GTS OWNERS CLUB

dougl65 · Posted: Sat Sep 22, 2007 10:23 pm Post subject: POP, POP, POP No.2

Well ny GTSie now has a PM pipe as well as the Polini variator. I love the performance and the noise! Very Happy

What is tiring is the continual popping and farting from the PM on the overrum. It wa amusing for the first two days but now it's just plain irritating!

PM say the casuse is the Vespa's efi being set very lean... and they recommend their TFI black box, so rather than spend the money on a Leo Vince 4road, I have ordered their TFI....

I hope it's worth it!!! Shocked

smirnoff · Posted: Sun Sep 23, 2007 4:58 pm Post subject:

It does almost eliminate the popping Wink

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PHIL....

dougl65 · Posted: Sun Sep 23, 2007 7:01 pm Post subject:

Almost is good!!!

Since I have changed the variator to the Polini and put on the PM pipe my mpg seems to have dropped from about 75 to 60, probably because I am more prone to riding it like I stole it!!

Who else has the PM black box or similar???

buddyphil · Posted: Mon Sep 24, 2007 4:11 pm Post subject:

ive got the pm box
still pops Very Happy

dougl65 · Posted: Tue Sep 25, 2007 5:53 am Post subject:

What do you think of it Phil?

Did you use the original PM settings or have you altered the fuelliing?

Mine should arrive tomorrow as my card seems to have been charged!

buddyphil · Posted: Fri Oct 19, 2007 8:09 pm Post subject:

had it set up on the dyno
as i put it on and the scoot ran crap
84 on the dyno
still pops Very Happy

dyno man said the box was set very rich
told him it was sposed to be plug and play
he said every bikes different even two identical ones
working on ten thousand pound bikes i dont doubt him

MikeHolland · Posted: Fri Oct 19, 2007 11:39 pm Post subject:

My GT has a PM, and I find the popping is worst when the scoot has not yet warmed up.

But it usually happens when I snap the throttle shut. Closing it more gently, or not completely, almost eliminates the popping.

Mike
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Vespa GTS250 Vintage Red