Author Topic: 78 750F Chopper/Digger  (Read 77760 times)

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Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #300 on: November 27, 2013, 10:16:20 PM »
What i think gives these type of bikes a well balanced look is to have the bottom frame rail as close to parallel to the ground as possible, having the front end to high unbalances the bikes IMO... ;)

I could not agree more, Retro. I can't stand when choppers have a long front end but the bottom frame rails are pointing to the sky.  It looks like someone didn't plan ahead when raking the frame.  However, I am trying to find a compromise between aesthetics and function.  Whenever I get around to dropping the forks to see how it looks, bottom frame rails will be my biggest focus.  If it is painfully obvious that they are not parallel, I will keep things as they are.

Offline jaguar

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Re: 78 750F Chopper/Digger
« Reply #301 on: November 28, 2013, 11:37:00 AM »
In the pictures the frame rails appear to point down slightly in the front, so slightly longer forks would fix that and give clearance.

How about a springer?

Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #302 on: November 29, 2013, 09:49:44 PM »
How about a springer?

I have a nice girder front end that I've considered, but I was planning on using it for my next build.  If I get 4 over forks, I don't have to worry about relocating anything on the front.

Offline Stev-o

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Re: 78 750F Chopper/Digger
« Reply #303 on: November 30, 2013, 06:23:48 PM »
Let's see the mock up.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #304 on: January 02, 2014, 04:14:06 PM »
So I just decided to stick with the stock forks for now. Going to save the girder for the next project.

I decided on tires. Avon Speedmaster up front and Avon Roadrider on the rear. They are ordered. I also ordered the stainless steel braided line kit from pampadori.

I replaced the taillight and mirror with diamond-shaped ones to keep with the geometric flow of the bike.

Aside from replacing some stock bolts with Allen heads, and fine-tuning the carbs, I am calling this project complete!

Offline Stev-o

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Re: 78 750F Chopper/Digger
« Reply #305 on: January 02, 2014, 06:19:14 PM »
Good choice on the tires.  Need help with the carbs?....ha!
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline EnginebyAdam

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Re: 78 750F Chopper/Digger
« Reply #306 on: January 02, 2014, 06:37:12 PM »
Sweet scoot 8)
Better Rodded Than Rotten

Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #307 on: January 02, 2014, 08:48:12 PM »
Good choice on the tires.  Need help with the carbs?....ha!

Thanks Stev-o! I thought they were a good compromise between vintage look and performance. I think I should be good with the carbs... I know a guy ;)

Offline Stev-o

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Re: 78 750F Chopper/Digger
« Reply #308 on: January 03, 2014, 03:22:08 PM »
Good choice on the tires.  Need help with the carbs?....ha!

Thanks Stev-o! I thought they were a good compromise between vintage look and performance. I think I should be good with the carbs... I know a guy ;)

I put Roadriders on my Z1...love em. 

I'm looking for a carb guy, let me know if your guy is available!
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #309 on: January 09, 2014, 05:52:16 AM »
Picked up my wheels yesterday from the shop that I had mount and balance them. I am pleased except for the fact that they didn't remove the old wheel weights before they balanced them; they just added more. Oh well, it doesn't bother me enough to take them back and have them re-balanced.

Offline Stev-o

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Re: 78 750F Chopper/Digger
« Reply #310 on: January 09, 2014, 06:15:19 AM »
Picked up my wheels yesterday from the shop that I had mount and balance them. I am pleased except for the fact that they didn't remove the old wheel weights before they balanced them; they just added more. Oh well, it doesn't bother me enough to take them back and have them re-balanced.


That's sucks, I wouldn't be happy.  No pride in workmanship these days.

Are they the taped on weights?   
I like the weights that clip on the spokes, easier to clean the rim. 
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #311 on: January 09, 2014, 06:20:13 AM »
They are tapped on weights.

When I was younger, I was the tire boy at an auto shop. Step one, EVERY TIME, was remove the old wheel weights.

Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #312 on: January 09, 2014, 01:42:33 PM »
So I decided to take the wheels back in and have them rebalanced and I emphasized that I wanted all the weights taken back off. The mechanic was very apologetic and said they had a new guy filling in who should know better and that they would take care of it. So, that's alright.

Offline Stev-o

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Re: 78 750F Chopper/Digger
« Reply #313 on: January 09, 2014, 03:03:37 PM »
So I decided to take the wheels back in and have them rebalanced...

