pedroply

So today I got the timing chain on and mounted the bike! It started but a noise came up like a tick tack tick tack. It is also smoking a lot. In terms of performance mehh didnt notice any diference so far but hadnt ride it too much either. Any sugestions to what the noise could be? it sounds like coming from the motor head.. Maybe the timing is a little off. It is half a tooth of i think but if I jump a tooth it will be again a half a tooth off in the other direction..

Decided to take it apart again and I m glad I did! After inspecting the bottom sprocket from the cylinder hole I saw the chain was completely out of the sprocket! this probably happen because I m doing all this on the bike normal stand meaning it leans to the left side. It is a pain to maintain the chain in the sprocket so I guess I m gonna put it back together and then try to engage the chain back in the sprocket with the bike leaning right!

Sorry for the long wait for this post. This is the current situation all the parts arrived and today I decided to install them! It was going ok but after switching the cylinder block and mounting the head again the timing sprocket bolt couldn't be torqued to the spec 20 nm without jumping tooth on the sprocket at the other end. Conclusion I mounted it with the rigth timing and torqued the bolt to 10nm. Is this normal? Could the chain be out of the sprocket at the bottom? When I kick the motor it rotates nicely but should I attempt to start it up?

I will try xD thanks for the reply. Didn't knew about those 90mph 125's! I would be happy with 70mph I mean with optimal conditions it could do it even without the arrow exhaust but struggled past 55-60...or even earlier if it was windy! The exhaust really helped on getting to 60mph faster but nothing impressive. I guess the big bore kit will help! Should I be worried about the chinese parts? specially the big bore kit?

Hi guys! I’m Pedro from Portugal. I have an Xt125x from 2008, got it when I was 16 4 years ago. I also have an Honda Z50j it was my daily driver back when I was 14!

So I got my xt 125 back when I was 16 it was cool but always wanted a bit more power... Now 4 years later I’m doing some experiments on her! Heard of those arrow exhoust pipes got one and felt a bit more power! That got me into doing more modifications to it! Has I couldn’t find much about it decided to create this thread here to post my conclusions. Currently I have on the way a different jet kit (110 main, 17,5 pilot) and a big bore kit 150cc all this parts are Chinese lol probably not the best idea but that exhoust was rather expensive... I have read a bit and learned that some people are against modifying this bikes saying there are no gains to be made and the bike will get very unrealiable but I decided to give it a go. Let me now what you think!