May 3, 201511 yr My mate has had his EVO for about a year now and at first it would just randomly stall all the time which we though was due to a blob of aluminium rattling around in the fuel tank left over from where the previous owner had filled a tapped hole with weld! We thought it was cured but its still stalling all the time but pretty much only when the rear wheel is lifted off the ground. So far he's done all the usual things like: New spark plug Factory settings on carb Cleaned carb Checked reeds New fuel filter Reset float level Throttle cable adjuesments Idle adjustments New air filter But we still have this REALLY annoying problem! I seem to remember having the same issue years ago on one of my old Beta Rev3's and I'm sure it was an easy fix but for the life of me can't remember what I did? HELP! :-)
May 3, 201511 yr Author Just to clarify it's not just low idling when at an angle it actually stalls also.
May 3, 201511 yr Author what does it restart like ,,could it be flooding It restarts just fine every time first kick.
May 3, 201511 yr Check your wiring on the bike. I had a very similar problem on a rev3 I had. Every time I popped a wheelie on the bike it would cut out on me. It was so strange and I couldn't work it out. It turned out that it was a frayed wire up near the headstock that was shorting on the frame, causing it to stall immediately. As you probably know Betas are renowned for poor electrics as well so its worth checking. Hope this helps.
May 4, 201511 yr I had a similar issue on downhills so I pulled it all apart and found that the floats in the carb where tweaked (one higher than the other). After getting them to the same height and making sure they aligned parallel with the bottom casting of the carb (as the newer Beta manuals show) it *seemed* to fix the issue, I do still get a little bit of lowering of idle down the steep stuff. Another issue I've been told to check next time is the overflow tube which can get bent and cause the floats to hang up on it. I noticed that the way the float bowl goes together really lends itself to bending that overflow tube which could easily cause the floats to jam at the top of their stroke. Maybe giving the bike a good kick is what is releasing the floats?
May 4, 201511 yr Because of the angle Beta mounts the carb, downhills tend to stall bikes with badly adjusted floats but I think this sounds like more of an electrical oddity since you've had the carb apart already. Beta kill switches are known to be marginal at best so you could try there first. Edited May 4, 201511 yr by dan williams
May 4, 201511 yr Author Pretty sure it's not electrical as again today the idle revs were all over the place, it needed constant adjustment, one minute its low so gets adjusted back up then 10mins later it's high again so needs lowering again. Float level was adjusted yesterday but this time it was set to close the needle earlier to get more pressure on the needle to make sure it was closing and sealing properly. It seemed to stall a lot less today BUT as above the idle was just all over the place all day.
May 5, 201511 yr Sounds like an air leak. Time to break out the hot start for a little spray testing.
May 5, 201511 yr Author Sounds like an air leak. Time to break out the hot start for a little spray testing. How does that work? Not done that before?
May 5, 201511 yr spray flammable compressed liqiud around like easy start or hair spray to areas around engine and see if the revs pick up ,,, dont let it get to air filter side ,, remove flywheel cover and check crank seal area with spray
May 5, 201511 yr Author spray flammable compressed liqiud around like easy start or hair spray to areas around engine and see if the revs pick up ,,, dont let it get to air filter side ,, remove flywheel cover and check crank seal area with spray Oh yes of course that makes perfect sense. If it was an air leak though wouldn't it be more consistently hanging revs and high idling? As it seems very random at the minute.
May 5, 201511 yr air leak = stalling? So in neutral you lift the back wheel up and it stops? Immediately?
May 5, 201511 yr Author air leak = stalling? So in neutral you lift the back wheel up and it stops? Immediately? No, when the rear wheel is lifted the bike more often than not drops idle and stalls. If we up the idle to compensate for this then when the bike is level its idling too high. And also the bike seems to need constant idle adjustment throughout the day just to keep it running.
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