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Old 06-06-2013, 11:46 AM   #16
gloud
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Joined: Jun 2011
Location: Western mass USA
Oddometer: 158
Do the main seals unless they have been replaced in the last few years they are cheap and only take a few hours to do. it will save you $$$ in the end.
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Old 06-06-2013, 08:30 PM   #17
Imflyinn OP
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Joined: Apr 2013
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Got into the bike today, and I will replace the main seals for sure. The engine is in perfect shape but the carb is frozen. I have PB Blaster and WD-40 on it now, is there any way to get it unfrozen or will I need to buy a new one?
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Old 06-06-2013, 08:40 PM   #18
joexr
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If you can , pullit out so you can work on it. Will the top unscrew?
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Old 06-06-2013, 08:45 PM   #19
Imflyinn OP
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The top will unscrew but not come off completely
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Old 06-06-2013, 08:46 PM   #20
Imflyinn OP
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Right now it is only connected by the top piece. I took a piece of a clothes hanger and have the carb suspended upside down from the handle bars so hopefully the WD-40 will get in there
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Old 06-06-2013, 08:50 PM   #21
joexr
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You mean the top where the cable is?
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Old 06-06-2013, 08:52 PM   #22
Imflyinn OP
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Yes. It would probably come off if I forced it but did not want to take any chances
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Old 06-06-2013, 08:54 PM   #23
joexr
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Be very careful , the cast aluminun is brittle. Will the slide inside move up and down?
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Old 06-06-2013, 08:59 PM   #24
Imflyinn OP
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The slide is stuck closed and will not move at all
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Old 06-06-2013, 09:04 PM   #25
joexr
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If the slide is stuck , top is probably stuck worse. You could try a big pair of channellocks on the top , but you just don't want to squeeze it. Can push the slide up with your thumbs or twisting a big screwdriver under it?
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Old 06-06-2013, 09:06 PM   #26
Imflyinn OP
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I tried pushing it decently hard with a screwdriver, it's stuck really good and won't move at all
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Old 06-06-2013, 09:13 PM   #27
joexr
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It's all aluminum. I don't know what might soak it loose. Somebody else may have ideas tommorrow or maybe ask about it at a car or bike shop. I'll try to get back tommorrow.
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Old 06-06-2013, 09:24 PM   #28
Imflyinn OP
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I looked online and came up with a bunch of things to do, but they are all different. I can't get to the bike until tomorrow night so I'll let it soak until then and see what happens, hopefully it will be at least a little better!
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Old 06-07-2013, 01:54 PM   #29
joexr
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If you go to page 55 , post 816 of the 2-stroke picture thread , there's a pic of your bike.
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Old 06-07-2013, 05:40 PM   #30
motrhead
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Joined: Feb 2007
Location: Castlegar, BC, Canada
Oddometer: 22
I recently bought two 400 2 stroke Yamahas: I wanted the 78 IT400, and it came with a 78 DT400MX , which according to the list here is a DT400e:
http://www.merrittmotorcyclesalvage....tification.htm

I used spray carb cleaner to free up the stuck slide/piston in my IT carb. I kept spraying frequently (from top and bottom) to keep it wet for a while and to make sure it had time to soak thoroughly, and then carefully, and not *too* forcefully, put a flat blade screwdriver in each side and pried straight up with equal force on each side. If you do this be careful! You can mess up the piston quite easily. I really should have soaked the body in carb cleaner, but there was not a lot of obvious varnish in my carb, and it freed up quite quickly, but it did take a bit of force.
After cleaning out the sludge in the tank, lines and petcock, changing transmission oil and investing in a new iridium plug, it started third kick. I just swapped out the old fork oil for new 15 weight Belray, and I still have to invest in a new agressive knobbie, cause this thing just spins the tire through 4th gear. When it does hook up, I just hope I am pointed in the right direction 'cause I get there in a hurry, and it doesn't have a lot of brakes! LOL. I am having a blast on the IT, and hope to get started on resurrecting the DT soon.
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