Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 79 users online :: 5 registered, 0 hidden and 74 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Help with my Chainsaw bike

All non-spudgun related discussion goes here such as projects, theories, serious questions, etc. All "off-topic" posts (aka useless posting, determined by moderators) will be removed.
Sponsored 
  • Author
    Message

Unread postAuthor: MisterSteve124 » Mon Oct 29, 2007 2:35 pm

too tight? When I have it running it just starts wobbling if I loosten it then it will wobble even more. I think I just need a different gear ratio unfortunately.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: jrrdw » Mon Oct 29, 2007 6:39 pm

MisterSteve124 wrote:too tight? When I have it running it just starts wobbling if I loosten it then it will wobble even more. I think I just need a different gear ratio unfortunately.


Yep, to tight, also to straight up and down. Any slack will accumalate at the bottem causeing derailment.

Now i know that i'm conderdicting myself by saying to tight, then saying the slack derails it, but think about it.

Like i said the first time, most chains run 1/2" slack at the longest free floating streach. I see you still have the gear changing mechinisem beneath the gear rack. If it were me building it, i would remount that to run inbetween the two sprockets. That would fix your problems.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: MisterSteve124 » Mon Oct 29, 2007 7:00 pm

Well I also just figured out that I have a horrible gear ratio for this. I should have abou 14:1 and I think I have something like 2.7:1 but I would rather not try and try and make a new setup for getting the gear ratio higher. So I'll give what you said a try tomorrow and then if that doesn't work I'll have to set up something to change the gear ratio.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: iknowmy3tables » Mon Oct 29, 2007 7:33 pm

:shock: wow thats some thing,

:? uhm I don't have much experience with this man but maybe add some shrouds on both sides of the gear , f
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Unread postAuthor: MisterSteve124 » Mon Oct 29, 2007 8:07 pm

I think I might be able to somehow reposition the derailer so that the chain runs through it. I wonder if it will just get worn down the sprockets on there are plastic so I don't know what will happen to them running at high speeds.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: shud_b_rite » Mon Oct 29, 2007 11:51 pm

What are you planning on using it for? Going up hills or just assisting with pedaling?
  • 0

Airbeds... so many different uses
User avatar
shud_b_rite
1st Lieutenant
1st Lieutenant
 
Posts: 290
Joined: Tue Jan 30, 2007 7:10 pm
Location: Auckland, New Zealand
Reputation: 0

Unread postAuthor: jrrdw » Tue Oct 30, 2007 5:07 am

Just make sure that the derailer has room to float freely. Don't want it to get jammed into the other gears.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Sponsored

Sponsor
 


Unread postAuthor: MisterSteve124 » Tue Oct 30, 2007 1:56 pm

I want to not have to pedal at all. And go fast

Update: Well I tried out riding it today and it worked but I only went about 10mph (just on idling speed) and nothing really happened when I gave it some gas but I didn't want to rev it too much. And then after about 10 minutes of riding the clutch started smoking. If I just took the springs out of the clutch would that just totally disable it and then it wouldn't overheat? Because I don't really think its even working now because it was a really tight fit getting it on so it may not even be rolling on the needle bearing.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: babyJ » Tue Oct 30, 2007 6:25 pm

make sure the output shaft outta the motor is 90 degrees to the chain and make sure the gear on the output andthe gear that u are using on the bike are in line. but u cant change gears or it will come off.
  • 0


babyJ
Private
Private
 
Posts: 8
Joined: Wed Sep 26, 2007 5:50 pm
Reputation: 0

Unread postAuthor: jrrdw » Tue Oct 30, 2007 6:35 pm

Removing the springs will probly disable it all together. If your clutch is smoking, it's either pulling to much weight, (changing the gear ratio should help), or, it's not working rite to begin with, fly weights/outer drum worn???
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: MisterSteve124 » Tue Oct 30, 2007 8:05 pm

Ok I'm just gonna suck it up and change the gear ratio. I'll buy a jackshaft on ebay and mount it under the engine and I'll have to move the wheel so the sprockets are on the other side. If I'm using a jackshaft what are two size sprockets I want to use to get my gear ratio to 14:1 is that even possible? I know how to calculate the gear ratio for just 2 gears but I don't know what to do for 4 of them.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: ammosmoke » Tue Oct 30, 2007 8:18 pm

What if you just remove the clutch altogether? The wheel itself already has a mechanism that allows it to coast...


EDIT: Oh wait, duh... Because then you can sit with the engine running...
  • 0

<img>http://www.speedtest.net/result/309559995.png</img>
User avatar
ammosmoke
Brigadier General
Brigadier General
 
Posts: 1011
Joined: Wed Sep 27, 2006 10:57 am
Reputation: 0

Unread postAuthor: MisterSteve124 » Tue Oct 30, 2007 8:32 pm

Well that's what is happening now because I had to ram the clutch drum into there so hard that the bearing won't allow the drum to not spin. But still without the clutch I don't have the correct gearing. So I am just going to bite the bullet and buy a jackshaft and some new sprockets if anyone can help me calculate the gear ratios I would appreciate it.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: jrrdw » Wed Oct 31, 2007 3:06 am

Any gears you add to tension the chain wont figure into the ratio. The thing about drive gears is if you go up (more teeth) on the wheel gear, you have to go down (less teeth) on the engine gear, or it wont have the power to turn the wheel when it's pulling a load. From looking at the pictures, it's looks like the engine gear is kinda big. Count the teeth on the wheel gear and try and find a engine gear with 14 times less teeth, if that makes any sence. If you have to force a clutch drum on, something aint rite. The drum should spin freely with approx. .002 to .004 of a inch clearance. You need to pull that back apart and find out why it's jamming up. I have to tell ya, thats not much engine to pull you around so don't expect to break the land speed record even when you do get it rite. 40 CC's if your lucky.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: battlemonkey » Wed Oct 31, 2007 3:18 am

I race motorbikes and know a bit about them (I hope) and from all my knowledge the chain should always be able to move about 1cm left to right when youn push it. you will need a swicher device from a bike because as what was stated above the chain ratio will change so will the length that is required. You will need about a 5-60 ratio or tougher cluch springs so it inganges latter.
  • 0

User avatar
battlemonkey
Sergeant First Class
Sergeant First Class
 
Posts: 137
Joined: Sat Sep 22, 2007 3:42 pm
Reputation: 0

PreviousNext

Return to Non-Spudgun Related Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'