badassbikerbastard Posted December 14, 2008 Share Posted December 14, 2008 Hi all My son has put a Big One exhaust and a performance air filter on his DT 50 MX but when it gets past half throttle the engine bogs down. I think it might be the main jet that needs increasing in size, if I'm right any ideas where I can get one? Any help appreciated Cheers BABB Link to comment Share on other sites More sharing options...
Moderator Airhead Posted December 14, 2008 Moderator Share Posted December 14, 2008 Hi all My son has put a Big One exhaust and a performance air filter on his DT 50 MX but when it gets past half throttle the engine bogs down. I think it might be the main jet that needs increasing in size, if I'm right any ideas where I can get one? Any help appreciated Cheers BABB Yes you will need a bigger main jet, find out what size it is now,... and then try you local yamaha dealer, or Fowlers in bristol, or have a word with Steve Here Link to comment Share on other sites More sharing options...
wild foamy Posted December 15, 2008 Share Posted December 15, 2008 the stock DT50MX jet is 82, most likely fitted with the Mikuni carb. jets are available from www.bitzforbikes.co.uk, www.motorcarb.co.uk, have a quick search on the internet and you should find plenty of suppliers . mine is running a Bigone exhaust, expansion chamber and a K&N style filter, at the moment i think it is running a 90 or 95 size jet... will be putting a big bore kit on it soon so will probably go up to 110 or around that area if your not planning to big bore it or play with the carb/reeds/induction then i would think a 95 is the way to go - Steve P.S. what year is your DT?, mine is a 1990 so aslong as yours is 87-93 it should be the same spec Link to comment Share on other sites More sharing options...
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