Author Topic: MX400B  (Read 6139 times)

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Offline Carey W

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MX400B
« on: June 29, 2016, 08:38:59 PM »
I recently posted in the introductions section and will share a resto I'm doing on a MX400B. It looked a bit rough as the paint came off it when it was washed but all bearings, brakes, cables ect are in great condition. The bike sat covered with a tarp for 36 years until 4 weeks ago.
I'm after a silencer and sprocket cover / case for it if anyone can help, I will post photos of the resto and bike here so please feel free to offer help or advice.

The plastics are very chalky and I think beyond repair. Are the plastics from http://www.vmxunlimited.com/categories/Yamaha/MX/Plastics/ good quality reproductions or is there a better / cheaper option.

As she was when I picked it up.



Brakes as they were after 36 years.

« Last Edit: June 29, 2016, 08:48:11 PM by Carey W »

Offline Carey W

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Re: MX400B
« Reply #1 on: June 29, 2016, 08:53:36 PM »
every bolt off to the cad platers along with a few parts not in the pic.


Engine ready to go back in the frame.




Offline Carey W

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Re: MX400B
« Reply #2 on: June 29, 2016, 08:58:27 PM »
Unfortunately the rims will be replaced with new did dirt stars due to a crack in the rear one. Probably happened 41 years ago in this race! It's bike #171.



HeavenVMX

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Re: MX400B
« Reply #3 on: June 29, 2016, 09:57:17 PM »
Unfortunately mate VMXUNLIMITED is no more. Les has retired to rest 8) and the very best wishes to him for a long and happy retirement.

Prime8 Racing is now the go. They also have a great WEB page, excellent service and support the VMX / Vinduro community.

http://www.prime8racing.com.au/

Those MX400B engines are FAST!

NOTED: Can not believe that the guy in the second last picture riding the Montesa has the make misspelt on his jersey MONTESSA  ::) WTF
« Last Edit: June 29, 2016, 10:01:57 PM by HeavenVMX »

Offline Carey W

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Re: MX400B
« Reply #4 on: June 30, 2016, 08:14:23 PM »
Good spotting on the Montessa thing, his style looks ok though. Maybe his wife or mum got it wrong!

Offline 80-85 husky

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Re: MX400B
« Reply #5 on: June 30, 2016, 09:43:46 PM »
its great to do up an old bike and find its new inside.

Offline Carey W

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Re: MX400B
« Reply #6 on: July 05, 2016, 07:25:03 PM »
A couple of rainy weekends helped to speed things up, still after a sprocket case if anyone can help.











« Last Edit: July 05, 2016, 08:41:29 PM by Carey W »



Offline Rossvickicampbell

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Re: MX400B
« Reply #9 on: July 06, 2016, 10:43:16 AM »
If you wish to race it have a look at the combined clutch and sprocket cover from John Tate - think they will fit the 400 also.  If you are interested I have a NOS air box for this model.

Cheers
1974 Yamaha YZ360B
1980 Honda CR250R - Moto X Fox Replica

Offline Freakshow

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Re: MX400B
« Reply #10 on: July 06, 2016, 12:14:33 PM »
how much for the airbox Ross ? or the used one of this one if he wants it :)
74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Offline Carey W

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Re: MX400B
« Reply #11 on: July 07, 2016, 06:10:16 PM »
Put the pipe back on today and started it up again, started 1st kick.







http://vid1177.photobucket.com/albums/x341/noturbo/Mx400b/IMG_0768.mp4



Offline Carey W

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Re: MX400B
« Reply #12 on: July 07, 2016, 06:47:11 PM »
Anyone know how to soften the original seat cover? As you can see the creases show up and it leaves creases when you get off the seat.

Offline Rossvickicampbell

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Re: MX400B
« Reply #13 on: July 08, 2016, 10:28:31 AM »
not much Freaky - $125 - just the body though remember.
1974 Yamaha YZ360B
1980 Honda CR250R - Moto X Fox Replica

Offline Tomas

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Re: MX400B
« Reply #14 on: July 08, 2016, 11:56:46 AM »
park it outside on a hot sunny day. hot sun will soften the old vinyl  :)

Offline Carey W

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Re: MX400B
« Reply #15 on: July 21, 2016, 09:54:38 PM »

Offline 80-85 husky

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Re: MX400B
« Reply #16 on: July 21, 2016, 09:59:08 PM »
it looks sensational....you ever ridden one?

Offline Carey W

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Re: MX400B
« Reply #17 on: July 21, 2016, 10:06:30 PM »
it looks sensational....you ever ridden one?

Only this one 2 weeks ago! They go alright.


