Pink Diamond . A Honda 750 Digger.

If you were young in the 70’s, you probably think that everything was better when you were young. Especially Choppers. A guy named Joost asked custom shop in the Netherlands to build him a motorcycle out of all the parts he had collected in the last couple of years. Little gems like an Arlen Ness frame and Diamond gas tank, a Girder front end, two wheels. There was no other way, this custom could be only a cool Digger, Arlen style, paying tribute to the King Of Custom… Owner of the shop Jacco Reniers, better known as Royal Jack under which name he works as a a custom bike builder gifted painter and pinstripes, proudly tells the story of Pink Diamond right after this Honda Digger won its first major Best of Show.

“The build was completely done in-house. But as a very talented painter Jack is often at work at big shows and events all over Europe. Consequently the project took him 4 years although there were no major problems the build. But many parts were found to be incomplete or not conceived to fit together. So many modifications and one-off parts were needed to get to fit everything together” The Pink Diamond is an ode to the the custom chopper movement, to the way customizing was done by Arlen Ness and a few others. A style giving birth to a new industry. Too many, in the custom motorcycle industry, Arlen is a God. It was him that developed special chopper frames and parts and together with Jim Davis some of the daring/wildest/designs Choppers and Diggers (some with superchargers) ever built.

A new old style Stock Girder front end, a front 5-spoke Invader wheel, a NOS Disc rear wheel and Hurst Airheart brakes (two mini discs and a small caliper) make a perfect match for the Ness frame housing a big Honda 750 four cylinder. “I made the set ‘Spaghetti’ twisted exhausts, but to be honest, we are not completely satisfied with this set-up yet,” says Royal Jack, “I would like to make something different, but unfortunately we didn’t have the time to do that.” Perfectly period correct are the 60’s Dual Posa carburetors nicknamed ‘Lake Injector’ made to perform in aircraft. Not to be confused with a real ‘injection system’ A set like these is very hard to find, let alone complete with manifolds!

The Honda 750 engine was one of the first real fast and reliable engines, looking good, narrow, and for these 3 reasons used (like the Sportster Ironhead) in countless Choppers. Of course, before to be cradled in Pink Diamond the 1978 CB was completely overhauled and checked by Fourdeel, a company that specialise in Japanese bikes, based in Purmerend, The Netherlands.

Royal Jack fabricated the foot pegs, right hand side Hurst shifter, oil tank , the rear fender to match the gas tank diamond lines. Up front an old car headlamp is used. In the back an old NOS 69 Mastercraft lens one a one-off housing. Very detailed with pinstripes the paint job is quite mind blowing. Marcel Miller of Miller’s Uphostery did the two-tone “horny” seat in a typical retro chopper style. “Building the bike was something we did together. I was the builder but I could have never built this bike without all my client’s ideas. If I had built the Diamond myself, it would never had been the motorcycle it is now.” And he adds “What started as a business relationship between a builder and customer grew up into a real friendship!”  (with the collaboration and photos of Onno “Berserk” Wieringa)


Name of the bike: Pink Diamond.
Owner:Joost Mom
Builder: Royal Jack (Royal Kustom Works)
Make: Honda
Model: CB 750
Time: 4 years

Year: 1978
Builder: Honda
Displacement/ cc’s: 750
Type: CB
Cases: OEM
Cylinderheads: OEM
Carbs: Dual Posa carbs
Ignition: Elektronic module
Exhaust: Custom made
Transmission: OEM

Frame: Arlen Ness
Front end: NOS Girder
Front wheel: 5 spoke Invader
Rear wheel: NOS Disc Wheel
Brakes: Hurst Airheart NOS
Rear fender: custom made
Gas tank: Diamond Arlen Ness tank
Dashboard: Electronic
Oil tank: Diamond shape
Handlebars: custom made
Grips: old style
Brake / clutch lever custom made to mimic Hurst clutch lever.
Head light: NOS car headlight
Tail light: custom made housing with NOS Mastercraft 69 lens
Seat: custom made plate with Miller custom upholstery (velvet and pluche)
Foot pegs: custom made supports with old style pegs
Brake and shifter pedal: custom made, hand shifter with Hurst knob

Homemade / Special Parts and/or details:
Wheel hubs, peg supports, rear fender, bearing cups, handlebars, brake parts, motor mounts, side mount, tail light housing, clutch lever, all the brackets, jiffy stand, head light support, hand shifter, exhaust system, wiring, ….too much to mention everything.

Color: Metallic Silver basecoat. Pink, Purple, Blue Candies.
Make and type paint: Metallic with Candy on top of Custom Creative.
Painter: Royal Jack (Royal Kustom Works)
Special Paint / logo’s: Lace effect, endless lines and pinstriping.
Idea: Royal Jack/Joost Mom
Design: Royal Jack/Joost Mom

Special thanks to:
Leo Klootwijk for his help. BNM Motoren for putting the tires on the rims. Tolenaar Elektrometaal bv Rotterdam for chroming. Miller Custom Upholstery for the horny velvet seat upholstery. Fourdeel for overhauling the CB engine.

31 Responses to “Pink Diamond . A Honda 750 Digger.”

  1. 1 Woody's Mar 26th, 2018 at 8:15 am

    So fine, a classic like the little black dress. Beautiful bike.

  2. 2 splattttttt Mar 26th, 2018 at 8:19 am

    Looks like a perfect replica of a late 60’s frisco high end custom minus a v twin
    Could have at least used a thumper. But a 750?

