Derestriction Questions

McScooterson · 13-07-2008, 20:17

As some of you know, I have a Piaggio Purejet SR50. I have a question
regarding the variator derestriction.

When the vario spacer is in, the bike will rev at 9.5k RPM, and go ~30MPH.

When the vario ring is removed, the bike will lose 1500 RPM and rev to 8k, but
the speed increase to ~50MPH.

I don't understand this completely. Where did the 1500 RPM's go? Is it possible
to get them back, and gain more speed?

Also, there is a metal plate in between the manifold and reedblock. Is this a restrictor,
or does it have another function?

K-1 · 13-07-2008, 23:09

Did you get new, lighter rollers in your vario? Something like .5 - 1g lighter should do the trick.

If the metal plate blocks the space between the holes of the manifold and the reeds then it is a restrictor, if it doesn't - then it aint one. Take it apart and see for yourself - I personally haven't had any contact with these injection engines so I don't know where the restrictors (besides the ECU and the vario) are..

tiba_karotsu · 14-07-2008, 06:27

you lost the revs b'coz you are now shifting into high gear (overdrive) with the ring out, just lighten up the rollers a bit & you'll see your revs increase & top speed go up.

McScooterson · 14-07-2008, 07:50

Nice, Thank you!

McScooterson · 14-07-2008, 16:16

Thanks guys. I will look into these things.

13-07-2008, 20:17	#1 (permalink)
McScooterson PSEUDO TUNING	Derestriction Questions As some of you know, I have a Piaggio Purejet SR50. I have a question regarding the variator derestriction. When the vario spacer is in, the bike will rev at 9.5k RPM, and go ~30MPH. When the vario ring is removed, the bike will lose 1500 RPM and rev to 8k, but the speed increase to ~50MPH. I don't understand this completely. Where did the 1500 RPM's go? Is it possible to get them back, and gain more speed? Also, there is a metal plate in between the manifold and reedblock. Is this a restrictor, or does it have another function?

13-07-2008, 23:09	#2 (permalink)
K-1 Estonian ScootRclub	Did you get new, lighter rollers in your vario? Something like .5 - 1g lighter should do the trick. If the metal plate blocks the space between the holes of the manifold and the reeds then it is a restrictor, if it doesn't - then it aint one. Take it apart and see for yourself - I personally haven't had any contact with these injection engines so I don't know where the restrictors (besides the ECU and the vario) are.. __________________ 2 stroke is pure FUN!

14-07-2008, 06:27	#3 (permalink)
tiba_karotsu OVERREV TUNING	you lost the revs b'coz you are now shifting into high gear (overdrive) with the ring out, just lighten up the rollers a bit & you'll see your revs increase & top speed go up. __________________ 2stroke tuning the Dutch way + infusion with Filipino ingenuity = OveRReV TuNinG Rev Higher, Go Faster, Race Harder, My Desire

14-07-2008, 07:50	#4 (permalink)
McScooterson PSEUDO TUNING	Nice, Thank you!

14-07-2008, 16:16	#5 (permalink)
McScooterson PSEUDO TUNING	Thanks guys. I will look into these things.