burton500 Posted August 9, 2011 Share Posted August 9, 2011 Hi I've got a 1981 DT175MX. The carb on it, which I believe to be original, is model no 2H501. My Haynes manual has the spec for a 2h500, but not the 2H501. What I'm trying to confirm is the correct main jet for this particular carb. The bike came with a 170 fitted, and I reckon that's too rich - the bike struggles to get through 6000, but once through 6000, it takes off. Depending on what you read, it seems 130 or 160 are possible std sizes. Obviously once the main is sorted I can then fine tune the needle setting. Anyone able to help? Many thanks Lee Link to comment Share on other sites More sharing options...
jebb Posted August 9, 2011 Share Posted August 9, 2011 Hi I've got a 1981 DT175MX. The carb on it, which I believe to be original, is model no 2H501. My Haynes manual has the spec for a 2h500, but not the 2H501. What I'm trying to confirm is the correct main jet for this particular carb. The bike came with a 170 fitted, and I reckon that's too rich - the bike struggles to get through 6000, but once through 6000, it takes off. Depending on what you read, it seems 130 or 160 are possible std sizes. Obviously once the main is sorted I can then fine tune the needle setting. Anyone able to help? Many thanks Lee Hi, I wouldn't worry too much about what is supposed to be the right jet size- do a plug chop and decrease as necessary. My own Lemon should be running (according to Mr. Haynes) a 160, but even with a full gianelli system it still is a bit rich with a 140. Trial and error I suppose Cheers Link to comment Share on other sites More sharing options...
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