Simpjd

Many thanks, that’s really helpful! On another topic, any idea where I can get a replacement fuel mixture screw in the UK for this carb? Ideally one which is easy adjustment….

Hi all, just taken the carb apart for the first time on my 2010 Evo 4T. Couple of questions. 1. this small part fell out from somewhere, however I no idea where! Any ideas? 2. Pages on this forum talk about the correct tuning of this carb. The jet sizes and mixture screw are now setup. However they also talk about a spacer and needle position. The needle position is supposed to go from 2deg to 3rd and the spacer is to be removed. Anyone know how to set the needle position and spacer? I don’t know what these parts refer to…?

Thanks all for your advice. I completed the seal change this weekend, built back up, tested, all went well. Wanted to post here my finding in case anyone is reading this in the future. Before proceeding I doubled check by contacting the seal manufacturers direct. Referring to my very original post, the seals were in fact the wrong way around, as most people on this forum advised me (thanks again for your help!) I learnt: - the writing on the seal always is on the non-oil side, so you can see it once installed (under the dust seal). Makes sense. - the protruding lip is a wiper lip for the non-oil side (as other people mentioned). - didn’t get on the pyramid parts seals (as found on eBay), got odd balls (I think they were called) instead. Seemed much better quality. - the video I posted above is really helpful. - it’s fiddly to get the bushes in before the seals, however I ensured the bushes were all the way in and flush before lowering the seal. I think this helped. - as lots of people say, really check for any damage, scratches, nicks etc and fix before proceeding. - I made a seal driver from some 50mm blue water pipe. Had to file down the inner and outer edge to make it fit perfectly (I allowed the wiper lip to sit inside the pipe so it wasn’t damaged). In the end it worked great. The nice thing is that you have have a longer length extending above the fork so you can tap it with a hammer. Makes it much easier in my opinion and actually better than a normal seal driver.

Seems to be lots of conflicting advice on the internet about this topic…. Not sure if the above photos help? I’ve got the first photos facing the oil side. It has a bigger softer lip that stick out and I assume will be pressurised tight from oil pressure. However, the writing is on this side and some people say writing should be facing the non oil side, where is can be seen. If I put the other way, when installing id also be hitting that bigger softer lip with the driver….sure that would damage it.

Also they were install before the other way up and leaking badly (when I get the bike). So maybe this is why?!

I’m starting to feel like it’s correct in the original post…. if I look at the way the seal works, oil needs to get up behind the seal to compress it tighter…it looks to me like the low tapered side (with the more visual steel band) should then face the oil (face down). it would also make sense as to why there is a cup shaped part below the seal, to protect this lip? or am I talking nonsense?!

Both correct? So they can go either way?

Great many thanks! I was actually following this video (see 13:00). So it looks like he’s got it the wrong way too then?

Sorry for the stupid question. 2010 beta evo fork seals. are these the correct way up?

Thanks for the advice all. been a bit of a nightmare but got it sorted and back running. To get the tank completely dry (after leaving the bike drying it in a hot room over night) I used a heat gun (like a hair dryer) to blow hot air into the tank, but also had to lift the rear wheel near vertical get get the water to move to the other end of the tank. This is because there is a sort of baffle at the bottom of the tank which water was getting stuck behind, and not drying naturally. This might actually be there to trap water at the bottom of the tank instead of putting it through the engine. However I wanted the whole thing bone dry before I put fuel in again. I then filled it to the brim with petrol, no leaks, all was good. So now sorted however I’d still love to know what caused this in the first place…. And also for the future if anyone else has any experience trying to flush a beta evo fuel tank (being inbuilt into the frame).

Haha yes on this side of the pond we call a flashlight a torch I managed to give it a bit of a clean, not perfect but better. Letting the tank dry out and then going to full it with petrol (gas) and see how I get on.

Many thanks for this - I’ll take a look!! Out of interest, given it’s now 11 years old, do you think they’d still replace it if I found a crack?

Thanks for the advice, and I agree. What do you think is the best option to try and remove it?

It’s a right pain with the tank being part of the frame. Im thinking to try and flush it through with hot water, and maybe bicarbonate soda?