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RPM Drop/Bosch Spark Plugs

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Mar 04, 2007 12:16 pm Post subject: RPM Drop/Bosch Spark Plugs

Mark:



Eric Tucker, Rotax two and four stroke "guru" explained to us in the 

last class I attended a year ago, that Rotax had a difficult time 

maintainer suppliers for any length of time.  For example, the 

question was asked, "Why doesn't Rotax put fuel injection on its 912 

series engines?"  Answer was, lack of a supplier that would stay the 

course.  It cost a great deal to certify an engine and its 

accessories, which does not affect us UL and experimenters, but does 

cost them a mint for their certified line.  Uncertified parts for 

Rotax are the same as certified except the  certified part has a 

serial number to track it, and ours don't.



Rotax has been using NGK plugs since the very early years.



I had good luck with Bosch WR4CP Platinum plugs and metal jacketed 

Boxch plug wires for a 4 cyl Volvo, about 1975 vintage.  Back in the 

mid 80's that would make two sets of wires for a 447.  Now it will 

make one set of wires for a 503 or 582.  Probably still available and 

cheaper than Rotax supplied parts.  This plug worked great on my 447. 

Never fouled another plug after I started using them and they lasted a 

very long time.



john h

mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

DAquaNut(at)aol.com
Guest

Posted: Sun Mar 04, 2007 3:13 pm Post subject: RPM Drop/Bosch Spark Plugs

John,

  

  

       My 447 came from with factory with  BR8ES  and that is what my manual recommends.

  

  

              Ed



AOL now offers free email to everyone.  Find out more about what's free from AOL at AOL.com. 

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Bob Dresden

Joined: 10 Jan 2006
Posts: 11
Location: Oak Creek, Colorado

Posted: Tue Mar 13, 2007 6:07 pm Post subject: RPM Drop/Bosch Spark Plugs

 	  Quote: 	
		  Howdy Kolbers, Bob Dresden here, a long time lurker on the list.  Just catching up on my mail and noticed this discussion on fuel injection.  Hard to accept that argument, as HIRTH has been offering FI for awhile, and O Yes, it's built by Bing.  I'll try to send a pic. 

      PS Lord willin, I'll be the guy at MV this year trying to beg a ride.



       Bob Dresden..Kolbless in Co



 Mark:



Eric Tucker, Rotax two and four stroke "guru" explained to us in the 

last class I attended a year ago, that Rotax had a difficult time

maintainer suppliers for any length of time.  For example, the

question was asked, "Why doesn't Rotax put  fuel injection on its 912

series engines?"  Answer was, lack of a supplier that would stay the

course.  It cost a great deal to certify an engine and its

accessories, which does not affect us UL and experimenters, but does 

cost them a mint for their certified line.  Uncertified parts for

Rotax are the same as certified except the  certified part has a

serial number to track it, and ours don't.

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