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General => Technical | How To => Topic started by: VenoxNelly on March 31, 2011, 11:56:16 PM

Title: Barely runs at high RPM
Post by: VenoxNelly on March 31, 2011, 11:56:16 PM

I bought my wife this 2006 Venox 250 as her first bike. When I bought it, the fuel was so bad it barely ran without the choke full on. I emptied and cleaned the tank with fresh fuel and alcohol and let it dry out. I added fresh fuel, pulled the carbs and cleaned everything, and threw new plugs in it. It idles fine, but bogs out under acceleration, it barely goes 40mph. I am stumped.

Title: Re: Barely runs at high RPM
Post by: Hoolander2 on April 01, 2011, 03:56:02 AM

Could be a dirty air filter?? 

Title: Re: Barely runs at high RPM
Post by: VenoxNelly on April 01, 2011, 03:00:53 PM

It doesn't seem terrible. Against my better judgement, I blew it out carefully with compressed air, but it revs fine in neutral. It seems to be pulling air fine, but seems to be running out of fuel. I'm working on locating the fuel filter. I didn't see one when I pulled the carbs to clean them.  I can't find parts for this thing in Minnesota, so it's a little tricky.

Title: Re: Barely runs at high RPM
Post by: TechGuy on April 01, 2011, 06:02:41 PM

Call Bob Hedstrom at ScootervilleMN

About Scooterville

From the website: http://scootervillemn.com/ (http://scootervillemn.com/)

Scooterville is Minnesota’s only full-service scooter shop and showroom featuring new Vespa, Piaggio, Kymco, and Genuine scooters. We also specialize in vintage Vespa and Lambretta scooter service for the Minneapolis and St. Paul areas and beyond.

Hours Of Operation:
Tue-Fri 11:00am to 6:00pm
Saturday 10:00am to 4:00pm
Closed Sundays and Mondays.

612-331-SCOOT (612-331-7266)

We are located at 904 19th Ave S, Minneapolis, MN 55404.

Title: Re: Barely runs at high RPM
Post by: VenoxNelly on April 11, 2011, 08:23:02 PM

Still no fix. I have removed and cleaned the carbs completely, even flushed the tank. The Venox doesn't have a fuel filter, and the petcock flows fuel. I reset the mixture screws to 2.5 turns out from seated, and it's worse than before. Now it seems to run super rich, when it will start.

Title: Re: Barely runs at high RPM
Post by: marioG on April 24, 2011, 07:37:06 PM

jet size, open air filter? is it serial?

has anyone played with carb before you?

Title: Re: Barely runs at high RPM
Post by: VenoxNelly on April 24, 2011, 07:51:31 PM

I don't know what you mean by serial. The bike is stock, and I just bought it, so I have no idea what's happened to it. I did find that the floats were set too high causing the richness and no start issue. After resetting the floats, it starts and idles like a champ again, it just falls on it's face like before under any throttle past 1/4 or so. Slides looked good and move freely, diaphragms seemed good.

Title: Re: Barely runs at high RPM
Post by: CROSSBOLT on April 24, 2011, 08:57:08 PM

Make sure the tank vents when fuel is being used.....only thing that has not been mentioned yet.

Karl

Title: Re: Barely runs at high RPM
Post by: VenoxNelly on April 24, 2011, 09:03:12 PM

Tank vents. I've checked the vent in the tank and evap hoses. I even rode it with the gas cap off.

Title: Re: Barely runs at high RPM
Post by: marioG on April 25, 2011, 04:41:15 AM

spark plug reading?

rich...check jet size...

compresion...

Title: Re: Barely runs at high RPM
Post by: VenoxNelly on April 30, 2011, 09:31:02 PM

New plugs. They don't appear rich or lean. Jets are all stock, as is the bike. Compression is even on all cylinders, and within spec.

Title: Re: Barely runs at high RPM
Post by: marioG on May 01, 2011, 07:16:24 AM

valve clearance?
or cdi problem........
wrong spark plug, too big jet, think u got rich mixture.....
or head meltdown....