October 26, 201411 yr Hey guys, bought a 2003 bike a few weeks ago (LOVE IT) and other than the knock it pulls like an absolute train!! Anyway, here is the video of the knock. Some friends have suggested the small end bearing. My dad has just rebuilt his Beta Techno and it sounds like a sewing machine compared to mine now!! Any ideas? Also, I live in the UK and I can't find a small end bearing/con rod kit anywhere. Does anyone know where would be best to look? I don't mind paying overseas shipping if it is this that's the problem. Cheers
October 26, 201411 yr Author Hard to tell by the vid, but it sounds like main bearings. Yea, could be. It does sound like a lower tone in person. Here is another vid:
October 26, 201411 yr Since it has a knock that bothers you then you need at least the head and barrel off anyway. Far better to properly inspect and measure than waste time guessing from sounds. Sounds top end to me, either piston slap or little end. Edited October 26, 201411 yr by dadof2
October 26, 201411 yr Take the head and barrel off I think it needs a new piston and maybe the barrel re nickasilled
October 26, 201411 yr 100% piston slap, the piston has 3 rings and that keeps the top of the piston very stable, but the bottom of the piston when worn does move around a lot It'll still run good as the rings keep the compression but defo worth fixing, Sandifords do a complete kit for £140
October 27, 201411 yr Author Since it has a knock that bothers you then you need at least the head and barrel off anyway. Far better to properly inspect and measure than waste time guessing from sounds. Sounds top end to me, either piston slap or little end. Yea I would like to fix it. I'll do the full piston kit I think. Is there anything else that is worth replacing while the head is off. Also, is it a hard/big job? I haven't been around bikes much, only cars. I also know that 2 strokes are a different beast. more than likely piston slap Thanks 100% piston slap, the piston has 3 rings and that keeps the top of the piston very stable, but the bottom of the piston when worn does move around a lot It'll still run good as the rings keep the compression but defo worth fixing, Sandifords do a complete kit for £140 Right OK, thanks for pointing me in the right direction on parts. I'll have to keep running it as is for the moment though as the piggy bank is getting low Does the noise change when you pull the clutch in? No not at all.
October 27, 201411 yr Its an easy job, i take the whole engine out and do it on the bench but some people like to keep the engine in the bike
October 27, 201411 yr That sounds just like mine and I've been told it's the top end and would be best swapping the piston while I'm on! But I'm really not keen on pulling the engine to bits! Any tips?
October 27, 201411 yr Author Its an easy job, i take the whole engine out and do it on the bench but some people like to keep the engine in the bike Alright cool, I'll see how I get on cheers.
October 27, 201411 yr Alright cool, I'll see how I get on cheers. If you give it ago can you let me know how you get on? Then I may set too myself!
October 28, 201411 yr Author If you give it ago can you let me know how you get on? Then I may set too myself! Will do. Probably won't be for a while as I just splashed out £200 on new boots/gloves/helmet haha
October 28, 201411 yr Will do. Probably won't be for a while as I just splashed out £200 on new boots/gloves/helmet haha I may have a go first then! Hahaa Any one know the best place to get a top end kit?
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