Harley Softail 1640 Evo Casarva trike build

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SteamGirl
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Harley Softail 1640 Evo Casarva trike build

Post by SteamGirl »

Arrrrftanoon all :cuddle:

So, I’ve decided to put my CX500 (Tinkerbell) trike build on hold and get stuck in to my Harley trike build.

The bike itself started life as a late Evo Softail heritage springer. She was one of 10 bikes stolen by a biker gang from a Harley dealer in the late 90’s and turned in to a custom chopper and re-registered in 2002 as a Custom classic. I’m unsure of the rest of her history, but she ended up with my best friend’s (well he’s more like a brother actually) uncle Kev. My “brother” ended up with the chopper and turned her in to a bobber. I then bought her off me brother to turn in to a trike.

I decided to buy a Casarva brute belt drive trike conversion kit for this project and I’m very pleased I did. The design and build quality is outstanding and the parts provided are extensive. I went for the cradle and BMW diff with half shafts that I need to shorten once the diff position is finalised, an anti roll bar, BMW hubs and disks with VW callipers, a handbrake kit, their own design of beautiful fully adjustable shocks and enough tubing/rose joints to fabricate the mounts on the cradle to bolt to the stock Harley frame. I also bought a Zodiac reverse gear kit.

As soon as my workshop extension was completed I fitted a 5 degree triple tree kit and 10” over billet forks to the bike. I’ve been advised that this will make her handle better as a trike once converted. I also fitted a set of Vance and Hines big radius pipes.

Over the last 2 days I’ve stripped the back end off the bike and built up the diff cradle/swingarms/shocks/roll bar/wire wheels etc so I can begin mocking up and offering it up to the back of the frame. I’ve also machined and fitted a chrome pulley to the BMW diff.

At first I couldn’t get everything to flow together because with the bike frame at its original ride height and the cradle in a position where the belt didn’t rub on the cradle it was all at different heights and just looked like a bike with a cradle stuck on the back :o eventually I had to rise the ride height of bike frame to get things to flow and look right, which meant the belt rubs on the cradle frame, so that is a job I will tackle tomorrow by altering the cradle to give the belt free passage. Also the big radius pipes were too long and hitting the diff cradle, so I’ve taken off the rear heatshields for now and will cut them down at some point, but in the meantime I have removed the baffle and cut down the pipe that was catching the frame still, then re-fitted the baffle. I know the difference in length between the 2 pipes could cause an imbalance, but as the pipes aren’t balanced and she still runs like a Swiss watch I’m not worried about it for now.

I’ve ordered a laser level machine so I can get everything perfectly in line and level, once it is delivered I can start planning the fabrication of the mounting points, diff mount bushes and alter the half shafts to the correct lengths.

Those of you who have been following my build on Tinkerbell will know I’m quite aspy and takes loads of pictures of my projects. I always save them to an album in the Google cloud thingy and then share the link to people reading my threads. All you have to do is click on the link and if you join the album group you will get updated when I upload new pictures :thumbsup: the album also has loads of pics in it from when my brother Pete had got the bike and his conversion of her in to a bobber.

So here’s the link

https://photos.app.goo.gl/tbhnrnHgUdRBVU3L9

I “think” I’ve also attached a couple of pics to this post, but not sure if it’s worked or not :o

Anyhoo, sit back and have a good look through the pics, I hope I haven’t bored you to death in the meantime, I do tend to waffle on :hoofle:

Take care, Steph :grouphug:
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Overcoming little hurdles everyday :handlebars:
Deep Diver
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Re: Harley Softail 1640 Evo Casarva trike build

Post by Deep Diver »

Another great thread to read up on. :thumbsup: :thumbsup:
I tried to be normal once, worst two minutes of my life.

Barry the cantankerous old goat. :poke:
Andy from Sandy
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Re: Harley Softail 1640 Evo Casarva trike build

Post by Andy from Sandy »

With all due respect I think you have put the frame out of line with the longer front forks. If you lower the front the lower part of the frame will be just about parallel with the ground and then the cradle should also be parallel with the ground all in a line.

I have built a Sportster trike using the Casarva kit. There is a big loop of frame at the bottom for belt clearance and the belt misses the top of the cradle by a couple of inches. This is all the while keeping the stock ride height at the front and therefore the frame level. The differential on my trike is more or less on the same axle line as when it were a bike.

If I were now to jack the front of the bike up by 10" clearly nothing would change the relationship between bike and back end.

I think you will find Casarva get the shocks from a company called Protech Shocks.
SteamGirl
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Posts: 86
Joined: Mon Sep 18, 2023 9:31 am

Re: Harley Softail 1640 Evo Casarva trike build

Post by SteamGirl »

Andy from Sandy wrote: Fri Oct 04, 2024 6:07 pm With all due respect I think you have put the frame out of line with the longer front forks. If you lower the front the lower part of the frame will be just about parallel with the ground and then the cradle should also be parallel with the ground all in a line.

I have built a Sportster trike using the Casarva kit. There is a big loop of frame at the bottom for belt clearance and the belt misses the top of the cradle by a couple of inches. This is all the while keeping the stock ride height at the front and therefore the frame level. The differential on my trike is more or less on the same axle line as when it were a bike.

If I were now to jack the front of the bike up by 10" clearly nothing would change the relationship between bike and back end.

I think you will find Casarva get the shocks from a company called Protech Shocks.
Thanks Andy, you’re absolutely right !

