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Posted

I am a new Joyner owner. I bought a used Joyner Commando 650cc with only 25 hours on it. It lives in the mountains in Arizona. I have had it since June. Ran fine. Now it sputters especially during acceleration. Not as bad after warming it up but still sputters. Any ideas?

Posted

How long an interval between the times you drove it? Remember today's fuel has to be stabilized if the toy is not used regularly. If it was a long time, more than a month or two, I would first try running some injector cleaner in the fuel. Then move on to the tough stuff, Is it electrical or fuel related?

rocmoc n AZ

Posted

How long an interval between the times you drove it? Remember today's fuel has to be stabilized if the toy is not used regularly. If it was a long time, more than a month or two, I would first try running some injector cleaner in the fuel. Then move on to the tough stuff, Is it electrical or fuel related?

rocmoc n AZ

Another possibility is water got into your tank via condensation from the temperature going up and down, during my flying days, they taught me to alway keep the tank full to prevent this. If you have rodents around, and you probably do in the mountains, when it's not being used, put a few moth balls or urinal cookies in or around it, or so I hear.

Posted

How long an interval between the times you drove it? Remember today's fuel has to be stabilized if the toy is not used regularly. If it was a long time, more than a month or two, I would first try running some injector cleaner in the fuel. Then move on to the tough stuff, Is it electrical or fuel related?

rocmoc n AZ

I usually try to drive it every weekend. the sources of gas are sparce up there in the mountains so, yes, the gas does get old. I have tried some fuel stabilizer and the Mystery Oil brand stabilizer. any other products that you would recommend? Does this sound like a carberator problem? What would make you think it is electrical? it has the battery it came with and the other electrical things seem to be working. Does it need a tune up? In my jet ski and snow blower (I used to live in Chicago) I would take out the spark plugs and spray carb cleaner in there. would this help?

thanks for your input

Posted

Another possibility is water got into your tank via condensation from the temperature going up and down, during my flying days, they taught me to alway keep the tank full to prevent this. If you have rodents around, and you probably do in the mountains, when it's not being used, put a few moth balls or urinal cookies in or around it, or so I hear.

There are mice where I am but I don't see any signs or droppings around the vehicle. If there is condensation in the tank then what do you recommend?

Posted

You have injector which are much more reliable than a carb. Get some injector cleaner and put it in the tank per the directions on the bottle. After that start checking connections problems. Start at the fuse box, take it off and check the back also, and carry on thu-out the wiring. Electrical problems are very hard to find!

rocmoc n AZ

  • 2 weeks later...
Posted

You have injector which are much more reliable than a carb. Get some injector cleaner and put it in the tank per the directions on the bottle. After that start checking connections problems. Start at the fuse box, take it off and check the back also, and carry on thu-out the wiring. Electrical problems are very hard to find!

rocmoc n AZ

Thanks! Will try injector cleaner. And checking electrical. Will let you know

Posted

Thanks! Will try injector cleaner. And checking electrical. Will let you know

Check your gas filter too. Actually I would do a flow volumne test on teh pump itself. When you accererate, your fuel/oxygen ratio goes up and if the filter was plugged, it might run fine crusing but when you get on it, it starves for fuel. Keep the spark plug wires seperated by pairs. the 2 out of one coil can be together. Also block them up so they don't touch any metal of the engine. If wires were bad you could get some cross talk between them and a stronger spark is required for acceleration so slight cross talk could only be showing up on acceleration.

Lenny

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