Aprillia rs 125 wont start.. ITS WELL DEAD!!

[Pol Anorl]

We have fuel in the bowl even to the point of adjusting the float so it comes out the overflow on the carb.

Jets are all clean and see through no grit or dirt in carbs.

Sparking fine, purple strong spark.

Slightly wet spark plug.

Poured fuel into cylinder with piston fairly high and tried the starter but nothing.

When pushing the starter it chugs away and gives a good bit of pressure from the airbox so its sucking through ok.

Plenty of compression, piston looks brand new not a single drop of carbon on it.

starter motor does turn, apparently when the guy put fuel into the cylinder there was a big bang and shot some baffles out the exhaust so it will fire but 2 hours today i couldn't get a single pop.


Now.. the flatslide carb has been played with by someone else.. mixture screw was about 50000 turns out and idle had been messed with..

Mixture all the way in and 2.5 turns out and idle screw all the way in and about 4 turns out.


Update: Got it all running was okay bit of a knock... left the guy with it said id be back in 3 days when hes off work to check it all out...

Phone call that night "i think its siezed"

spoke to him today he said he got it started and was playing with throttle and it reved really high and wouldnt stop revving then just stopped...

This will be why!

Bottom end bearings are fucked, looks like part of one there.

https://i.imgur.com/wp8nC7d.jpg
____________________
GOOD GAME BODYGUARD: https://i.imgur.com/8WePGgf.jpg
20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[Just_James]

Do you know if it has ever run with the flatslide carb on it?

With the mixture screw so far out am just wondering if someone has chucked it on and never got it jetted right / got it to run?
____________________
Current Bikes / Projects: 1999 Rieju RS1 50
Previous bikes - 1986 DT125R (field bike), 1989 KX250, 1980 KX420 (with 500cc big bore), 1992 YZ250, 1988 KX500, 1989 XR250R, 1988 VFR400R NC24, 1999 Cagiva Mito 125, 2008 Rieju RS2 50 , 1993 Honda NSR 125

[Pol Anorl]

im sure the flatslides are standard on the 2001 rs125, the guy said he has played about with the screws trying to get it to run.

Thing thats odd is even with fuel direct to cylinder it doesnt start even though it does spark.

fresh fuel and ignites with a lighter.
____________________
GOOD GAME BODYGUARD: https://i.imgur.com/8WePGgf.jpg
20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[bypass2]

Exhaust maybe blocked /Full of petrol.

[stirlinggaz]

Hi,
What year is it?
reason im asking? most rs's came with dellorto 28mm ROUND slide carb.
1996-98 came with 34mm vhsb & this may well be a flatslide ...but every other year since then was the bog standard phbh 28mm. (which I hate with a passion because they are so fickle) unless a previous owner has upgraded? (well worth doing imho)
Do you know what model of carb do you have?

cheers,
GAZ

[Pol Anorl]

its a 2001 carb is delorotto vhsb 34ld

friend suggested it could be a timing issue which is why it wont fire with fuel direct to cylinder.
____________________
GOOD GAME BODYGUARD: https://i.imgur.com/8WePGgf.jpg
20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[Kickstart]

Hi

That isn't a standard carb for that bike.

With the idle speed screw I would screw it most of the way out, and just use the throttle until you get it started.

Is the timing correct? Is it still giving a spark when the plug is in place (had this once with an RS - plug out it cranked rapidly and spark, plug in it cranked more slowly and didn't spark - the gap to the ignition pickup with too big).

Is there reasonable compression?

All the best

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

[Just_James]

Isn't the timing fixed at the cdi? Didn't think they were mechanically adjustable?

What happens with a bump start? Anything?

Checked for air leaks? Is the exhaust / can blocked?
____________________
Current Bikes / Projects: 1999 Rieju RS1 50
Previous bikes - 1986 DT125R (field bike), 1989 KX250, 1980 KX420 (with 500cc big bore), 1992 YZ250, 1988 KX500, 1989 XR250R, 1988 VFR400R NC24, 1999 Cagiva Mito 125, 2008 Rieju RS2 50 , 1993 Honda NSR 125

[Kickstart]

Hi

In theory it is fixed. In practice it can be adjusted by changing the cdi, or by using an offset woodruff key. However what can happen is the woodruff key shears off and the timing goes miles out. Not heard of this happening with the RS but it wouldn't surprise me if it does (especially given that the starter motor operates on the flywheel).

All the best

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

[Pol Anorl]

yes i couldn't hold my thumb on the spark plug hole no matter how hard i pressed down on it.

how would i go about checking the timing on it?

timing is all i can think of, its chucking the fuel out before it gets a chance to spark?
____________________
GOOD GAME BODYGUARD: https://i.imgur.com/8WePGgf.jpg
20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[Kickstart]

Hi

Inductive timing light is probably the best thing to check it.

All the best

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

[Just_James]

[Pol Anorl]

Neither do i lol.. helppp
____________________
GOOD GAME BODYGUARD: https://i.imgur.com/8WePGgf.jpg
20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[Kickstart]

Hi

Just a strobe light that is triggered by a pickup that clips around the HT lead.

All the best

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

[Pol Anorl]

I feel so thick
____________________
GOOD GAME BODYGUARD: https://i.imgur.com/8WePGgf.jpg
20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[Pol Anorl]

I feel so thick
____________________
GOOD GAME BODYGUARD: https://i.imgur.com/8WePGgf.jpg
20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[Just_James]

[Pol Anorl]

online says about taking stuff off and rotating stuff ...

hard to look without the bike here to hand so will get on it tomorrow.
____________________
GOOD GAME BODYGUARD: https://i.imgur.com/8WePGgf.jpg
20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[Kickstart]

Hi

The older 123 engines used an SEM ignition system. On this you had to set the timing up statically, removing the flywheel to move the stator on its mounts (had slotted mounts).

The later 122 engined bikes (like this one) have a totally different ignition system which are far simpler but not designed to be adjusted (hence normally swapping the cdi to change the timing).

All the best

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

[Pol Anorl]

ok ill check the engine, how can i tell which engine is which
____________________
GOOD GAME BODYGUARD: https://i.imgur.com/8WePGgf.jpg
20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[Kickstart]

Hi

Easiest way is to look at the coil. Blue coil = SEM ignition = 123 engine. Black coil = Nippon Denso ignition (or someone has bodged on the ignition from the older 127 engine) = 122 engine.

The 122 engine should have it marked on the crank cases on the clutch side.

With a 2001 bike it should certainly be a 122 engine.

All the best

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

[Pol Anorl]

coil is black so its 123
____________________
GOOD GAME BODYGUARD: https://i.imgur.com/8WePGgf.jpg
20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[P.addy]

[STONEY!]

had a bit of experience with these, a few things to try:

get a brand new spark plug (and I mean brand new, if it has got wet even once you can pretty much forget it)

try a short reach plug out of a strimmer/mower etc, if it is flooded to fuck (which it probably is) the plug wont get as wet and may just fire it into life (had great success with this on many bikes including paddy's old gp lol)

Check the reed valves very carefully, slightest bit of damage to them and it wont go.

[Pol Anorl]