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kaarelj

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  1. kaarelj

    80's silencers

    Cheers, thanks for answers. Will post here, if some success "Loud" is not maybe the correct term. Annoying could be better term. Some new 125's are really nice and quite, but 80's are naturally high-pitched. And on the louder side. Of course, cannot be compared to some empty-barrel 300s
  2. kaarelj

    80's silencers

    Hi Beta riders! Is there any good alternative for Beta 80' jr and sr silencer? Like 2010 onward (maybe even earlier models) Original is just piece of useless metal. Mounting will tear or break even on moderate use (I haven't seen a single unit which is not welded or fixed otherwise). It will immediately start scraping to tire. And in general quite loud, I'd prefer something more quiet. Have you had a chance to replace it with something better?
  3. Thanks, most probably overthought it. As soon as he stepped onto the bigger frame, it was all clear. Not that big at all and if to feed them well... Still 80cc. But as the market is quite good for the 80cc then it is not that big of a hassle to change it to bigger next year.
  4. Hi, How to decide, if junior-frame or fullsize frame 80cc. Both kids are riding, one with Beta Jr 80cc and other decided to ride petrol, so we'll ditch the Oset. Both are same size 12yo 155-160cm height. Should we take Beta/GasGas 80cc full size frame or Jr/cadet frame as a second bike. So one of them would advance from Jr to fullsize frame. For me it seems quite natural to keep them both on smaller frame for a year or so. But there are some riders advocating for bigger frame without any proper reasoning. It seems that bigger frame (and tires!) are easier to balance and better climbing on natural obstacles. But on the other hand I'd like them to practice good technique and not to make life too easy for them. It is not very competitive riding, more to have fun and get some balance in life.
  5. Pantone 3517C - order for some other model GasGas way back. But did the whole bike. But don't take as granted. GasGas supplier should be able to sell you can or pen for touchup. But take caution, 10year old paint is worn-torn-UV baked. Exact match could be impossible.
  6. Slave cylinder gasket could be also worn out. But it would puke the oil into gearbox. So the oil level should decrease with lever pulls. Easy to check, just unscrew 3 bolts and hold (pinch together) the slave cylinder with thumb. You either feel no pressure when pulling clutch lever (worn out master cylinder). Or you might feel slight pressure but definitely see some oil puking out. You'll figure out how to disassemble clutch master cylinder. Most likely the master cylinder piston gaskets are worn out. Then the oil will pass from one section to another and straight back to reservoir. Thus not generating any pressure. On Betas case the master cylinder is not repairable. So buy new one or swap with Braktec. Braktec BT46000CT-CWT-1 worked fine for me as piston diameter is the same (9,5mm). Same is used on all GasGas (from 80 to 300). Just point out that mineral oil is used, not dot4.
  7. GasGas still has master cylinders with repairable internals. Diameter is the same so it should be good fit. And all models seem to be the same component. Goodstuff, will change to GasGas parts or who-ever is the actual parts vendor for them.
  8. What probably follows is rant on repairability of stuff in general .... Beta Evo 80 jr 2017 - clutch master cylinder with slave cylinder failed. Dirt got in, chewed hefty portion of master cylinder piston gasket and then continued to chew the green gasket on slave cylinder. Two things to order: As slave cylinder was ok (with scratches, but ok) so only thing to replace is piston gasket. A very specific O-ring. O-ring is not available separately, so whole slave cylinder has to be ordered. 30-40€ smth like that. Fine, but still a pity that I couldn't order a O-ring only. Now Master Cylinder piston replacement kit is actually available in the parts list. But it happens that Beta does not manufacture them separately, so I would need to order whole master cylinder set. 25€ vs 120€. OK-fine, motorsport doesn't have to be cheap. But bikes are so easy to work on and my kid having a bike - one aspect is mechanical education. Disassembling and analysing what went wrong is big part of the motorsport life. And philosophically it is seriously sad to see, that we have to order whole part instead of broken component. What next, shocks gaskets will become irreplaceable? 40€ vs 400€ in money and no kid will ever see how shocks work. Before I am ordering a new set. Do you have any suggestions? Is there a third party supplier from who I could order master cylinder which would be repairable and maintainable in future? Or is there any other Beta master cylinder which has spares (asked that from my Beta supplier also). Most likely it does not matter who's to use as the ratio is ~moreorless the same.
  9. kaarelj

