Piaggio nrg's not working??

[BoYSiE]

Well, i was going alone for a little ride, and about 10 mins into my journey it cut out. I tried starting it on button, but that didnt work, so i tried kick starting and still no go. I called the AA and got it home, i checked that theres a spark, all ok, then i checked petrol was getting in, again, all looked ok? Took the carb off and cleaned it, stillk would not work. I did hit a big bump about 2 mins before it cut out, dont know wheather this has anything to do with it or not. I find it wired as i thought if theres a spark and petrol thens its gotta go? Well, is there anything else i should check, as i have run out of ideas.
Thanks

[swampy]

Have you checked to see wether there is compression ??
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"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me." Hunter S Thompson
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[BoYSiE]

yes, that seems fine too?, sorry i forgot to say i checked that.

[swampy]

https://www.bikechatforums.com/viewtopic.php?t=32963

Have a look at this post re spark plug (sorry cant be arsed to write it out again)
____________________
"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me." Hunter S Thompson
"Faster, faster, faster, until the thrill of speed overcomes the fear of death..." Hunter S Thompson

[BoYSiE]

i did look at that, i had a spare plug on me at the time, i did swap it and still no go. Anymore suggestions? Thanks for the replies.

[swampy]

Could be the fuel is contaminated with water etc. Makes the plug look wet, but wont run... Best thing to do is wait for kickstart to reply lol. Sorry I cant help any more mate, but i'm out of ideas... Keep us posted though...
____________________
"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me." Hunter S Thompson
"Faster, faster, faster, until the thrill of speed overcomes the fear of death..." Hunter S Thompson

[BoYSiE]

ok thanks for the replies, ill check on this thread tomorrow morning.

[divuk83]

How did you check the compression? A simple check is to see how easy it is to kickstart it. If it is very easy to kick it over then its probably the rings or the piston thats gone. Happened to mine quite a few times over the summer. Worth trying a new plug as well just in case. Kick it over a few times as well then take the plug out, is there oil/petrol on it or is it dry?

Dave

[BoYSiE]

It wont start? not even kickstart. And i have tried a new spark plug as i said.

[divuk83]

Yes but is it really easy to use the kickstart? IE no compression from knacked rings/piston? Is petrol getting to the plug when you kick it over?

Dave

[BoYSiE]

well i have put a bore kit on it about a month ago, so piston + rings were changed. Would a problem like not in correctly or something, only occur now? ill check that out.

Also, i have accually put petrol into the bore, quickly refitted my spark plug, and still it would not go. I have also tried heating the plug.

[divuk83]

If the bore kit was fitted badly or the mixture was wrong it would kill the rings and posibly the piston as well. I have had piston rings last a few a few dyno runs then a few miles up the road, but that was due to daft compression!
What did the plug that came out after it died look like?

If it looks like this, covered in speckly bits then the rings have gone. https://www.divuk83.com/images/bike/plug.jpg

If it didn't look like that then what did it look like?

Dave

[BoYSiE]

It had a fair amount of like black stuff on it. Im going ti check the piston + rings now and see wheather that is the problem. If te rings have gone what would they look like ?
Thanks

[BoYSiE]

Ok, just checked piston, and it seems that the barrel (+ piston)is sliding from left to right in the cylinder, as i think theres a problem with the little end (if thats what the barrel goes through) and the 2 rings that go around the piston at the top, have scrapped the inside of the cylinder, wearing both the rings done and the inside of the cylinder is scratched. So would that cause the bike to not start even if theres a spark?...Anyway i guess thats the problem and ill have to fit the old 45mm standard bore one when i have someone else here to help me.
Thanks for all your replies.

If it is the little end bearing, any ideas how much that costs to fix?

[divuk83]

Yep, it wont start it theres no rings as theres no compression. Get the standard barrel back in for now. The barrel could be saveable depending on what the damage is like as you could get it re-lined if its a nicosil one and the damage isn't to bad. Probably better off just getting a new one as there not that expensive for 50's and you will need to replace the piston anyway.

Dave

[binge]

That happened to my Speedfight 100cc. It did it a couple of times so i just sold the scooter as a rolling chasses.
If you do get it repaired, try and find the cause of it incase it happens again?
Was your 2stroke oil going in ok before it happened?
Is it air cooled or Liquid cooled? and is it cooling properly?
Because you really dont want it hapening again!
You could probably take it in and get a Barrel rebore and another piston putting in. I had my 100cc sorted out for £130.

Good luck mate!
Ben

[divuk83]

Hardly seems worth repairing it as a new MHR Rep cylinder can be had for about the same cash. Who fitted the cylinder? And as Ben said its would be useful to find out why it went. Most likely it was either fitted badly or set up badly ie poor carb setup.

Dave

[BoYSiE]

Ok thanks, my dad fitted my bore kit. I didnt do anything to the carb setup? it had big jets in allready though so i thought that would be ok. It was only a cheap one, about £60 off ebay, ill stick my old one back on, and hope my rod bearing hasent gone.
Thanks for all your help.
Btw, it is air cooled.

[divuk83]

Hope the stock one goes back on OK. If its air cooled then its easier to fit and its not likely that it was overheating from the cooling that killed it. Put a new plug in with the barrel and run it for a few miles then take a look at the plug colour is so you know how its running.

Good Luck.

Dave

[binge]

If the bike kicks over easily your bottom end should be ok.
I doubt it would of been caused by carb setup although a bigger engine may require a higher air and oil mixture (i duno)
Or maybe the 70cc kit was old and on its way out any way. Did you get it new or used?

[BoYSiE]

the bore kit was new, i took it all apart today and found the the bearing in the bottom end has broke. Ill try and et a new 1 if i can and fit my old standard kit.

[binge]

Your bottom end is gone too. Did your back wheel lock up when it went because when my 100 blew the first time, the little woodruff key which holds the piston on came out and got jammed in the outlet manifold causing my back end to lock up and nearly slinging me over the bars. Second time it was ok thought, my scoot just slowed down and stoped!

Good luck mate...

Ben

[BoYSiE]

If the bearings only gone does that mean the whole thing has? My wheel didnt lock up, a piece in the bearin has only snapped, causing the piston to scrap the cylinder?

[yambabe]

I have been advised to tell you to check the reed petals. (they are located in the inlet rubber). if they have split/broken, you will have no compression or suction on the carbs, and this could be your problem.

If this is what the problem is, they are fairly cheap to buy (around £10) and easy to replace.

HTH!
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[Kye]

Did you even read the rest of the thread???? He has found out what the problem is