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Date: Wed, 07 Jun 2000 18:20:10
Subject: Re: pa50 tuning
From: Mike _____
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where did u get the rev counter? how much was it? is there a pic of it on
the web?

>From: Ludo Van der Velden
>Reply-To: moped@topica.com
>To: moped@topica.com
>Subject: pa50 tuning
>Date: Wed, 07 Jun 2000 15:52:36 -0700
> >Hans Hartman's question
>Is that Polini kit NR. 119.0028?
>If so, what did you pay for this kit? I understand the pump is an extra?
>Yep, i found it new in holland paid about 8000 belgian franks for it, the
>pump is an extra, they don't make them anymore, I found mine second hand in
>good shape. The pump is a very useful extra, make's the cooling great!
> >You seem to have the lot.
>As an extra, you might reduce the crankshaft chamber's volume by adding a
>piece of metal (alloy) under in the sump (between the two crankshaft
>counterweights). This results in a better (higher) under-pressure in your
>engine, this increases the performance a bit.
> >-I know of that trick, but I didn't do it with my pa50. Why? the
>cranckshaft is the "weak"-spot, I already broke one on my other "lightly"
>tuned pa50, I polished the whole inside of the cranckhaft-chamber,and
>replaced the bearings with "C3" type bearings..
>Be sure that the 21-mm carb gets enough air, if in doubt you could fit
>Polini's air power box.
> >Well actually, that will be solved: I hope the carb wont take too much
>space so I can fit a "double" air-filter straigt on the carb, otherwise,
>I'm going too make another hole in the airbox at the bottom of the
>"standard" big thing that holds your wheel... (how do you call it in
>english?) So that I have 2 air intake's...
> >When you start adjusting the carburettor settings, begin with a too large
>main jet, and work your way down with smaller jets by trial and error.
> >Thanks for the tip!
> >I believe there was a special end-ratio kit for the PA50 too, you'd have
>too check the Polini-site for that.
> >I know, but they don't make it anymore, but that end ratio is for higher
>speed, and that's one thing I have plenty...a high topspeed is not my goal,
>I want real fast acceleration!
> >What alterations did you do to your variomatic system? Did you replace the
>centrifugal clutch spring's (3) with heavier springs (+40 percent)? Which
>weight rollers did you use?
> >I have the 6 roller version of the variomatic, I recut the vario so that
>the weights can move a longer way...I wil install heavier springs, but you
>may only do that after about 500 km's or so... I'm experimenting with
>different weight rollers, I want maximum acceleration...
> >I discovered an edge on my primary pulley, which restricted the belt
>further down. After we've machined that one off, the end speed was a bit
>faster (from 45 to 55 KM)
>We did not remove the edge entirely, because a lot of pulley axles were
>broken in the old days.
>I do know Belgium used other pulleys, but I am not sure the edge is on your
>model too.
> >Well a problem that exists is that the pulley get's the "Edge" after
>extencive use... I just bought a new one, new one's don't have an edge...
>over here.
> >Does your model have the six-roller version or the three-roller clutch?
>6 roller, but legend has it that the 3 roller should be better for high
> >The Polini kit and the expansion type exhaust you use, will shift the
>maximum torque from 5000 Rpm to 8000 Rpm, you must adjust the clutches
> >I know...a friend of mine will do that.
> >I am going to fit my PA50 with an electronic ignition unit for the Honda
>PX, as far as I can see right now, everything fits.
>When you use an electronic ignition, you can discard the flywheel, and use
>a battery ignition instead. This will cause your PA to howl to it's 8000
>(or more) rev's quicker, thus improving acceleration.
>Of course, you don't want to do that when you're going to use it on daily
>bases, because the moped stops when the battery is empty of course.
>In moped races in the Netherlands this modification is common practice, as
>all modern scooters and mopeds have electronic ignition.
> >Well, that's one thing that i might concider changing on mine...
> >This however is not the reason I want use the electronic ignition. I just
>want to get rid of those contact-breakers, and like to experiment a bit.
> >How do you measure your speed? Over here everybody uses these bicycle
>computers, which are really accurate when the set-up is done right.
> >I use a bicycle computer... I also have a rev-counter...It still needs to
>be driven in... and a rev counter helps if you don't want too screw up the
>whole thing...
>Hope this helps,
>Thxs for your comment!
> >PS:not that it's a problem but my name is not Ludo... i'm using my fathers
>email addres...
> >Hans Hartman
> >>

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