griggy35 Posted February 4, 2018 Report Share Posted February 4, 2018 Hi there.couple of my pals just bought 2018 beta 300 4t and we are all having problems under load the bikes are misfiring can anyone help???as these are brand new bikes to.many thanks any help would be great Quote Link to comment Share on other sites More sharing options...
griggy35 Posted February 4, 2018 Author Report Share Posted February 4, 2018 Hi again.we have moved from 2017 repsol Honda s to new 2018 300cc 4t beta and are now thinking it was a bad move lol.has anyone else tried both bikes and if so what are pro s and cons on the 2 machines?many thanks Quote Link to comment Share on other sites More sharing options...
fred_savage Posted February 4, 2018 Report Share Posted February 4, 2018 What are your gripes with the Beta? Quote Link to comment Share on other sites More sharing options...
huski Posted February 4, 2018 Report Share Posted February 4, 2018 Take them back as they're brand new,don't touch them 2 Quote Link to comment Share on other sites More sharing options...
gasserguy Posted February 4, 2018 Report Share Posted February 4, 2018 Dealer problem......... 2 Quote Link to comment Share on other sites More sharing options...
griggy35 Posted February 4, 2018 Author Report Share Posted February 4, 2018 38 minutes ago, fred_savage said: What are your gripes with the Beta? Misfiring under load.changed plugs still no good all 3 of bikes same fault.didnt have any issues with montys.can you help? Quote Link to comment Share on other sites More sharing options...
timp Posted February 4, 2018 Report Share Posted February 4, 2018 Is the carb tight in its rubber sleeves? Too much oil of filter. Mixture screw correct. Standard silencer or aftermarket? Quote Link to comment Share on other sites More sharing options...
dick Posted February 4, 2018 Report Share Posted February 4, 2018 Water in the petrol? Warranty! Quote Link to comment Share on other sites More sharing options...
griggy35 Posted February 4, 2018 Author Report Share Posted February 4, 2018 All sealed.everthink tight.airfilter brand new oiled.all bikes filled up same pump and only beta s had problems.2 of the bikes had standard exhausts and one with ti arrowe pipe Quote Link to comment Share on other sites More sharing options...
basil Posted February 4, 2018 Report Share Posted February 4, 2018 As Timp mentioned mixture screw, I believe bike supplied to dealer are adjusted to homologation/euro 4 ? settings ,pdi dealer should re adj to the competition one Quote Link to comment Share on other sites More sharing options...
lineaway Posted February 5, 2018 Report Share Posted February 5, 2018 Don`t say where you are, but in our club the Beta runs better than the Montesa. There is a rev limiter on the bike. So if you are reving a new bike to the moon in neutral then it is you. They do come lean. Must be jetted and fitted with Jitsie thumb screw. My boys bike runs way better than the new Monts. By the way my employer has 11 4rt`s, all years and it drives him nuts we ride Beta`s. And yes, we ride new Cota`s every week. Quote Link to comment Share on other sites More sharing options...
carlos Posted February 5, 2018 Report Share Posted February 5, 2018 I found the stock main jet size was way too small (stock is a 120), ended up running a 130, also noticed that the clip on the needle makes a huge difference. Mine get's a lot more low end grunt running the clip on it's 2nd lowest position. It's a 2016 300 4T Factory edition with the ti pipe. Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted February 5, 2018 Report Share Posted February 5, 2018 Apart from being the same model there is one other thing in common - the petrol. Try using different petrol just in case, but as stated, you really should be going back to the dealer before taking anything apart. Quote Link to comment Share on other sites More sharing options...
geniejlg Posted February 5, 2018 Report Share Posted February 5, 2018 Hi Try 1 bike on Shell V Power, Good luck. Quote Link to comment Share on other sites More sharing options...
timp Posted March 10, 2018 Report Share Posted March 10, 2018 On 04/02/2018 at 7:46 PM, griggy35 said: Hi there.couple of my pals just bought 2018 beta 300 4t and we are all having problems under load the bikes are misfiring can anyone help???as these are brand new bikes to.many thanks any help would be great Did you get to the bottom of the problem? Quote Link to comment Share on other sites More sharing options...
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