The BIG bore 2 smoker thread

Lets say around 400cc+ any year make and model.

What do you ride? Where do you ride it? What have you done to it? And the big question: Why do you need all that power?! :eek1

Here's my 1984 Honda CR500R.

Motor: 520cc (91mm) bore. Porting and head work by Eric Gorr. Lowered compression with major reshaping of the squish band. Decompression valve. Keihin PWK 39.5mm Air Striker. lightyears better than the stock time bomb/ping-king.

Suspension: Re-sprung with Pro-Action valving with 87 CR cartridge forks. Lightyears better than the stock pogo sticks.

Misc: Billet clamps, Scotts damper, Clarke 4.0 gal tank. classic gold wheels.

There is no sound on earth more captivating than a big bore finner at wide open throttle--can't get enough!

Cr5/KTM hybrid.
I use it for everything from single track to hillclimbs.


As for why, climbing takes lots of HP, and the cr is cheaper than the my bigger ktms to maintain/build.

My pics have been posted elsewhere on ADV, but my stuff belongs in this thread...because they are all (almost all) big bores.

And for any big bore rider that is contemplating a change, read this before it's too late:

http://www.off-road.com/dirtbike/fe...t-a-smaller-bike-why-500s-are-best-11104.html

I use hoops just like that on the back of my station wagon

Damn sweet collection you've got there Sir

this is what i ride, though it needs work at the moment

Guess after I save my milk money I know who I need to get in touch with to find a '79/'80 GS 400+

Thank you.

This is the bike I have been working on:


It's a 1976 YZ400:


Put the bike back together and have ridden it out in the desert. But have pulled the motor out again, going to rebuild the motor.

I built this '70 CZ 360 sidepipe to race in the vintage races at Hollister Hills. It's on the first piston for a '73 CZ 400, so its no longer a 360. Last month I smoked a couple of young guys on 450F's on the HH TT track. They thought I was just a fast old guy, but they don't understand how much better the lower CG bikes turn. I've trail ridden a few times and the power of the old air hammer is impressive.

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I am very excited about cr500 I owned several in the past haven't had 1 for a while. I am super stoked.

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heres my 1991 CR500 thats getting a restoration [im waiting on top end parts] yeah,these big bore bikes spoil you- anything else just wont cut it im afraid....

Great looking bikes everyone. I've said it before but I love that blue/yellow Maico dynodave. You don't see those very often--if ever in the states

I will buy a Cr500 or Kx500 for next summer... They just sound like too much fun

Thanks Rot Box. I traded the `94 320 for an `81 GS490 in need of a full resto.

Check these out. All big bores and all sold some time ago, along with some others. I had them all at the same time and could not get into my shop:

I'm not a Maico connoisseur by any stretch but I do know that GS490 is a very rare bird. Sounds like you made a good deal

Very nice bikes/pics btw!

Maybe isn't old but is a really big bore 2t

Is a Husqvarna WR360 9?...with 52HP !!!

Yamaha IT490. I had a few heroic get offs on that bike, I was not a very good rider in my teens, lol. I also recall it pinging and snorting more than my old 175.