Motorized Bicycle: Engine Kit Forum  

Sponsors
Bicycle Sales & Service, Bicycle Engine Kits in Los Angeles
Custom Motorized Bicycle Sprockets
Motorized Bicycle Engine and Parts
Biggest selection of motors. Most orders ship out same-day!
Pirate Cycles Performance Motors
THE BICYCLE ENGINE KIT AUTHORITY! 6 MONTH WARRANTY!
Monark Springer Forks



Go Back   Motorized Bicycle: Engine Kit Forum > Motorized Bicycle > Motorized Bicycle General Discussion
Reload this Page lean or rich help/
Register FAQ Calendar Mark Forums Read

Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles

Reply
 
Thread Tools Display Modes
  #1  
Old 07-29-2009, 12:35 AM
gohst ryda gohst ryda is offline
Motorized Bicycle Newbie
  
Join Date: Jun 2009
Location: australia
Posts: 13
Default lean or rich help/
with my expansion chamber added to my 69cc i need more top end
thew plug is black, do i need more fuel getting in or do i need to add more oil????
im confused?
Reply With Quote
Sponsored Links
  #2  
Old 07-29-2009, 01:26 AM
Pablo's Avatar
Pablo Pablo is offline
Master Bike Builder & Forum Sponsor
  
Join Date: Dec 2007
Location: Duvall, WA PNW
Posts: 3,282
Default Re: lean or rich help/
How much oil are you running?

How are you checking the plug? (best is after a hot hard run)

When someone is talking about tuning lean/rich refers to your air/fuel mixture (not the oil)

Sounds like you might be slightly (fuel) rich. What notch are you running?
Reply With Quote
  #3  
Old 07-29-2009, 01:31 AM
NunyaBidness's Avatar
NunyaBidness NunyaBidness is offline
Motorized Bicycle Elite Member
  
Join Date: Jun 2008
Location: memphis tn
Posts: 850
Default Re: lean or rich help/
this post should help answer some questions for you, http://motorbicycling.com/f30/how-re...html#post89518
has pics too
__________________
"I would rather be exposed to the inconveniences attending too much liberty than to those attending too small a degree of it." - Thomas Jefferson
Reply With Quote
  #4  
Old 07-29-2009, 03:10 AM
Sydneysider's Avatar
Sydneysider Sydneysider is offline
Motorized Bicycle Elite Member
  
Join Date: Mar 2009
Location: Sydney
Posts: 189
Default Re: lean or rich help/
Blocked or restricted mufflers can make plugs black just like too rich fuel mixtures. If the problem occurred just after you put the expansion chamber on, Id say it would be that..
__________________
"....dunno what I did to my engine the other day but now my rear tyre wears out real quickly..."
Reply With Quote
  #5  
Old 07-29-2009, 11:14 AM
freewheeling frank freewheeling frank is offline
Motorized Bicycle Elite Member
  
Join Date: Mar 2009
Location: ridgway colorado
Posts: 415
Default Re: lean or rich help/
sounds like your running to rich, or too high oil to fuel ratio
Reply With Quote
  #6  
Old 07-29-2009, 11:23 AM
Pablo's Avatar
Pablo Pablo is offline
Master Bike Builder & Forum Sponsor
  
Join Date: Dec 2007
Location: Duvall, WA PNW
Posts: 3,282
Default Re: lean or rich help/
It's pretty common to be forced to re-jet when installing a tuned expansion chamber, it's what tuning is all about.
Reply With Quote
Reply

« Previous Thread | Next Thread »
Thread Tools
Display Modes
Linear Mode Linear Mode

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 08:23 PM.
Sponsors
Shifting Kits For Motorized Bicycles and More
Sportsman Flyer Bikes and Accesories
Phantom Bikes
THATS DAX!
AUSTRALIA Home for Bicycle Motors, Parts and Chainless Bicycles
gasbike.net
BikeMotorKit.com
Contact Us - Motorized Bicycle Engine Kit Forum - Archive - Top

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2012, vBulletin Solutions, Inc.
Motorized Bicycle Engine Kit Forum