Problem Surging 257cc By damin69 (Read 4,034 times)

[damin69]

Ok guys I think I found my problem. And it would be Vacuum related. So here is my problem. The tube from the Airbox to the Carb came off. Now I try putting it back on but when I tighten down the clamp it slides back off the carb. What can I do to get this to fit on the carb tighter?

[Alleyoop]

Daim69,
Go to the hardware store and get the a Wire Clamp, they usually have two wires with a screw to tighten it down. The Carb inlet has a couple of groves so the wire clamp will hold on. I know what you mean with the Flat clamps they are to wide and there is not much on the Air Inlet side of the carb to really get a good grab.
Alleyoop
Like this:

[damin69]

Thanks Alley. I will give that a try.

[damin69]

Well I was never able to find a place to that has them Wire clamps in the size that will fit. What I did do it put a wider clamp on. Now here is the kicker and could really be a part of why I had some of the surging. I was working on making sure all of my hoses and stuff are tight. Well in the process the throttle cable moved. I was looking and heck the 2 screws that hold the bracket had loosened up so the cable was moving. Heck that could have been part of my surging issue also.

[scooterran]

? Are you using a remote to start your scoot ? If you are , make sure that the key is all the way on..... That is how my scoot was acting before I realized that the key wasn't all the way on.

[damin69]

Apr 24, 2011 21:32:37 GMT -6 scooterran said:

? Are you using a remote to start your scoot ? If you are , make sure that the key is all the way on..... That is how my scoot was acting before I realized that the key wasn't all the way on.

There is not Remote start or Alarm system on this bike.

[ladycat34]

damin69, Had the same type of problem with my 54b 250. It has the 257cc motor. Husband tried the electric fuel pump, the rerouting vacuum, cleaning carb, nothing worked for long. I tried to tell him it was acting like there was something in the tank getting sucked up into the fuel line, but would he listen to a WOMAN? Not till he'd replaced every thing but the carb did he pull off the fuel line from the bottom of the tank itself and see if fuel would drip from the line. NOTHING!! He tried sucking, yeah with his mouth cause we were now on the side of the road, and got a dribble. He BLEW into the line, got restricted flow first, then a giant bubble in tank, then gas pouring from line freely. Made it home where he pulled the tank and found the manufacturer had used SILICONE around the fuel gauge seal and it had degraded and was in pieces in the tank. It would get sucked up over the opening and cause me to stall. Then after some sloshing around with us working on the bike as well as losing the suction from the pump, it would work free. Dug out the silicone and haven't had a bit of trouble out of her since. Have 9,000 miles on her in 2 riding seasons, replacing rollers with sliders and installing new belt in the coming weeks, ordered from over seas so you know how that goes. Good luck and happy riding!

[damin69]

Apr 26, 2011 11:34:28 GMT -6 ladycat34 said:

damin69, Had the same type of problem with my 54b 250. It has the 257cc motor. Husband tried the electric fuel pump, the rerouting vacuum, cleaning carb, nothing worked for long. I tried to tell him it was acting like there was something in the tank getting sucked up into the fuel line, but would he listen to a WOMAN? Not till he'd replaced every thing but the carb did he pull off the fuel line from the bottom of the tank itself and see if fuel would drip from the line. NOTHING!! He tried sucking, yeah with his mouth cause we were now on the side of the road, and got a dribble. He BLEW into the line, got restricted flow first, then a giant bubble in tank, then gas pouring from line freely. Made it home where he pulled the tank and found the manufacturer had used SILICONE around the fuel gauge seal and it had degraded and was in pieces in the tank. It would get sucked up over the opening and cause me to stall. Then after some sloshing around with us working on the bike as well as losing the suction from the pump, it would work free. Dug out the silicone and haven't had a bit of trouble out of her since. Have 9,000 miles on her in 2 riding seasons, replacing rollers with sliders and installing new belt in the coming weeks, ordered from over seas so you know how that goes. Good luck and happy riding!

Thanks LC.

When I replaced the fuel some clear fuel line that at local Cycle shop charged me an arm and leg for. And pretty much got soaked in gas changing out line. When I stopped to check and adjust the AF mixture thinking that might be the issue there was fuel up to the carb in the line.

So far I have not been able to test the last few items that I have found that could very well cause the surge issue because of our great Wisconsin Spring weather we are having. I will post an update when I am able to get back on the road and give it a good work out.

Thanks everyone for all your input. All these suggestions have really helped me find little issues that needed to be addressed.

[ladycat34]

Mine would do the same thing, that's what made it so hard to find. It just finally got "hung" enough in the drain hole to stay there for my husband to find that last time. Even though he had pulled the fuel line off and was getting fuel, low pressure at times, but it would flow with the pump. That lead to the pump change to electric. Also installed another vacuum port and routed vacuum a little different. I know it's time consuming, but costs nothing to pull the tank and remove the fuel gauge to check for silicone around the seal. Use a flashlight to check for "floaters" as the silicone kind of hangs suspended close to the bottom of the tank. Mine was a long "worm" with a skinny tail and the tail was what got in the fuel line. Just saying, why look for Zebra's just because you hear hoof beats? Check the free fixes first, then go to replacing parts.