Aprilia rs 125 problems

[Gordy85]

Just recently put a new engine in my Aprilia rs 125, had it fired up and running, until recently everything seemed fine, we finished putting the rest of the bike back together.

We got to the exahust, put the back pipe on, and for some reason since we've done this, we can't get the engine to start at all.

We have cleaned the carb out fully to make sure it wasn't blocked (Was sitting for 6 months doing nothing).

Changed the coil over as the old 1 wasn't giving a spark, so I now have a spark.

We have tried everything we can possibly think of, but we still can't get it to start.

I have been told by a garage to try quickstart, but my dad is really iffy about using this, as he said engines tend to rely on it once you've used it the first time.

Any help would be appreciated, and thank you ina advance.

[bmwsport]

Have you taken the exhaust back off to see if it runs?
So you have spark, do you have fuel in the float bowl of the carb? I'm guessing its spinning over normally, you have compression?

[Gordy85]

Everything else seems fine, compression seems ok, taken the exahust back box off, but haven't taken the whole exahust, haven't checked if fuel to see if there is fuel in the float bowl, as we've only just put the carb back onto the bike.

What would be causing the fuel not to be getting into the float bowl?

[Philious]

[Gordy85]

I did think there wasn't enough fuel coming out of the tank to be honest, when I turn the fuel on, hardly anything comes out the line, and usually when you turn it on the fuel comes flowing out, so maybe I'll have a look at that tomorrow.

When we cleaned out the carb, there was a lot of petrol in it, but it wouldn't start.

Maybe I should just garage it.

[bmwsport]

ok bud, when you stripped the carb was the inlet manifold wet? does fel appear to be getting into the cylinder?

As for the tap, it shouldnt poor out, it is quite slow, but certainly doesn't trickle either.

If the last time it ran it had no exhaust at all i'd go back to that step and retry, does it sound like it has compression when turning over?

[Gordy85]

Everything on the carb was wet, but the carb itself was pretty dirty inside, so we cleaned everything out to the best we could.

Sorry, I don't understand the second question, Fel?

We have tried taking the exahust off again since, and with no luck, it still doesn't start. :/

[d-bug]

have you took the spark plug out an put a tiny bit of petrol in the top and tried to fire it up that way ?


d-bug
____________________
cagiva mito mk 2 , cagiva mito evo 7 speed

[Gordy85]

We haven't, no, I assume that does the same kind of thing easy start does?

[Philious]

[Gordy85]

Will be trying that out tonight, see if it works or not, we also have easy start to try out, just incase.

I have been informed that if it doesn't start with easy start I need to take it to a garage, I would prefer to do this anyway.

[Gordy85]

Just tried to start the engine putting petrol on the spark plug, no go, so we decided to use easy start...it started, then cut out as soon as it started, so we're led to believe the carb it blocked somewhere we couldn't find, or the petrol tank is blocked.

How long does it take for petrol to go stale?

[Im-a-Ridah]

Definately use a fresh tank of fuel after cleaning out the carbs and tank.

[Gordy85]

Yeah, we're going to empty it, going to take my spare tank and clean it out, then destory the old petrol and wash out that tank too before we start again.

So far this is my 4th engine for this bike, I got screwed on 1 engine I brought off ebay, the guy sent me an engine that was fked.

[Gordy85]

I feel like such an idiot, we got the bike running today and it was running perfectly while we were bleeding the water.

The problem was water was sitting in the bottom of the petrol tank, so instead of it sucking petrol through it was sucking water (I blame my dad, he was always trying to start the bike on reserve tank, thus sucking the water through)

So all is well, for now haha

[Fnatic]

Nice one.

My RS wouldn't start randomnly yesterday so I changed the fuel in the tank, cleaned and re-oiled the filter and cleaned the carb out.

Fired up first time, weird.

[Gordy85]

Just when I thought all was well, the bike now won't change gears when sitting, it's like it's stuck in neutral, won't even knock down into first, I'm really concerned about taking the side of the engine off again, as we just brought a new gasket and we've used 2 bottles of gearbox oil so far, as when we recieved the engine, it was in 4th gear for some weird reason.

Is there any way you can check the gears without opening up the engine and moving all the gears to check if everything is working?

[Gordy85]

Well, we have got the bike changing gears now.

I'll post some pics of the bike soon, my dad has done a new paint job on it, and it's looking really nice.

[d-bug]

i had water in my carb an tank over the last 2 days with my mito , funny maybe a thing with these little wonna b race bikes lol

cheers d-bug
____________________
cagiva mito mk 2 , cagiva mito evo 7 speed

[Gordy85]

Pics of the bike with everything on bar the side fairings, I'll get 1 of them when my dad finishes spraying them.

Can you guess my name?!

https://i27.photobucket.com/albums/c194/Hwang01/Newkill003.jpg

Full shot from behind.

https://i27.photobucket.com/albums/c194/Hwang01/Newkill004.jpg

[Gordy85]

Have found what I think is another problem, but my dad doesn't seem to think so.

The engine seems to rattle a lot, and there seems to be some kind of low grinding noise coming from the engine, I'm pretty sure we've done everything right, so any ideas what it could be?

Just sitting idle within 5 minutes the temp is going upto 80+, my old engine would sit at 65 until you ride it.

Just took the bike for a ride up and down my road, it stalled 4 times and would only start with the choke on, would this be caused by the mix of petrol/oil being off?

After starting the bike for the 4th time, I got it to keep running, but it seemed to pull away like the engine was still cold, but the radiator was boiling hot, and the water temp was sitting at 72, I got a little worried about this

[tshort2007]

have you bled the air out the cooling system?

[Gordy85]

We did, but I believe we didn't do it enough, just started it a minute ago, the bike was still making a really weird engine noise (Could be because of not getting enough cool water?)

The head was hot, but some of the pipes were cold, and the water in the chamber above the head was cold too, which doesn't make sense, as the radiator was hot as well as the head.

[tshort2007]

check the thermotat. drop it in boling water, and check it opens.

[Gordy85]

Yeah, we're gunna do that tomorrow, and hopefully my mechanic friend is gunna come round and have a look at it too.