Hi,
I was wondering if anyone could assist with a problem I'm having, I have a 2004 KTM 300 EXC. I am a student and bought the bike second hand. The bike is not in mint condition and has done a lot of riding in its life. So with that in mind I’d just like to ask what list of things you would start checking in order to start trying to find the problem. I am mechanically very competent but don't have the money to just replace everything because its used, hence why I'm trying to pinpoint it.
For the first year of riding the bike really struggled to get into band. For example in 3rd gear I would have to accelerate until the bike sounded like it was limiting, then if I fiddled with the throttle for a while, opening and closing it in little bits, it would eventually get into band and pull hard.
I then put a new piston in, pro-x oversize C because my cylinder was abit worn. The problem was better but was still there. I then found a huge amount of carbon build-up in the exhaust which I burned out. The bike then ran much better!
However, when on a flat surface it struggles only a little bit to get into band when in higher gears, but when on a hill climb it won’t pull into band in third and above. Another interesting fact is that if it gets into band in 2nd gear and I carry on accelerating hard through the gears it’ll stay in band through all of them, but for example if I am in band in 4th and change to 5th and then coast for abit, and then change back to 4th and go for it, it will sound like its limiting and won’t pull unless I keep playing around with the throttle and it may or may not get back into band.
I was wondering if anyone could assist with a problem I'm having, I have a 2004 KTM 300 EXC. I am a student and bought the bike second hand. The bike is not in mint condition and has done a lot of riding in its life. So with that in mind I’d just like to ask what list of things you would start checking in order to start trying to find the problem. I am mechanically very competent but don't have the money to just replace everything because its used, hence why I'm trying to pinpoint it.
For the first year of riding the bike really struggled to get into band. For example in 3rd gear I would have to accelerate until the bike sounded like it was limiting, then if I fiddled with the throttle for a while, opening and closing it in little bits, it would eventually get into band and pull hard.
I then put a new piston in, pro-x oversize C because my cylinder was abit worn. The problem was better but was still there. I then found a huge amount of carbon build-up in the exhaust which I burned out. The bike then ran much better!
However, when on a flat surface it struggles only a little bit to get into band when in higher gears, but when on a hill climb it won’t pull into band in third and above. Another interesting fact is that if it gets into band in 2nd gear and I carry on accelerating hard through the gears it’ll stay in band through all of them, but for example if I am in band in 4th and change to 5th and then coast for abit, and then change back to 4th and go for it, it will sound like its limiting and won’t pull unless I keep playing around with the throttle and it may or may not get back into band.
- Bike doesn’t smoke and no splooge coming out the exhaust.
- Doesn’t lose gearbox oil.
- Clean power valve system and I'm fairly certain the problem is not caused by its setting because I've played around with it to see if it made any difference.(I know you shouldn't move it but I assumed the previous owners had adjusted it)
- I run 50:1.
- Jetted according to the ktm jetting chart.
- Noticed that the float level was set leaner that factory spec. I can send photos.
- Compression
- Reeds
- Crank seals
- Floats and jetting (due to worn carb)