Motorized Bicycle Engine Kit Forum  


Go Back   Motorized Bicycle Engine Kit Forum > Motorized Bicycle > Motorized Bicycle General Discussion

Motorized Bicycle General Discussion All topics regarding bicycles with engines.

Thread Tools Display Modes
Old 07-11-2010, 07:44 AM
Indianaskyhawk5 Indianaskyhawk5 is offline
Motorized Bicycle Newbie
Join Date: Jul 2010
Location: Indiana
Posts: 1
Default Questions from a new member

Hello everyone,

I bought my Dad a bike engine kit for Father's day and we're having a few issues with the build.
First off, we shortened the chain to fit his Atlas bicycle but as the back wheel turns, the tension increases and decreases. Second, I noticed that many people install an in line gas filter, is this necessary? and why?

I appreciate any advice I can get. I plan to buy another Skyhawk5 to install on my Panama Jack bicycle in the near future, so I'm sure I will have more questions to make sure the build is a complete success.
Reply With Quote
Old 07-11-2010, 08:03 AM
BarelyAWake's Avatar
BarelyAWake BarelyAWake is offline
Motorized Bicycle Elite Member
Join Date: Jul 2009
Location: Maine
Posts: 7,212
Default Re: Questions from a new member

First off - welcome to the forum! I think it's great yer doing a father & son build, what a great project for that

The chain gettin' tighter and looser is a sure sign of the rear sprocket not being perfectly centered (as humanly possible anyway), as the sprocket gets further back - the chain will tighten & the opposite for when it's looser. The kit supplied "rag joint" sprocket mount is a pain and that's a fact, but loosening the bolts, spinning the wheel and using a marker to hit the high spots, then tapping it w/a rubber mallet or wooden block helps get ya there, marking the back of the sprocket when the chain is tight helps get the first high spot, but you'll prolly have the chain off while adjusting the sprocket *shrug*

(what you cant see in this pic is my arm is braced on a chair to keep my hand from shaking, prolly better off using the chainstay to steady... mebbe drinkin' a lil less coffee than I do too heh)

As for the in-line filter... well, there's usually an in-tank screen filter attached to the petcock and that might well be enough, but many prefer a good in-line filter instead as it's easy to see if there's gunk build up and does filter better than the one in the tank. Some have experienced problems with the in line filters that have a paper element as the oil in the two stroke fuel seems to reduce flow - with that in mind I'd reco a clear one with a metal mesh in it for peace of mind, like this;

Just remember that the lil arrow on it is direction of flow - not "this side up" a common mistake as the filter does kinda look upside down when installed correctly

Good ta have ya here, lookin' forward to seen a few pics if ya get the chance

Last edited by BarelyAWake; 07-11-2010 at 08:12 AM.
Reply With Quote
Old 07-11-2010, 09:05 AM
azbill's Avatar
azbill azbill is offline
Motorized Bicycle Elite Member
Join Date: May 2008
Location: Fountain Hills, Arizona
Posts: 3,357
Default Re: Questions from a new member

excellent advice Barely

Intelligence is learning from your own mistakes,
Wisdom is learning from the mistakes of others

EZ Motorbike Dealer - Fountain Hills, AZ
EZ Motorbike of Fountain Hills
Reply With Quote
Old 07-11-2010, 10:01 AM
Venice Motor Bikes's Avatar
Venice Motor Bikes Venice Motor Bikes is offline
Custom Builder / Dealer/Los Angeles
Join Date: Mar 2008
Location: Los Angeles, CA.
Posts: 6,017
Default Re: Questions from a new member

To true the rear sprocket, I put a small zip tie on the frame with the tip sticking out across the tips of the sprocket teeth & then spin the wheel & watch (& listen) where the teeth buzz across the zip tie.
Then tap the sprocket with a soft hammer to center it & also move the zip tie closer & repeat until the sprocket spins as close as possible without touching it.
For motorized bicycle sales, service & engine kits in Los Angeles, please visit us at-

Follow VMB on facebook>>>

Follow VMB on Instagram>>>
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -5. The time now is 04:55 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2016, vBulletin Solutions, Inc.