Prince George Vintage Motorcycle Club

Technical Section => Complete Rebuilds => Topic started by: stikman on June 04, 2019, 12:27:29 PM

Title: Honda Chopper Build
Post by: stikman on June 04, 2019, 12:27:29 PM
Been picking away at sections of this build and sourcing needed parts over the last couple years, but just got down to seriously building last month.  It makes a difference when you have all your ducks in a row and a deadline.  My plan has been to ride it down to Kamloops a week from now, so I've been burning the midnight oil trying to get it done.  I'm optimistic.

Old 70s C&G frame
(https://i.imgur.com/Cbk6hZq.jpg)

Fairly current mockup
(https://i.imgur.com/7Y3nsCG.jpg)

Here's a few pics of some of the progress:

Frame paint
(https://i.imgur.com/qtXI7x4.jpg)
(https://i.imgur.com/3Pdlejy.jpg)
(https://i.imgur.com/0aU42RD.jpg)

Filling holes in an old fender
(https://i.imgur.com/7xfYQXt.jpg)

Fender mounts
(https://i.imgur.com/jalWuda.jpg)

(https://i.imgur.com/YkEmDoO.jpg)

Electrical box coming together
(https://i.imgur.com/M2q3TFW.jpg)

Power and negative wires from 6ga welding wire and piggy backed ring terminals for custom sizing
(https://i.imgur.com/uKGf2Zr.jpg)
Title: Re: Honda Chopper Build
Post by: Dennis on June 04, 2019, 05:14:37 PM
EXCELLENT !!

"It's not a motorcycle.  It's a chopper, baby"  (Bruce Willis, Pulp Fiction)

A deadline can work wonders for completing a project.

In 1985 I built a rigid Ironhead sportster.  I booked a 3 week vacation long before the bike was finished for a ride down the west coast to San Francisco.  I finished the night before I was supposed to leave.  The old Ironhead was (at that time) electric start only.  The custom oil tank had room for a much smaller battery.  On testing the day before I was to leave, the little battery would barely click the solenoid.  I loaded up the bike and push started it;  I had a three week trip planned and I was going.  I parked on hills wherever I could, and when I couldn't it was push starting.

In Washington I met some bikers who insisted we could convert the bike to kick start only over the weekend.  I stayed a couple of days and put in a kick starter.  Parts were all available at local shops and at about a quarter of the prices in Canada.  Left all the electric starter parts with my hosts.

I hope you get at least a little time to shake out the gremlins.  I've never finish a bike problem free.

I love the build pictures.

Peace & Grease, Dennis.
Title: Re: Honda Chopper Build
Post by: stikman on June 04, 2019, 10:13:42 PM
Yeah cheers for that, Dennis.  I'm definitely hoping to be done in time for a shakedown run or two.  Funny you mention the battery; I'll be picking up the new one tomorrow and it has to be smaller because of the same issue, oil tank.  Should be alright though, I'll have a kick and starter on this motor, but the one I'm building for it long term is kick only.  Sounds like that was a heck of a trip back then eh.
Title: Re: Honda Chopper Build
Post by: stikman on June 20, 2019, 12:08:44 PM
Finished the build last Wednesday, left for Kamloops the next day.  Made it there in one piece, though not without issue.  Mainly oil leaks from aluminum weld repairs on the case from a previous owner.  Made for a bit of a sketchy situation having a decent amount of oil on the rear tire and drum.  Found out I lost the big front motor mount bolt somewhere along the way which was pretty wild.  Otherwise just minor stuff like header clamps coming a bit loose from heat cycling, etc.

Did some riding down there with my brother and a couple buddies.  Rode out to Armstrong on a really hot day.  Beauty ride that!

Trip home was less eventful for the bike.  Moreso the hefty winds and cooler temps the whole way back.  Finished the build a week ago and already put dang near 1500 kms on it, so I'm stoked.

(https://i.imgur.com/NvHA8Ww.jpg)
Title: Re: Honda Chopper Build
Post by: stikman on June 20, 2019, 01:58:09 PM
Here's some pics of some of the progress along the way.  I have a hard time stopping my work just to grab a picture, but I tend to wish I had afterward.  Most work is just time consuming stuff anyway and doesn't translate well to pictures, as many of you are no doubt aware.