    E10 Fuel

    The ethanol topic has seen some attention recently, maybe you could receive some info from there? By heart I would say if it sat for some period, et could be directly related to E10 but no personal experience to refer.
  10. Fast is not an issue, as the First gear is slow and there's a lot of room around them. Plus they are going much faster on their Oset, so all good there. Even if the initial acceleration frightens them, then nothing can happen as the max speed will reach momentarily. But yeah, it took some practice, on third day one of them is capable of doing quite ok in terms of slow slalom and eights. Even trying to do some wheelies with clutch, failing in timing or overdoing completely 😂 Other one is more cautious and takes some more time. Kids are different. Most useful so far has been just riding time. I've let them to free ride and every once in a while give some tasks to do like slow slaloms or stop and go's. And then just free ride, so they start feeling ok.
  11. I've seen few in noncompetitive situation on training. Quite bad to be honest. Geometry is weird, distance from handlebar to foot peg is longer than on 125/250cc fullsize bike. But Kuberg is meant for smaller crowd. Buti t is a long bike, compared to Oset 24 it seems allmost a foot longer. Kuberg Challenger has 14" rear wheel. Yes, powerful motor, but the ~13yo beginner had a serious struggle there. Small rear wheel with huge amount of power caused it to just spin everywhere. It was a struggle to lift the front wheel. Seemed to be almost impossible to climb slowly on soft terrain. And the ride height is quite high hence loosing some balance there already It seems to be cool ride for freeride in forest or fast MTB/FullSuspension trail. But it does not seem to be good fit for Trials. Don't get me wrong, it looks cool and it would be really cool to freeride and have fun with it. I made a real quick mockup for comparison with Evo80jr and Beto FullSize. Although the Kubergs commercial image makes the rear wheel a bit larger IMO. IRL it is actually smaller I would say.
  12. Only tyre I've found is the Vee Rubber V308 3,5/17. I don't know which tyres it is on from factory, got mine second hand But yeah the 17 is difficult to find. Some say in EU, the Vee Rubber is only option.
  13. Nice, thank you guys. We were able to make first proper circle. At the moment keeping the "training" short but goal is to make bike run every day even for 5-10minutes. So the muscular memory would start to kick in. They are just not used to the first punch the petrolengine gives you when releasing the clutch and kind of scares them. Because the electric has this short moment of power buildup and the acceleration characteristics are completely different.
  14. Hi, Your suggestion, how to get kids to master throttle and clutch control? First on the very basic level of get moving and stopping. Mastering clutch and throttle is endless journey. Kids 10 and 11 are both okay with Oset and quite confident on wheels. Now they have their first Beta 80 jr. We took our first small step and made first circle with all expected issues like frog jumps, stalls and extensive throttle etc 😅 They kind of get the logic and mechanics, what is the gearbox and clutch and why they pull it. They also kind of know the sound when its too much revs and where is the safe level. I would imagine to start with just start-stop on flat ground and then on easier slopes for so many hours till they feel somewhat confident. And then take some 8's and slaloms. At least I practiced this way and get to some level. But do you have some suggestions, practices to carry out with kids to make the process as smooth as possible? Cheers
  15. Two things happen with ethanol added fuels. Ethanol is evaporating well under warm circumstances, lowering the octane value in fuel. - not a big deal and impact is not that high And ethanol is good in binding water from air and then it condensates in your bike fuel system. I had few carb engines lying around and made a "scientific test" 😆 within two month time one ride-on lawn mower engine build up nice amount of residue and rust in its carb. And I was riding it after every two weeks. Yup, carbs and fuel systems are different, but still. And I've seen the same pictures and posts from workshops after they introduced E10 fuels around here. And ethanol does not do good for some carbs membranes It is not an issue on your daily, but I wouldn't put any of the E10 fuels to bike which could only be used only weekends or even less. Specially if you have more than one bike waiting for their turn in garage. Because I don't ride that much at once and do it around my backyard with kids, then using Aspen Alkylate. And almost every performance engine owner (quads etc) are riding on Aspen+ which is very clean RON98 fuel. Not a commercial break, just only available brand around here. --And I am not starting on the politics, of how it is reasonable to harvest some crops, mash them, distillate them and then add it to fuel and say it is somehow more green now. By that lowering calorific value of the fuel, hence needing more fuel now.🤔
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