Can someone offer any help?

[M1ke]

I just got this second hand 1999 RS125 (rossi replica)

Anyway its been ok for about 50-60km but now its having a few problems

I was over-taking a car in 3rd gear it was *just* reaching the power band (8000rpm) when it lost all power and eventually came to a stop (no matter what gear i shifted into) Anyway i pushed the dame thing home because I couldnt get it started again. After leaving it 20 minutes I had a go at starting it and it was fine until... I shifted into 3rd gear, reached 8000rpm and it did exactly the same thing. Its now having troubles at 2500rpm as well (stuttering/cutting out)

My first thought is that the power valve is sticking but would this also stop it from starting??

If it isnt the power valve what the hell is the problem?

Thanks in advance for any help you can offer

[TiN]

plugs?...airbox?...petrol?...oil?

Tin

[M1ke]

thanks for the quick reply.

Well i have checked the oil and petrol as the first things...

when you say air box what could be wrong with that? and how do i check that its working? To be honest I dont know what the hell the air box does, im guessing it regulates the air flow into the engine....

I have had the side fairing off for a quick look but didnt really do anything as my knowledge of bikes is very limited

When you say plugs you mean spark plug? I wouldnt think the bike would start if the spark plug had stopped working, correct me if im wrong.

[Ropehead]

If the powervale was shut it would effect the performance above 7500rpm but it woudnt make it cut out or stop it running!
could be a timing problem!



I JUST HOPE THIS IS NOT THE REASON IT WAS FOR SALE !!!!!!!!!!!!

[M1ke]

[McJamweasel]

You could have a tatered plug. First thing to try would be replacing that.
If they get fouled then the bike will still run, just not very well so it could be the problem. Doesnt sound quite right tho.
____________________
BCF: Be yourself, just don't be an arse.

[Ropehead]

BODGE IT!

[M1ke]

maybe keith will know

This is annoying, i dont suppose the guy i bought the bike off will have it back now. Maybe it is only a minnor fault. The thing that made me think that its the power valve is that it keeps f*cking up just at the point were it opens/shuts.

I will take it down to the garage on tuesday or something but it better not be anything big or i'll be really pissed off.

I will take it out tomorrow if i have chance to see if it has corrected its self as I was stopping, starting alot today (i am getting used to the gears in other words) In the past week it has been redlined a few times as im new to the whole idea of gears and i have stalled it rather alot when pulling away. Im hoping i havent caused this problem.

[bikerboy1]

did you turn the petrol switch on!! because today i turned it off and i forgot and went home got to the end of girls street and it cut out and then i remember that i need to switch it on!! and then away i went!!!!!!!!!!!!!!!
so check the switch!!!!!!

[M1ke]

i never turn it off mate thanks for the help though i wish it were that simple

[TiN]

The spark plugs could get coked (covered in "soot") as a resulted of either a) too much choke, b) running too lean, c) blocked airbox, d) etc...

...take your plug out and take a look at it...if it's coated in black, then it's coked up (or oiled, if it's oily)...you can give the air filter a little clean with a can of compressed air (as a quick fix)

Keith can probably suggest for reasons though...

Tin

[Hunter]

Hey newbie..!

Better get it checked by a pro mate... sounds to me like the carb just needs a bit of cleaning.

Usually after you buy a bike.. you have to check and clean these things cause you never know how the earlier guy used it and maybe it was just sitting in a garage for sometime, if it was then its quite likely that the foam in the airbox was a clogged and may have deteriorated over time.

Its unlikely that its the CDI or electics, but could be.. get those checked as well.

Its not a stuck powervalve thats for sure.

bikes, even aprilias , can take quite a beating! So I don't think its cause you stalled it a couple of times or the fact taht you redlined it.

[Keen]

I think you should start turning the fuel tap off after use- leaving it on causes damage I think, especially on 2 strokes.

My Cagiva does the same thing- only its less selective about when it does it. It runs for 10 minutes then does that. Italian bikes are shite

[Robby]

after a little thought on the matter, i have a few ideas:

1. blocked fuel line. something is sitting in your fuel line (the line from the tank to the carb) and resticting the amount of fuel getting to the engine - this would also explain why it starts ok, because fuel can slowly filter past the object. just take off the line and slide a fat bit or wire down it if you cann see anything down it.

