Beta

Ongoing problems with my son's Beta Techno. It used to cut out when the fan cut in and the engine was running at tick over. Now it won't start at all! Looking on the bright side, at least it doesn't cut out any more! There is no spark. Tried different plug and disconnecting the Yamaha Stop Switch, but still no spark (even in the dark). I suspect the stator windings have finally packed up and am now struggling to get the flywheel off as I don't have a flywheel holder or puller. Can anyone help with the following questions: 1. Is there a simple test I can carry out on the wires from the stator to confirm it's faulty. (I have an Ohm Meter) 2. Can I use an air ratchet…

I have tried everything to get my 2012 beta Evo 125 running well and I'm almost there. I'm just wondering if I need a hotter plug. My plug is always carbonised. It is dry black not oily wet. My previous evos all had perfect colour plugs and we're light tan whenever I checked them. Im now running 80:1 Castrol power 1 fully synthetic. Air screw is 2.5 turns out. Exhaust and silencer fully decarbonized, carb standard setting and air filter spotless. I run 99 octane petrol. My current plug is a ngk Br7es. I understand the higher the number the colder the plug with ngk. So I'm tempted to drop to br6es. I'm in the UK so it's seldom warm. Does anybody think a hott…

I have recently started working on my beta techno 1999 trials bike that I had ripped apart with my dad donkeys ago and to be forgotten about, I am new to bike mechanics as this is the bike I'm using to get my bearings with and I'm loving it! Until I had reached the dreaded electric side of things, I have done some research and quickly found out I know p*** all and should have payed more attention in my science class.....but have picked up a few things so far thankfully. I am struggling to get my head round what wires go where from the stator (or if its correct) and where to put the regulator. The first two pictures are the original wiring and as you can see it w…

Just spent a few hours stripping down swing arm, suspension and linkages to regrease. All bearings looked fine so used a good quality grease and reassembled. I was just wondering if it matters what orientation the bushes have to go back. Obviously one side is longer than the other. I'm pretty sure I put them all back with the wide sided bush on the outside and thinner bush on the inside. Would it matter if I have got them the other way round. I only noticed they should go back in a certain way when I looked at the beta parts diagram today. I would rather not have to take it all apart again to check if it doesn't matter.

Hello! New member here, so please be patient 😅 I've got a few months ago my first trial bike, a 2007 Beta Rev 270. After a few weeks I started having fun on it, but I kinda crashed against a few "limits" of the bike: speed and power. Of course they're not made to be "fast", but I always have to front some km on the road to reach nice places to have fun... and the bike is too slow, to the point of being dangerous. My bike has a Mikuni carb that I'm dying to swap, as it always needs the air screw to be adjusted... and I always hated Mikuni, even when I had KTM supermotos. Anyway, I'd need to make the bike a bit faster/more powerful to not be crushed by cars o…

Hi there. My bikes revs dramatically increase when bike is on an incline (front higher than rear). Even an incline as little as 10 %. I've checked floats and they are set properly and appear to cut off when perfectly horizontal. This has been a long running occurance. This weekend I have stripped and cleaned carb, decoked front pipe, cleaned and repacked silencer, cleaned air filter, new plug and changed premix to Castrol power 1 racing. Running 50:1. I'm going to have a play with the air screw and get that set properly as I think it's running rich. Any idea what could be causing this ? Obviously it was like this before I carried out the weekend maintenance. I …

I’ve been recommissioning a 2004 Rev 3 and although it appears runs ok (on the flat, yet to try on the hills) my Rev 3 appears to have a bit of a piston knock at all revs. I’ve taken off the head and although a bit coked up the piston and cylinder bore looks in good condition. Whilst there is no detectable play vertically, I’d estimate 1mm play fore and aft and side to side for the piston in the bore. The piston is stamped 72.457 (04-14 8724) and I wouldn’t be surprised if this is the original piston but can’t find the exact measurements for the pistons or oversize replacements if anyone has these please? Is the lateral play acceptable or does this point to cylinder/…

Hello all! (sry for my english, i am from italy) I want repair the beta rev3 270ccm (2007) from my brother, this bike is never working good, has always a problem whith leaking gas... When i open the gas (the bike is off) its leaking gas out of the carb..(the carb is clean and the neadle looks not bad) I hath reading billyt carb mod but ist hard do understand it with my english... I have found this pic on the forum from @dan williamsnow i have please a question: 1: the red line is the right setting of the tangs? 2: the green line is the right setting of the little tab, to stop the tangs from fall down(1/16 over top left hand lower to…

Guys, has anyone replaced the bars or used risers on their Beta Evo? I've got a standard Beta Evo 2013 and find the bars low, a lot of my weight therefore seems to be forward and my arms/hands get pretty tired. I've changed the footpegs to Titanium Raptor Pegs which maybe higher than the standard ones changing my riding position? I'm 5'8" tall so I'm not exactly tall, but get the feeling a slightly higher set of bars might feel more comfortable? Any ideas, personal experiences re changing bars would be great, I know Renthal, S3 to name a couple do higher bars. Not sure what rise the standard ones are though?

