RS 125 oil pump

[stirlinggaz]

hi all,
can anyone give me some advice on how to adjust the oil pump on my Aprilia rs125?
when i refitted carb & started bike up, i let it idle for a minute or 2, then to my horror, i realised that i hadnt re-connected up the 2t oil pipe to the carb! doh!
anyway, while i had the pipe in my hand, i noticed that there wasnt any oil coming out?
even when i opened the throttle a little, nothing came out.
so i removed fairing, to discover the oil pump adjuster nut was hanging off!.
anyway i screwed it back into the rubber mounting, & the alignment marks look ok.
but when i turn the adjustment nut, either way, marks dont seem to move either left or right?
anyone tell me how much 2t should be coming out of the feed pipe into carb?
ie - would i be able to see it come out, a trickle, a drip or what?
& how do i turn pump up? as i dont seem to be using any oil!
the adjuster nut is the same type as on a clutch lever.
so do i tighten it down/in or loosen it off/out?
where would alignment marks be if it is turned up?
top mark to the left or right?
im sure all this makes sense to someone who has taken the cover off the oil pump recently!
anyway, any advice welcome,
cheers,
GAZ

[Vincent]

I'm not that familiar with the RS pump but if you've had the feed pipe off the carb you need to bleed the system. You usualy do this by opening the oil pump to maximum flow manualy while the bike is at about 2k RPM until all the air is expelled from the pipe. Be careful, don't let it run too long without oil or the whole motor will melt. If you're unsure if the oil is getting through check for blue smoke coming from the exhaust, cup your hand over the end of the pipe and you should see and smell the oil residues. Sorry, without pics or more info, I can't help with the adjustment.

[stirlinggaz]

[Vincent]

The bleed screw on the pump just bleeds the pump only. You need to get the air out of the pipe that goes to the carb too. That's right what you say about the cable opening up the pump - more throttle, more oil, but the cable has be adjusted to open the pump the right amount according to the amount that the throttle is open. There might be two markes on the pump body and the pulley that the cable connects to that line up on full throttle. Sounds like you need to make sure that the pump is together right after the adjuster nut came loose. Someone should be along with more info on pump adjustment

[stirlinggaz]

[Kickstart]

Hi

Very little oil is pumped out. Quoted at 0.9% to 2%, so a tiny amount compared to the fuel you use, and at idle you are only using a tiny amount of fuel.

You can try holding fully open the operating lever on the oil pump while it is idling to push the oil through more quickly to check it is working.

All the best

Keith
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[Vincent]

Aye, it's a very small amount, open the pulley on the pump at tickover and check the exhaust to make sure the oil is getting through. When you open the pump by hand smoke should be realy visible out the back.

[Blau Zedong]

If you hold the pump at full stroke with the engine running and feed pipe off (not for long obviously) you should see oil "pulse" from the end of the pipe....only a couple of mm at a time though.
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[ms51ves3]

[Vincent]

[stirlinggaz]

Hi,
thanks for all the replies.
i like the sound of premix, just as a temp measure.
have i picked this up right, if i connect oil feed pipe back up to carb.
start it up,
then open up oil pump by moving the pulley by hand,
this should force more oil thru?
& i should see the difference in the smoke coming out of exhaust?
sounds pretty simple?
would i do any harm by just adding a little 2 stroke strait into fuel tank?
or am i being stupid/too cautious?
cheers,
GAZ

[Kickstart]

Hi

Note that if you run pre mix then in theory you have leaned the mixture off (the volume of oil is replacing the same volume of petrol). So don't thrash it running on premix unless you have adjusted the mixture to compensate. Should be fine for low speed / idleing use, just make sure you lob in plenty of normal petrol afterwards.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[stirlinggaz]

Hi,
thanks for that tip.
i was only thinking of putting a little 2t into tank as a temp measure.
wouldnt be for long & wont go too hard on it!
i think i worry too much!
just gonna tip a little tts into tank & take it from there.
i reckon if cable is working the pulley at oil pump & the marks are lined up & theres oil in tank,
surely it wont go bang?
watch this space!
cheers,
GAZ

[ms51ves3]

When you tip it in shake your bike from side to side so that the oil mixes in with the petrol.

[stirlinggaz]

hi,
tanks off at the mo.
so was gonna tip in about 200ml of tts,
then fill it up with petrol from my jerry can.
give a shoogle & hope for the best!
cheers,
GAZ

[ms51ves3]

That should be good. Do you want to premix that much though? When your oil pump is working again you would have too much oil going into your engine and as Kickstart said it would run lean.

[Kickstart]

[stirlinggaz]

hi,
oops 200 ml , what was i thinking!
20ml, ok!
i actally thought it would be about 100ml,
but i get your point.
so i will bung in a couple of cap fulls!
cheers,
GAZ

[stirlinggaz]

edit,
i was thinking along the lines of -:
tank holds 13l of fuel,
put in 100ml-200ml of tts,
then fill up tank - 13l.
then just run it carefully till tank is about empty.
bike has been off road for a while so i dont know if everything is ok!
i have had cylinder head off,
drained coolant,
checked thermostat,
but as i mentioned, when i test ran it for a few miles,
it got very hot - 90 odd degrees!
was i thinking along the right lines with the oil in the fuel tank?
cheers,
GAZ

[Kickstart]

Hi

Right lines, but I would not use that much fuel. Do you really think you can avoid thrashing it for a couple of hundred km (how long a full tank can last when taken easy), plus if the pump is working then you are putting 2~3 times the amount of oil in that it needs.

If the pump had failed then then engine would seize. Unlikely it would cause it to overheat for long enough before for you to even notice.

Litre of fuel would be fine for the experiment.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[ms51ves3]

You could change the jetting in your carb for the duration that you are running it with the premix.
I would listen to Kickstart and only do enough so that you can fix your fuel pump.

[stirlinggaz]

HI,
ok.
thanks for the advice.
i was thinking of more than a litre of fuel,
simply because it wont start with so little!
for some reason (& i have heard other rs owners say the same) it doesnt like to get low on fuel!
as soon as i get on reserve , i fill her up.
as it can be a nightmare to get her re-started when really low on fuel!
reserve holds 3.5l.
tank is completely empty now.
so would i be ok with say 4l of fuel & 50ml of tts?
that way i know i can get it started.
go for a wee run & if all ok- just fill tank up?
that should dilute whatevers 2t is left in fuel tank?
i just want so make sure it runs ok- oil pump wise before i start worrying about the temp.
that way i can rule out the unlikely event the overheating is oil related.
then move onto coolant system!
as i have no idea why it is getting so hot!
cheers guys,
GAZ

[ms51ves3]

I think you may need a bit more oil for 4 litres.
50ml in 4 litres would make a premix of 1:80. When I premixed for my mopeds I did 1:25 or 1:32.

Linky

That gives you an idea of what to premix as 1:50 is 'DO NOT USE' and 1:100 is 'NEVER USE'.
You risk seizure if you use 1:80 so I would make a premix of 1:25 to be on the safe side.

[stirlinggaz]

hi,
thanks for the link!
very useful!
should be able to work out how much i should mix,
thanks again,
GAZ

[stirlinggaz]

mmmm,
ounces?
maths aint my strong point!
anyway if i go 1:24
=1000ml oil to 24000ml of fuel right?
this breaks down to 167ml of oil to 4 litres of fuel?
its been a long time sine i did any kind of maths in my head! lol
does that sound about right, tho?
cheers,
GAZ