Offline 80-85 husky

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Re: MX400B
« Reply #18 on: July 21, 2016, 10:25:15 PM »
I only ask as I rode one years ago and concluded as you did that:1. they go allright. 2. pretty much everything else is marginal. brakes are ok. but turning, bumps and "using" all that power was difficult to say the least. they are a stunning beast to open up but make sure its pointed in the right direction and that there aren't two many bumps in front of you. :o

Offline Rossvickicampbell

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Re: MX400B
« Reply #19 on: July 22, 2016, 09:47:32 AM »
rear suspension can be easily improved with a Works Performance shock.
1974 Yamaha YZ360B
1980 Honda CR250R - Moto X Fox Replica

HeavenVMX

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Re: MX400B
« Reply #20 on: July 22, 2016, 11:08:29 AM »
A Pre78 dirt track weapon ;)

Offline cckane

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Re: MX400B
« Reply #21 on: July 22, 2016, 06:35:45 PM »
Hi took a Montesa  expert to spot the spelling error I blame the USA company, it was a custom shirt cost $$$$ back then had to wear it to justify all the cost and postage that was practice the correct spelling logo ect was used in the race great to see the 28 '' waistline again

Offline Berwick Boy

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Re: MX400B
« Reply #22 on: July 22, 2016, 07:27:28 PM »
Would you identify yourself please, Montessa?
Seen this pic dozens of times over the years   .... yet never knowing who the guy on left was   :)

Offline Carey W

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Re: MX400B
« Reply #23 on: July 22, 2016, 08:56:32 PM »
Hi took a Montesa  expert to spot the spelling error I blame the USA company, it was a custom shirt cost $$$$ back then had to wear it to justify all the cost and postage that was practice the correct spelling logo ect was used in the race great to see the 28 '' waistline again

I'd have to go back to 1988 for size 28 pants, below a few pics from those days.



Mr Montessa if you know Kevin Brennan #171 in the pic please pm me your number. Will pass it on to Kevin,  Kevin will ride this mx400 again this weekend for the 1st time in over 35 years wearing his original gear! Can't wait to get some photos.
« Last Edit: July 22, 2016, 09:27:01 PM by Carey W »

Offline Carey W

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Re: MX400B
« Reply #24 on: July 22, 2016, 09:09:05 PM »
Fast forward to my 450 8)

Offline Berwick Boy

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Re: MX400B
« Reply #25 on: July 23, 2016, 10:06:40 AM »
Hi Carey and Montessa,
Carey ... would you be able to direct Kevin 171 to this Facebook group please?  It's a series of about 30 photo albums from MX days 1970s in Victoria.
About 800 pix loaded so far ... they are unearthed photos from Stoneys Photos archive.
Each album carries about 20 to 100 photos of a specific event.  Includes short circuit as well.
It's also an avenue to reconnect with several Victorian racers from those years - who are following the Facebook group.
Cheers Carey

Here is link:
https://www.facebook.com/groups/194446267585877/?ref=bookmarks

Or - search 'Motocross - 1970s Vic' in Facebook
« Last Edit: July 23, 2016, 10:08:33 AM by Berwick Boy »

Offline Carey W

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Re: MX400B
« Reply #26 on: August 20, 2016, 05:31:48 PM »
Took it out for a ride today. Here's a couple of pics.



Offline 80-85 husky

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Re: MX400B
« Reply #27 on: August 20, 2016, 07:31:53 PM »
fabulous bike...don't ride it for christs sake..put it on the pool table

Offline Carey W

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Re: MX400B
« Reply #28 on: August 21, 2016, 07:38:54 PM »
Here's a few better pics, I have new side plate stickers and need to replace the rubber under the seat with some thinner rubber so it doesn't rip.






Offline Carey W

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Re: MX400B
« Reply #29 on: August 21, 2016, 08:43:14 PM »

Offline 80-85 husky

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Re: MX400B
« Reply #30 on: August 22, 2016, 08:02:23 AM »
nice..don't you love that big curly throttle cable..just waiting for the first bit of foliage to yank her on to full blast... ;D  .

it looks fantastic

Offline Carey W

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Re: MX400B
« Reply #31 on: August 23, 2016, 06:20:54 PM »
Anyone know what torque to do the flywheel nut up to?

Offline Carey W

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Re: MX400B
« Reply #32 on: September 01, 2016, 09:40:24 PM »
Made a new silencer on the weekend as the modified DT one was restricting it too much, it doesn't look as original but sounds better. Still looking for a stock one if anyone has one they want to part with. http://s1177.photobucket.com/user/noturbo/media/IMG_0868.mp4.html

Offline Carey W

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Re: MX400B
« Reply #33 on: September 03, 2016, 03:13:24 PM »
Kevin came out today and rode the old girl, I think he would still have the smile on his face. He was not afraid to twist the grip either. Video's below and turn up the volume!


http://vid1177.photobucket.com/albums/x341/noturbo/Mx400b/IMG_0879.mp4
http://vid1177.photobucket.com/albums/x341/noturbo/Mx400b/IMG_0880.mp4
« Last Edit: September 03, 2016, 04:17:19 PM by Carey W »

Offline Carey W

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Re: MX400B
« Reply #34 on: September 06, 2016, 06:58:06 PM »
Guys how do you embed photo bucket videos

Offline Carey W

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Re: MX400B
« Reply #35 on: September 08, 2016, 09:43:11 PM »
41 year old 400 taking it to a injected kx450 and a ktm450exc

http://vid1177.photobucket.com/albums/x341/noturbo/Mx400b/IMG_0888.mp4

Offline 80-85 husky

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Re: MX400B
« Reply #36 on: September 09, 2016, 07:32:33 AM »
if youd got a better start you would have smoked em big time ;D

the 400 husky gives it to the new four bangers as well (when the clutch isn't slipping :-[)