srfallsallot

Sorry I did not let you know what cc I was refering to. Beta EVO 290. So very smooth.

Do any of you know at waht serial number they changed the swing arm in 2009?

Hi We ride above 6000ft. The supper smooth bottom in tight sections is amazing. The ability to apply power smothly going up long loose climbs is a real advantage.

Thanks all for the advice. I have done everything that anyone has sugested. None of it worked. My new carb arrived. It is not a perfect match but close enough. I used the original top plate,slide, needle, jets, and the bowl from my old carb. I plugged an extra hole on the engine side of the carb. I did not mess with the float. I kicked it once and it fired right up. It runs smooth and has huge bottom end power and top end too. I am not able to ride this extensively at home so I do not know how it will perform in a real trials but I hope this weekends 2 day trials at Roswell New Mexico USA will turn out OK. Many thanks to all of you who took the time to think about and offer advice. Special tahnks to Bob Rowland, Adrian Lewis of Lewis Sport, and Tim Pilg of American BETA. These great people went way beyond anything I could ever have expected in there efforts to help me out of this maddening problem. I guess I will never know what the problem really was. Thanks All

Yes I have thought of that too. I did the push on it thing to see if it made any difference. It did not. I have checked the rod to see that it moves freely. Thanks

I have set the levles to theeven at 45 to more and less. It still runs fat with absolutely no bottom. A new carb is on its way.

My friend brought his carb from his 96 BETA. We put it on and it runs great. SOOOO it is a Carb problem. It has got to be a float problem. I am just stumped. Do I have to buy a new carb? Thanks so much to all of you who have read this saga and offered sugestions.

It is below The plastic keeper.

Thanks for thinking of me. First off the bike ran very well for several trials. So it is not a jet size problem. Yes i checked the jets to make sure they are clean. I have replaced the coil, black box, and the stator. Each on individually. The problem has not changed. I have put all the original parts back and it runs just the same as with the new parts. A friend is bringing over a carb from an 96 BETA that runns ver well just to try. I am also going to put all mey carb parts into the Carb body that American BETA sent. I wish I new what I was doing. Again thanks for your time.

Hi all. Thanks for all the advice. Update. Our importer American BETA Tim Pilg with consultation with a good friend and long time Trials rider, mechanic and dealer Adrian Lewis of Lewis Sport sent a box of parts to try. A new coil, Black box,stator and a carb used carb body. I replaced the coil with no change. I replaced the black box with no change. I replaced the tower in the my carb with the tower from the sent carb. The pilot jet sits in the sent carb tower 1/2 mm less deep than the the original. No change. I have not replaced the stator yet. I am loth to do that as I hve no experience with this and I fear making more problems. Again thanks for all the advice.

It does not "pee fuel" since I polished the seat for the float needle.The vent holes are to air. Thanks

I removed the carb again. I have removed the valve petals to check for damage. They are perfect. I dissembled the carb completely (I have security torx drivers.) I polished the seat of the float needle. I have cleaned out all passageways with carb cleaner, compressed air, and mono filament fishing line several times.. The float does float in a bowl of gas. The float is now set so that it closes much earlier than shown in the attachment. If it is set at the attachment specification it floods horribly with fuel running out the vent tubes. I can now get it started. After starting and warming up. It runs fat at higher revs. It will not run at all at low revs where the pilot jet should be on. If I turn off the petcock as the fuel is used up in the carb it begins to run like it should until the fuel runs out completely. It starts easily with a few kicks and a partially open throttle with the fuel on. This problem just does not seem to be an ignition problem. I do have a new kill switch and will put it in and disconnect all accessory electrical connections if you really think that is electronic. If it was electronic why when the fuel is turned off it begins to run correctly? I do not have access to another carb from a running bike to try as others have suggested. I have been working on it for the last 12 hrs. The needle and seat are shutting off. Slowly working up from an empty bowl so that there is more fuel in the bowl. This is most difficult as there are few good surfaces to measure from. At any rate fuel is now 17mm below the split line with the floats out. It still has no bottom end. If I had access to a machine shop I would fabricate a gauge that would screw into the bottom of the bowl with a tube so that I could measure fuel level in the bowl with the carb in the bike. At this point I am wondering about the electrical system too just because I am ignorant about the real technicalities of engine design and electrical system. As it is I have a very expensive piece of junk. I still love this BETA but this is the most trouble I have ever had.

I have done all that you all have suggested except the electrical ideas. I will do that next. The fuel is clean. I have cleaned out the exhaust system. The reeds have been checked. It is still flooding with a lot of fuel running out of the vent tubes. The needle does not seem to shut off properly. I have had my favorite professional mechanic work on it and he does not seem to be able to make it run correctly. I am at a loss as what to do next. Hope fully I can solve the flooding problem. I will check the electrical system. Maybe I have multiple problems? Thanks all.

Thanks I do not think that this is the case because it is a low time bike but I will check this out.