Piaggio NRG wont rev

benandthe · Traffic Copper Joined: 24 May 2010 Karma :

Hello,
Long time, no post! Smile

I've got an issue with my Piaggio NRG scooter;
The screws that hold the stator onto the crankcase snapped off and the stator fell off and has chewed up the inside of my flywheel.

I've since replaced the stator and flywheel, removed the old screws and replaced with all new parts.

I've now got a spark again (the wiring near the CDI/Coil pack had also died) and the bike will idle, and maybe increase by about 500-1,000rpm, but I cannot get it to rev anymore!

I've checked the jetting in the carb (Seems alright and based on all the after-market parts I have is as close to the correct jetting that I can get without getting it on a dyno), I've checked the reeds (although I'm not 100% sure that they are ok) I've checked that there is compression and that all gaskets are in place and everything is connected and bolted together.

I'm just stuck now...

Could it be the reeds in the reed block (main thing I think it could be) or possibly something else I've overlooked?

If you would like me to upload a video if it helps, just ask and I will do it asap.

Please see my signature for a list of all parts on the bike at the moment.

Thanks again!
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Sold: NRG 50cc, SR125cc, CBR125cc, Mito MK 1 125cc, Speedfight 50cc, Stomp 125cc, cbr125cc, NRG 172cc, CBF 125cc, Zip 70cc, stomp 140cc
Current: CB500 (waiting on DAS)

Nope. · World Chat Champion Joined: 16 Feb 2011 Karma :

Video would help.

I had a similar issue with my Derbi, but it was just one of the wires from the CDI. Check all the connections.
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Former: Derbi GP1 50, Sachs XTC 125, Suzuki GSXR 400 GK73A, Kawasaki ZX7R, Suzuki DR250, Yamaha RD350
Current: 2011 Yamaha XT660Z Ténéré, 2003 Yamaha YZR-R1 5PW (In Build), 2009 Kawasaki ZZR1400

HD · World Chat Champion Joined: 16 Dec 2009 Karma :

I had a similar problem with my Derbi, the CDI went.

A video would help.

(I'm not joking either Laughing

)
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Rusty '02 Vito Camper + CBR600F3

benandthe · Traffic Copper Joined: 24 May 2010 Karma :

I'll take a video tomorrow, it's a bit late to be getting the light out in the garage now and trying to get it running (the neighbours are annoyed enough as it is!)
Also I don't have a digital camera, only my mobile phone and the camera is rubbish on it...

I've already replaced the CDI/Coil pack with a de-restricted Athena one, all the electrics have been checked and are all working the way they are supposed to.

Thanks guys! Thumbs Up

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Sold: NRG 50cc, SR125cc, CBR125cc, Mito MK 1 125cc, Speedfight 50cc, Stomp 125cc, cbr125cc, NRG 172cc, CBF 125cc, Zip 70cc, stomp 140cc
Current: CB500 (waiting on DAS)

benandthe · Traffic Copper Joined: 24 May 2010 Karma :

As requested, one video, sorry for the poor quality, it's from my phone. Sad

I've tried to include just a general view of the engine/ exhaust.

One tuning company mentioned to me earlier that it might be my oils seals have been damaged when the stator came loose, can't see how but I will be buying new oil seals just to play it safe soon.

Video: https://youtu.be/H3YLFjIk0zo
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Sold: NRG 50cc, SR125cc, CBR125cc, Mito MK 1 125cc, Speedfight 50cc, Stomp 125cc, cbr125cc, NRG 172cc, CBF 125cc, Zip 70cc, stomp 140cc
Current: CB500 (waiting on DAS)

HD · World Chat Champion Joined: 16 Dec 2009 Karma :

Mine didn't sound like that. Mine rev'd but sounded like it was bouncing off a rev limiter at like 3,000 rpms.

I would post the video but I deleted it off youtube before I sold my bike Laughing

Is your throttle cable definitely connected?
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Rusty '02 Vito Camper + CBR600F3

benandthe · Traffic Copper Joined: 24 May 2010 Karma :

Yup, definitely connected and not stretched or snapped....
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Sold: NRG 50cc, SR125cc, CBR125cc, Mito MK 1 125cc, Speedfight 50cc, Stomp 125cc, cbr125cc, NRG 172cc, CBF 125cc, Zip 70cc, stomp 140cc
Current: CB500 (waiting on DAS)

Carvel · World Chat Champion Joined: 01 Jun 2010 Karma :

Timing?
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2002 Aprilia RSV1000R, Cbr600Fs, Mk1 B12, Vfr400 NC30...

Matt B: I can deal with crushed nuts to beat Ollie.

HD · World Chat Champion Joined: 16 Dec 2009 Karma :

Is your slide stuck then?

Maybe take the carb off, take it apart and rebuild it. Maybe you put something back wrong?
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Rusty '02 Vito Camper + CBR600F3

benandthe · Traffic Copper Joined: 24 May 2010 Karma :

Timing is spot on;
When I replaced the stator and flywheel, the stator came from a Piaggo NRG 50, exactly the same year/model and version as my bike is.
Flywheel is brand new, timing is spot on.
Pretty sure the slide isn't stuck, I've checked that the throttle slide and needle is opening properly when the bike isn't running, but it wont even start with no air filter so can't take it off and see if it's still moving when the bikes running, but i'm pretty sure it is.

I've made sure everything is back on properly, and double checked and triple checked. Smile

I've been off the road for 3 weeks now and it's really annoying... Sad

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Sold: NRG 50cc, SR125cc, CBR125cc, Mito MK 1 125cc, Speedfight 50cc, Stomp 125cc, cbr125cc, NRG 172cc, CBF 125cc, Zip 70cc, stomp 140cc
Current: CB500 (waiting on DAS)