Aprilia RS 125 Full Power, 9000rpm problem???

dicknose139 · L Plate Warrior Joined: 28 Sep 2012 Karma :

hi all, im new to this forum.

i have an aprilia rs 125 full power 2005, bike was running sweet until a few weeks ago. now all of a sudden it doesnt like going up to 9000rpm, it just bogs down until i ease of the throttle. things ive done that may have caused it are;

had an oil leak from somewhere, ended up being from the oil pump, took the oil pump cover off and the bolts that hold it on where just sitting at the bottom of the casing. got it back on no problems. i think since putting the oil pump back on, it might of adjusted itself? maybe thats why the bike is bogging down at around 9000rpm?

had the power valve blade out and cleaned it but nae sure if i put it back in the right way?

ive changed the cdi to a new unrestriced one (old had been deristricted badly), and got a new power valve ecu, coils, fuses, spark plug, spark plug cap and HT lead, bike was running fine with all this new stuff on it.

ive had the carb off and cleaned it, had the air filter off and cleaned. cleaned the fuel filter aswel. had the petcock out and the and the pipe that goes into the tank that connects to the fuel tap was snapped? would that cause the rpm problem? maybe there is air getting in the pipe?

actually have no idea whats wrong? please help. any advice would be fantastic. loves this bike and dont want to have to sell it for spares or repairs.

cheers guys
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C.McLellan

Priliars125 · Two Stroke Sniffer Joined: 24 Sep 2012 Karma :

Pv blade I'd say just take out and check that the flat side is at the top Smile

dicknose139 · L Plate Warrior Joined: 28 Sep 2012 Karma :

ok dude will give it a try tomorrow.

cheers
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C.McLellan

Matt- · World Chat Champion Joined: 19 Jul 2012 Karma :

power valve blade's cannot be put in wrong, i don't see how a power valve blade would wear that much in SO little time, some aprilias powervalve blades last for age's, all depends on the use of the bike, it could be a numder of problems, if it has been recently fitted with any performance part it may be the problem, but as it was ok then just went to 9000 it's strange.

Are you sure the powervalve is fully de restricted and is not limted ? you may have been sold a dud if your are sure it's a full power powervalve then:

i would check is the carb is cleaned correcly and the needle jet valve is working correctly, also check that air filter is clean and tidy, if that doesnt work i would suggest, taking out the REED block, looking through it and seeing if their is any gaps. if it's ok and the membranes are sealing onto the block, it's ok Thumbs Up

Also on a side note make sure you have clean fuel.

Good Luck

Matt
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Current Bike's - Road Legal TZR 125 Pitbike, Aprilia SR50R 2010

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

Matt- · World Chat Champion Joined: 19 Jul 2012 Karma :

emdell · L Plate Warrior Joined: 18 Dec 2011 Karma :

does it rev cleanly when not under load? i.e if it's in neutral will it rev past 9k easily?

when you say bog down - does it start to splutter or does it feel like it's hitting a wall?

dicknose139 · L Plate Warrior Joined: 28 Sep 2012 Karma :

no even in neutral it it doesnt rev past 9, its like it is red lining at 9000rpm when i give it full throttle in neutral.

it just splutters like crazy, and i lose power until i ease off the throttle.

i checked the power valve yesterday and it was in the right way round, not sure if its actually working though? i dont have a voltage meter/amp meter.

it also smokes quite a bit on start up and when its warmed up and on idle, goes away.

think it might be running rich.

heres my setup;

34mm carb, pipercross cone airfilter, standard exhaust with arrow end can. the carbs main jet is a 165. is it too big??

cheers for the help so far guys
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C.McLellan

anthony_r6 · World Chat Champion Joined: 31 Mar 2011 Karma :

You can get a multimeter for <£10 - I suggest you go get one if you think it could help. Any way of getting a video up of it?
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thomp1983 · Crazy Courier Joined: 05 Feb 2011 Karma :

with the weather begining to turn now are you sure your not suffering from either carb icing or your cone filter being wet?

chris

mr jamez · World Chat Champion Joined: 04 Aug 2003 Karma :

Your original post is not very clear on what has happened in what order. Was the bike running fine after you had added the new ECU, valve controller etc?

I am assuming you cleaned out the filters, discovered the snapped pipe etc after the problems started?

I'd double check the oil pump is set correctly and you have the power valve blade the correct way up. Also this "snapped pipe" is it the fuel hose or does the RS125 have a vacuum fuel tap?

Also cone filters can cause all sorts of problems with the mixture.
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Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Possibly the power valve, although I would expect it to just feel flt at higher revs if in upside down. Possibly the valve not opening, in which case I would expect it to be gutless from about 8k, and might well drop right off by 9k.

Beyond that check the main jet is clear and possibly find somewhere quiet and use a strobe timing light to check the ignition timing isn't doing anything silly at high revs.

Loads of other things it could be, but those are probably the most likely and easily checked things.