RS125 Help

singo · 29-09-2008, 03:46 PM

Went for a ride today got caught in holiday traffic and after this my bike started spluttering and wouldn't rev properly and I had to crawl home. First thing I thought was spark plug, which yes was oily ,so I cleaned it put it back bike started first time. I went for another ride hit the back roads opened it up thinking the crawling pace that morning was the cause but after 5 to 10 minutes it had over oiled again. I was just wondering what you guys thoughts are before I ring the shop. I am going to replace spark plug tomorow but I don't think thats the problem.
CHEERS

Andy_Robbo · 01-10-2008, 08:34 PM

hey man, i have just recently bought a rs125 and the same thing has happened to me also. i had rung rick gill where i bought the bike from and he told me that is was the same reason and i just gotta ride the bike harder. He also mentioned to put some spitfire petrol cleaner into your tank every couple of fills, smaller amounts of course.

Since i have done this the bike has run awesomely. 750k's on the clock now and riding beautifully.

hope this helps.

ozzypatrol · 02-10-2008, 06:04 AM

could be something to do with idling along, from what i have been told you can't just sit in traffic and let it idle. You have to blip the throttle every couple of seconds otherwise oil pours into something somewhere and makes it go like shit. even cruzing slowly (car park) i got told to slip the clutch now and then and give it a rev.

ritza350 · 02-10-2008, 06:11 AM

if the traffic is moving slow, cog it back a gear or two and ride slowly revving high, make the motor do what its sposed to ...rev

singo · 03-10-2008, 02:50 PM

yeah thought as much but even after cleaning plug and taking it for a good wrap it overoiled again. Its still under warranty so cant hurt to get them to look at it

Andy_Robbo · 03-10-2008, 05:14 PM

how many k's have you done on it so far? cause my first 250k's were hell too...i thought why the hell did i get one lol but after it got worn in more i gradually fell in love again.

Mattis · 03-10-2008, 05:28 PM

Could be the oil pump is adjusted too rich perhaps.

Yes, two strokes do need to be ridden reasonably hard to give them a good "clean out" but if the oil is mixing too rich then it will foul plugs easily enough.

It could be that the pump is adjusted rich when the bike is sold new and then leaned out a bit when it comes in for it's first service. This could be done to ensure it doesn't seize during those first crucial few thousand kms.

ritza350 · 03-10-2008, 06:30 PM

^^^ wat he said

Stratos · 03-10-2008, 09:30 PM

Ditto. My PV jammed because the pump was running too rich. And try keep them up around 7000rpm when crusing. It may sound high, but she will run cleaner and be ready to go quicker if you need be.

Desmogod · 03-10-2008, 09:51 PM

Quote:

Originally Posted by Andy_Robbo

hHe also mentioned to put some spitfire petrol cleaner into your tank every couple of fills, smaller amounts of course.

Honestly, I wouldn't bother with this bit of advice, these bikes are built to be ridden hard, they aren't commuters. They need constant maintenance and cleaning like all 2 strokes, these things are what are needed, not some off the shelf remedy.
Thinking about it, the oil is injected after the carburetion anyway, so it wouldn't gunk up the carby jets either, so that piece of advice is utter bollocks.
Look, ride it hard, rev it hard and I guarantee you won't have oiled plugs, tachometers have a redline for a reason, get close to it.

Stratos · 03-10-2008, 10:16 PM

The oil is actually fed into the side of the carburettor on the 125's Jim. However, i cant see how it would block unless it was burned. The only thing i have ever ever seen block a the ports in a jet are the tiny tiny bits of shit from our crappy fuel that gets past the filters.

Literally these bikes are a 125 race bike with lights and a license plate whacked on it, and some shitty Euro 2 controls (post 2005).

Ride the cunt hard, she wants to be thrashed. They loosen up, the feel "free'er" after a good hard run. (freudian)

These things max out at 165kph. Try it tomorrow n get back to me.

I would have a look at your oil pump calibration though. How many K's you done on it? I can show you a few lil things to give it just a tad more whack in the mid range.

thro · 04-10-2008, 02:41 AM

^^ whs.

by "ride hard" you don't necessarily need to break the law... but give it a good squirt in first/second gear as often as possible (eg, every set of lights, to redline or close to) and it should be fine.

singo · 06-10-2008, 04:37 PM

well i got a new plug the old one was well past cleaning and have been giving it a good thrash no problems thus far. I have done over 2000kms so she pretty worn in. I did end up with a seized piston just after first service which was weird maybe they upped the oil when they fixed it. Ill jus keep givin it too it and see what happens so far so good.

druu · 06-10-2008, 06:01 PM

Seized piston after the first service?!

rgvlee · 07-10-2008, 07:36 AM

lol, what did you do... hammer it from cold?

singo · 08-10-2008, 03:05 PM

nah Im a a newb to bikes but Im not new to engines. Always wait till its warmed before giving it the get go. I was on way home from work heading to petrol station doin bout 60ks when the back wheel locked up. The shop never actually said what caused it but I know they had trouble with aprillia trying to claim parts and work on warrany.
Also wondering what plug should be used. The one in the bike at the time was a NGKR irridium race plug these are meant for higher temps aren't they? as in full fledged racing where the motor is really hot all the time.

rgvlee · 08-10-2008, 03:10 PM

the number on the plug is the key to the heat rating

Stratos · 08-10-2008, 04:22 PM

I used a NGK BR9XIE, the iridium ones. Would get a new one every 6000km or so.

And mate, I'd love to hear what caused the piston to seize. Thats pretty crazy after only 2000km.

singo · 09-10-2008, 06:46 PM

I would also love to know... never know could be a lemon. (I hope not)
The race plug is a BR10EG while the other plug is a BR10EIX so the heat rating is the same I take it for both plugs? Does the heat rating go up along with number? Can anyone tell me what the difference is between them obviously the tip on the race plug is thicker. Does this just mean a more reliable spark?

Stratos · 09-10-2008, 08:28 PM

Yes, the higher the number the cooler the plug.

The iridiums produce a more 'powerful' spark due to the better conducting materials requiring physically smaller exposed conductive areas. Performance increase is negligible, but i found more response from the bike after fitting one. These plugs also pose more reliability with cleaner burns.

I traded off with the 9 being between the 8 & 10 as i didn't see myself keeping it WOT (wide open throttle) 100% of the time as i often used it to commute to work.

It performed beautifully country run or commuting. These little weapons are temperamental. Keeping a close eye on how they are running is a must!

I gather as your a noob you dont know about the CDI and RAVE mods yeah? CDI is your ignition control unit, and the RAVE controlls the actuator for tour power valve.

Your spark plug is one of the major keys in telling your how 'healthy' your bike is. Kinda like a doctor shoving a thermo up ur sphincter. Oh and btw, keeping a close eye on the cleanliness of the PV is a must! And keeping the oil pump in check too! At least every 6000km! Dump your gearbox oil every 6000km too. I rode mine fairly hard off the line, slipping the cluch ALOT so the oil dirties quite quick.

Let me look at your bike, ill make her run sweet. I miss my RS.