CHOP CULT HOME
GALLERY   FEATURES   FORUM   EVENTS   CLASSIFIEDS   BLOGDUMP   COMMUNITY   MEMBERS   STORE  
















Harley WR Racing Engine

I've been jammin' the last few weeks to get this WR engine done so I can deliver it to
The Mama Tried Motorcycle Show on Feb. 15-16 in Milwaukee.  This particular engine has some documented race history with a top 5 finish in the early 1950s at the legendary Springfield Mile. 
After repairing the engine cases, machining, measuring, etc.  Almost every part on the engine has required attention.  The motor was assembled when I received it, but the parts mirrored "swap meet specials" haphazardly assembled.  The ball bearing construction appears easy to conquer...but now you're dealing with hand-press-fit on everything.  It's very difficult to align the cam timing marks when each cam is pressed into position.  There are so many particulars that need addressed when assembling an engine of this nature.  Basically, it's got to be perfect, or it won't run at all.  This is the 5th ball bearing-type engine I've built (with my dad too) - and we still spend about as much time reading, as we do building the motor.
The magneto is a horizontally mounted Wico Single Fire type unit.  The ignition timing is best set by
location of the piston to TDC...then verify the timing actual timing mark on the flywheel.  On the earlier WRs, once the gear cover is on...you can't change your timing from the outside, since the magneto is bolted solid to the case.  No rotation.  The Wico cap has a #1 which indicates the REAR(or #1 cylinder) and the spark plug wires must be installed correctly. 
I updated the sprocket shaft seal (from the steel reverse thread seal) to a modern type rubber-lip seal.  The seal kit (from Colony) is the same as a Big Twin seal, since the sprocket shaft in a WR is the same diameter as a panhead....but runs the larger 25mm ID ball bearing.  A #1205 ball bearing to be exact: 25mm x 52mm x 15mm Superblend-type bearing.

The lower pump has been checked over, blasted, washed and inspected.  I painted it my special cast iron gray, installed, with breather timed.  I bumped the breather ahead 1 tooth, since the piston was already about 2" down in the cylinder before it started opening (via timing mark).  By one tooth advanced, the breather window opens just after TDC - to get that crankcase evacuated of pressurized air a bit sooner. 


Comment with Facebook


 
 

Comment with Chopcult (0)

Please Login to Comment





Recent Blogs

Monkeying around in the snow

After watching Flat Out Friday live streaming last night, I think I was inspired to get outside and ride.  I carved a track in the backyard with my snowthrower, put my studded tire on the Evil Monkey, and had a blast.  My daughter took the riding photos.

Hell On Wheels presents the Lake Elsinore Scrambles

Click here for full information and to preregister.

Watch Flat Out Friday now!!!!

Head over to our Facebook page to watch Flat Out Friday live now.

Mama Tried 2018 - Part 8

The Mama Tried Motorcycle Show isn't just a bike show, it's a full weekend experience.  When you consider the show itself, Flat Out Friday, a visit to the Harley-Davidson Museum, multiple concerts, and ice riding on Slippery Sunday (weather permitting... and it did not cooperate last year), you really can't ask for more.  I'm bummed I'm missing it this year but I hope everyone that attends has a blast.  The last few years will be hard to beat, but the show seems to get better every year.  Have fun everyone!  I'll leave you with some photos of One (Metallica tribute) and Weedeater at last year's show.

These guys were so good.

Pushin' and shovin' in the pit (Rave security was not amused):

Weedeater was fun to photograph.  The facial expressions are fantastic.

Bottle's empty?  Show's over.

Have fun at Mama Tried this weekend!!!

SD in ADK


Mama Tried 2018 - Part 7

Wrapping up my photo coverage of last year's Mama Tried Motorcycle Show.  This year's show is only a few days away!

Details, details, and more details...

This thing looks so much fun:

Nice custom badge:

Something about rodents & motorcycles...

I didn't forget about the concerts... One (Metallica tribute) was awesome and Weedeater was an experience.  Those photos are up next.

Mama Tried Motorcycle Show Weekend Schedule

Bypass the long lines by purchasing your advance tickets for Flat Out Friday and Mama Tried before the party begins this weekend. We want to thank Benny Stucker for covering the mayhem for us. Expect a full feature soon!

New Bike Feature on ChopCult


Click here to check out ChopCult member Mark Kirkland's 1990 EVO


Mama Tried 2018 - Part 6

Lots more photos from Mama Tried 2018. If you're anywhere near Milwaukee, the 2019 show is this weekend!

Biltwell brought their dual-sportster:

So many awesome details on this bike:

Chvrch!

Rear fender done right.  I love this:

Amy's bike (built by Kevin):

Forget Bondo... I'm pretty sure this bike was made of saltwater taffy:

Heavenly light:

Moooooooo...

Check out the sticker:

Nice use of satin paint:

I'll finish up Mama Tried 2018 coverage tomorrow with one giant post full of motorcycles and concert pics.
Share This


         
CHOP CULT HOME

 

ADVERTISE    |    CONTACT    |    ©2009 - 2017 ChopCult    |    REPORT ABUSE    |    CONDUCT


Chopcult on Instagram Chopcult on Pinterest Chopcult on Tumblr Chopcult on Facebook Chopcult on Twitter