

Egrets

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Agreed ref the accelerator pumps helping starting, but having the e start on mine kinda negates that to a degree.

I‘m just intrigued I guess and I did think last time I was on the Dyno that those pumpers certainly don’t help with fine tuning of the carbs! So I was at least considering disconnecting them next time I venture into the Dyno.

Not in any hurry tho…

Fast Eddie said:

Agreed ref the accelerator pumps helping starting, but having the e start on mine kinda negates that to a degree.

I‘m just intrigued I guess and I did think last time I was on the Dyno that those pumpers certainly don’t help with fine tuning of the carbs! So I was at least considering disconnecting them next time I venture into the Dyno.

Not in any hurry tho…

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Commando owners would have a much better chance of making the FCRs work without the accel pump with the canted forward engine and more downdraft. I need the accel pump on the vertical motor. But, more to the point, I don't want to spend 3 months tuning the carburetors after removing the accel pump.

I've never had any vehicle on a dyno. Is information gathered from idle through shifts to a predetermined RPM in each gear, or do you only take a reading starting in a specific gear to the max RPM? That is how little I know about the dyno.

When I was tuning and porting my 2 stroke dirt bikes I used long hill climbs as a dyno test. Street bikes just seat of the pants and being able to move up front easily on long straights and sweepers. Dangerous and stupid street stuff only.

The accel pump would only effect a small chunk of the power output. What were you seeing on the dyno that pointed at the accel pump? I'm not trying to hand out anymore unsolicited advice here (terrible habit), I'm just curious.

I used to have a short flabby spot between shifts applying WOT, but I fixed that. Not saying how, because I don't do technobabble and it's more instinct and discovery than anything else, and somebody is bound to say "that's wrong" even though they have never owned a set of FCR carburetors or a P11. damn internet.