Posted July 21, 201113 yr Just finnished restoring my DT and cant get it running right. Took it into the shop and had it back twice and its still poo. He said it was too rich as when he took the air filter panel and filter off it run much better. Then lowered the jet to 90. It wont rev out or idle for long. 40mph tops. Think i will have to sell as is if i cant get it sorted asap as going through divorce and may need the cash. Cost me £100 in the shop and it aint got me anywhere.
July 21, 201113 yr Moderator Hi Clive, makes me wonder if you have a carb from a later bike marked 3U500 fitted to an early bike with access to the air filter on the right of the bike ??? That would do it! People advetise carbs on ebay ***DT175MX CARB*** what they often fail to say, probably because they dont know...is the id number on the carb. The two carbs are jetted differently and more importantly have different throttle slides. This was because of a revised air filter box on the later bikes, notably the ones with a square sect swing arm.
July 21, 201113 yr Author On 7/21/2011 at 8:16 AM, oldgitonabike said: Hi Clive, makes me wonder if you have a carb from a later bike marked 3U500 fitted to an early bike with access to the air filter on the right of the bike ??? That would do it! People advetise carbs on ebay ***DT175MX CARB*** what they often fail to say, probably because they dont know...is the id number on the carb. The two carbs are jetted differently and more importantly have different throttle slides. This was because of a revised air filter box on the later bikes, notably the ones with a square sect swing arm. What should mine be then m8y. Was going to purchase a replacement carb of ebay for a dt175mx but as you have pointed out it may be wrong model 2H500 - Made by RT. Mines a round tube rear swing arm. At work at the moment so cant look but i dont recall seeing the number very clearly as it was vapour blasted. Will look later. Do you know the correct model for my bike?
July 21, 201113 yr Moderator On 7/21/2011 at 9:40 AM, clivew1965 said: What should mine be then m8y. Was going to purchase a replacement carb of ebay for a dt175mx but as you have pointed out it may be wrong model 2H500 - Made by RT. Mines a round tube rear swing arm. At work at the moment so cant look but i dont recall seeing the number very clearly as it was vapour blasted. Will look later. Do you know the correct model for my bike? Yours should be 2H500 Clive, if it has a 3U500 fitted that's your problem. You are seriously risking major damage with large throttle openings and only a 90 jet fitted! I would prefer to buy a used carb Mikuni rather than a copy RT?? will be much cheaper too £30 - £40 I would say This is what you need These are the spec's your carb should have Mikuni VM24SS, Number 2H500 Standard Set up with factory porting, standard exhaust and air filter Throttle Slide cutaway, 2.0 Needle, 4j13 Clip position 3 from top Needle Jet, 249 0-2 Main Jet, 130 Pilot Jet, 25 Reed side diameter, 35mm Filter side diameter, 43mm Length, 85mm Float Height, 21mm
July 21, 201113 yr Author On 7/21/2011 at 9:46 AM, oldgitonabike said: Yours should be 2H500 Clive, if it has a 3U500 fitted that's your problem. You are seriously risking major damage with large throttle openings and only a 90 jet fitted! I would prefer to buy a used carb Mikuni rather than a copy RT?? will be much cheaper too £30 - £40 I would say This is what you need These are the spec's your carb should have Mikuni VM24SS, Number 2H500 Standard Set up with factory porting, standard exhaust and air filter Throttle Slide cutaway, 2.0 Needle, 4j13 Clip position 3 from top Needle Jet, 249 0-2 Main Jet, 130 Pilot Jet, 25 Reed side diameter, 35mm Filter side diameter, 43mm Length, 85mm Float Height, 21mm Cheers m8y. Will let you know later. Apart from this problem the bike looks great. will take a few pics later. That said i still think i will have to part with it. Nightmare!! Hopefully i will get a decent price.
July 21, 201113 yr Moderator On 7/21/2011 at 9:57 AM, clivew1965 said: ....... That said i still think i will have to part with it. Nightmare!! Hopefully i will get a decent price. Sorry to hear that Clive
July 21, 201113 yr Author On 7/21/2011 at 10:18 AM, oldgitonabike said: Sorry to hear that Clive Will try and hold onto it but if you have been through divorce you know what i mean!!!
