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Old 04-22-2013, 02:07 AM   #14371
wundis
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Joined: Apr 2012
Location: Vilnius, Lithuania
Oddometer: 75
Quote:
Originally Posted by mait View Post
I just finished assembling my bike yesterday and took a short test ride of 50kms, didn't have too much time. To be honest I was surprised it fired up immediately and worked so well with so many mods. I was expecting a lot of hassling with jetting etc. But it was running strong throughout the revs. With new cam and fresh piston I did not push it to the limits yet. I will do some jetting and mileage tests in next few days as soon as time permits.

Mods done:
new piston 106mm,
redesigned air intake (cut the intake opening of stock filter larger just like Rob and Ray experimented).
SR43A camshaft
Lars' oversize header
GSXR muffler
130 main jets
45 pilot jets
taillight, indicators, handguards
Ooh, nice one mait. Hope she runs well. If I get no more silly delays (like a broken bolt and a piece of drill in my eye) I hope to finish working on my Big this week too...
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Old 04-22-2013, 07:07 AM   #14372
mait
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Spen, the bike looks much better on the photos than in real life. The plastics and bodywork need some serious attention soon. But not before Wilbers shock and pumper carbs.

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Bikes looking good
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Old 04-22-2013, 11:30 AM   #14373
StefanS.J
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Great Looking Bike!!
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Old 04-22-2013, 12:53 PM   #14374
jurvooss
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someone ever tried to ditch the whole cushion system on the back of a dr800 1990, so the shock is attached from frame to swingarm (directly)!?
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Old 04-22-2013, 02:18 PM   #14375
Bambi
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Hello mait,
looks good!!!
Concerning the need of attention to body-work:
Iris did a great job polishing these parts with car-wax (and lots of elbow-grease!). We had some white-couloured wax from a white VW Caddy pick-up we owned for about 10 years. That worked great with the white parts. There should be also a can of red wax from another (red) Caddy (that I still own and would love to restore) and a red VW Polo. That'll be tested on the red parts of the bike. When I find that can again ...
Kínd regards, Bambi
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Old 04-23-2013, 02:54 AM   #14376
Simosez
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well i have finally decided what i want to do with my Big. it is going to cop a top end rebuild using one of Maits custom pistons (thanks Mait) freshen up the head, cma chain, balancer chain a set of pumpers and a custom airbox.
Lars, can i get one of your header pipes. how much?
i've already got good suspension on the old girl and it has done over 105,000ks so i need to know that i can rely on the motor.
i will try to remember to post up pics.
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Old 04-23-2013, 05:48 AM   #14377
bluesman
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Quote:
Originally Posted by jurvooss View Post
someone ever tried to ditch the whole cushion system on the back of a dr800 1990, so the shock is attached from frame to swingarm (directly)!?
That's bad idea, trust me. I had bikes with this setup. They NEVER performed suspension-wise as good as proper progressive. Even KTM gave up on that.
One of most important charactersitics of DR Big is it's surprisingly good geometry and handling. It can carve tight corners or go through forest. By ditching very well calculated progressive system you will kill one of this factors. And even PDS shock won't help really.
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Old 04-23-2013, 08:05 AM   #14378
Silent Hunter
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Guys, I just changed the sprockets of my DR big to 16 front, 42 back.
The power is amazing. I was going 100km/hr at barely 3,500 RPMs.

Previously on 15 front, 45 back, the bike needs to go up to 4,000 RPMs to match that speed.
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Old 04-23-2013, 02:17 PM   #14379
Bambi
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... and how does it feel getting it rolling from a stand-still? And when you get into the twisties, perhaps even up-hill?
I'd be rather thinking about putting one more tooth on the rear in search of more grunt ...
Kind regards, Bambi
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Old 04-24-2013, 05:05 AM   #14380
Silent Hunter
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I haven't tried that yet, been raining cats and dogs here the last 2 days.
But I reckon because the DR Big is a big single cylinder, even though there will be some power loss, it shouldn't be so bad as not to be able to climb up a hill.
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Old 04-24-2013, 09:29 AM   #14381
mait
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Simon,
the piston and parts were shipped today. Should arrive to you in 7 - 9 days.
Cheers,
Mait

Quote:
Originally Posted by Simosez View Post
well i have finally decided what i want to do with my Big. it is going to cop a top end rebuild using one of Maits custom pistons (thanks Mait) freshen up the head, cma chain, balancer chain a set of pumpers and a custom airbox.
Lars, can i get one of your header pipes. how much?
i've already got good suspension on the old girl and it has done over 105,000ks so i need to know that i can rely on the motor.
i will try to remember to post up pics.
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Old 04-24-2013, 06:05 PM   #14382
Simosez
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thanks Mait.
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Old 04-25-2013, 07:33 PM   #14383
Bob Herr
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42tooth rear sprocket

Quote:
Originally Posted by Silent Hunter View Post
Guys, I just changed the sprockets of my DR big to 16 front, 42 back.
The power is amazing. I was going 100km/hr at barely 3,500 RPMs.

Previously on 15 front, 45 back, the bike needs to go up to 4,000 RPMs to match that speed.
Yeah. Check out my post 14326. I just made this mod recently and really like the result. I kept the 15 tooth front and motor is turning 3600 RPM at 100K/hr. Looks like the 16 tooth front gives you an additional 100 RPM drop.
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Old 04-25-2013, 10:50 PM   #14384
shanekfalcon
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Horizons Unlimited Meetings 2013

Hi guys,

Just wanted to encourage you all to have a look at this post:

http://advrider.com/forums/showthread.php?t=877957

It would be great to see a bunch of DR Bigs there.

Thanks,

Shane
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Old 04-27-2013, 06:42 AM   #14385
spen
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IT"S ALIVE
I stuck some petrol in a small bottle and threw some down the plug hole and after many turns it started :tup: the engine is very quiet alot more so than my 800 i was surprised as it has 77k km on it so just run in :tup: now i can get all the paint work done atleast knowing i have heard it running






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