Scott8155

No it doesn't blackhat, the noise kicks in at around 15mph, at first it was 25mph, and stops again when the bike slows down past 15mph

Sorry chaps I've been a busy bee. There's no stiff links in the chain, I know by only saying knocking you can't imagine my problem clearly but the noise is certainly coming from the bottom end of the engine, not the front sprocket/chain. I can't really feel it at the foot pegs but it's more of a loud slap and I don't think the vibrations would be strong enough to feel if that makes sense.

No it isn't blackhat, only when moving

Yeah I thought of that airhead, thanks though. I do keep on top of my chain maintenance. It definitely is coming from the bottom end and is a really loud knock

Pretty sure it's speed drewpy but I will double check

Alright chaps. So riding home from work my xt 125 2010 suddenly starts a loud knocking coming from the bottom end of the engine. It happens when the bike is moving past 15 mph, not when idling. Ideas ? I'm not a mechanic but I'm eager to split the engine and have a look and I've learnt slowly but surely. Would it be cheaper to buy a new bottom end or the parts depending on what it is?

Sorry I haven't replied in a while chaps. I've been so busy, family problems + uni and now the bike has gone bang all together!

You're on the ball there Blackheath, as I let go of the button there is usually a few small/weaker sparks. Tried that too airhead, no luck there either. It has both kevtherev, however the clutch one isn't activated now as my current lever is slightly different in shape, but the problem was found before I changed that. The side stand switch still does its job but I suppose could be defective still. Sorry for slow replies guys, been a very busy bee recently. Any idea on how to check the switches that cynic suggested?

Dickwad thanks for the suggestion but I think as cynic said the coil maybe ok as the engine does run, it's the electric start somewhere giving off one spark. How do I check these switches Cynic?

Tried that airhead and nothing. I've had the battery charger fully, and tested with a multimeter when done too.

Evening guys. So my problem is that when I use the electric start on my bike I get one or two sparks no matter how long I told the button then a slight spark when I depress the button. Sometimes this is enough to start my bike, however it WONT when the side stand is down. I usually use the kick start anyway. Its not the CDI as I have a new spare one. So are we thinking stator, ignition coil? Possibly the electric start button? My bike is a yamaha xt 125 2010 Thanks guys

Well the problem turned out to be a faulty wire from the starter relay, finally sorted it! Anyone have any ideas which wires on a yamaha will be the oil light and the EOBD light?

Give me a few hours dt, I'm at university at the moment, I will be home at 2ish, what time that is for you I don't know. Also, I have undone everything I did and wired my old speedo back in for now. One thing I forgot to add what someone has been in there before me (previous owner) and the wiring is shocking! After market indicators taped together, and some terrible crimps around the wiring loom. I'm no expert but Christ its awful. Quick thought; is it within forum rules for me to post the diagram? Well unless I'm missing something, its not the cdi unit, new part just came and I plugged it in. God sake

I'll put one up when I get chance tomorrow, my manual is in the garage. I may be wrong, he's the expert not me aha. I have seen the headlight relay and it attaches just above the cdi. Well regardless of if this is correct or not, we will see when the new part comes this week. Hopefully he was right

My dad's friend is an electrical whiz and showed me why he thought that was so. The headlight relay is behind the cdi so the circuit breaks before its getting there. So we'll see when the new part comes in a few days. I'll let you know dt.