Motorized Bicycle Engine Kit Forum  

Sponsors



Go Back   Motorized Bicycle Engine Kit Forum > Motorized Bicycle > Motorized Cruiser Bicycles

Motorized Cruiser Bicycles The beach cruiser has always been great bicycles to motorize. They just look good with a motor. Use this section to share and discuss about motorizing this classic.

Reply
 
Thread Tools Display Modes
  #21  
Old 01-03-2017, 01:52 PM
mikadonovan's Avatar
mikadonovan mikadonovan is offline
Motorized Bicycle Newbie
 
Join Date: Oct 2016
Location: Anderson IN
Posts: 4
Default Re: Pedal-less acceleration?

I completed my first build a couple of months ago (49cc on a Kulana Hiku cruiser). This also is a heavy bike. I can now take off without pedaling, just by grabbing a handful of throttle and dumping the clutch. I made this possible by adding an expansion chamber (huge difference in low end torque), boost bottle and leaned out my jetting. I have found the machine is running better the more I ride it, and running a 25 to 1 mix vs the 18 to 1 break in mix has also improved performance. I have about a 100 miles on the engine at this point.
Reply With Quote
  #22  
Old 01-03-2017, 04:51 PM
Tyler6357's Avatar
Tyler6357 Tyler6357 is offline
Motorized Bicycle Elite Member
 
Join Date: Mar 2012
Location: Santa Barbara, CA
Posts: 716
Default Re: Pedal-less acceleration?

Quote:
Originally Posted by mikadonovan View Post
I completed my first build a couple of months ago (49cc on a Kulana Hiku cruiser). This also is a heavy bike. I can now take off without pedaling, just by grabbing a handful of throttle and dumping the clutch. I made this possible by adding an expansion chamber (huge difference in low end torque), boost bottle and leaned out my jetting. I have found the machine is running better the more I ride it, and running a 25 to 1 mix vs the 18 to 1 break in mix has also improved performance. I have about a 100 miles on the engine at this point.
Sweet, I knew an expansion pipe would help!

Reply With Quote
  #23  
Old 01-03-2017, 06:01 PM
LandSpeedRecord's Avatar
LandSpeedRecord LandSpeedRecord is offline
Dealer
 
Join Date: Dec 2014
Location: Tucson
Posts: 604
Default Re: Pedal-less acceleration?

The more miles you put on it the stronger it will get also as the rings wear in etc. I would guess the average CG gains 30 percent or more power in the first 300 to 500 milds as the compresion comes up and it breaks in. You can lean out the oil mix also to 32 to 1 on conventional oil. I run them at 32 to 1 right out of the box and most of my customers stay at that mix and some switch to 50 to 1 synthetic is they want to eliminate smoke and possible 2 stroke smell on their clothes commuting to work.
__________________
Lee a.k.a. LSR
http://www.speedy66.com/
Reply With Quote
  #24  
Old 01-04-2017, 02:16 AM
Tyler6357's Avatar
Tyler6357 Tyler6357 is offline
Motorized Bicycle Elite Member
 
Join Date: Mar 2012
Location: Santa Barbara, CA
Posts: 716
Default Re: Pedal-less acceleration?

Quote:
Originally Posted by LandSpeedRecord View Post
The more miles you put on it the stronger it will get also as the rings wear in etc. I would guess the average CG gains 30 percent or more power in the first 300 to 500 milds as the compresion comes up and it breaks in. You can lean out the oil mix also to 32 to 1 on conventional oil. I run them at 32 to 1 right out of the box and most of my customers stay at that mix and some switch to 50 to 1 synthetic is they want to eliminate smoke and possible 2 stroke smell on their clothes commuting to work.
What do you think of Opti2 at 100x1? I've been using this stuff for the life of my 69cc PK80 China Girl engine. I did my break in at about 90x1 and 100x1 thereafter. It seems great so far with low smoke and carbon build up. I'm at about 1900 miles.

http://www.ebay.com/itm/Opti-One-Gal...UAAOSw5cNYHL7j

Last edited by Tyler6357; 01-04-2017 at 02:55 AM.
Reply With Quote
  #25  
Old 01-05-2017, 03:26 AM
sbest's Avatar
sbest sbest is offline
Motorized Bicycle Elite Member
 
Join Date: Nov 2015
Location: Nova Scotia
Posts: 340
Default Re: Pedal-less acceleration?

The chrome is thin on these engines, not as durable as nikasil.
50:1 seemed to result in scratches. I've had better luck with 32:1.

Tyler, have you looked at your cylinder lately?

Steve
__________________
That's a mighty noisy bike you got there, it must haul a lot of ass?
Reply With Quote
  #26  
Old 01-05-2017, 05:49 AM
Tyler6357's Avatar
Tyler6357 Tyler6357 is offline
Motorized Bicycle Elite Member
 
Join Date: Mar 2012
Location: Santa Barbara, CA
Posts: 716
Default Re: Pedal-less acceleration?

Quote:
Originally Posted by sbest View Post
The chrome is thin on these engines, not as durable as nikasil.
50:1 seemed to result in scratches. I've had better luck with 32:1.

Tyler, have you looked at your cylinder lately?

Steve
Not since I replaced the head with a Fredhead about 500 miles ago.
Reply With Quote
  #27  
Old 01-05-2017, 12:42 PM
LandSpeedRecord's Avatar
LandSpeedRecord LandSpeedRecord is offline
Dealer
 
Join Date: Dec 2014
Location: Tucson
Posts: 604
Default Re: Pedal-less acceleration?

The oil mix is such a huge discussion and many have had good results with many mixes and oils. I think lot of new people are mis led by the factory double recommendation for break in is my main point, I think if you want to be super safe run 24 to 1 for a tank but many of these motors wont even start on 16 to 1 so I never use or recommend that much on a new motor. As for opti at 100 to 1 this thread is the first I have heard a problem with it so I may wonder if some pieces of debris didn't cause the scratches or something else. I suspect it is a good street mix but I do not have first hand experience.
__________________
Lee a.k.a. LSR
http://www.speedy66.com/
Reply With Quote
  #28  
Old 01-05-2017, 12:42 PM
LandSpeedRecord's Avatar
LandSpeedRecord LandSpeedRecord is offline
Dealer
 
Join Date: Dec 2014
Location: Tucson
Posts: 604
Default Re: Pedal-less acceleration?

sbest are you running opti at that ratio?
__________________
Lee a.k.a. LSR
http://www.speedy66.com/
Reply With Quote
  #29  
Old 01-05-2017, 04:41 PM
Tyler6357's Avatar
Tyler6357 Tyler6357 is offline
Motorized Bicycle Elite Member
 
Join Date: Mar 2012
Location: Santa Barbara, CA
Posts: 716
Default Re: Pedal-less acceleration?

Quote:
Originally Posted by LandSpeedRecord View Post
The oil mix is such a huge discussion and many have had good results with many mixes and oils. I think lot of new people are mis led by the factory double recommendation for break in is my main point, I think if you want to be super safe run 24 to 1 for a tank but many of these motors wont even start on 16 to 1 so I never use or recommend that much on a new motor. As for opti at 100 to 1 this thread is the first I have heard a problem with it so I may wonder if some pieces of debris didn't cause the scratches or something else. I suspect it is a good street mix but I do not have first hand experience.
Thank you for giving your option. As a dealer I thought you might know more than me about it.

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 10:11 AM.


Sponsors

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