missing a part

natron23 · August 27th, 2008, 04:43 AM

I have this same little bike but mine isn't running and is missing some parts. I need to know what the little cylinder shaped black thing just behind the kickstarter?

http://i2.ebayimg.com/01/i/001/07/97/7900_1.JPG

tigger · August 27th, 2008, 05:27 AM

What is that then, a 70-73 Yamaha MX250? I'm not sure exactly, I've got a '74 DT250, and all I've got there is the airbox. What's it connected to?

bone · August 27th, 2008, 11:55 AM

Quote:

Originally Posted by natron23

I have this same little bike but mine isn't running and is missing some parts. I need to know what the little cylinder shaped black thing just behind the kickstarter?

sensor for brakelight?

hansvonaxion · August 27th, 2008, 01:42 PM

Is there a bike shop anywhere near you?
Get them to pull out the microfisch (sp?).

natron23 · August 27th, 2008, 04:48 PM

k thanks,
it's a 73 dt 250
my guess was that it's something electrical

also, the guy i bought the bike from took the carb apart and when I got it it wasn't all there. seems like it would be more expensive to overhal/rebuild the carb than to buy a new mikuni. Would there be any issues if put in a new round slide carb with close valve and jet sizes?

hansvonaxion · August 28th, 2008, 02:43 AM

I think bone might be right. I did a quick pic search cos the one at top is so small and all the bike I checked didn't seem to have one, though.

I don't think there'll be a problem with swapping the carb, people do it all the time. You might get better info from a bike specific forum, you could probably find a DT specific forum.

bone · August 28th, 2008, 11:32 AM

Quote:

Originally Posted by natron23

k thanks,
it's a 73 dt 250
my guess was that it's something electrical

also, the guy i bought the bike from took the carb apart and when I got it it wasn't all there. seems like it would be more expensive to overhal/rebuild the carb than to buy a new mikuni. Would there be any issues if put in a new round slide carb with close valve and jet sizes?

if you have to buy a new carb, don't buy mukini
dell'orto FTW! A LOT easier to jet than mukini
and if you can, get a flat-slide carb, they give better, more direct power

tigger · August 28th, 2008, 08:00 PM

Quote:

Originally Posted by natron23

also, the guy i bought the bike from took the carb apart and when I got it it wasn't all there. seems like it would be more expensive to overhal/rebuild the carb than to buy a new mikuni. Would there be any issues if put in a new round slide carb with close valve and jet sizes?

My carb is a little leaky, are the rebuild kits really that expensive?

bone · August 29th, 2008, 11:37 AM

^depends of what you need, a simple gasket doesn't cost that much, but if you are missing parts, it might get expensive

float, needle, jets, ... can cost quite a bit

but a new carb is expensive as well, don't know what would be the cheapest

natron23 · August 29th, 2008, 04:29 PM

i found the problem, frozen valve slide. loosened it up and ordered a rebuild kit off ebay for $18 to replace jets, gaskets and the missing throttle valve spring. where do i connect the small lines pictured?

http://i7.ebayimg.com/07/i/000/98/d0/dc68_1.JPG

tigger · August 30th, 2008, 07:57 AM

Quote:

Originally Posted by natron23

i found the problem, frozen valve slide. loosened it up and ordered a rebuild kit off ebay for $18 to replace jets, gaskets and the missing throttle valve spring. where do i connect the small lines pictured?

With the exception of the line to the gas tank, the other line on mine seems to just be for bowl overflow.

bone · September 1st, 2008, 12:05 PM

^yep, one for if your float gets stuck, it just starts pissing petrol, untill you gastank is empty

the other one is for if you're on your side, so your gastank can drain as well

never actually understood the use, i prefer the petrol to stay IN the gastank - even when i'm on my side

August 27th, 2008, 04:43 AM	#1
natron23 Joined: Aug 27th, 2008 Last Online: August 30th, 2008 Posts: 3 Rep Power: 0	missing a part I have this same little bike but mine isn't running and is missing some parts. I need to know what the little cylinder shaped black thing just behind the kickstarter? Last edited by Viper007Bond; August 27th, 2008 at 05:41 AM.. Reason: Line break

