Hog Boys Boardtracker (Ex-Villiers)

[cobrafreak]

Re: Villiers board tracker GOOD NEWS!

I played around with a sprocket gear ratio calculator. Normal gear ratios between front and rear sprocket would be something like a 2.50 or 2.53 , and you have a .857 , which not only would be called overdrive, but very very overdrive. Normally the 4th gear on a four speed car is a 1.00, and overdrive fifth would be a sub whole number, .85 or in the neighborhood. You are set up right now so you are like taking off in 5th or 6th gear in a car. If you can reduce your front to 15-17 and raise your rear sprocket one or two teeth you will be set right.

 

[stocksucks]

Re: Villiers board tracker GOOD NEWS!

:shock: :shock: :shock:
Heck!..
Thanks a lot cobrafreak.
I've got a real problem there, because I can't weld a smaller sprocket on or else I'll loose the allignement between the clutch and the engine's pulley.
So... I just bought a 10 tooth centrifugal clutch (not with the Variable thing) that will go directly on the engine's shaft; and it's sprocket will directly engage the rear wheel sprocket.
So if it's not much to ask, could you calculate the ratio between 10 and 36 teeth?
Will it be enough?
Thanks a lot and keep rollin'

 

[cobrafreak]

Re: Villiers board tracker GOOD NEWS!

I think you are doing the right thing. I don't like the idea of welding a sprocket on because it will eventually need to be replaced and they you have a lot of work ahead of you. Better to bolt and unbolt than to weld, or in your case, replace the old clutch carrier. I calculated your new ratio with the numbers you gave and it showed a 3.6 ratio, which means for every rotation of the tire your clutch will turn 3.6 times. For comparison I fed in my bikes numbers which are 10 and 44 teeth and came up with 4.4. (math is easy with dealing with 10 ), so you will be on the steep side of things but I think it will operate. I am guestimating that your top speed will be in the neighborhood of 40-45mph. You clutch won't like the steep gear take off meaning you should go ahead and order a spare clutch to keep on hand because you don't know how long your friction material will last. It's good to have spare parts.

 

[stocksucks]

Re: Villiers board tracker GOOD NEWS!

That's cool news.
So if I get, say, a 44 or a 46 sprocket, it will be better, right?
How do you calculate the speed from there?
Thanks a lot cobra.

 

[cobrafreak]

Re: Villiers board tracker GOOD NEWS!

Stay with the 10/36 and see how hard it is for the bike to take off from a standing start without pedaling. I think you will like it. I just don't know how durable a centrical clutch is and what the limits of durability are. I run a two stroke with a manual clutch and my redline is around 7k. I can only guess that your four stroke engine is good for around 3600 rpms. You are just going to have to test it out. It's not just the wheel diameter and the final drive ratio x rpm. It's the HP and torque and weight and wind resistance too. I think a 10/36 is a good start. Get it running and then you can tweak it.

 

[stocksucks]

Re: Villiers board tracker GOOD NEWS!

Hey there.
Thanks cobra. I’ll stick to that ratio and see what happens. I think I’ll have the clutch next week. I also got another idea of using the pedaling axle to part the transmission, but I still have to think some more.
Maenwhile, I’ve assembled the throttle. It’s not a vintage piece, but I’ve shaved it a bit for low-profile look and also passed the cables through the handlebars:

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Then I built a bracket for the adjustment bolt

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And connected the cable to the throttle lever on the engine.

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It's pretty cool being able to hand control the throttle on the handle bar.
Thanks a lot and keep rollin’

 

[stocksucks]

Re: Villiers board tracker GOOD NEWS!

Hey there
Got the clutch (long live the Evil-bay)

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Now, the new devilry:
I’ll have a filling for the shaft and make a keyway to get the clutch on.
Then I’ll run a chain onto a 10 tooth sprocket that will be attached to a shaft on that crank shaft. This crank shaft will have another 10 tooth sprocket on the oposite side, running another chain to the 36 tooth sprocket on the rear wheel.
Got it? I’m allways affraid that what I write is a bit confusing..
I guess this is a solid idea..
Thanks a lot and keep rollin’.

 

[stocksucks]

Re: Villiers board tracker GOOD NEWS!

Hey there.