July 21, 201113 yr Author On 7/21/2011 at 2:19 PM, clivew1965 said: Will try and hold onto it but if you have been through divorce you know what i mean!!! Ok so i have the correct carb. Wish it wasnt to be honest so i could try and sort?
July 21, 201113 yr Moderator On 7/21/2011 at 6:15 PM, clivew1965 said: Ok so i have the correct carb. Wish it wasnt to be honest so i could try and sort? OK Clive you should have a good look at the components or the carb then, make sure they match the spec I listed...everything...including the slide cutaway
July 22, 201113 yr Author On 7/21/2011 at 11:40 PM, oldgitonabike said: OK Clive you should have a good look at the components or the carb then, make sure they match the spec I listed...everything...including the slide cutaway Will check in sat morning m8y as at work.
July 28, 201113 yr Author On 7/23/2011 at 10:27 AM, clivew1965 said: Just need to get the beuty running right Still not runing right, new carb fitted all standard. It starts but smokes alot and stinks of fuel. Havent managed to get it ticking over yeat. Just seams gutless when you rev it. Spluttery not crisp.
August 11, 201113 yr Author On 7/28/2011 at 11:14 AM, clivew1965 said: Still not runing right, new carb fitted all standard. It starts but smokes alot and stinks of fuel. Havent managed to get it ticking over yeat. Just seams gutless when you rev it. Spluttery not crisp. Anyone local to me who knows what there doing and can sort this for me and earn a few quid?
August 11, 201113 yr Moderator On 8/11/2011 at 7:00 PM, clivew1965 said: Anyone local to me who knows what there doing and can sort this for me and earn a few quid? Clive it would help if you fill in your profile, It's no use asking if anyone is local and not saying where you are! If it comes to it...I could post you yet another carb to try. or we could take it through the forum and you examine your carb and see if all the components and settings are as they should be. I already posted the details of this earlier
August 11, 201113 yr Author On 8/11/2011 at 7:19 PM, oldgitonabike said: Clive it would help if you fill in your profile, It's no use asking if anyone is local and not saying where you are! If it comes to it...I could post you yet another carb to try. or we could take it through the forum and you examine your carb and see if all the components and settings are as they should be. I already posted the details of this earlier The carb is totally new so all standard. Stressed at mo Bloody divoce crap!!
August 11, 201113 yr Moderator On 8/11/2011 at 7:25 PM, clivew1965 said: The carb is totally new so all standard. Stressed at mo Bloody divoce crap!! Totally new but a genuine one or re-produced?
August 11, 201113 yr Author On 8/11/2011 at 7:30 PM, oldgitonabike said: Totally new but a genuine one or re-produced? no not genuine. reproduced m8. Think its just the stting up of the bike if im honest and i dont have a clue regarding that. If it aint that it has to be crank seals? Paid once to get it sorted in the shop but they were crap so not paying them anymore. but will pay to get sorted by someone who knows what thee doing.
August 11, 201113 yr Moderator On 8/11/2011 at 7:51 PM, clivew1965 said: no not genuine. reproduced m8. Think its just the stting up of the bike if im honest and i dont have a clue regarding that. If it aint that it has to be crank seals? Theres a quick and easy test for crank seals I wouldnt have trusted the repro carb though Left crankseal would be prone to suck air and run lean and hard to start, right seal would be prone to burn transmission oil and be rough running and smoky
August 13, 201113 yr Looking at the crank on the clutch side, does anyone know the size of the o-ring between the bearing and gear spacer?
August 19, 201113 yr On 7/28/2011 at 11:14 AM, clivew1965 said: Still not runing right, new carb fitted all standard. It starts but smokes alot and stinks of fuel. Havent managed to get it ticking over yeat. Just seams gutless when you rev it. Spluttery not crisp. Clive: Try to install a #25 pilot jet and #150 main jet. This solved my exact same problem m8.
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