Help required on RS125 Carb & Floats after being stood.

Sibon73 · Two Stroke Sniffer Joined: 24 Jun 2011 Karma :

Hi

My 2001 Aprilia RS125 has been stood 3/4 weeks after an extremely early arrival in the family and me being off work.

Not having a great deal of knowledge on bikes I did not empty the tank and just started it every now and again to check it still turned over.

Now I am back on it I found that it was very sluggish up to 5/6k revs, it spluttered it's way through the range but went fine after 6k. I actually think it went better / faster than I remember at the top end. Having a read through some posts I stripped the carb and cleaned the jets, new fuel in the tank and this has rectified the problem. The spluttering stopped but the top end is not as quick as it was when it was spluttering.

My question is can I adjust something to give me the top end power back. Also I did notice that one of the floats in the carb had what I'm guessing is fuel inside - is this normal or should both have something in? Or both have none in?

It is full power and I use a BR9ES plug which looked fine after a plug chop this morning.

Thanks
Simon

P. · Red Rocket Joined: 14 Feb 2008 Karma :

How full power are you, power valve, exhaust... the whole hog?

BR10 plug will probably benefit you more.

My RS had an indicated 100ish top speed with the PV jammed open. 3/4 weeks stood is nothing really and starting it up and just blipping it could start fouling the plug.

Sibon73 · Two Stroke Sniffer Joined: 24 Jun 2011 Karma :

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Tried setting the fuel to RES rather than ON?

Try a BR10EG plug also... I had one in my RS and that wasn't "full" it just had the PV jammed.

Sibon73 · Two Stroke Sniffer Joined: 24 Jun 2011 Karma :

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Sibon73 · Two Stroke Sniffer Joined: 24 Jun 2011 Karma :

Picked up a BR10, going to pop it in at lunch, went home set on reserve last night, no difference there. Starting to think it's something to do with the power valve, I cleaned the blade the same time as I did the carb as it had a bit of build up on. If this was sticking could that have been why it was spluttering in the low rev range then fine at the top end? Confused

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Could be... but im not so sure. My PV was jammed open permanently and I never got any spluttering at all.

Did you put the PV back in the right way.. not upside down?

Also when you pop the BR10 in...let us know the colour of your spark plug when you remove it Thumbs Up

Sibon73 · Two Stroke Sniffer Joined: 24 Jun 2011 Karma :

P. · Red Rocket Joined: 14 Feb 2008 Karma :

There are ways to jam it open... Unsure how mine was done, but I had top end.. not a fantastic mid range at all Laughing

Tapered edge down is correct. https://flexiweb.atspace.com/rs125/3.jpg

Sibon73 · Two Stroke Sniffer Joined: 24 Jun 2011 Karma :

Plug swapped, the BR9 plug was sooty dry black in colour, i'm going to strip the carb again tonight (hopefully), and empty the float that looks to have fuel inside Confused

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Black would suggest its running a bit rich, maybe over oiling... but see how the BR10 does you Thumbs Up

Sibon73 · Two Stroke Sniffer Joined: 24 Jun 2011 Karma :

I think i've narrowed it down to the carb floats, spoke to the chap who I purchased it off and he says no fluid should be in the float. So ordered a new set which arrived today so back off with the carb again tonight Rolling Eyes

Going to leave the BR10 in, see how it is once the carb is functioning normally Thumbs Up

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Sibon73 · Two Stroke Sniffer Joined: 24 Jun 2011 Karma :

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Yea, should be empty.
Must have a hole somewhere in there.

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

aye a faulty float would cause it to flood.
____________________
Some shite cruiser. Now with guns and FREEDOM!

Sibon73 · Two Stroke Sniffer Joined: 24 Jun 2011 Karma :

New floats in and set and it was a lot better on the low end performance this morning. Didn't really get a chance to open it up due to the flipin wind. Checked the plug, was a little black again but I haven't been riding it to it's potential since noticing the faulty float. But it's definately back to how it was at low revs.

Will get it to the top end range tonight, see if the power is there!

Put the choke on this morning to hear "click" Shocked

and yes either the cable has snapped or something in the lever.......I went from being quite proud of my self being a noob to bikes and sorting the carb to being gutted........least it's something for the weekend!

Cheers for all the advice Paddy Thumbs Up

Sibon73 · Two Stroke Sniffer Joined: 24 Jun 2011 Karma :

and I thought it was sorted.... Sad

New plug - BR10
New Float set at 24mm
Stripped and cleaned the carb
Cleaned the PV blade
carb needle set on middle notch

But revs are bogging at 5-6k! up to that point and beyond seems to run fine. One thing I have noticed is that the PV blade isn't doing the self clean around 2k but it does feel like it is working 7/8k. Can the cable play be set wrong at the solenoid?

If I go through the gears into top gear giving it a bit of welly as soon as I start to ease off, the revs drop and struggle to get back up without down shifting. Is this just a case of RS's wanting to be revved?