1978 ATC90 Converted to a 2 Wheel Monster Trail Bike

[BigfootBikes]

Here is a video and some pictures of another custom stupid-fat tire trail bike I am building out of a 1978 Honda ATC90.


My dad's build that I posted here (http://www.3wheelerworld.com/showthread.php/191330-ATC110-Two-Wheel-Conversion-Build-pics-and-video!) turned out so dang nice, I figured I would have a go at another one.


https://www.youtube.com/watch?v=oFoAsYfeBA8&t=262s

Now don't worry, I'm not just out here murdering old 3 wheelers. The only parts lost on these builds were a couple cracked frames and bent forks and fenders. Plus, I just did a full nut and bolt resto and full engine rebuild on this guy below. I'll post videos to my youtube channel in the near future as penance for my wicked ways :lol:

https://i.ibb.co/MhhM3Bp/IMG-20200614-155200263-HDR.jpg

I'll post more pictures here once I get everything organized. Thanks for looking!

https://i.ibb.co/XFq1DQZ/image-png-8fa8f8363bb7580a37f66b5f29f8d911.png

https://i.ibb.co/8sVCdZq/image-png-e0e370b63dd928e73a27d889fc38fad7.png

https://i.ibb.co/yYzL8Jr/image-png-34225b606ece32b0c2cf32adca53b1eb.png

https://i.ibb.co/f8RkPCs/image-png-1c4bd656405fc6c8cde9552786af2740.png

[DAM shop]

Very nice! I like it a lot. This obviously is not a first dis you design the swing arm yourself or was it copied from another build? I didn’t bother to watch the video maybe that information was explained.

[207wheelin]

Very cool. I always wanted one of the big wheel bikes. Only thing is around here 90% of our trails are closed to motorcycles. Still it would be cool to have one for the camp roads or around the prperty. I liked the video and subscribed. Keep up the good work man.
207

[BigfootBikes]

Very nice! I like it a lot. This obviously is not a first dis you design the swing arm yourself or was it copied from another build? I didn’t bother to watch the video maybe that information was explained.I show how I built it in the video. I made the swing arm out the original rigid fork that was on the ATC. I put a suspension fork off a 185S on the front.

[BigfootBikes]

Here are a few more pictures of the progress. I will have part 2 of the build video on my youtube channel around 5 or 6 am Central time tomorrow. Thanks again for the comments and feedback.

https://i.ibb.co/5WfffYr/20180409-155206.jpg

https://i.ibb.co/rHVrLP1/20180415-172158.jpg

https://i.ibb.co/VSKh8wv/20180416-142250.jpg

https://i.ibb.co/j4d5DyK/20180421-112728.jpg

https://i.ibb.co/Wpk5bck/20180421-133511.jpg

https://i.ibb.co/CVtDkg9/20180422-103924.jpg

https://i.ibb.co/tDYSGTj/20180428-134019.jpg

[BigfootBikes]

Here is the second video in the series. I will try my best to get the next video on youtube up mid next week. I might do some riding over the Independence Day weekend instead of working, but I'll try and get something out there ASAP.
https://www.youtube.com/watch?v=3gKLVXtSfHQ&t=262s

[BigfootBikes]

Here are a few more pictures of the progress. I wasn't thinking everything through on the rigid footpegs on these things. They're downright dangerous on the ankles and shins. I will have to chop them off and weld on some normal spring loaded pegs off something in the VERY near future.


I should be able to get the next video on my YouTube channel Monday morning if I don't party to hearty over the weekend.


Thanks again for the comments and feedback!

https://i.ibb.co/tcJsrkN/IMG-20190601-140941572.jpg

https://i.ibb.co/7pn5NY8/20180428-154334.jpg

https://i.ibb.co/kBdcN03/20180504-111426.jpg

https://i.ibb.co/QmS3Wk0/20180504-190455.jpg

https://i.ibb.co/1vPXvtw/20180512-205414.jpg

[BigfootBikes]

Here is part 3 of the build video.


https://www.youtube.com/watch?v=FFyAjqvqPsM

[BigfootBikes]

I made some molds for the side panels out of that dry foam stuff folks use to put artificial flowers in, laid down some fiberglass and got dirty doing some body work. It's starting to look like a bike!

The wide rigid foot pegs have got to go ASAP though. Very very bad idea. I didn't think that one through, I reworked them and put some normal spring loaded dirt bike pegs on them tucked close to the sides of the bike.

I'm going to be busy with work for a bit but will get the video of the fiberglass and body work on my youtube channel later next week.




https://i.ibb.co/KDPM243/20180520-112822.jpg


https://i.ibb.co/9W08HwK/20180520-131411.jpg


https://i.ibb.co/p2k0MZF/20180609-140032.jpg


https://i.ibb.co/C0hyC3h/20180609-172230.jpg


https://i.ibb.co/r3sJd8f/20180617-152336.jpg

https://i.ibb.co/Gv61bd6/20180617-164902.jpg

https://i.ibb.co/Zgk5x8R/IMG-20190816-175808931.jpg

[big specht]

How many layers of fiber glass did you use ? And how did you mount them? They look good that has always been the issue with the conversion bikes is finding good side panels

[BigfootBikes]

How many layers of fiber glass did you use ? And how did you mount them? They look good that has always been the issue with the conversion bikes is finding good side panels


I have two layers of fiberglass and smeared long strand fiberglass filler on the inside and outside. Panels end up being about 3/16" thick and very tough.

