Urban Tangleweed Posted September 9, 2007 Share Posted September 9, 2007 Hi, I bought a shed of a DT50 (yes, off ebay...............) and have done lots to it, but it won't run right. It has had a rebore and piston, the 14mm carb was kaput so I got a brand new 16mm (yes, ebay again...............) Starting is great, tickover fantastic, it revs up a treat, but, when ridden, it won't go onto the main jet, you can bimble along on a part throttle all day long (hills are no good though) but open it up and she just dies, go back to part throttle and she picks up again. I've checked, and altered, the float height, it's running the correct 88 main jet, but just won't have it. Do any of you guys know what may be the cause ? Something else which may influence any suggestions, it's running pre-mix, the oil pump does not exist any longer, perhaps I need a much bigger main jet now the petrol has oil in it ? Hope someone out there can shed some light. Thanks, Roger. Link to comment Share on other sites More sharing options...
racerd Posted September 19, 2008 Share Posted September 19, 2008 Hi, I bought a shed of a DT50 (yes, off ebay...............) and have done lots to it, but it won't run right. It has had a rebore and piston, the 14mm carb was kaput so I got a brand new 16mm (yes, ebay again...............) Starting is great, tickover fantastic, it revs up a treat, but, when ridden, it won't go onto the main jet, you can bimble along on a part throttle all day long (hills are no good though) but open it up and she just dies, go back to part throttle and she picks up again. I've checked, and altered, the float height, it's running the correct 88 main jet, but just won't have it. Do any of you guys know what may be the cause ? Something else which may influence any suggestions, it's running pre-mix, the oil pump does not exist any longer, perhaps I need a much bigger main jet now the petrol has oil in it ? Hope someone out there can shed some light. Thanks, Roger. but open it up and she just dies, go back to go back to part throttle and she picks up again. . might need a bigger main or might need a smaller main jet, a plug chop is need to sort this you need to run it in first 500 to 750 miles no more than half throttle, also you need to do a plug chop, when running premix run at no less than 50 to 1 Link to comment Share on other sites More sharing options...
blackhat250 Posted September 19, 2008 Share Posted September 19, 2008 It has had a rebore and piston, part throttle and she picks up again. I've checked, and altered, the float height, it's running the correct 88 main jet, but just won't have it. Do any of you guys know what may be the cause ? Hope someone out there can shed some light. yeh make sure the old oilfeed pipe [from pump ] is blanked off properly . & when running in [rebored] make the twostoke mix alittle richer .[ plenty lube] say 30/1 or 25/1 ......... Roger. Link to comment Share on other sites More sharing options...
racerd Posted September 20, 2008 Share Posted September 20, 2008 yeh make sure the old oilfeed pipe [from pump ] is blanked off properly . & when running in [rebored] make the twostoke mix alittle richer .[ plenty lube] say 30/1 or 25/1 ........ why would you need to run 30 to 1 or 25 to 1 when running in to much oil ratio and the motor will not run in right but this depends on the make of 2 stroke oil being used run my motor in at 50 to 1 Link to comment Share on other sites More sharing options...
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