Old springer stem.  Not sure what it fit before
(https://i.imgur.com/jM4e5Mx.jpg)

Springer torn apart
(https://i.imgur.com/nrGtpd9.jpg)

New stem I had Jeff make up with stock CB750 specs so it even uses the stock adjuster nut but takes a big acorn nut top and bottom.  Also had him lathe up some new oilite type bushings for the rockers (not pictured)
(https://i.imgur.com/54bYPaB.jpg)

Sissy bar main uprights.  I used 5/8" cold rolled round stock.  Notched them out with an angle grinder and zip disc.
(https://i.imgur.com/Dnn8ksK.jpg)

Made some mounting tabs to suit and welded them on
(https://i.imgur.com/ebabzIl.jpg)

Drilled and tapped the axle plate for M10 bolts
(https://i.imgur.com/43h1xAw.jpg)

(https://i.imgur.com/kwdSJAQ.jpg)

First couple of bends on each side to bring the uprights close to the fender
(https://i.imgur.com/DD9yI7N.jpg)

The next couple bends brings them over the fender and tight to the seat
(https://i.imgur.com/1IOZwNy.jpg)

Cut out a piece of dumpster dive 1/4" steel plate
(https://i.imgur.com/VnquIzk.jpg)

Many hours later a fender support appears
(https://i.imgur.com/IWL7XUm.jpg)

The seat rear mounting tab would eventually be captured by these same 2 mounting bolts, which would be drilled and tapped directly into the 1/4" fender support for M12 allen bolts instead of the clearance holes that the pictured M10 bolts are going through
(https://i.imgur.com/mbohyJp.jpg)

Center upright and cross bars tacked in
(https://i.imgur.com/bRto9ww.jpg)

Bent up some South Bay style support struts for a little extra help with the tall sissy bar bounce
(https://i.imgur.com/JLtXbso.jpg)

(https://i.imgur.com/GzudzEQ.jpg)

Notched the round stock with a zip disc for a cleaner look instead of needing a tab welded on.  They mount to the frame with M10 bungs
(https://i.imgur.com/Vgq03Wx.jpg)

Final sissy bar mockup
(https://i.imgur.com/wN86kyV.jpg)

Ready for final welding
(https://i.imgur.com/b7cq9nA.jpg)

Bondo'd the holes in the rear fender that I had filled and welded up
(https://i.imgur.com/JsiyQYB.jpg)

Bit of primer
(https://i.imgur.com/ZcpA4c0.jpg)

Fender ends up mostly hidden by the seat but still nice to seal it up.  Also did up the license plate mounting tabs
(https://i.imgur.com/VNKt5rY.jpg)

Made some tabs for the box taillight.  Didn't spend enough time to get the tapered head bolts totally flush with a die grinder, just had to push on.  A drill press and larger bits would make things alot easier
(https://i.imgur.com/doEEKih.jpg)

The hole for the wires was on center which didn't suit my application, so I drilled a couple new holes and added grommets
(https://i.imgur.com/9qSbTIt.jpg)

Ground off the old kickstand mount because it interfered with the exhaust pipes.  This was the last day before I needed to ride it south and I couldn't mount the kickstand and pipes at the same time, which is a problem as you can imagine.  So I was really pushing to get this done.  Started with a stock CB750 kickstand and cleaned off the spring tab, etc
(https://i.imgur.com/We1Eymd.jpg)

A bunch of heating, bending, and mockups later I welded the mount to the frame and have a kickstand that clears the pipes
(https://i.imgur.com/VcvsPTW.jpg)

The spring mount is a little too close so it doesn't snap the kickstand up or down quite as much as I'd like, which I'll change eventually
(https://i.imgur.com/XmyKVnC.jpg)
Title: Re: Honda Chopper Build
Post by: stikman on June 20, 2019, 02:10:20 PM
So here it is after being through the ringer.  Painkiller is a mostly stock, slightly modified 1971 Honda CB750K  ;D

(https://i.imgur.com/Th2ebRd.jpg)
Title: Re: Honda Chopper Build
Post by: Dennis on June 20, 2019, 04:57:57 PM
Love it.  Finished bikes often give few clues about all the fab work that goes into the finished ride.  Photos while you?re going along are great.

Peace & grease, Dennis
Title: Re: Honda Chopper Build
Post by: stikman on June 21, 2019, 12:53:13 AM
Love it.  Finished bikes often give few clues about all the fab work that goes into the finished ride.  Photos while you?re going along are great.

Peace & grease, Dennis

Man, that's the truth eh.  Glad you dig it