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Makotosun

Cylinder jug, I,D. ?

  • Blackhat250
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Cylinder jug, I,D. ? was created by Blackhat250

I inherited a jug , [ its 397cc] its stamped 50000 on the other side [ where the Usual 1M2 etc is] the reed block orifice is much larger than the DT400,


what model is this off,
If you aint mixin gas " you aint haulin Ass
01 Jan 2016 14:52 #1

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Replied by RT325 on topic Cylinder jug, I,D. ?

guessing MX400B. Found a similar question just by googling & guy said his was 87mm i think which is 400 plus 1mm oversize. That'll make a quick DT if you squeezed some extra compression out of it--well-- plus pipe & carb & reed block & [where was i lol] Cheers if i'm right--never mind if i'm wrong. Someone will know for sure.
01 Jan 2016 16:07 #2

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Replied by Blackhat250 on topic Cylinder jug, I,D. ?

Superb , its a bit scabby , the reed block& boot are there too .

If you aint mixin gas " you aint haulin Ass
01 Jan 2016 16:20 #3

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Replied by Enduronut on topic Cylinder jug, I,D. ?

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It's a 75/76 DT400 Enduro cylinder

Stock / standard bore size is 85mm

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Last edit: 01 Jan 2016 16:26 by Enduronut.
01 Jan 2016 16:25 #4

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Replied by RT325 on topic Cylinder jug, I,D. ?



Quite right, 400's are 85mm std not 86mm [senior moment-again]. Think my yz490 is 87mm without looking.
Last edit: 02 Jan 2016 08:46 by Enduronut.
01 Jan 2016 22:26 #5

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Replied by Blackhat250 on topic Cylinder jug, I,D. ?

Its on 85mm. [standard bore] porting is more aggressive than my DT400 Jug & that inlet is massive compared to the DT jug, Mx400 then .
they are the same height , [ left barrel in picky is sunk into cushion, ].
If you aint mixin gas " you aint haulin Ass
Last edit: 02 Jan 2016 04:38 by Blackhat250.
02 Jan 2016 04:36 #6

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Replied by Devin on topic Cylinder jug, I,D. ?

Sorry.....its not an MX400, its a 75-76 DT400B/C (as Enduronut mentioned). The ports are more aggressive on the 75-76 DT400 B/C compared to the 77-78 DT400 D/E (likely due to EPA cracking down in the later years). The 75 MX400B has even more radial porting. I hope it helps.




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Last edit: 02 Jan 2016 05:24 by Devin.
02 Jan 2016 05:15 #7

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Replied by Enduronut on topic Cylinder jug, I,D. ?

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Thanks for the pictures Devin.
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Control your thoughts . . . or your thoughts will control you!.!
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Last edit: 02 Jan 2016 09:27 by Enduronut.
02 Jan 2016 09:24 #8

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Replied by FrankC on topic Cylinder jug, I,D. ?

I have heard 75- 76 DT400 are supposed to put out 5 more ponies than the 77-78?
02 Jan 2016 10:44 #9

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Replied by Blackhat250 on topic Cylinder jug, I,D. ?

Good call " :likey ,, funny that, I had the twinskhock in 1979. and then the Monoshock in1980, and the 400b would wheelie no problem, The 400d never,[ even in 1st gear] I just thought the 400d was worn out,[ 3rd owner by then ]

Why did Yamaha down tune the Monoshocks? ,
If you aint mixin gas " you aint haulin Ass
02 Jan 2016 10:56 #10

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