ARGH! what has gone wrong with my rs125?

[superslick]

Hi guys

Right, last Monday i bought an aprilia rs125 gp-1 2004 from my local dealer and iv warmed it up every single day and have finally had time to get out on it today, so..

i warmed it up to around 60', set off slowly, went down a steep hill keeping in a high gear, came to the bottom of the hill and started driving up another steep hill, changed down a gear and was on my way up the hill when the bike cut out, cut in, then died. i pulled over and tried numerous times to start it again on the electric start and no luck, on about the 3rd attempt it backfired. I let it sit for about 3 mins then pushed it down the hill and tried to bump it and it seemed to be compressing properly but it just wouldn't start at all.

So, pushed it home, took the spark plug out and it was wet so i dried it off, checked for spark (strong spark) put it back in and tried to start it but after numerous attempts it would not start and now has a flat battery.

I though it could have blown a hole in the piston but it does sound to be compressing and there is no blowing when trying to start it, and it only backfired the once.

Does anyone know what might be wrong with it?? it had an engine rebuild around 320 miles ago and has always started up fine. Its not the end of the world as i have another bike to get around and the RS is still covered under the used bikes warranty but its so damn annoying!

And yes i have checked the fuel is switched on etc! lol

Thanks, Jon
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aprillia rs125 gp-1 2004

[benjami]

Is there enough fuel in the tank to be getting through on 'on'?

Also, are you running it in still?

Carb ok?

[5v3d3b0]

Wet sparkplug doesn't sound right...
https://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html

[superslick]

Nearly a full tank of fuel in. Done approx 320 miles since the rebuild and as the dealers mechanic told me, it is run in.
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aprillia rs125 gp-1 2004

[benjami]

Mechanic is talking out of his arse so it seems.

According to my manual - 500 miles of below 6,000 rpm riding.
Followed by a further 200 miles of under 9,000 rpm riding.

[5v3d3b0]

If it had a bottom end rebuild the running in is up to 1000 miles under 9000 RPM...
I believe it is :Vary throttle for 100 miles. Then under 6000 RPM for 500 miles, varying throttle. Then under 9000 RPM until 1000 miles, and from there on never exceed 11000 RPM
Tonight when I get home I can give the exact quote from my Haynes manual

[superslick]

Right, typed below is the full list of parts on the receipt for the work done.

CHECK - START PISTON SOUNDS NOISY, BATTERY FLAT. CHECK KILL SWITCH + GET RUNNING

APRILIA OIL SEAL
APRILIA OIL SEAL
NSK BEARING 6005
NSK BEARING 6302
OIL SEAL 22 X 12 X 7
APRILIA NUT RS125
APRILIA RS125 GASKET 122 ENGINE
NSK BEARING 6206
APRILIA 125 P/KIT
CON ROD KIT RS125 ROTAX BIG END KIT
APRILIA RS125 GASKET-CLUTCH
APRILIA RX/RS 125 PLATE - CLUTCH
APRILIA RX/RS 125 SCREW, ADJU
NUT (1KT) APRILIA 8120531

PARTS - £232.37

LABOUR - £150

carried out at raceways in Fleetwood.
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aprillia rs125 gp-1 2004

[Timmeh]

What colour is the sparkplug?
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GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[superslick]

dark brown
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aprillia rs125 gp-1 2004

[Timmeh]

hmm. dark brown is an ok colour. Had it been white or glazed I'd have gone for a fuelling problem.

Another compression check and then a top-end inspection is on the cards.
____________________
GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[superslick]

Going to send it back to the dealer this week to get it fixed under warranty.

Hopefully get them to pick it up tomorrow, or sometime soon.

Although, if it had a hole in the piston or really bad compression would it not backfire every time the piston got to top dead center on the first stroke?
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aprillia rs125 gp-1 2004

[stirlinggaz]

Hi,
dont want to sound stoopid,
but have you tried a new plug?
i know you said you were getting a good spark, but i had this same problem, with a NGKbr10 plug.
plug was wet.
held it against frame & was getting a blue spark.
but when i cleaned it up & put it back in, bike wouldnt start.
bought a couple of new plugs, br8,br9 & br10.
tried the br9 first, bike started first time.
so i kept it in, till i changed the carb.
now using br10 iridium & never had a problem since.
i now treat plugs as disposable items!
cheers,
GAZ

[superslick]

i took the br9es out the dirt bike and tried that but had no luck.
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aprillia rs125 gp-1 2004

[superslick]

a friend of mine has an rs125 and exactly the same happened to his (bogged down, cut out, backfired, wouldnt start) and changing the plug fixed his but iv tried it with mine and bumped it down the road numerous times but to no success
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aprillia rs125 gp-1 2004

[stirlinggaz]

hi,
when mine wont start, here the routine i follow :
makes sures thers plenty of petrol in,
battery FULLY charged,anything under 12v & i charge it up.(doesnt like getting bumped, or im not doing it right?)
stick tap on reserve, (common problem for filter to block in on position)
fit new plug,
give it a couple of presses on starter,
if it doesnt start after 3 or 4 attempts,
use the choke for a few seconds, but always starts before i get to use choke, unless its really cold outside.
if youve done all that, & it wont start, id be taking it to the bike doctor,
cheers,
GAZ

[L3G3ND_MTX]

To be honest with you, if you have taken a spark plug out of your dirt bike they might be completely diffrent plugs to your RS they all have diffrent temp 2 run at etc. (correct me if im wrong) thats why you have to have the exact plug for your bike maby this is an issue?

Just a thaught.

[tutton]

Thats a good question ^^ he poses.
why do you have br9 plugs for a rs125 engine on your dirtbike?
unless you have a rs lump on it?
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Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[superslick]

well, the dirt bike iv got is a 2006 aprilia rx50r. Uses the exact same spark plug (br9..) as my friend used to get his rs125 working.

Anyhow the bike was collected by the dealer today from my house and hopefully should be diagnosed. up and running before long.




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aprillia rs125 gp-1 2004

[liam7388]

[liam7388]

Also won't go above 6000 rpm unless I keep bliping the clutch, was in power band its ok. Any help plz

[Damon]

[liam7388]

What you onna bout? What colour is it?

[tutton]

Lol hes fucking with you,
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Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[veeeffarr]

[Keir]