August 27th, 2008, 01:42 PM	#4
hansvonaxion Joined: Apr 8th, 2005 Last Online: 07:09 AM Posts: 1,084 Rep Power: 29	Is there a bike shop anywhere near you? Get them to pull out the microfisch (sp?). __________________

August 28th, 2008, 02:43 AM	#6
hansvonaxion Joined: Apr 8th, 2005 Last Online: 07:09 AM Posts: 1,084 Rep Power: 29	I think bone might be right. I did a quick pic search cos the one at top is so small and all the bike I checked didn't seem to have one, though. I don't think there'll be a problem with swapping the carb, people do it all the time. You might get better info from a bike specific forum, you could probably find a DT specific forum. __________________

August 29th, 2008, 11:37 AM	#9
bone "bangle for president" Joined: Jan 14th, 2004 Last Online: November 27th, 2008 Location: belgium!! Age: 24 Posts: 6,069 Car: yamaha banshee (and an opel astra from work) Rep Power: 28	^depends of what you need, a simple gasket doesn't cost that much, but if you are missing parts, it might get expensive float, needle, jets, ... can cost quite a bit but a new carb is expensive as well, don't know what would be the cheapest __________________ groups/artists i've seen live: coldplay, the cure, cypress hill, damian marley, deftones, depeche mode, dEUS, franz ferdinand, grandaddy, guns n' roses, interpol, jamiroquai, korn, lenny kravits, marilyn manson, massive attack, metallica, moby, muse, the pixies, placebo, prodigy, queens of the stone age, the raconteurs, radiohead, red hot chili peppers, REM, skin, tool, the who, Wu-Tang and so many more...

September 1st, 2008, 12:05 PM	#12
bone "bangle for president" Joined: Jan 14th, 2004 Last Online: November 27th, 2008 Location: belgium!! Age: 24 Posts: 6,069 Car: yamaha banshee (and an opel astra from work) Rep Power: 28	^yep, one for if your float gets stuck, it just starts pissing petrol, untill you gastank is empty the other one is for if you're on your side, so your gastank can drain as well never actually understood the use, i prefer the petrol to stay IN the gastank - even when i'm on my side __________________ groups/artists i've seen live: coldplay, the cure, cypress hill, damian marley, deftones, depeche mode, dEUS, franz ferdinand, grandaddy, guns n' roses, interpol, jamiroquai, korn, lenny kravits, marilyn manson, massive attack, metallica, moby, muse, the pixies, placebo, prodigy, queens of the stone age, the raconteurs, radiohead, red hot chili peppers, REM, skin, tool, the who, Wu-Tang and so many more...

August 27th, 2008, 05:27 AM	#2
tigger Joined: Dec 11th, 2006 Last Online: 07:05 AM Location: Manhattan, Kansas Posts: 2,321 Car: '78 Ford, '74 Yamaha, '74 Honda Rep Power: 26	What is that then, a 70-73 Yamaha MX250? I'm not sure exactly, I've got a '74 DT250, and all I've got there is the airbox. What's it connected to?

August 27th, 2008, 04:48 PM	#5
natron23 Joined: Aug 27th, 2008 Last Online: August 30th, 2008 Posts: 3 Rep Power: 0	k thanks, it's a 73 dt 250 my guess was that it's something electrical also, the guy i bought the bike from took the carb apart and when I got it it wasn't all there. seems like it would be more expensive to overhal/rebuild the carb than to buy a new mikuni. Would there be any issues if put in a new round slide carb with close valve and jet sizes?

August 29th, 2008, 04:29 PM	#10
natron23 Joined: Aug 27th, 2008 Last Online: August 30th, 2008 Posts: 3 Rep Power: 0	i found the problem, frozen valve slide. loosened it up and ordered a rebuild kit off ebay for $18 to replace jets, gaskets and the missing throttle valve spring. where do i connect the small lines pictured?

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