Since I chopped of the “thing” that held the previous clutch, I got a hole in the bike, look-wise. It was built with the measures of the H-D I posted earlier. But I forgot that this bike had 2 cilinders and mine, unfortunatelly, has only one.
So I created a lubricating device for the axle that recalls the lubrication cups of the late 1800’s and early 1900’s stationay engines.

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I’m realy diggin’ the ratty look on the bike and it’s overal appearance. I’m gonna build me a leaf fork tough.
Also sticked on the Villiers logos.
Keep rollin’

 

[ifitsfreeitsforme]

Re: Villiers board tracker GOOD NEWS!

if you sell that fork, I'd consider buying it. I have the perfect bike for it and haven't been able to find a fork I like.

 

[nick_ish]

Re: Villiers board tracker GOOD NEWS!

thats pritty sweet!

 

[stocksucks]

Re: Villiers board tracker MEDIUM GOOD NEWS!

Hey there.
I really appreciate you considering buying the fork, but I could'nt sell it to you. Maybe the pics don't show, but in fact it does'nt have a perfect allignement, so you'd be stuck with a fork that still you would'nt like..

I got the axle good but screwed up (again):


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The long shaft that is on the left should be on the right and vice-versa because one nut screws clockwise and the other counter-clockwise... When the engine revs up they tend to unscrew... DANG! (always learnin')
Now I have tho add some counter-nuts..

But still I think its coming out nice:



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Thanks a lot and keep rollin'

 

[cobrafreak]

Re: Villiers board tracker GOOD NEWS!

If they are spinning loose drill a hole through it and run safety wire. It will never come out.

 

[stocksucks]

Re: Villiers board tracker GOOD NEWS!

Hey there Cobra.
I already had a new shaft made. I'll pick it up this afternoon.
In theory this will work right? I mean, the whole thing was designed for the use of a one piece crank on a BMX. I know that the bearings will suffer much more stress and that I will have to keep constant lubrication and attention, but in principle, things will turn out ok, right?
What do you think?

 

[cobrafreak]

Re: Villiers board tracker GOOD NEWS!

I know that for super-duty applications of sealed bearing crank bottom brackets they often put two sets of bearings on the chain side to elevate flex and to give a long bearing life. Any way for you to run double bearings on the long shaft side? Another thing you could do to help the shaft to not flex is to put a tight caller over the existing shaft between the bike bottom bracket and the chain ring. The thicker the better.

 

[stocksucks]

Re: Villiers board tracker GOOD NEWS!

Thanks man.
What do you mean by caller?
Keep rollin'

 

[cobrafreak]

Re: Villiers board tracker GOOD NEWS!

I meant to say "sleeve".

 

[stocksucks]

Re: Villiers board tracker GOOD NEWS!

Cobra,
As you can see on the last pics, I've got a non stretched chain runnin from the clutch to the first sprocket. This happened because I've got no possibility of adjustment and because the connection misses by half a link.
What I did to get it a bit more streched was to put increase the number ot teeth on the sprocket.

What I've got now is:
10 teeth on the clutch
13 teeth on the 1st (left) sprocket
12 teeth on the 2nd (right) sprocket
36 teeth on the rear wheel
:lol:

Can you guess what will happen?
Thanks a lot and keep rollin'

 

[cobrafreak]

Re: Villiers board tracker GOOD NEWS!

I think it will work a lot better than the way it was set up before originally. You will know for sure after the initial test ride. If you are a half link off can you get one half link and put it in your chain to make it tighter? I have one half link on my 3/8th chain and one on my 415 to make it work right. No possible way to adjust the chain? Can you elongate the engine mounting holes on the bike so it slides to and fro so you can tighten the chain? Can you put a spring loaded idler pulley to self adjust the chain?

 

[stocksucks]

Re: Villiers board tracker GOOD NEWS!

I'm gonna try it like it is.
I still have the option of changing the rear sprocket from 36 to 44 teeth.
We had a classic car and bike show this weekend in Lisbon.
I found this and bought it



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Keep rollin

 

[stocksucks]

Re: Villiers board tracker CHOPPED!

Hey there.
I just wasn’t happy solving all the problems with the bike, and had to go get some new ones. So…
The Villiers BTR got chopped.
As I said earlier, the chain touched the frame so I had to mess with the bottom part of the triangle. While my hands where on it, I chopped all of it because I wanted to make new dropouts (correct term? - the place where the wheels shaft go):

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Now I’ve got new problems: How to build every thing (the triangle) right?
Thanks a lot and keep rollin’