I need a wiring diagram for this bike, can anyboby help please

I hope this is the right place to post this.... I'm in the market for my first trials bike for many years (53 now), I've never done it competitively and want to take it up. I've been watching the classifieds like a hawk the last few weeks and am agonising a bit.... I've pretty much decided I want a Beta from what I've read but the agonising part is the price difference between an older Rev and a newer Evo. 15 year old Revs seem to be priced anywhere between £1400 - over £2k in some cases which seems steep for an old bike whereas I've seen much newer Evo 250's for between £2 - 2.5k. To be honest, I was hoping to get going on about £1500 to see how I got on, …

Hi all Looking for some advice on my beta 250 evo 4t what are your views on dropping a tooth on the front sprocket ie what will I gain or lose from it thanks

Good morning I have just bought my first trials bike, its a "itch" that's needed scratching for a while, it was sold to me as a 2004 beta 250, very tired looking but with reams of very recent receipts (new piston etc) which either means I am set for a while or its a "nail" and he got fed up of spending on it!? but the receipts suggest its 270cc! once I work out how to upload some pics I will.. the rear mudguard has been snapped and has had a terrible cable tie repair,, I am shocked that they are not available!.. I will no doubt have loads of questions but I am moving to Spain next week so barring a 1 min ride I had no time to go get familiar with it before packing i…

Hi my 2011 Evo 4t recently started overheating upon checking various things I found the water pump impeller was missing. There has been various posts about this eg excess heat has melted them. On mine there is no trace of any bits so I can only assume it was never there. Past posts never came up with a definite answer but hopefully others have has this problem and got to the bottom of it. Any views on this mystery. One other question Is the camchain automatically tensioned or is there a way of doing it manually. Many thanks in advance for any replies.

Could someone please advise me what size c spanner i need for the steering head nut below the top triple clamp? My shock c spanner is too big. Thanks.

I am having problems sealing my front forks on a 2013 Beta Evo 4T. I have changed the seals (not for the first time) but they still leak. Tried new bushes and another set of good quality fork seals, still no joy. Legs are smooth with no blemishes although the black friction coat has worn away. Any thoughts? Should I be looking to get the legs re-chromed or could there be something else amiss? Having looked at the parts catalogue internals look more like the 2014 model - https://cdn.shopify.com/s/files/1/0312/4301/0185/files/2014_Evo_4_stroke_parts.pdf?v=1592579609

Hi, I’m new around here and about to take up trials in my early 50’s. As explained on another post I’ve had bikes all my life, once had a TY175 briefly but never done nothing competitive. I’m torn between getting another TY, either a 175 or a 250 mono or going for a used Beta Rev as they seem more abundant and the prices are maybe a little less silly (although all prices seem a bit silly since lockdown!). I don’t really want to spend more than £1500 or so at present until I see how I get on with it if possible. Question is, ideally if I get a Beta I think I would want a 200 from what I have read as I don’t want a bike that’s OTT for my novice capabilities. …

Hi, I’m just recommissioning a 2004 Rev 3 that’s been laid up for a number of years and could do with some clarification with respect to how to correctly set the chain tension. The manual shows 20mm gap from the top of the chain tensioner to swing arm. Not easy as my tensioner is a bit skew-if, and is this with the bike supported on a centre stand, on the ground or loaded etc.? Searching for an answer throws up various methods and suggests tension should be set with the axel / swing arm pivot / front sprocket aligned i.e. effective maximum length. Any help as always gratefully received! Cheers

See https://www.betamotor.com/en/moto/evo-2t-125-250-300/ So "major updates have been made to the graphics of the bike" plus "the air filter box is now red"! Oh, just to keep development going forward, "the suspension has been updated with revised fork settings to optimise the damping curve in both fully compressed and fully extended states". Perhaps the pandemic.has restricted the development engineers' creative thoughts? On the other hand I guess the existing bikes' capabilities far exceed those of the average rider so why change when a formula clearly works pretty well!

Good evening Got rev 50 for my son, at the start had no spark, so got new stator and all was OK, till bike start bogging out and stoped. Cleaned carb, tank, air filter. Got new piston in, 2 new spark plugs and still no joy of it. Wet plug after few kicks.... Is this can be CDI unit problem??. not too sure never had beta before. Or any other ideas?? Any help is welcome :) Cheers