The Hull Truth - Boating and Fishing Forum

Go Back   The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > The Boating Forum
Search

Notices

Random Quote: If....if if was a fifth, we'd all be drunk right now!
Closed Thread
 
Thread Tools Search this Thread
Old 06-29-2003, 07:34 AM
  #1    
Senior MemberCaptains Club Member
 
Join Date: Mar 2002
Location: FL
Posts: 14,493
Default Yamaha OX66 250hp Spark Plugs

Anyone have a handle on which spark plugs are best for a 2002 OX66 250hp Yamaha? Thanks.
First Light is offline  
Old 06-29-2003, 08:28 AM
  #2    
Senior MemberCaptains Club Member
 
Join Date: Aug 2002
Location: St. Augustine, Fl
Posts: 15,939
Default Yamaha OX66 250hp Spark Plugs

Any part store should be able to help you but DEFINITELY stick to NGK! Jap motors, Jap plugs!
Cracker is offline  
 
Old 06-30-2003, 06:39 AM
  #3    
Senior Member
 
Join Date: Jun 2002
Location: Stamford CT
Posts: 249
Default Yamaha OX66 250hp Spark Plugs

I go to the nearest yamaha dealer in my area for my plugs etc.. they come pre gapped (i do check em all anyway) and cracker is right NGK!!
t bone is offline  
Old 06-30-2003, 07:31 AM
  #4    
Senior MemberCaptains Club Member
 
Join Date: Jun 2001
Location: Boynton Beach Fl (Pursuit
Posts: 5,541
Default Yamaha OX66 250hp Spark Plugs

Get the part number, and buy them from a Pep Boys or discount auto type store. You should be able to get them for about $1.69 a plug! Boat store or Yamaha dealer will get youi for almost $3a plug. Using the part number that is in your book should get you the pre-gapped plugs. For instance take the BR9HS10, the 10 designates the pre gap.
If they only have the plugs without the last digit (BR9HS) this designates you will have to gap them. Same plug.
KevinM is offline  
Old 06-30-2003, 11:13 AM
  #5    
Senior MemberCaptains Club Member
 
Join Date: Mar 2002
Location: FL
Posts: 14,493
Default Yamaha OX66 250hp Spark Plugs

Kevin (or anyone else): The manual says BR9HS(10) and there is also a small sticker on the inside of pan just below the lower spark plug on the post side of the engine that also says BR9HS. However, the engine was last serviced (and plugs changed) by Caribee in Islamorada, one of Yamaha's larger sales and service dealers and they installed BR8HS plugs.

Anyone know the difference in the "9" and "8" numeral in the NKG spark plugs? I'm assuming one runs hotter and one runs cooler. Caribee is a large volumn Yamaha sales and service dealer and I hear nothing but good things about their service - just wondering why they would have installed BR8HS plugs rather than the recommended BR9HS? And I'm sure the reason is NOT because they were out of BR9HS's.
First Light is offline  
Old 07-01-2003, 07:40 AM
  #6    
Senior MemberCaptains Club Member
 
Join Date: Jun 2001
Location: Boynton Beach Fl (Pursuit
Posts: 5,541
Default Yamaha OX66 250hp Spark Plugs

The lower the number on NGK signifies a hotter plug. Here is the key for NGK:
B = 14mm thread
R = resister
# = heat range 1 is hottest 11 is coldest
H = thread reach 12mm
S = firing end construction S = standard center electrode
# = the pre-set gap 8mm thru 20mm (10 = 10mm or
.040"), no number = installer needs to gap
KevinM is offline  
Old 07-01-2003, 09:05 AM
  #7    
Member
 
Join Date: Nov 2002
Location: South Miami, FL
Posts: 37
Default Yamaha OX66 250hp Spark Plugs

When all else fails, go to the source:


http://www.ngksparkplugs.com/products/index.asp

Piddler
Piddler is offline  
Old 07-01-2003, 12:54 PM
  #8    
Senior MemberCaptains Club Member
 
Join Date: Mar 2002
Location: FL
Posts: 14,493
Default Yamaha OX66 250hp Spark Plugs

Got so curious why one of their larger dealers would install a non-recommended spark plug (NKG BR8HS) I finally found someone at Yamahama today who knew why, and HE said (quote): "in most applications the BR9HS is the plug we recommend in the OX66 250hp. However, if you use your engine to do a lot of trolling, the BR9HS will load up at excessive low RPM use, and in these instances, we recommend the BR8HS."
First Light is offline  
Old 07-01-2003, 01:28 PM
  #9    
Member
 
Join Date: Nov 2002
Location: South Miami, FL
Posts: 37
Default Yamaha OX66 250hp Spark Plugs

Glad you got a response from Yamaha. For the reasons you quoted from your Yamaha source, the heat range of the normal OEM plugs is sometimes adjusted to conform to the current use the engine is put to.

You must have supplied Yamaha with info we were not privy to, i.e., that you do a lot of trolling.

Piddler
Piddler is offline  
 
 
Closed Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
2002 Yamaha OX66 250hp pushbutton Fishing & Miscellaneous Items -- COMMERCIAL sellers only 5 08-02-2009 01:18 PM
Yamaha 250hp OX66 Problem magetec The Boating Forum 2 06-18-2007 09:01 PM
250hp Yamaha Ox66 Problem? John_Madison CT The Boating Forum 13 06-06-2007 10:39 AM
Yamaha Spark Plugs HeadHunt Shipyard Isl. Marine Engine Parts 2 02-20-2006 11:07 AM
1998 Yamaha 250hp OX66 Spark Plugs bunfoley1165 The Boating Forum 7 06-15-2005 04:43 PM

 



©2009 TheHullTruth.com

Powered by vBulletin® Version 3.7.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0