  3. 3 BOSS HAWG Mar 26th, 2018 at 8:21 am

    Old School Cool….GREAT looking Digger with a Hurst shifter and a 750 Honda motor.

    Gotta love it!

    Boss Hawg

  4. 4 Walter Mar 26th, 2018 at 8:48 am



  5. 5 Number6 Mar 26th, 2018 at 8:50 am

    A sweet custom done in authentic Classic 70’s Chopper style ( not a digger … not even close bh ) looking like it just popped off the cover of Custom done to the nines . Two Thumbs Up ! As far as the choice of motors … hate to tell you but that 750 will wipe the floor with the majority of v-twins and thats the way we flew back then when the choice of motor did not determine one’s patriotism …. individualism had actual meaning rather than the current definition thats more about following the crowd … and the most important thing was to get out and ride .

    Ahh… ” those were the days my friends , we thought they’d never end ” …


  6. 6 Chief Waldo Mar 26th, 2018 at 9:19 am

    There’s some creative exhaust piping going on there!

  7. 7 takehikes Mar 26th, 2018 at 10:09 am

    I thought I was in the wrong place….a real chopper not some big assed bagger. Damn its nice and that my friends is very rideable.

  8. 8 Fzzzz Mar 26th, 2018 at 10:22 am

    Nice. Very tasteful. Looks like it would be loud too.

  9. 9 domino Mar 26th, 2018 at 10:45 am

    Back in the 70’s Chopped Triumphs were my bike of choice, but I rode along side with a lot of CB750’s and Harley’s … All were respected equally …
    This is a great build!!
    ………….. Domino Dave …………..

  10. 10 Stony Crane Mar 26th, 2018 at 11:17 am

    You can’t go wrong with the Ness parts, he was one of the inventors of the look, so bravo.

  11. 11 fuji Mar 26th, 2018 at 1:20 pm

    Can’t forget Jeff McCann builder but most of all a perfectionist painter in the day the man to go to in California a close friend of Ness

  12. 12 BD Mar 26th, 2018 at 2:51 pm

    Nice much better than the POS baggers they build now with a 50 inch front wheel and fender that rubs the pavement….This was how things got their start in the 60’s and 70’s unfortunately we ended up where we are today!!!

  13. 13 Woody's Mar 26th, 2018 at 3:49 pm

    Like Fuji said, also young master Perowitz turned out some great ones, and one of my favorites with these style-Lowrider Tommy

  14. 14 Woody's Mar 26th, 2018 at 3:58 pm

    (hit enter by accident)
    Santee, Corbin Gentry, SB&F, AMEN, AEE all made great frames & stuff for the original DOHC 750’s. Quickly passed performance-wise by other brands, these were the ones many of us first drooled over, unlike this bike, memories of four parallel downpipe headers in front and four stacks out the back were a look that demanded stares, even though the ugly stock airbox and 4-1 supersport pipes were the hotter build. Those aftermarket finned valve adj opening plugs and the valve cover itself are cast aluminum and a good polisher could/can make them all shine like smooth chrome.

  15. 15 glenn Mar 26th, 2018 at 4:59 pm

    That is awesome!!

  16. 16 BadMonkeyMW Mar 26th, 2018 at 5:13 pm

    Beautiful bike! love it, very well done.

  17. 17 Xenu Mar 26th, 2018 at 8:12 pm

    In those days I rode a Dunstall Honda 750 and my brother rode an FLH 68 chopper that leaked and sometimes ran long enoughto cross town.That Honda engine almost killed HD except for Reagan’ s tariff.
    Deja vu!

  18. 18 Mike Mar 26th, 2018 at 8:20 pm

    Good God. That is the ugliest girl at the dance.

  19. 19 rebel Mar 26th, 2018 at 9:26 pm

    no turbo?

  20. 20 John Mar 26th, 2018 at 9:35 pm

    UGLY pile o junk

  21. 21 coma Mar 27th, 2018 at 1:58 am


  22. 22 Max Mar 27th, 2018 at 6:50 am

    not bad, if I did not already have a girlfriend I would prefer a honda digger

  23. 23 Dyno Don in Fla Mar 27th, 2018 at 7:02 am

    She is an eye catcher!

  24. 24 Hadley Mar 27th, 2018 at 7:30 am


  25. 25 Calif Phil Mar 27th, 2018 at 7:43 am

    Beautiful 70’s Chopper. I wish I was back in the 70’s.

  26. 26 Blind man Mar 27th, 2018 at 8:06 am

    Gotta love that old school look. This would have been a traffic stopper at the Bike Week Tropical Tattoo Chopper Show.

  27. 27 BOSS HAWG Mar 27th, 2018 at 9:46 am

    It’s a great looking Ol’ School Digger in my eyes.

    Those here that said otherwise, please elucidate.

    Boss Hawg

  28. 28 BD Mar 27th, 2018 at 10:36 am

    The haters of this work of art really are out of touch.. Most likely what their daddy rode with their momma.. Maybe time for a diaper change

  29. 29 Boomer Mar 27th, 2018 at 10:41 am

    Brings back memories. A lot of guys started out on the CB750 and turned them into some dang nice customs. At the time they were more reliable than Harley’s or the British bikes (due to electrics mostly). Quick too.

  30. 30 burnout Mar 27th, 2018 at 1:41 pm

    Nice!! peace

  31. 31 Sheridan Mar 27th, 2018 at 7:24 pm

    Absolutely brilliant!! A real stunner

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