331sam331 Posted October 26, 2014 Report Share Posted October 26, 2014 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 Quote Link to comment Share on other sites More sharing options...
lineaway Posted October 26, 2014 Report Share Posted October 26, 2014 Hard to tell by the vid, but it sounds like main bearings. Quote Link to comment Share on other sites More sharing options...
331sam331 Posted October 26, 2014 Author Report Share Posted October 26, 2014 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: Quote Link to comment Share on other sites More sharing options...
dadof2 Posted October 26, 2014 Report Share Posted October 26, 2014 (edited) 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, 2014 by dadof2 Quote Link to comment Share on other sites More sharing options...
huski Posted October 26, 2014 Report Share Posted October 26, 2014 Take the head and barrel off I think it needs a new piston and maybe the barrel re nickasilled Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted October 26, 2014 Report Share Posted October 26, 2014 more than likely piston slap Quote Link to comment Share on other sites More sharing options...
tail Posted October 26, 2014 Report Share Posted October 26, 2014 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 1 Quote Link to comment Share on other sites More sharing options...
billyt Posted October 27, 2014 Report Share Posted October 27, 2014 Does the noise change when you pull the clutch in? Quote Link to comment Share on other sites More sharing options...
331sam331 Posted October 27, 2014 Author Report Share Posted October 27, 2014 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. Quote Link to comment Share on other sites More sharing options...
tail Posted October 27, 2014 Report Share Posted October 27, 2014 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 Quote Link to comment Share on other sites More sharing options...
lewis315r Posted October 27, 2014 Report Share Posted October 27, 2014 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? Quote Link to comment Share on other sites More sharing options...
331sam331 Posted October 27, 2014 Author Report Share Posted October 27, 2014 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. Quote Link to comment Share on other sites More sharing options...
lewis315r Posted October 27, 2014 Report Share Posted October 27, 2014 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! Quote Link to comment Share on other sites More sharing options...
331sam331 Posted October 28, 2014 Author Report Share Posted October 28, 2014 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 Quote Link to comment Share on other sites More sharing options...
lewis315r Posted October 28, 2014 Report Share Posted October 28, 2014 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? Quote Link to comment Share on other sites More sharing options...
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