Author Topic: Building a DRM 400  (Read 41324 times)

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Doc

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Re: Building a DRM 400
« Reply #75 on: December 22, 2008, 05:27:32 pm »
oldfart, that is a good tip for anyone looking at used '78 model RM swingarms in all capacities (excl. 80,60,50) they are indeed thin and do flog out at the slightest hint of bearing/bush wear :o when I was 16 I binned my then near new RM400 arm for this very reason..obviously in hindsight I was very silly yet again ::) I purchased a brand new item over the counter at near $180 from memory and then 5 years later it too became unusable. I tried to have it repaired by a local aluminium welding shop but that was a bigger mistake as they wrecked it even more :o I then switched to a '77 RM370 box section steel job and never had another problem for untold years ;D Only in the past 2 years have I found another 'affordable' 250c2 swingarm and refitted that but I'm keeping the steel item up my sleeve as a failsafe. PE250B also have basically the same arm as the 370 though not sure about shock positions. Bit of dribble but it does relate to the DRM as most go for the alloy '78 RM arms when there is little advantage excepting appearance. Problem with the PE arms is it's hard to find one not overly rusted out underneath at the rear. Depending on the rust severity this for my mind can be fixed easier than the alloy RM arm which will continue to need constant inspection. If someone offers up a 370 or PE250B item at the right price then it's a good asset to have up your sleeve when all else fails ;)

Offline NSR

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Re: Building a DRM 400
« Reply #76 on: January 17, 2010, 10:07:39 pm »
Nice DRM




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Offline NSR

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Re: Building a DRM 400
« Reply #77 on: January 17, 2010, 10:21:37 pm »
Some more


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Offline brent j

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Re: Building a DRM 400
« Reply #78 on: January 17, 2010, 10:31:02 pm »
I like the TM tank better than an RM one. Looks great
The older I get, the faster I was

Offline GMC

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Re: Building a DRM 400
« Reply #79 on: January 17, 2010, 10:35:24 pm »
The swingarm looks like a Hallman arm.
I was going to say the same for the frame until I saw a close up of the engine cradle.
Possibly a RM / PE frame with a Hallman swingarm from a HL
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Offline LWC82PE

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Re: Building a DRM 400
« Reply #80 on: January 17, 2010, 10:46:28 pm »
swing arm is RM or PE with the gussets cut.
Whos bike is it? i want one of those bar pads.
Wanted - 1978 TS185 frame or frame&motor. Frame # TS1852-24007 up to TS1852-39022

Offline brent j

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Re: Building a DRM 400
« Reply #81 on: January 17, 2010, 10:47:01 pm »
With the cutouts for the lower shock mounts I'd pick that swingarm as an RM item.

The whole bike looks well done. Not as good as a Yamaha tho............... ::)
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Offline NSR

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Re: Building a DRM 400
« Reply #82 on: January 17, 2010, 10:58:35 pm »
Started from this by the look.






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Offline NSR

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Re: Building a DRM 400
« Reply #83 on: January 17, 2010, 11:32:38 pm »
I also like this, but that could be just me :P
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Offline Jens

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Re: Building a DRM 400
« Reply #84 on: January 19, 2010, 06:08:50 am »
Very beutiful bike!

Jens
Full throttle!

Offline cloggy

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Re: Building a DRM 400
« Reply #85 on: January 20, 2010, 07:57:58 pm »
The DRM was built by Jean-Francois Helaine. It has a standard  engine with a 38mm carb, Jean Francois was kind enough to give me the jetting specs.
He used a RM rolling chassis with GN bottom rails  and Simons forks. He placed 7th overall at the Farleigh Castle 2 day international meet. When he got back to France he found he'd bent both wheel spindles on the Farleigh jumps!
The detailing is flawless. In real life it stands comparison with the very best UK restorations.
He'd like to pep the motor up but Megacycle seem unwilling to deal with a foreigner. I can get a cam sorted  using Ford springs but it's the dimensions of the keepers that is a problem

Offline Jens

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Re: Building a DRM 400
« Reply #86 on: January 21, 2010, 05:19:14 am »
Now we´re talking  ;D

Cloggy, my pinkie for those specs? Fair enough? Seriously I´d be truly grateful if I could partake in those jetting specs.

What´s this about Megacycle not doing affairs with foreigner? I was just gonna ordrer me a new cam next month  ??? They can´t be serious, can they?
Full throttle!

Offline cloggy

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Re: Building a DRM 400
« Reply #87 on: January 21, 2010, 06:26:07 am »
Well let's say foreign speaker. Whilst Jean-Francois's english is light years better than my french, it's not good enough for him to be sure of what he's ordering.

38 round slide Mikuni
Idle screw 3/4
Needle 6F16 middle clip
needle jet P8
3 slide
40 Idle jet
 250 main
Back in the day it was thought 36 was the optimum but I would have thought the above would be close even on a 36

I didn't check what sort of intake arrangement he was running but the exhaust was big bore and running into a megaphone. In other words a tuned system
I'm pretty sure he's ground off the intake weir but that's about it.
I can get a Protec "Road and Track" copy cam from Phil Joy here in England but it needs slightly stronger springs. It beefs up the midrange

Offline Jens

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Re: Building a DRM 400
« Reply #88 on: January 25, 2010, 05:39:30 pm »
Cloggy!

I would be very interested in a Phil Joy cam. I live in sweden, how do I get in contact with him (Phil Joy), aprox how is it (the cam). Megacyclecams have beefed up springs if I´ve understood their pricelist correctly, which oughta suit the application. Perhaps I should just wire you the money alongside with my adress and wait patiently like a child for christmas  ;)

Jens
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Offline cloggy

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Re: Building a DRM 400
« Reply #89 on: January 26, 2010, 05:09:43 am »

   
   

   
Joy Engineering Motorcycle Camshaft Specialist
Tel 01279 730 682
The workshop
Ryes lane
 Hatfield Heath
Bishops Stortford
CM22 7BS
I think the post code is correct, but you'd be better to ring him first
He charged me £90 all in and I supplied the cam to be reworked. I have a few spare.