if anyone can help, would be appreciated.
just got an '06 joyner 800. 50 miles on machine. pretty much brand new. carbeurated model. awesome machine. great suspension.
one issue...motor seems to start blubbering around 4200 rpm. almost as if there is a rev-limiter. it's keeping me from really getting into a power-on mode.
the manual doesn't really cover much as far as adjustments to carb. nor the ignition system.
i read in another post about switching vacuum lines. any pics or more specific?
this cart is used for desert riding, hardpack, no dunes.
thanks for your help.

In a carb there are 3 things working in combination for the machine to progress smoothly thru the powerband. Your idle and up to about 1/4 throttle is controlled by the pilot jet. From about 1/4 throttle to 3/4 is controlled by the needle. From 3/4 to full is controlled by your main. If you can not achieve full power then I would suggest that you need to have it rejetted. It may even be getting too much fuel and loading up...which the symptoms mentioned indicate. I don't think it is starving.

Glade

Check the FB8 service manual. The carb is used on the 800 Roketa types and may be the same as yours. The manual is a download "Sticky" at the top of this section.

As far as vacuum lines. As I recall, the post was about moving the secondary vacuum line from the port at the rear of the carb to the port on the front, next to the secondary depression chamber (vacuum unit), but I thought that was only early models. This was to get the secondaries to open more efficiently. Make sure that the vacuum lines are properly connected and that there are no air leaks in these lines or in the PCV line connected to the intake manafold.

You can check your secondary actuation with a hand held vacuum pump like the MityVac. I believe this process is covered in the service manual download.

Also verify that your fuel filter is clean and free flowing to the fuel pump. A partially clogged filter will allow an engine to run "normally" up until it cannot flow enough fuel to meet demand. Then it will act as you described. Bypass it to check it out.

HTH...mick

thanx for the replies. i am trying these suggestions. this is my first machine with an automotive-type carb. it's a bit overwhelming when i'm used to a mikuni or keihin-type carb.
any other suggestions are welcome also.
thanx again.

thanx guys. changed the gas, cleaned the carb, checked the hoses...holy haulin' a*#!!! THAT'S what i had hoped for when i bought this machine.
thanx again.