As far as mounting, I cut some squares out of sheet metal and welded some bolts to them. Then bonded the sheet metal in to the fiberglass panels with another layer of fiberglass. So basically the insides of the panels have some hidden threaded studs that bolt on to some custom brackets that are bolted to the frame.

I am showing that on next weeks video on my youtube channel. A lot easier to explain that way than over text.

Thanks again.

[MrConcdid]

Hey Bigfoot,
Its coming along nicely, I watched your videos, and I have seen others that use a similar design as in the jackshaft serves many double duty such as:
pivot point for swing arm
transfer power to rear axle
Just thinking out loud, do you have any creep or parasitic loss of power, it would seem that shaft would always be spinning or at least rotating during a bounce, may be
I'm over thinking it, I do that sometimes, I am aware this is the best place to mount the sprocket for chain angle and alignment.
I have considered building a bike as well.
Thanks for Sharing

[BigfootBikes]

Hey Bigfoot,
Its coming along nicely, I watched your videos, and I have seen others that use a similar design as in the jackshaft serves many double duty such as:
pivot point for swing arm
transfer power to rear axle
Just thinking out loud, do you have any creep or parasitic loss of power, it would seem that shaft would always be spinning or at least rotating during a bounce, may be
I'm over thinking it, I do that sometimes, I am aware this is the best place to mount the sprocket for chain angle and alignment.
I have considered building a bike as well.
Thanks for Sharing

I don't notice any loss in power and notice no change when hitting bumps. It rides and feels like a normal bike. It is quite a bit quicker than with the 3 wheels. The only thing you notice is turning with the wide tires but they feel very natural once you get the feel for it.

I am recording a bunch of videos riding the thing with a camera on the handle bars and some aerial drone footage riding some pretty rough and steep trails. I'll get those videos all edited together and will post them to my youtube channel after I get all the build videos done.

Thanks again!

[BigfootBikes]

Here is the latest video of the build. I will try to get the next one on my youtube channel later this week.


https://www.youtube.com/watch?v=URM38b-Pws8

[big specht]

Big thumbs up on video. Thanks for the good explanation on how you made the side panels they look good ?

[BigfootBikes]

Here are the latest pictures. The next video will be up on my youtube channel tomorrow at noon. I'm getting close! More decals and stripes coming next week!

https://i.ibb.co/F3cMW46/20180701-172959.jpg

https://i.ibb.co/BjLmd0W/20180707-105550.jpg

https://i.ibb.co/xhSbqSf/20180707-160516.jpg

https://i.ibb.co/Vqj4ctb/20180707-195648.jpg

https://i.ibb.co/f2MDddZ/20180708-144115.jpg

[ironchop]

Great thread, nice build, great YouTube video series

Thanks!

Sent from my motorola one 5G ace using Tapatalk

[coolpool]

In my opinion, you did greater justice to that machine in doing what you did to actually restoring it as a 3-wheeler. It's so well done what's not to like:wondering Great thread and videos!

[BigfootBikes]

Here is the next video. I will try to get the final build video on youtube late next week. I am recording trail riding and drone videos of me riding this monstrosity and will get some good riding videos up within the new few weeks. Thanks again for sticking around!


https://www.youtube.com/watch?v=8rJ_J9_OkxQ&t=3s

[BigfootBikes]

In my opinion, you did greater justice to that machine in doing what you did to actually restoring it as a 3-wheeler. It's so well done what's not to like:wondering Great thread and videos!

Thank you! I really appreciate it. Ya, it really is a capable machine now. I've been taking it on some treacherous rocky trail climbs, ran it through streams and it takes it like a champ!

I am in the process of restoring a 1983 ATC110 to make up for my blasphemy on this one though :) I'll post videos of that build in the near future.

[BigfootBikes]

I made some stripes and decals for the side panels. Also got a 110 engine to put in it. Now I gotta re-make the dang stripes though. I'll post the newest video on my youtube channel later this week.

https://i.ibb.co/HrmzpgK/IMG-20190511-141135222.jpg

[BigfootBikes]

Here are the latest pictures. I will have the next video up on my youtube channel around noon central time. I am working on a couple final videos fixing stuff that didn't initially work like the ridged foot pegs and kick stand. I'll post those some time in August.


Here it is by the skinny tire Rokon Mototractor and Honda Fat Cat for tire size comparison. :naughty:

https://i.ibb.co/D9G85GW/IMG-20190717-154123482-HDR.jpg

https://i.ibb.co/pL69RJJ/IMG-20181028-121011820-HDR.jpg

https://i.ibb.co/cYDYgH5/20180812-132350.jpg

I am rebuilding a 110 engine for it so I'll need to make some new decals some day soon.

https://i.ibb.co/wwDLr27/20180715-123311.jpg

https://i.ibb.co/3BSRHwT/20180715-130143.jpg

[BigfootBikes]

Here is the latest video.


https://www.youtube.com/watch?v=UxuzZBA-ZvE

[BigfootBikes]

I took the 3 wheeler conversions and a restored 1983 ATC 110 to a car show last week to see if I could beat out some Harleys for a trophy with a little Honda. :cool:


https://www.youtube.com/watch?v=75p22Z37sAo&list=PLmU1QZjQHa1uBQFV9pDoU-T15Xlo_H-V_&index=7

[MrConcdid]

nice build and I am glad to see your channel taking off.
Good Job, keep at it. but most of all relish in the time spent with your father.

mrc_builds