Good decision....you'll be glad you did.   What wheels?
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #314 on: January 09, 2014, 03:07:32 PM »
A nice set of stock comstars.

Offline Syscrush

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Re: 78 750F Chopper/Digger
« Reply #315 on: January 17, 2014, 05:49:12 PM »
Good on ya for going back and having the weights taken care of.  You would have thought about it every time you walked to the bike otherwise.

I can't speak to the Speedmasters, but Roadriders are great tires - better than I thought a bias-ply tire could be.  That's what I rock on my 'X and for the street they inspire just as much confidence as wider 17" radials.
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There's nothing more expensive than a free bike...
FWIW, I'm not a shill for Race Tech - I've just got a thing for good suspension and the RTCE's are the most cost-effective mod for these old damping rod front ends.

Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #316 on: January 17, 2014, 06:00:14 PM »
Thanks! The wheels look a lot better now. They took the clamp-on weights off and used adhesive ones. You barely notice them.

I chose the speedmaster front for vintage aesthetics and the Roadrider because I wanted Avon rubber on the rear. Good to know everybody loves the Roadriders!

Offline Stev-o

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Re: 78 750F Chopper/Digger
« Reply #317 on: January 17, 2014, 06:10:16 PM »
You'll soon love the Roadriders too.  Installing new bearings?
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #318 on: January 17, 2014, 06:40:11 PM »
I checked the bearings out and they seem good, so I'm gonna let them go.

Offline SOHC Digger

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Re: 78 750F Chopper/Digger
« Reply #319 on: February 28, 2014, 05:24:27 PM »
To commemorate the completion of this build, I got a tattoo of a 78F rod and piston. The pic doesn't do it justice!

Offline DustyRags

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Re: 78 750F Chopper/Digger
« Reply #320 on: February 28, 2014, 05:29:17 PM »
Nice shading work! Ought to look good when it's fully healed. Keep the sun off it!  8)
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Offline Retro Rocket

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Re: 78 750F Chopper/Digger
« Reply #321 on: February 28, 2014, 06:09:20 PM »
Nice shading work! Ought to look good when it's fully healed. Keep the snow off it!  8)

Fixed that for you... ;D
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
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Offline tweakin

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Re: 78 750F Chopper/Digger
« Reply #322 on: February 28, 2014, 08:06:12 PM »
To commemorate the completion of this build, I got a tattoo of a 78F rod and piston. The pic doesn't do it justice!
Looks good...  Could use some new rod bearings, I am guessing yellows... ;)

Offline Stev-o

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Re: 78 750F Chopper/Digger
« Reply #323 on: March 02, 2014, 02:45:41 AM »
Would have thought you'd get a tat of a rack! (of carbs)
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline paradiddle1

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Re: 78 750F Chopper/Digger - Technically Done!
« Reply #324 on: March 08, 2014, 06:42:30 AM »
I'm loving that I found this thread.  I have been looking for donor bike to build a digger - I have built 2 Amen bikes in the 70's when I worked at a chopper shop and wanted to do it again. So I have found bikes from a total piles of Junk to runners that I hated to disassemble. So last night I bought a 77 F2  not running but 90% complete.  I was thinking to restore but I really want a choppah.  Your bike has great lines revolving around the prism tank, comstars, stock brake's, low slung.  So I think i'm off the resto project and back on a digger.  I'm looking at the cycle x pro street frame with 34 deg but you say yours has 40 deg?  My old amens were level with 6+ but I don't remember the rake.  I guess what ever geometry it takes to get the height right.

I like a frame that has the bottom rail parallel with the road. I would keep yours the same height and if needed I would design the pipes to clear.  I remember the old Fubar 4-2 pipes and they were tight to the frame and similar to the std 4-4 shorty pipes in height and tight.  But I think u want an individual look with the pipes so I am sure you''ll figure that out.  Great build.


Ok, the bike is back together.  I have to finish bleeding the brakes, but other than that, it is mechanically done.

I still have to get new tires, which will go on another set of Comstars that I have polished up.  I also have my drilled rotors mounted on them.

The exhaust has some minor dents that I am going to try and pull out and then it will get sent out for powder-coating.

Eventually stainless steel braided brake lines will replace the stock ones.  A lot of the bolts on the bike will be also replaced with Allen-head bolts to make it look a little cleaner.

But enough talking; here's some pics.  Enjoy!














« Last Edit: March 08, 2014, 06:47:44 AM by paradiddle1 »