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post #1 of 9 (permalink) Old 09-13-2019, 03:03 PM Thread Starter
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2001 st 955i woes new owner

Having recently acquired the above bike as a winter project,I thought I would change the fuel filter,plugs etc etc due to a sketchy/non existent service history.

I drained the tank and removed the fuel pump and assembly and found a lifetime of crud !







Do any of the members here have an idea of what all of this may be ?

thanks in advance for hopefully helping a new boy !
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post #2 of 9 (permalink) Old 09-13-2019, 04:15 PM
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Hard to tell, but it surely doesn't belong in there!

Wipe it all out, change the filter (Don't buy a Triumph one - look at the alternate parts thread!) and button it back up.

Don't overtorque the pump plate bolts. And, if you have plastic fuel disconnect fittings, replace them with stainless steel. Many threads on the subject.

Also, take a small drill bit and (using your fingers) clean out the two nipples on the side of the tank. One tends to clog with mineral deposits.

Welcome to the Forum!

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post #3 of 9 (permalink) Old 09-15-2019, 02:53 AM
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I got a 2001 st which is very poorly at the moment...
After seeing your photos I think I shall add this to my long list of things to do....
Let us know how you get on....
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post #4 of 9 (permalink) Old 09-15-2019, 03:09 AM
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обычный мусор , хорошо что бак пластиковый . просто вымыть .

ordinary rubbish, it's good that the tank is plastic. just wash

Last edited by MileHighScottie; 09-15-2019 at 02:07 PM.
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post #5 of 9 (permalink) Old 09-15-2019, 08:01 AM
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Yep had same problem.
Its the great fuel we have today along with petrol stations worlds best practice.
Bought new everything from a Car Auto Place.
Used Longer Flexible hose to fix the filter inside.
Toyota 45 psi Fuel Pump is the same.....as are many other makes.
The old one worked fine , but was rusted up and gauze filter was past used date.
Flush system well.
I repainted the pump chassis as well. Worth the time.
Never have the same problem again.
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post #6 of 9 (permalink) Old 09-15-2019, 07:47 PM
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For this fuel pump, would you have a part number (or models that it fits) for this Toyota piece?
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post #7 of 9 (permalink) Old 09-16-2019, 05:52 AM Thread Starter
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Ok,
Thanks so far for advice and pointers,I've ordered an aftermarket fuel filter to avoid the cost of the Triumph one.Close inspection shows that the crud in question is alloy shavings and particles of hard red plastic !
I intend to clean the injectors next,other than taking them to a specialist cleaning firm are there any workaround solutions to doing this ? I've changed the plugs and the old ones are very "sooty" trying to also tell me something I guess as well.
No service history with the bike as previous owner got it from a family where the owner had passed away,it has only been started once recently which was when I went to collect it,it ran briefly on what appeared to be two cylinders and produced a lot of smoke !
Also when you switch the ignition on as the fuel pump primes there is this odd keening noise which I suspect may be the fuel pressure regulator ? Should I be renewing this ?

Cheers for advice so far
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post #8 of 9 (permalink) Old 09-16-2019, 09:26 AM
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Fuel pump priming 'moan' is normal. It is the regulator valve chattering.

I'd hold off on taking the injectors anywhere - you'll probably find that a good load of fresh fuel with a healthy dose of Seafoam, B12 Chemtool or the like will fix the problem.

Make sure your air filter is clean.

The Gen I 955's ran very rich on start-up, so you may be seeing normal behavior.

Check the Idle Air Control Valve hoses. They are corrugated vinyl, with 'Play-Doh' ends that rot and crack. Replace them with vacuum hose, either 1/4" or 6MM. Make sure you use enough hose to avoid kinks.
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post #9 of 9 (permalink) Old 09-16-2019, 10:34 AM
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I would say that checking the injector pattern might be a good thing to do as well as comparing the flow one to each other.
The common fuel filter is KL145. But I guess you already found out.


For an unknown maintenance record I would:
-acquire a cable for TuneECU and download it

-Check the valves (shims are easy to change on the gen1)
-balance the throttle
-seek a gas analyzer and adjust the idle CO using TuneECU
-clean and lube the rear hub. Maybe change the bearings
-clean and lube the suspension linkages. Maybe change the bearings if needed
-check the fuel fitting and change them for metal one if needed
-change the brake fluid
-change the coolant after rinsing the circuit
-As pushr0d mentioned, double check the IACV hoses for cracks and change them for silicon one if needed


I wouldn't swear it but I think your IACV should be the same as the gen 2, that is affixed to the air box.
As said the body or the "ears" may fracture. So it should be checked as well.


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