Question about 2006 Yamaha Neos

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Ive got a yamaha neos 100,its had a new barrell/piston rebuild but did not know how many miles it had done since,ive ridden it and twice at 40 it cut out,it started again and now ride it at 30 but its very smokey now,is this a mixture problem or is it the rings,if it is rings is this a costly job

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  • Yamaha Master
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Hi, Anonymous I feel your pain you just dropped a ton of "DRACHMA" on rebuilding all or part of your engine and a couple of hours or days later it dies or locks up and you want me to tell you how much it will cost to fix. Unfortunately due to the magnitude of yesterday's solar flare the batteries in my crystal ball are dead and the circuitry in my mental telepathy headset was melted. Let me break it down for you.
1. Was the work done by an experienced trained professional technician or someone with good intentions that was not qualified to hold a wrench?
2. Was the proper break in procedure explicitly followed using the proper break in oil and changed as directed?
3. If your bike is used for off road abuse or competition there is no warranty in most cases.
4. If you have a street bike that had performance goodies installed no warranty in most cases.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
YAMAHA NEOS 100 HAYNES SERVICE amp REPAIR MANUAL eBay
OEM parts for Yamaha
YAMAHA NEO YN50FU Owner Manual
Scooters Yamaha Design Cafe English
Yamaha Neos Wikipedia

Posted on May 30, 2017

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Posted on Jan 02, 2017

herbmeister
  • 7 Answers

SOURCE: Engine cutting out when open throttle. YAMAHA NEOS 50cc MOPED

i had a simuler problem with my honda cr 250 moto-x bike it would start fine and you could keep it ticking over with the throttle(i have deliberatly unscrewed the tickover in case i come off,it will cut out) when i got on it,it would go for about 400-500 metres then splutter and die and not start again for around 5 mins. i immediatly knew it was a fueling problem. so after stripping the carb and giving it a good clean out i was baffled when i got back on and it still done the same. i then dismantled the fuel tap cleaned it all out and put it back together and tested it,it was very very slow so i unsrewed my fuel cap a little and was greated with the familur gush it should deliver. problem solved! the vent in my fuel cap had crystalised up,so the fuel was coming out but the air was not getting in,causing a vacuum and slowing down the flow and basically emptying the carb quicker than it can fill back up!!! clean your carb,fuel tap and any vents in your cap or tank. if this does not work then your bike must be over fueling or low on compression.

Posted on Sep 18, 2009

  • 19 Answers

SOURCE: my tzr125 2rk 1991 the bike splutters in every gear

gett a high preformance spark plug as i had the same problem with my bike

Posted on Apr 13, 2010

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1 Answer

How change piston rings in yamaha 250


2 or 4 stroke mate, if 4 stroke harder job, but once head off and barrel removed, you need to hone or glaze bust the bore for new rings to bed in, then make sure cleand out, jet wash it and wd 40 it, remove rings from piston and carefully fit new, it might be a good idea to file a sligth bit of the sharp inside edge of new rings, not oil control one, just comp and scraper.

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I f the barrel is pitted , you will need an oversize piston kit, and a machine shop to bore the barrel to a bigger size.

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6 Answers

Engine cutting out when open throttle. YAMAHA NEOS 50cc MOPED


i had a simuler problem with my honda cr 250 moto-x bike it would start fine and you could keep it ticking over with the throttle(i have deliberatly unscrewed the tickover in case i come off,it will cut out) when i got on it,it would go for about 400-500 metres then splutter and die and not start again for around 5 mins. i immediatly knew it was a fueling problem. so after stripping the carb and giving it a good clean out i was baffled when i got back on and it still done the same. i then dismantled the fuel tap cleaned it all out and put it back together and tested it,it was very very slow so i unsrewed my fuel cap a little and was greated with the familur gush it should deliver. problem solved! the vent in my fuel cap had crystalised up,so the fuel was coming out but the air was not getting in,causing a vacuum and slowing down the flow and basically emptying the carb quicker than it can fill back up!!! clean your carb,fuel tap and any vents in your cap or tank. if this does not work then your bike must be over fueling or low on compression.

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3 Answers

How to increase speed?


You can bore out the barrel to take a bigger piston or swap barrels from a 110 or 125. I know the 110 barrel can be taken out to take a Kawasaki 150 piston. This will need a new CDI and best to modify the exhaust too (more free flowing). I've done this with my Honda C70 and gone up to a wave 125 piston. the only thing holding me back is the 3 speed gear box but I have changed the sprockets to give higher cruising speeds.

You will need a bigger carb. Honda Dash Carb is just spot on. Its a Keihin and get an original (with the heavy plunger) not a cheap fake. They can stick open causing problems!

Good luck!

Jan 24, 2009 | 2005 Honda NF 100 Wave

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