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It may be nothing and just me being paranoid then, I’ll include a link to another video I have taken and if that doesn’t help I’ll try get one like you requested. Thank you for your help though You can hear a kind of meshing noise on deceleration, as I say though it could be normal

I could not tell much from listening to your video at 1x, 0.75x, and 0.5x speed. I think a better diagnostic would be to video the bike running on a stand in 4th (probably would have to load the motor by using the back brake) and slowly letting it rev. Note that both 1st gear and 4th gear use three gear-pairs to transmit power though the box. So the whine should be similar for 1st and 4th. There is a large ratio change between 4th and 5th, and this will make a clunk and not be smooth. The farther apart the ratios are, the more pronounced this will be.

Check your rear wheel bearings for play. I was in an event and had a horrible clicking noise, so much I thought something was wrong in the clutch / transmission. I went so far as to pull the clutch cover off in the paddock to investigate. I found nothing, DNF the event. later discovered the rear wheel bearings were sloppy as all hell and was causing the rear sprocket to move out of alignment enough that the chain would "click" off the edge of the sprocket. I couldn't really hear the whine, so I would say it's probably normal. I can't remember if you state you changed gearbox oil or not, watch for tremendous amount of metal shavings or chunks on the drain magnet. Some small gook type build up is normal.

Hi again, after stripping head and barrel I discovered back two barrel bolts were able to be loosened by hand and a very thin and compromised base gasket. Manufactured a nice thicker new gasket, reassembled and torqued everything to spec and started 2nd kick and after warm up idled nicely, Hopefully bullet dodged. Cheers Rob.

Hi, sorry about the jumping between posts I’ll try keep it on this one now, I’ve uploaded a video to YouTube in case you or anybody with either a similar issue or similar experience can listen to. Thanks in advance to anyone who gives it a listen and helps and hopefully this helps you too if you’re here for answers 🙂 hopefully it works. I should mention I’ve been told the clicking is a worn chain or sprockets so replacing the lot.

It may not exactly sound like it’s going to blow up, but it is very whiny. I would include a video but cannot post iPhone videos. I can hear it whine when in 4th but 5 and 6 are fine I believe however the change up is clunky 4/5 I put it on “trials bikes uk” Facebook group on Sunday afternoon and the general idea is that it’s normal anyway

At first, I was going to say the "assembly" number is the service limit. But viewing that table in the context of the other displacements, it makes no sense at all. It's a horrible table!

Thanks for the feedback. It's been both enjoyable and annoying at the same time. Not sure if I'll do another that needs quite so much work. 👍

that looks a nice job, well done.

I was curious so looked at the manual. It looks like the minimum piston clearance for the 250 is 0.050 and the maximum is 0.080. What is the 0.100 "Assembly" number?

Just thought I'd share a few photos of my 349. Just needs a couple of tweaks to get the gear change sorted and rear brake adjustment. Then get it registered. It's only taken 15 or so years!

wix-one... I have an ePure Race with a similar noise.....Did you ever resolve this issue?

I had a "Goldfinger Sprite" and the pictures shown here are just the standard 125cc Sprite. The Goldfinger had a deep glitter gold fibre glass tank, gold painted frame and the Sach's Sunburst engine with the large radial fins on the head and barrel. It was a brilliant little bike, light as a feather and quite responsive. I have been looking for one for years but they are like Hobby Horse pooh.

Paint shops can usually match a colour by scanning what you are wanting to match

Hi all, Beta Evo 2009 250 2T owner, but too many pies mean I am about 100kg. The shock is almost bottomed out with my weight on it, maybe at 16 years old the spring is tired, as well as being too light for me. I think I can get a 'heavy duty' spring new for around £90, but these are stated as being for 80kg riders. Can anyone recommend what I need, and where from? Ideally... has anyone got a second hand heavy spring I could buy? I am in Scotland by the way - but happy to pay shipping.

Been riding some 40 years had three rmx 250. Ran 50 to 1 all day everyday put a 10 oz flywheel weight rode slow to flat out bike loved every minute. At 68 I am doing trials on a 2003 Beta rev3 270 and have been running 70 to 1 since day one with no issues. Going slow with a blast here and there bike loves it 93 octane with full synthetic. On the flip side running a little rich and fowling a pug is better than running to lean and burning a set of rings

That's a very nice manual! Anyone learning to do maintenance on a trials bike (regardless of brand) would be well-advised to study it. Unfortunately, there is almost no content about the gearbox (see page 49).

SamAs, I don’t think I’ll be much help to you but I have a 23 TXT 250 that does NOT whine when shifting to 4th. I think the engines are nearly the same as the 2017 but I could be wrong. I’m no mechanic and there are others on here that will have better judgement than I, but I simply wanted to let you know that in my experience, on my bike, there is no whine shifting to 4th. If there was I would be worried. So far, working on my own bike, I’ve found it’s simpler than I ever imagined to do it myself. If you’re mechanically inclined and have common sense, I’d say go for it on your own. Just review and follow what you find in the maintenance manual if you have it. I’m all about saving cash too. Good luck! you can download the 2018 manual for free here: https://drive.google.com/drive/folders/1xOzbrZQDO_W_AxpjvHU1xJMOqfRsVfPJ

It should NOT sound like it's going to blow up! But 4th gear is "complicated" and actually requires 3 gear pairs to create the ratio. Here is a link to a YouTube video that demonstrates this, as well as the original GG patent in Spanish: https://www.electricmotiontech.com/home/em-factor-e/clutch-gearbox#h.2ajazdf2rs5

Thanks for that. Managed to split the lot and buy just the spacer. Cheers.

Hi all, Ive recently got a 2017 txt racing 300 and it’s making a noise in the gearbox. There is a ticking noise that im assuming is the chain as it does this in time with the master link. But once I shift into 4th gear the box starts to whine like crazy. I know theyre straight cut gears but it sounds like a race car, it’s almost louder than the engine. I’ve been told that it’s a case of possibly bearings or something in the box but seen on an older post on here that the whine is “somewhat normal” im just trying to figure out if I need to take the engine out or not as I’ve never done it before and dont want to do it if I don’t have to. But I want to do as much as I can myself to save money as the bike cost me a lot. thanks in advance for any help, I might end up taking it out soon anyway it’s just a bit daunting

Erm how somewhat normal is the whine in 4th? Because Ive got a 2017 txt 300 and when I go into 4th It sounds like the box is about to blow up

There is a spacer on ebay.co.uk now with a flywheel and weight £52.49. Did you try the importers they list as around $12.

I have a 2014 evo 300 and want to add a flywheel weight. I have a Hidria weight from a rev 3 but suspect I'd need a cover spacer, which I can't find. Does the S3 weight fit without the need for a spacer?