2 Cycle Setup on a Pipe

[Rcmaster199 at aol.com]

My experience is similar to Dave's. The 145 ran great for me at around 
74-7500 rpm on a very long pipe set-up (like a muffler) and a 16x14 std apc. It was 
absolutely stealthy sound. Very constant speed set-up BTW.

The OS160 with a 17x13 std blade runs the numbers Dave states, with a 
"cheapie" Macs 1092 pipe set fairly close to optimum

Matt K


> Subj:Re: 2 Cycle Setup on a Pipe 
> Date:4/1/2004 4:24:14 PM Eastern Standard Time
> From:DaveL322 at comcast.net
> Reply-to:discussion at nsrca.org
> To:discussion at nsrca.org
> Sent from the Internet 
> 
> 
> 
> My experience -
> 145 on muffler is ok at 7500.  With pipe, 8000+ is friendlier.
> 160 has lower timing and is ok 7400-8000 on either muffler or pipe.
> 
> Dave
> 
> ----- Original Message -----
> From: "Lance Van Nostrand" <patterndude at comcast.net>
> To: <discussion at nsrca.org>
> Sent: Thursday, April 01, 2004 12:44 AM
> Subject: Re: 2 Cycle Setup on a Pipe
> 
> 
> > Careful Randy.  Dean has good information, but these engine tuning issues
> > are not the result of one parameter.  Webras have been known to have their
> > pump pressure too high and this can contribute to midrange burble too.
> >   the tuning numbers I gave you assumed you were propped for 8000.  I
> don't
> > think the Webras run as well when propped below this.
> > --Lance
> >
> > ----- Original Message -----
> > From: <randy10926 at comcast.net>
> > To: <discussion at nsrca.org>
> > Sent: Wednesday, March 31, 2004 3:27 PM
> > Subject: RE: 2 Cycle Setup on a Pipe
> >
> >
> > > Man that describe my 145.  It is my second one and still low mileage,
> but
> > mid range is a problem.
> > >
> > > Randy
> > > > You might still wish to shorten the pipe, be on the lookout for
> > mid-throttle
> > > > hysteresis. If you are not flying at mid throttle for most of your
> level
> > lines,
> > > > you might not be looking for this. The symptom is an inconsistent
> power
> > level
> > > > when you pull back or throttle up to the same middle-stick position.
> > > > Hope this helps,
> > > > Dean

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