I knew the 5 degree rake triple tree didn’t offset the longer forks as soon as I fitted them because the frame didn’t sit fully parallel to the ground, but I quite liked the new stance as it had a slight sit up and beg front look about it similar to how choppers used to look in the 60’s and 70’s. A wise old biker once said to me “it’s not been chopped properly if the frame isn’t parallel with the ground” and I agree with that, however I didn’t want to start raking the headstock too as I don’t have a frame jig I can use. In all fairness the 10” over forks sound excessive, but due to the angle of the forks the actual rise in ride height at the front was only about an inch.

My cradle was built with the clearance hoop on top, maybe Casarva make the cradles differently for Sporsters and the big twins ?

Anyhoo, I’ve spent the last couple of days lining everything up with the laser level and measuring distances over and over again to make sure everything is straight. I’ve also got everything to flow really nicely now, I’m really happy with it. To fix the belt rubbing issue I cut a section out of the bottom tube, then used steel plate to seal the ends of the tubes and then used 8mm plate that I shaped to fit perfectly in the bottom part of the tube and welded it up. It should be super strong and the belt now has free passage. I’ve made a start machining 2 bosses to weld in to the top of the cradle for the rose joints to screw in to and also fly cut some of the supplied tubing ready to cut to length to weld to the bottom of the cradle for the supplied rose joints and bosses to slot in to and weld.

I’ve added some more pics to the album, hopefully the pics with explain it better than I can lol.

https://photos.app.goo.gl/tbhnrnHgUdRBVU3L9

Take care, Steph
Overcoming little hurdles everyday :handlebars:
SteamGirl
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Posts: 86
Joined: Mon Sep 18, 2023 9:31 am

Re: Harley Softail 1640 Evo Casarva trike build

Post by SteamGirl »

Well I’ve had a busy day today gang, I’m proper sore lol.

On the bright side though, for the first time ever she is now on 3 wheels :thumbsup:

I’ve still got to tidy up the welds on the mounts and then triangulate them to give them more strength then the next job is to set the center of the diff and then shorten the half shafts.

I might need a few days off to recover though, I’m in agony after the last few days working on her. I’ve added more pics to the album :

https://photos.app.goo.gl/tbhnrnHgUdRBVU3L9

Take care all, Steph :grouphug:
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Last edited by SteamGirl on Sat Oct 05, 2024 6:20 pm, edited 1 time in total.
Overcoming little hurdles everyday :handlebars:
Davey the punk
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Re: Harley Softail 1640 Evo Casarva trike build

Post by Davey the punk »

Looks good steph 👌
Born a rocker die a rocker :triker:
SteamGirl
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Joined: Mon Sep 18, 2023 9:31 am

Re: Harley Softail 1640 Evo Casarva trike build

Post by SteamGirl »

Thanks Davey :beer:
Overcoming little hurdles everyday :handlebars:
SteamGirl
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Joined: Mon Sep 18, 2023 9:31 am

Re: Harley Softail 1640 Evo Casarva trike build

Post by SteamGirl »

Lol now that I’ve finally worked out how to attach pictures, here’s a few more :thumbsup:
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Overcoming little hurdles everyday :handlebars:
SteamGirl
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Re: Harley Softail 1640 Evo Casarva trike build

Post by SteamGirl »

And a couple more :hide:
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Overcoming little hurdles everyday :handlebars:
SteamGirl
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Re: Harley Softail 1640 Evo Casarva trike build

Post by SteamGirl »

Arrrrftanoon gang, all ok ?

Wow, been that busy haven’t had a chance to update the build thread, sorry :hide:

Ok, so, deep breath, I’ve triangulated and cleaned up the welds for the cradle mounts. I haven’t followed how I’ve seen other Casarva builds done because I likes the idea of having the top mounts within the Harley frame and not outside top and bottom. I’m really happy with how it looks and sits now.

The next job after that was to line up the diff with the belt sprocket and then machine the bushes to hold it in place. Casarva weld a bush on the diff bracket to give you a starting point but I needed an 1/8th off it to get the diff to line up, so I bolted it to my trusty old mill table and machined it down. Now I knew the exact path of the belt it was time to rebuild the bottom cradle tube to give it more strength and passage for the belt.

After the diff was done it was time to fit the driveshafts. I was lucky that the O/S shaft was a perfect fit and didn’t need any modification to fit. The N/S needed shortened by 4 1/2”.

So after building up the nerve I marked up the cuts and attacked it with and angle grinder :eek: to join the 2 halves together I chucked some 3mm wall tubing in the lathe and bored it so it was a friction fit over the shafts. As it happened the shaft had a groove machined in it that acted like a screw thread, so I was able to screw both halves of the shaft in to the tube until they met half way. I then welded around the ends of the tube over the shafts. After that I used a cutting disc to cut through the outer tube and over the both ends of the shaft. Once deep enough I then welded them all together and cleaned it up. It will be super straight and hopefully strong enough to cope with the 1640 Evo.

After that been busy sorting out a couple of loose ends on the front end, machining shims for the triple tree to make it a snug fit and also tack weld the steering stop to the bottom of the headstock. After that I cut down the exhaust heatshields and got them buttoned up :thumbsup:

So next on the list is to dry fit all the brakes, lines, handbrake, mudguards then I would love to fit a sissy bar for that chopper look. Actually, I had been messing around with about 4 old seats, making them fit and then deciding I don’t like them lol, so I’ve ordered a proper 60’s chopper style one from Le Pera, I’m certain it will look ace !

Anyhoo, here’s the link to the photo album, got a shed load of new pics to add so bare with !

https://photos.app.goo.gl/tbhnrnHgUdRBVU3L9

Take care all, Steph :grouphug:
Overcoming little hurdles everyday :handlebars:
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