Sunday, April 22, 2012

Flathead stroker - update 2'ish

So, the engine is now assembled - and on it's way into the frame.

Hylomar is the shiz.

There was a bit of a hazzle with the bottom mount for the scavenger pump, so I had to call Lau Gotthard for a favor and actually got to pillage his partially assembled WLC engine for this part - what a champ - thanks for that!

So for my next trick I've been putting the complete bike together - electrical, using a magneto and no battery - more on that in a later update.

Also spent a few minutes getting the 38mm Mikuni on there. It looks good, and should feed this puppy sufficiently. Starting out with a 350 jet and needle in middle position - and I'll take it from there. 

Had to do a bit of porting on the manifold as there was a huge wedge where the Mikuni met the manifold, which should help improve flow a bit.

Getting closer to making some noise!

Old Dirty Motorcycles

Saturday, April 14, 2012

The Motorious blog

There's a new blog in town - and it's actually what we have as website right now for the shop - so stay tuned to see what's coming in and going out of the shop. Drop by and say hi if you're in town. Click here.

Old Dirty Motorcycles

Friday, April 13, 2012

Big Twin Flathead stroker project update

So the flathead engine I've been putting together is almost done. I've been lousy at posting pics about it, but at least I have them - and I'll post a few from now on to show the process and hopefully a successful kick sometime soon.

I'm using a T&S 4,5" stroked flywheel to make an 84" Flathead (originally an 74", but has been bored to 80"- and then plus the stroke it ends up at 84"). The pistons are standard flat-top flathead pistons, which have been shaved 3,5 mm so they clear the casings/baffles when coming down. The connecting-rods just clear the houses, but only barely and I think any minor discrepancy there be between each housing mould might mean that something should be shaved off them as well - but not on this engine. A longer stroke than 4,5" would require that - and that would also require other pistons as far as I can read from clever people. 

The clearance to the head is 1,2mm - out of which 0,5-0,6 is the copper gasket. This means the pistons stops at 0,6mm before the deck. This distance was created will a quite small stroker-plate + a gasket on each side lifting the cylinders about 2mm higher that stock. 

The calculation of the compression is below here (in cc's) - ending up at 7:1.

The cams had to be smoothed out as they where like sandpaper on the lifters - another little detail.

Getting closer!

The observant viewer will notice that the spiral drive breather valve gear has the threads the wrong it wouldn't engage with the pump. Hadn't noticed till assembly was full under way - so had to find one during easter holidays really quickly, but that's where Frank comes in. Every time - great stocker and great guy. Thanks for all the parts!

Half way there!

More to come.

Old Dirty Motorcycles

Thursday, April 12, 2012

Motorious: Grand Opening party

We're proud to finally announce our Grand Opening Party. The poster is fresh of the press; a linocut by our good friend Jens-Andreas, a talented graphic artist, illustrator, banjo player and connoisseur of polish beer and women. The party is in Copenhagen on May 26th 2012 from 12:00 till ????

Motorcycles, food from the bbq-locomotive, exotic music and cold beer. We will also have a good old fashioned auction where you'll have the chance to make a good bargain, buying or selling, so if you have any rare parts, unique pieces or fantastic motorcycles you would like to sell on the auction, please contact us on 

Saddle up your oldest bike and pop by for a good time in the middle of Copenhagen on May 26th.

Old Dirty Motorcycles