Motorized Bicycle Engine Kit Forum  

Sponsors



Go Back   Motorized Bicycle Engine Kit Forum > Bicycle Motor > 4 Stroke Bicycle Engines & Kits

4 Stroke Bicycle Engines & Kits 4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine

Reply
 
Thread Tools Display Modes
  #1  
Old 12-28-2016, 01:55 PM
ultralight01's Avatar
ultralight01 ultralight01 is offline
Motorized Bicycle Elite Member
 
Join Date: Oct 2016
Location: Hood River, Oregon
Posts: 186
Default Finally, I'm settled on what I'm building.

I've gone back and forth between the 79cc, 212cc, a huasheng, and even a Briggs 3hp engine. I have a 212cc predator, but after some discussion with most of the members on this forum it would be rather difficult for a 15 year old (me) to dream of getting such a homebuilt motorcycle legal. For reliable transportation and relatively low cost, it's not worth it st the moment.

Plan is, use the 79cc, put a 33cc sticker on it, and call it a motor assisted scooter. They are legal in Oregon. Add lights and don't be a retard on the road.

I will use a mountain bike, upgrade the wheels, front disc brake, jackshaft disc brake, gear reduction jackshaft plate from GTC, and various jackshaft parts I have. Trying to go for a 11:1 ratio if that will work, I hardly weigh 130lbs.
Governor will be removed. Homemade exhaust, new air filter, drilled jet.

Im undecided on the chain size, but I have 6ft of #41 so I will probably use that. #35 chain for the jackshaft, maxtorque clutch (I already own most of the jackshaft pieces)

Budget $900. The cost will likely be less if I'm thrifty.
Reply With Quote
  #2  
Old 12-28-2016, 02:27 PM
ultralight01's Avatar
ultralight01 ultralight01 is offline
Motorized Bicycle Elite Member
 
Join Date: Oct 2016
Location: Hood River, Oregon
Posts: 186
Default Re: Finally, I'm settled on what I'm building.

IMG_3695.JPG
Here's some proof.
Reply With Quote
  #3  
Old 12-28-2016, 03:35 PM
TheNecromancer13 TheNecromancer13 is offline
Motorized Bicycle Elite Member
 
Join Date: Jan 2015
Location: Portland, Oregon
Posts: 376
Default Re: Finally, I'm settled on what I'm building.

I'd gear it 13:1 instead of 11:1 if I were you. When I built my first predator bike (not the one you saw) it was geared at 11:1 and it didn't have nearly enough power. I'm 155 lb and 13:1 is just barely enough, and I wish it was a little more.
Reply With Quote
  #4  
Old 12-28-2016, 03:37 PM
ultralight01's Avatar
ultralight01 ultralight01 is offline
Motorized Bicycle Elite Member
 
Join Date: Oct 2016
Location: Hood River, Oregon
Posts: 186
Default Re: Finally, I'm settled on what I'm building.

13:1 it is. Thanks for clarifying, wasn't sure if that gearing was more for a heavier person or not.
Reply With Quote
  #5  
Old 12-28-2016, 10:01 PM
MEASURE TWICE MEASURE TWICE is offline
Motorized Bicycle Elite Member
 
Join Date: Jul 2010
Location: CA
Posts: 1,828
Default Re: Finally, I'm settled on what I'm building.

I have a Briggs 3.5 hp 9000 series which is used and in good condition that I'll be using with 14:1 ratio on a 26 inch wheel bike that weighs 130 lbs and my self the same.

My more worn out Briggs 3 hp 8000 series I was always using 20:1 ratio and less than that and it would no do the trails as well, as it is only legal off road and I ride it there.

Close to trying it out again with the switched engine an see how it works.
Reply With Quote
  #6  
Old 12-29-2016, 01:13 AM
ultralight01's Avatar
ultralight01 ultralight01 is offline
Motorized Bicycle Elite Member
 
Join Date: Oct 2016
Location: Hood River, Oregon
Posts: 186
Default Re: Finally, I'm settled on what I'm building.

Hopefully this will provide reliable transportation, look cool, and maybe be able to hit a few trails.
Reply With Quote
  #7  
Old 12-30-2016, 08:14 AM
cannonball2's Avatar
cannonball2 cannonball2 is offline
Motorized Bicycle Elite Member
 
Join Date: Oct 2010
Location: Colonial Coast USA.
Posts: 3,399
Default Re: Finally, I'm settled on what I'm building.

16:1 is a good overall ratio. Decent bottom end with a top just shy of 30. I have run 14:1 also. Good if hills don't factor in.
Reply With Quote
  #8  
Old 01-04-2017, 12:53 PM
ultralight01's Avatar
ultralight01 ultralight01 is offline
Motorized Bicycle Elite Member
 
Join Date: Oct 2016
Location: Hood River, Oregon
Posts: 186
Default Re: Finally, I'm settled on what I'm building.

I'm adding everything up, looks like all parts to finish the bike. Looks like parts and the engine total will be $500 max.
I'm trying to decide if I should use my commuter Schwinn sierra frame, or I could get a classic Schwinn cruiser frame. Which would be more comfortable? That's what I'm trying to figure out
Reply With Quote
  #9  
Old 01-10-2017, 01:49 PM
ultralight01's Avatar
ultralight01 ultralight01 is offline
Motorized Bicycle Elite Member
 
Join Date: Oct 2016
Location: Hood River, Oregon
Posts: 186
Default It's here...

IMG_3952.JPG
It's here! This thing is huge with all of the stock crap on it. Time to strip it and remove that governor.
Reply With Quote
  #10  
Old 01-10-2017, 03:49 PM
cannonball2's Avatar
cannonball2 cannonball2 is offline
Motorized Bicycle Elite Member
 
Join Date: Oct 2010
Location: Colonial Coast USA.
Posts: 3,399
Default Re: Finally, I'm settled on what I'm building.

Its not that big when the stuff is removed. I put one in a cruiser frame.
Reply With Quote
Reply

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 01:17 AM.


Sponsors

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
MotorBicycling.com