Author Topic: DRM 400  (Read 46804 times)

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oldfart

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DRM 400
« on: October 30, 2007, 08:32:18 am »
Six months in the building and still going  :)


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oldfart

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Re: DRM 400
« Reply #1 on: October 30, 2007, 08:41:52 am »
RHS


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Doc

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Re: DRM 400
« Reply #2 on: October 30, 2007, 09:18:53 am »
Looking really good Stew!  ;) I meant to reply the other day when I got the pics in the mail 8) jealous of those wheels particularly!  :P

Offline pokey

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Re: DRM 400
« Reply #3 on: October 30, 2007, 10:20:57 am »
Did you start it on the weekend mate? Im sure i felt the earth move. ;D

 She has Connondale written all over her and is gonna thump.

Offline brent j

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Re: DRM 400
« Reply #4 on: October 30, 2007, 10:44:08 am »
OK so it doesn't say Yamaha on the tank but it's a fourstroke, a 500, a single and I love it!

I rode one in NZ and was very impressed

Brent
The older I get, the faster I was

mx250

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Re: DRM 400
« Reply #5 on: October 30, 2007, 12:59:43 pm »
Nice work.

Inspired by the VMX article???

Offline YZ250H

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Re: DRM 400
« Reply #6 on: October 30, 2007, 01:10:17 pm »
The photos don't really do her justice Oldfart.  She looks better in the flesh  8)  Certainly a credit to you.
Looking forward to a video of her in action.
Looking for YZ250C parts NOS if possible

"My inability to use emoticins in the right context is really getting me down :)
The only triple jumps he would have been doing are the hop, skip & jump.

Offline David Lahey

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Re: DRM 400
« Reply #7 on: October 31, 2007, 10:31:08 pm »
Oldfart
I have finally seen a thumper I really like. Probably because it is very much like mine!! I'm keen to see what sort of exhaust you end up with.
Mine is a little bit different to yours as the frame is made from joining the rear section from an RM250C1 to the engine frame section of an SP370. The geometry looks very much like yours which I'm guessing is a DR400 frame with an RM swingarm.
I'm using the RM250C1 forks, (aluminium) fuel tank and steel swingarm and some Marzocchi piggyback shocks. The SP370 motor was big bored to take a DR400 piston and has a 36mm Dell Orto pumper and a custom exhaust. Standard compression, valves and cam timing. I'm using the RM rear wheel and can't decide if the RM or SP front wheel is the best.
I built it in 1979 from a brand new SP370 and an RM with a blown motor. It was my enduro weapon for many years and then I used it for fitness training on an MX track in the mid 1990s (it's great for working up a sweat). It now patiently waits in the shed and gets ridden about twice a year.
David Lahey
Gladstone
previous pseudonym feetupfun

Offline crs-and-rms

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Re: DRM 400
« Reply #8 on: October 31, 2007, 11:11:21 pm »
looks great im not a fourstroke fan but id have that in my shed any day

oldfart

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Re: DRM 400
« Reply #9 on: November 01, 2007, 06:23:09 pm »
This weekend should see the rear brake Assembly finished along with the front brake cable .Undecided to which throttle type Um mm fiesta over it for another week .

OK the frame is definitely a DR 400 ( 1980 ) vintage     Tony recognize the old girl
Front forks from a Rm 250 N  (38 mm )  internal springs Honda 2 piece with Yss Pd valves
Rear shocks are DR 500 -1981    ex USA  Ebay Item \
Swing arm RM 250 -400 RM c2
Seat Rm 125 b and the same for the tank which was acquired thru Ebay USA for a song  $10 plus $20 shipping ( 8 weeks ) . The minor Dents where removed a per posting.......
To make the tank fit the frame new mounts had to be fabricated at the front and welded on - The rear was easy as the section that was removed to fix the dents in the tank was hand fabricated to suit

Tip ... I used plaster  cement to take a mould of the rear of frame - which became the plug - filled it up with molten lead ...then that became the  jig to fabricate the infill section of the tank .

All the unnecessary brackets where removed , new ones added for side covers - CDI  relocated - coil relocated - extra gussets welded up at steering head and all welds re done and cleaned up
Frame was sand blasted then acid dipped - one coat of base coat - 2 coats of 2 pack black

The motor was Stripped bead blasted and had a total rebuild - head rebuilt -ports worked and flow tested with good results  :) motor was 2 packed and assembled
Hmmmm  ... used a piece of armour flex ( black a/c lagging ) to get the clearance plus shape of exhaust ( exits to the right and over the clutch cover -under the air box -rise to clear wheel and exit LHS to match side cover

First attempt at making one at me  mates exhaust shop looked shit house .... so may have to bite the bullet and get one custom made ( $400 ) ouch
 
Tank colour will be Rm yellow with black SUZUKI stickers cleared over

Waiting patiently is a DR 500 ( 2008 resto )

PST     typing is not one of my choosen skills  ;D      wheres the kids when you need em  lol



« Last Edit: November 01, 2007, 06:25:17 pm by oldfart »

Offline Mutch

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Re: DRM 400
« Reply #10 on: November 04, 2007, 07:47:32 am »
Well that was one hell of an explanation Bro,The bike looks good.Pity about the tank though,oh and the kids how can they help, you are always hogging the computer anyway.

oldfart

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Re: DRM 400
« Reply #11 on: April 12, 2008, 02:33:44 pm »
 Here she is all finished in time to take to CD5

Offline pokey

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Re: DRM 400
« Reply #12 on: April 12, 2008, 04:20:14 pm »
Whats she ride like Stewy? Have the neighbors complained about the boom boom boom? ;D

oldfart

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Re: DRM 400
« Reply #13 on: April 12, 2008, 05:01:07 pm »
Pokey  ....awesome power in all gears, still sorting out the front end as there is no in between ( either too hard with XR springs or TOO soft with RM  springs ) looking for softer up spring as per BRENTs reply in another post .
As for the noise factor I reckon its a tad above the legal limit  ;)

Doc

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Re: DRM 400
« Reply #14 on: April 12, 2008, 05:38:47 pm »
Jeez Stew, she looks the good mate. Nice job!  8)