Lach Australia

Fairfield, Australia

#22 Oct 28, 2007
Can someone please advize me <i have 07 250F,I am about to replace big end bearings for the second time,this time after only 20 hours.I replace the oil every five hours In the manner suggested in the manual as I have done since new with Silkolene Pro plus 40 oil and although the bike is raced on a club level it is not abused nor over reved,does anyone else have similar stories and or suggestions?
BILL

Dayton, OH

#23 Nov 3, 2007
bobby wrote:
who knows the oil gas mixture ratio for a ktm 125 sx
50 TO 1 WILL WORK
RGeth

UK

#24 Nov 4, 2007
Hi Jon,
Ive ran the bike for about 10 hours and the gears arent slipping but im pretty shure im losing coolant into the gearbox when I did my after ride checks (because of the colour of the gerbox oil and rad water level).
Have I done any damage by runing it? What can you recomend for flushing my gearbox out (or cleaning it?) so I can get the seal fixed?
Many Thanks,
Geth
Jon Wright

Harlow, UK

#25 Nov 14, 2007
RGeth wrote:
Hi Jon,
Ive ran the bike for about 10 hours and the gears arent slipping but im pretty shure im losing coolant into the gearbox when I did my after ride checks (because of the colour of the gerbox oil and rad water level).
Have I done any damage by runing it? What can you recomend for flushing my gearbox out (or cleaning it?) so I can get the seal fixed?
Many Thanks,
Geth
Hi man,
Should be ok - If you were racing above club level, I'd strip it and replace all the bearings all the seals and probably the clutch plates too(££!), but if its a practice bike / fun bike, I'd just drain the old oil VERY well, replace the water pump seal then change the gearbox oil after every ride until it comes out looking like it did when it went in - eventually it will collect all the last bits of coolantand sort itself out.
Cheers,
Jon
Tom Good

Saint Bonaventure, NY

#26 Nov 19, 2007
I own a 2004 125sx, and I know completely how to change the oil, but I cannot find the place where you check the oil level. The bikes mechanic told me that there is a screw i take out, and i should fill the bike until oil comes out that hole, the only problem is that i cant find it.
Da Kine

Kissimmee, FL

#27 Nov 24, 2007
no comparison. Apples to oranges.
125 for beginners.
If you have to ask, you're a beginner-and that's ok. Be true to yourself and lessen the chances of getting hurt.
Da Kine

Kissimmee, FL

#28 Nov 24, 2007
Depends on your altitude.
I agree generally with 50/1
Get a 'ratio rite'
AY
RGeth

UK

#29 Jan 4, 2008
Tom Good wrote:
I own a 2004 125sx, and I know completely how to change the oil, but I cannot find the place where you check the oil level. The bikes mechanic told me that there is a screw i take out, and i should fill the bike until oil comes out that hole, the only problem is that i cant find it.
Hi bud!
Try to look(looking at a side view of the bike) behind the spring of your rear brake, if theres two bolts behind the spring its the one on top!
Keep the bike on a flat surface and the oil should drip out, after doing this put a little more in.
If this hasnt helped go on the KTM website and download the 06 owners manual (the engine hasnt changed mutch fron 04)
moo

Columbia, SC

#30 Feb 5, 2008
ben

Manchester, UK

#31 Feb 20, 2008
I have a 98 ktm exc 250, which is burning gearbox oil and is pouring it out of the exhaust in a big way, i have changed the piston, rings, little end bearing, crank seals, water pump seal and all engine and head gaskets and it is still doing it. starts on first kick buts sounds abit clunky aswel as pouring gearbox oil out of the front of the cylinder into the exhaust and onto the floor. please help!! could it be the main bearings?? cant think of anything else it could be?
Jon Wright

Harlow, UK

#32 Mar 4, 2008
ben wrote:
I have a 98 ktm exc 250, which is burning gearbox oil and is pouring it out of the exhaust in a big way, i have changed the piston, rings, little end bearing, crank seals, water pump seal and all engine and head gaskets and it is still doing it. starts on first kick buts sounds abit clunky aswel as pouring gearbox oil out of the front of the cylinder into the exhaust and onto the floor. please help!! could it be the main bearings?? cant think of anything else it could be?
Hi Man - Before going on - Are you 100% sure its gearbox oil? If its losing so much, the gearbox will be very low or empty - check this. If its not it could just be 2 stroke oil - are you adding a lot, using cheaper oil, or doing a lot of slow woods type riding, as it will build up in the bottom of the crankcase then get flung out when you rev it hard. How about putting an EP type oil in the gearbox and riding it. If the oil coming out of the engine then smells disgusting, its definitely the gearbox oil.
Ok - so if it IS the gear oil, something maybe pressurising the 'box to push the oil into the crankcase - is the breather blocked? Or could the crankcase seal be bust where it joins the gearbox, so it is running in when the bike is stood? Other than that, if you did not get the crank seals exactly square in the cases, or if the old seals have worn a groove into the spacers, that would cause a leak.
Hope these thoughts help. Good luck
jon Wright
Dylan

Perth, Australia

#33 Apr 13, 2008
how do you check the oil on KTM 125sx i cant find it and someone said that you need to unscrew sum stuff
Wes

Yorktown Heights, NY

#34 Apr 15, 2008
I just bought a 2004 KTM SX250 and rode 3 times on MX practice tracks. Is it just me or are KTM's tempermental? I have to work harder to keep it right.

It is way too torquey (powerful at low end)
Wes

Yorktown Heights, NY

#35 Apr 15, 2008
Dylan wrote:
how do you check the oil on KTM 125sx i cant find it and someone said that you need to unscrew sum stuff
On my SX 250 there is a screw/bolt on the crank case on the kickstarter side. I think it is 6 or 8 mm. If you google KTM parts and look at the crank case parts for your particular bike you can probably find the parts breakdown to get you what you need.
Gethin

Northwich, UK

#36 Apr 16, 2008
Dylan wrote:
how do you check the oil on KTM 125sx i cant find it and someone said that you need to unscrew sum stuff
Hi mate your best bet is to go on the KTM website and download a FREE! manual owners for your bike! it tells you there
kane yandell

Sunderland, UK

#37 Apr 17, 2008
hey im kane i just wonderd what the correct oil mix is for my sx 250 02 model, because it kept oiling the plug up. but i have had it serviced and tuned in a garage now so it should be ok !:D

but just for some reasurance could som1 let me no

cheers
fat girl

Perth, Australia

#38 Apr 27, 2008
Nicole wrote:
Does anyone know how or where I can get a KTM 125 2 stroke GP road racing bike?
yeah my place, but you have to come with clithes i can get off easily
RGeth

UK

#39 May 29, 2008
Hi, Iíve been out on my bike in on a sand track and Iím in the process of cleaning it. How do I get to the wheel bearings off? They seem to be a complete sealed unit!
Whatís the best way to clean your chain from sand? Iíve tried soaking it in diesel and it wont come out!
steve

Novosibirsk, Russia

#40 Jun 20, 2008
does anybody no fuel to oil ratio on ktm 200exc.year 2002 .cheers
jon

Liverpool, UK

#41 Jul 6, 2008
hi do u no how dificult it is to change a cdi thanks

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