Black Spark Plug - KawiForums - Kawasaki Motorcycle Forums
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 12-04-2012, 12:58 AM Thread Starter
Join Date: Jan 2009
Location: Asheville area, NC
Posts: 969
Black Spark Plug

Ok, so for a little Christmas project this year I'm probably going to tear down my crf70. When I got it the plug was black and a little oily, so I changed the oil and put a new one in and adjusted the valves. It has a hard time starting in the cold (even at 60 degrees) so I checked the plug again and its black and oily again. Wondering if it is actually the rings before I start tearing into the engine. I probably need to clean the carb up so maybe that will help with the starting. After I put the new plug in earlier this year it would start up just fine even in the cold but after the oil and shit gets on the plug it can't really get a good enough spark, right?

If I have to do some engine stuff I would rather try it on this little 70 before I might have to do it on either of my bigger bikes. Part of why I got the thing was to screw around with it. Is there another way to tell if the rings are bad?

Originally Posted by FightingFalcon View Post
All I'm saying is that our trannys are designed to handle the load (yea, I just said that)
J-moges is offline  
Sponsored Links
post #2 of 3 (permalink) Old 12-04-2012, 01:07 AM
Core Member
goingtoscotland's Avatar
Join Date: Feb 2007
Location: On an intergalactic cruise, in my office
Posts: 28,589
Leak down test

2005 ZX-10R Street and Track Whore

goingtoscotland is offline  
post #3 of 3 (permalink) Old 12-04-2012, 08:46 AM
Jr. Member
sckrocodile's Avatar
Join Date: Sep 2012
Location: Charleston, SC
Posts: 67
you can get a compression gauge and measure you compression and record the numbers then drop about a table spoon worth of oil in each cylinder, wait about 30 sec. then check compression. If it significantly increases with the oil then your rings are bad. But if your tearing apart the motor I know personally I'd never tear into a motor without replacing piston rings and a bearings, so why not just replace them im sure even if it's got low hours it's still got some wear and a refresh is only going to give you more power.

The old people seem to be worse than the teens texting, I say once your 60: driving test every year.
sckrocodile is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the KawiForums - Kawasaki Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
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
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome