[F500] Indexing

[Chuck Voboril]

Richard,

Thanks, I was curious where you guys think you ought to be indexing your 
plugs.

You say "aim the gap to the carbs".
Does anybody else agree with that and why?

When does the sparkplug gap see the carbs or intake port?

Chuck





>From: "Richard Schmidt" <reddevilsix at msn.com>
>Reply-To: f500 at f500.org
>To: <f500 at f500.org>
>Subject: Re: [F500] Indexing
>Date: Sun, 15 Jul 2007 13:56:31 -0500
>
>Chuck,
>
>Look at the pattern on your plugs.  A better indication is to look at the
>top of your piston. The part of the piston that is washed clean is the
>direction you want to face your plug.
>You want the open side of the plug facing the direction of the incoming
>fuel/air mixture. On the Kawasaki, that direction was towards the carbs.
>
>The Rotax must have a better swirl pattern as I am not seeing pattern on my
>plugs and I don't have a tool to inspect the top of the piston.  Usually 
>the
>piston inspection is conducted after a melt down.  I don't plan on any of
>those soon.
>
>Richard
>
>----- Original Message -----
>From: "Chuck Voboril" <cvoboril at msn.com>
>To: <f500 at f500.org>
>Sent: Sunday, July 15, 2007 10:50 AM
>Subject: [F500] Indexing
>
>
> > So what port are you guys indexing the plug gap towards?
> >
> > Seems like lotsa choices: intake port, exhaust port, a number of 
>transfer
> > ports.
> >
> > Chuck
> >
> >
> >
> >
> >
> > >From: Chris Reinhardt <chrisareinhardt at verizon.net>
> > >Reply-To: f500 at f500.org
> > >To: f500 at f500.org
> > >Subject: Re: [F500] resistor plugs
> > >Date: Sat, 14 Jul 2007 22:11:23 -0400
> > >
> > >Richard from expereince, I can tell you in a 2 stroke motor indexing
>helps
> > >a whole bunch in reading the plugs also..
> > >
> > >CR
> > >----- Original Message ----- From: "Richard Schmidt"
><reddevilsix at msn.com>
> > >To: <f500 at f500.org>
> > >Sent: Saturday, July 14, 2007 4:17 PM
> > >Subject: Re: [F500] resistor plugs
> > >
> > >
> > >>Dave,
> > >>
> > >>I am surprised to hear you say that indexing did not make a 
>difference.
>I
> > >>had the luck of working with a guy who used to work for Kawasaki when
>they
> > >>were racing snowmobiles and he said that they had found it to make a
> > >>difference.  Also I had a conversation with Darcy Ewing (snowmobile
>racer
> > >>for AAEN) and he also indicated that I should be indexing my plugs.
> > >>
> > >>What way did you face the open gap ?
> > >>
> > >>Richard
> > >>
> > >>----- Original Message -----
> > >>From: "Dave Phaneuf" <jimslawnshop at comcast.net>
> > >>To: <f500 at f500.org>
> > >>Sent: Thursday, July 12, 2007 5:31 PM
> > >>Subject: [F500] resistor plugs
> > >>
> > >>
> > >>>A few years back when I had access to a Land & Sea dyno I tried 
>several
> > >>>things
> > >>>on a Kaw engine. Played with timing , fuel, oil pump output,
> > >>>jetting......
> > >>>One of the things tried were a few different spark plugs, never could
> > >>>tell
> > >>>one bit of difference, not even a hint.. Big gaps, indexing, little
>gaps
> > >>>"race" plugs, all lead to nothing. I don't even bother to gap the
> > >>>things any more, take em out of the box eyeball the end and stick
> > >>>em in.
> > >>>Given a good enough dyno in a lab somewhere maybe one of those 
>engineer
> > >>>types could find a difference, wouldn't bet on being able to measure 
>it
> > >>>with lap times.
> > >>>Dave Phaneuf