Frequently Asked Questions


Why Choose Lectron?

Lectron Fuel Systems has been pushing the limits of performance fuel systems since 1974 with the introduction of the first metering rod carburetor. We have a long and varied history in motorsport, supplying fuel systems for Drag Racing, Motocross, Enduro, Snowmobiles, Karting, Road Race, and many more. We bring a vast knowledge of how to make things go fast and combine it with a commitment to constant improvement. Our products are tested extensively on both the dyno and in the real world, by riders of all disciplines and skill levels, to ensure performance, durability, and reliability. All of our products are manufactured and assembled in the USA, and we pride ourselves on passionately providing expert technical support to back up our products.


How Does a Lectron Carb work?

Lectron Carbs work off the principle of a metering rod. A metering rod is a fuel metering device that uses engine signal (pulse pressure) to create a low-pressure zone that draws the correct amount of fuel across a wide range of conditions. Since this signal pressure varies with atmospheric conditions in close proportion to fuel demand, the metering rod can maintain optimal performance over large temperature and elevation changes; something that conventional carbs, which operate solely off venturi pressure, simply can't match. Additionally, metering rods offer a smooth slope that has no transitions. There is no need for dedicated circuits with discrete adjustment ranges. This prevents the flat spots in traditional jetting where conventional carb circuits overlap. We've also given our carburetors what we call "adjustable power jets" which give back some venturi based fuel delivery to add flexibility to the fuel delivery curve and more closely match the fueling demands at all throttle positions and RPM. Our adjustable power jets provide each rider value by providing the ability to adjust fuel delivery without the process of changing out jets, but also giving fine resolution, so you'll never be caught between jet sizes or have to open up the carb to change a main jet at the track.  They also are additive to the metering rod, so there are no gaps in overlap as mentioned previously with conventional carbs. Add this all on top of our proprietary bore design which both flows more air AND with more velocity, you get a stronger running motor that stays running strong wherever you go.


What is the difference between the Pro Series, Billetron, and H-series?

The PRO-SERIES is the latest iteration of our metering rod technology, featuring billet construction and both a Torque Jet and Power Jet. These externally adjustable "jets" offer independently adjustable fuel delivery from just off idle through half throttle and from half throttle through full throttle, respectively. They now also feature the addition of internal encapsulation that make the jets immediately responsive, making this carb the only carb on the market that beats the Keihin PWK in every category of performance. The infinite amount of adjustment, paired with the immediate power and torque of this Carb make it well suited for MX riders and woods riders that want peak performance and response. This carb is available as both a short body and long body variant to give OEM fitment. Read more about the advantages of our PRO-SERIES

 

The Billetron is the second newest iteration of our metering rod technology and is our first billet carburetor. This carb features an externally routed Power Jet with no Torque Jet, with the metering rod providing all fueling up to half throttle. This carb falls in between the H series and the PRO-SERIES in terms of performance and response, offering comparable performance to a Keihin PWK except with a huge gain in fuel economy and consistency across different conditions. This carb is best suited for those who like a smooth but responsive power delivery and to have a carb with great fuel economy that you can set and forget. This carb is also available as both a short body and long body variant to give OEM fitment.

 

The H-series is our last generation of cast carb. It also features our metering rod technology along with an externally routed Power Jet. This carb will also give a huge gain in fuel economy and consistency across different conditions and is the most set and forget option. Performance wise it matches OEM peak power with a very smooth and linear midrange, making it ideal for Enduro. Only long body variants are available and some bikes require air boot modifications to ensure fitment.


More Frequently Asked Questions:

Will the carb run perfect out of the box?

Every bike is a little different. While we do our absolute best to give settings that run perfectly out of the box, it is impossible to have every carb match every bike perfectly. Many bikes will require little to no adjustment with the settings we send the carbs with, however it is essential that you adjust the carb for your bike if it is necessary. Always ride with our base settings before making adjustments, as it should be very close out of the box and often don't need adjustment. If the bike runs very rich or very lean after the initial install, don't continue without double checking your install and the state of your engine. These carbs operate off engine pressure and are more sensitive to poor reed seal and air leaks. Please read the tuning guide section of our website for tuning and troubleshooting tips and feel free to contact us for more trouble shooting advice.

How do I start my bike with a Lectron?

The easiest way to start your bike is as follows:

1. Turn on the fuel
2. Turn on the choke
3. Slowly kick the bike over 3 to 5 times to prime the choke and find TDC (no throttle)
4. Give one hard kick to start the bike (no throttle). The bike should start on this kick. Once running you will need to turn off the choke immediately as the choke is very rich. You may need to give the bike some throttle once its started to keep it running while turning the choke off.
5. If the bike doesn’t start after 3 hard kicks, turn the choke off for your remaining kicks until it starts to avoid flooding it. If it regularly needs more than 5 kicks to start, your bike may not be tuned optimally, or there is an underlying mechanical issue.
6. If the bike absolutely will not start, try blocking off all but one of your vent lines with your thumb and blow into the remaining vent for about 2 seconds to prime the engine. This will get your bike running so you can identify what underlying issue you may have. This is not a long term solution.

