All 2st At a lectron or apt smart carb asap! :)

Was just pointing out many people had serious flooding issues with sticky tip over valves in the APT. Thats all. If they fixed that then great, none issue now.

Every Lectron I've put on a bike sucked dirt up the vent hoses until I ran them up under the tank or into the air box. In a GNCC race, a very muddy race, my son's bike would literally quit running, start after a bit, run for a while then quit again. When he finally got it back to the trailer, we found the vent hoses had mud plugs about 3/4 of the way up them. I would see dirt in the bottom of the fuel bowl... Did the hose relocation and then added a filter to them for comfort. Problem solved. On the APT, the tipover valves are a non issue my cast carb. I had problems with my first billet, #0005, and that was corrected with their spring loaded check valve fix. We had a 27mm APT on a KX85 that was literally perfect from the first installation. The Lectron is a great carb, too. Walt fairly well describes my feelings on the subject. One other note, when I put the APT on my WR250, I had issues with the bike that I pointed towards the carb. When I put the thermostat system back on it, problem solved. I also had Kevin at Lectron machine a 30mm carb for a KX112 Supermini bike, awesome performance from day one with it, too. Put the billet APT on a friend's old Honda CR480, nothing but praise. He put it on and made no adjustments.

I bought a used Lectron. Seller said he couldn't get it to work on his bike. When I pulled the slide, the needle was 180 degrees off. Meaning reversed... I put the carb on my WR360, fired up, ran great with a little tuning. I've read countless threads on the APT issues, makes me wonder what the hell is the problem. There is a set procedure to setting them up but some folks just don't get it in my opinion. Just my opinion...

Kelley, do you have to crack your throttle to hot start your bike? I don't.

Most bike yes, crack the throttle. Some no. Have never seen the vent hoses suck dirt up them on a 2 stroke, thats weird, there should not be suction there. I have seen hoses get mud in the end from being long and getting in the mud.

The mud plugging was with the as supplied kinda short vent lines. It was one of those to the airbox rut affairs! Looked like wasps had made it up the hoses! My son was pi$$ed. I expect the dirt issue is from sudden and then extended high rpm and maybe a tad small needle supply valve causing a high vacuum situation. It's possible the vents could be a tad small and the low fuel in the bowl would create the high velocity vent requirement situation. It has happened in every Lectron I've had. That's not a knock on the carb, just one of those things. I'm actually ready to pull the trigger on a downdraft Lectron for my TM 450.

Yeah. mud plugging the ends is bad. Most rout them tot he air box. I cut the overflow tubes lengthwise and also the ends at an angle. This usually keeps them free of obstructions.

Very odd. I would like to know more about this because I have sold over 400 Lectrons and have not had much report like this. Would love to come up with a permanent solution to this issue. We like to resolve issues and make these the best carbs. There should never be high vacuum in the carb bowl. Fuel is sucked out via the rod and PJ and replaced via the float and needle. I don't see why there would be high vacuum in the bowl wever. Not saying ti is not happening just trying to get my head around it. Thanks for the feedback.

My thoughts are that the demand, especially on the 165 at race pace, is greater than the flow through the float valve, combined with maybe a 'tad small' venting capacity. The fuel is being drawn up the needle by engine demand, inadequate supply and basically an 'aerated' (and lean) fuel flow at high velocity causing the dirt/dust/muddy particulate; to be introduced through the vent lines. I have no other idea why dirt would be on the bottom of my float bowl after a race. I run fuel filters and VP110 race gas. These were hi-comp 165s. Never felt that I had a fueling problem though. I wondered why the power jet wouldn't have passed the lower level fuel as well. Probably just in my head.