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Jon Stewart

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About Jon Stewart

  1. Jon Stewart

    12v conversion help needed

    Has anyone managed a 6v to 12v conversion without adding a battery (kick start only)? I want to get a fatter spark on mine but I don't want to add a battery - I've replaced the coil and plug- and I was hoping to use the stator and ecu from my gn250 but it only has one pickup from the stator housing and 3 yellow wires from the 18 windings which are the generated a.c. voltage. My Dr has 2 pickups in the housing, 3 yellow wires from 15 of the windings and 2 desperate windings which have 2 wires which go straight to the ecu. I guessing the two wire which go straight to the ecu on the Dr are something to do with the ignition coil voltage? Pic one is Dr, pic two is gn
  2. Jon Stewart

    Gas in the oil question

    Yeah it confused me because the volume of oil was only about 0.25 litre more than it should be so I can't understand why so much of it came out of the side. When I've had that bung out before I've only had a trickle of oil from there. For that much oil to come out of the side I would have expected to see a total volume of gas/oil mix of around 3.5 litres
  3. Jon Stewart

    Gas in the oil question

    I thought there was only supposed to be a small dribble from out of the side case bung (the hole you put the socket in to rotate the engine). I don't understand how so much came out of there but only half a litre came out of the sump. Surely it should have mostly drained to the bottom of the engine?
  4. Jon Stewart

    Gas in the oil question

    I got the other 0.5lt out of the 14mm sump bolt in the bottom of the engine just behind the sump guard. That's the drain point, right?
  5. Jon Stewart

    Gas in the oil question

    Ok guys, a little background: it's a 1992 dr250, kick start only, running a bst33 carb. It's a bit of a bitch to start and takes a lot of kicking. The jetting is all good (perfect colour on the colourtune kit). Lately it got harder to start so I thought I'd check valve clearances again. I Pulled the small bung out of the left hand side to turn the engine to TDC and about 1.5 litres of thin, gassy smelling oil came out! I had cleaned and rebuilt the carb recently with a kit and installed new float needle, seat and o-rings so I Pulled it all apart again and checked everything. It all looked good though. I hooked the carb up to the tank on my bench and left the fuel on for an hour but had no leaks anywhere from the carb. When I dropped the remaining oil from the sump it was approx half a litre but it wasnt thin and it didnt smell of gas. Can anyone explain to me what's going on?? Two main questions: 1 I always turn the fuel off when parked so how dud it get fuel in the oil? Could it somehow be getting in there while I'm kicking it over trying to start it? 2 How come the oil in the sump didn't seem to have mixed with the gassy oil that came out of the case? Thanks - Jon
  6. Jon Stewart

    i cant find a efin 1998 dr250r owners manuel that i need to buy or for free

    If yours is the same I found that the bmw f650 has the same carb and ebay had loads of spares under that search rather than searching for a Dr carb spares kit
  7. Jon Stewart

    i cant find a efin 1998 dr250r owners manuel that i need to buy or for free

    My 1994 has a mikuni bst33 on it if that helps
  8. Jon Stewart

    Carb spares? BST33 Mikuni

    @plugeye, do you have a link?
  9. Jon Stewart

    Carb spares? BST33 Mikuni

    Anybody know where I can buy a brand new choke plunger for a mikuni BST33 CV Carb? The long brass shaft in the picture. EBay only seems to have the much shorter items.
  10. Jon Stewart

    1985 DR 250 12 volt conversion ( help! )

    It's not that easy mate lol. It's a 250 with a 350 front and rear end. The engine number points to a 1992 jap import djebel but the ecu and reg/rec do not match any models I can find anywhere online.
  11. Jon Stewart

    12v conversion on a 250

    Here's mine. Measuring the voltage going to the coil it rises with the rpms. If a standard kick is (for example) 2000rpm it would only generate around 4v. I was thinking that with a 12v system that same 2000rpm kick would generate a lot more volts due to the increased number of windings on the stator. Or am I getting this wrong?
  12. Jon Stewart

    1985 DR 250 12 volt conversion ( help! )

    Bobgarty, I might need to tap into your knowledge soon mate. I'm UK based too (suffolk) and in contemplating whether a 12v conversion will make my 1992 (ish) jap import djebel (probably) easier to start. Ive got a gn250 engine in the shed...
  13. Jon Stewart

    12v conversion on a 250

    Alternator? It doesn't have a battery. Do you mean the stator? I've cleaned that. My thinking is this: if it's only 3v on idle (which is probably kickover rpm unless i take a flying leap at the thing), a 12v system should put out a higher voltage at tickover (more windings on each core at the same rpm). More voltage = bigger spark, yes?
  14. Jon Stewart

    12v conversion on a 250

    I've been tarting up an old 92(ish) dr250 and it's still a sod to start. Weak spark. I've got the jetting sorted using a colourtune kit and rebuilt the carb and cleaned the stator but it's still difficult to start even with a new plug and upgraded coil. It has no battery, Kick start only, and I've made my own very simple loom from scratch but I'm still only getting 2.6v on idle rising to 6v when revved. Tucked away in the corner of the workshop is an old gn250 project bike. I was thinking of ripping the stator out of that and bunging it in the DR along with the ecu and reg/rec. Would i be correct in thinking that the windings on the GN stator would be different, thus giving me 12v and a fatter spark? If so would that potentially make it easier to start? Anyone tried this? Thanks - Jon
  15. Jon Stewart

    1992 DR250 Won't Start

    So there you have it. 2 answers that totally contradict each other. The correct answer is yes. (Well according to the Clymer manual anyway)
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