2. blocked carb. you need to get an expert to fix this for you, but basically just a bit of crap sitting in a jet.

3. water in the carb. again you need an expert to check it, but if water could have got into your tank at any point it could be sitting in the bottom of the carb.

failing any of this, make sure you turn off the fuel tap when your not using it, if it is a blocked carb then you get some crap under the needle holding it open or making it stick, and your bike pisses petrol all over your back wheel.

[Scooby]

I had the same problem. When you start the bike, does it chuck out a load of smoke??? If not it might be the same problem I had.... the oil pipe has worked its way off your carb... another way to check is, rev the bike lightly and put your hand at the end of the exhaust and let it blow on your hand, does it smell petrolly??? If so this also suggests lack of oil....
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A big enough hammer fixes anything!

[Keen]

mine is pretty smokey. I stripped it down on friday night and checked the breather and the fuel line (from the tap to the tank) and its ok. But I noticed that there are what look like overflows and breather pipes everywhere so I thought one of them might actually be loose from somewhere. But I couldn't see the carb properly to see if it looked like a pipe was missing (it was late and dark) and I haven't looked since. I think I'll have a good look at it first thing in the morning. Thanks for the advice scooby.

[Kickstart]

Hi

It is a fair chance that it just needs a new spark plug. As you have only just got it and are getting used to a geared bike and have stalled it quite a few times there is a fair chance that the plug has coked up. By the way, my RS125 virtually never needs choke to start even from cold.

Otherwise, yes it could be a blocked breather hose into the tank or a blocked fuel pipe, or a blocked jet. The breather hose being blocked will stop air getting into the tank and so fuel cannot get out. Blocked fuel pipe will just stop the fuel getting to the carb (check the filter under the banjo shaped cover on the side of the carb). Blocked jet would be a bit of a pain, but probably not that likely.

Also, how old is the fuel? If the bike has been standing for a month or 2 the fuel could have started to go off. Never had a problem myslef over such a short time, but I know of mechanics who say they drain all the fuel out of bikes in the showroom otherwise they have problems within a month

All the best

Keith

[Hunter]

Keen.. the carb you have should have 3 breather lines coming out of going apparently nowhere

The oil and the petrol lines to the carb are the only ones that should be attached on the other end.

I think I have a picture...

This one shows the carb with ONLY breather lines attached.. yes it is dirty and i've cleaned it up since

https://www.technolanka.net/finnpack/nsr/DSCF0083a.JPG

and these are all the carb bits.. in case you want to take your carb apart

https://www.technolanka.net/finnpack/nsr/DSCF0121a.JPG

[Keen]

I still haven't got around to looking at it- but thats good to know cos there's two tubes coming out of the top that both go nowhere- I don't know alot about carbs but I thought that was too many before now

In fact I'm gonna go have a look at it now The weather's fantastic and I cant ride my bike

[M1ke]

Well... I seem to have fixed the problem

When i said i had checked the fuel i meant I had opened the tank and given it a shake and i could see loads of fuel in there... However I filled it up and it works again...

Is the reserve petrol in the same tank or something? cause i swear i could see loads of fuel sloshing around!

Thanks for all your help

Regards,
newbie

[McJamweasel]

The fule tap will have three settings on it. On, Off and RES. RES is reserve. It is the same tank but you need to turn the fuel tap to reserve or it wont work.
____________________
BCF: Be yourself, just don't be an arse.

[TiN]

The reserve facility simply uses a shorter tube, so it can suck in fuel that is lower down in the tank...you can run on reserve constantly for normal riding, but it's not advisable, as when you run out of petrol, you run out!

Tin
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TiN
dotgems.net

[TJ NSR]

glad u got ur bike sorted mate... mine was feeling a little rough yestaday and today so i cleaned the airfilter and plug and the carb and it good now, nice a smooth


thanks dad for the help mate

[Robby]

also on older bikes (like mine) the bottom of the tank is where the rust sits, so the reserve tap just lets the rust down and clogs my inline filter.