New BoardTrack Project w/Honda Engine

"There you go!, thinking outside the HUB again". Nice idea, looks like a project for marketing on that spocket adapter? Like the way everthing is falling together for you. The Worksman rims, ...gotta love 'em. Glad to see you took off about 2 lbs. of weight on that Jackshaft sprocket, "Drill it" to match the rear. The bike has a nice stance, as always I look forward to more pictures of your progress..

In order to fix the running clearance with the new sprocket, we started with a pie cut to the lower tubes and forcing a block between the lower tubes until the dimension needed and tack weld in place.


We cut away the original fender bracket and cut the upper tubes away from the seat tube.


Pie cut the upper tubes just beyond the sprocket, extended the upper backbone tube past the seat tube. Fabricated spacer to space out the upper wheel tubes and welded back in place.


Fabricated a new curved tube to attach the fender and welded between the upper wheel tubes.


Mike

As a result of the changes to the rear for running clearance the seat post was moved forward and the backbone of the bike extended.


Mike

Looks the part from behind. Once you build one with a few considerations for a motor, reduction, durable hub, etc. you see these frames were actually quite a bit different from a bicycle frame. Imagine if you had to support 40+HP!
What surprised me when I saw pics of Jeff Decker's Cyclone was how wide the rear spacing was. Nice job!
Dave
KC

Just guessing but that sucker is going to be fast. looks cool man.

__________________
http://farm3.static.flickr.com/2490/...969c483d7e.jpg

Fabricated a kick starter sprocket component. This component will secure to a pedal shaft.


We are using a piece of the roller chain that is secured to the partial sprocket.


Fabricated a new pedal shaft bracket with bushings for a 3/4" shaft.


Welded the bracket in place right behind the original bottom bracket.


Added a crank arm and pedal to one end of the shaft and slipped the shaft through the bushings.


Mike

Secured the kick starter sprocket to the pedal shaft and attached the right pedal & crank arm.


The kick starter sprocket engages the freewheel so you can rotate the pedal up to make ready to turn the engine over by "kicking" down on the pedal. The kick starter sprocket will disengage with the the freewheel after "kicking" down on the pedal.


Both the left and right crank arms are secured to the pedal shaft so you could use either pedal to kick start the engine.


We found that leaving the pedals free to rotate was actually very comfortable to position your legs and feet while riding the bike. We had planned to add a feature to lock the pedals in place, we don't feel we will need this.


Mike

Hello,
I looked at all the posting of your great job. I just found this site today after doing alot of surfing. I want to build a street legal boardtracker along the lines and theme of yours. I am retired 66 years and can do some fair fabrication. I have built hot rods, race bikes etc. I raced professional AMA when I was younger and always loved the start of motorcycle racing, which was the boardtracker. I don't want to reinvent the wheel. Your project has given me great ideas. Anything in the way of guideance and wisdom would be apprciated. Parts link etc. Thanks and what a great job. Hal Stockton, San Antonio, TX

Hal,
Welcome. Lots of great builds on the BoardTrackers part of the forum.

Mike, I thought your clutch would disengage the pedals/drive from the engine primary reduction. If so, how would you kick start it through the jackshaft without having to exceed the RPMs of the clutch?

Dave
KC

Thanks for the comments, we have had a lot of fun with this project. I guess this is why we post pictures of the progress of the build, we know there are people who can appreciate the little details of a project like this.

Be happy to add my 2 cents to your project. The first thing I would recommend is to select the engine you want to use and build a custom frame for it. We started with a bicycle frame and this has caused a little grief from time to time. Get the layout of the frame proprotionally right to the engine and wheels.

Let us know what your post title is so we can keep up with what you are doing. Good luck with the build.

Mike