Hard starting troubleshooting advice:

1. Make sure your idle gap (idle screw) is correct. Our two stroke carbs want a 2mm idle gap and our 4 stroke carbs want an idle gap of 1.5mm. You can count the number of turns to get the correct idle gap for reference in the future.
2. Idle fuel delivery on our 2 stroke carbs comes from the rod only. Usually a hard to start condition means your rod setting is too lean and needs to be richened (turning it right/clockwise is richer, please see our tuning guide for more advice).
3. Idle fuel delivery on our 4 stroke carbs comes from the fuel bleed only. Generally our Gen 2 carbs will have the fuel bleed around 1-1/8 turn from lightly seated and our Harley carbs will be around 1-3/4. Clockwise is leaner, counterclockwise is richer. If you find yourself at less than ¾ of a turn, your rod setting is likely way too rich and the bike is starting to run off the rod at idle.
4. Make sure the fuel level in your carb is appropriate. Too high will give too much fuel, too low will give too little fuel.
5. Make sure the flat side of your rod is facing the engine.
6. Make sure your bike is in proper working order. Air leaks, low compression, and reeds that don’t seal will all make the bike difficult to start.

How should I tune my new Xcelerator Rod?

Tuning:

The Xcelerator rod will tune similarly to the rod you already have. If you adjusted your old rod from the way we sent it to you we recommend starting with this rod at the same number of turns from its starting position as you went with your old rod. We advise against using the exact same starting length since different batches of rods have slightly different starting lengths. If you forgot how many turns you are on your old rod and want to use a length measurement, you can use this formula:

Old rod current length – old rod starting length + X rod starting length = X rod equivalent length

• Old rod current length: measured value of your old rod
• Old rod starting length: Length that we sent you your old rod (was on the sticker when you got your carb, you can us call with your carb serial number if you lost this number)
• X rod starting length: the length that we sent the Xcelerator rod to you at, will be on the sticker it comes with
• X rod equivalent length: Where you should start based on where you were with your old rod

*Please note that Xcelerator rods may work best 1/4 turns leaner than their equivalent normal rod, however we recommend starting at the same equivalent length (calculated above or by number of turns). *

The same tuning principles apply as a normal metering rod:
• Make sure you have the correct idle gap for your carb and reset it when making rod adjustments. If you were happy with your carb before, you shouldn’t have to adjust the idle screw much with these rods
• If your idle is too high, the rod is too lean and needs to be richened (clockwise)
• If your idle is too low, the rod is too rich and needs to be leaned out (counterclockwise)

What fuel should I use?

Please understand, we make high performance products. We do not recommend anything lower than 93 octane for stock motors. If you have additional modifications, many factors will play into the proper fuel for your vehicle and application. We highly recommend contacting our technicians or spending adequate time understanding and selecting the right fuel for the health and performance of your engine. Each fuel hosts different properties and characteristics within it; if you alter between fuels or change to new fuel, understand the tuning and requirements of your engine will change with it.

What oil should I use?

Most well known brands make a good product. We recommend picking a brand, using the oil they recommend for your riding type (trails, mx, desert, etc), and running it at the ratio they recommend. Each oil is different and is engineered to be used at a certain ratio. If the factory recommended ratio for a given oil isn't working for you double check that you are using the right oil for your application. We recommend Motul 800 for MX and Motul 710 for trails/enduro.

How do I route my vent lines?

Run your vent lines directly down by your swing arm. If you frequently go through deep water crossings, route one to your frame or air box.

What is TPS? Do I need it?

TPS stands for throttle position sensor. If your OEM carb has a plug with three or more wires coming out of it, your bike has TPS. IF there are no wires coming out of your carb, or a plug with only two wires (for a fuel cutoff solenoid) you do not have TPS. The purpose of TPS on most bikes is to allow for 3d ignition mapping which varies timing off both RPM and throttle position. This allows for slighly more throttle response at small throttle positions. The addition (or removal) of TPS on OEM carbs is much more noticable than with Lectrons, due to the bore design of our carbs creating more velocity at those throttle positions. For those who are interested in maintaining OEM TPS or adding it for an aftermarket ignition, our Pro Series is now available with optional TPS. The only bikes that requires TPS are Beta models with oil injection. To keep the oil injection system, you need a TPS sensor, otherwise you have to convert the bike for premix. Premixed Beta models TPS is there solely to be oil injection ready, they do not have 3d mapping.

I turned my idle screw a bunch both ways, why wont my bike idle?

This is one of the most common tuning errors we see. Our carb functions differently than an OEM carb and requires a certain amount of idle gap to function properly. Our two stroke carbs need a gap of 5/64" (2mm) which is about 4.25 turns form all the way in on the idle screw on Billetron 38/38 PRO models, and 5 turns on Big Air/Big Air Pro models. Our 4 stroke carbs generally need an idle gap around 1/16", the number of turns varies by model. For two stroke carbs, if your idle is too high or too low, the bike will not stay running, or is hard to start, you need to adjust your metering rod richer or leaner until the bike idles well at the correct idle gap. If the idle is too high, your rod setting is too lean and needs to be richened (clockwise). If the idle is too low, your rod setting is too rich and needs to be leaned out (counterclockwise). The idle screw should only be used for fine tuning the idle up or down after the metering rod setting is finalized.

My throttle cable end is smaller than the hole in the slide, do I have the wrong cable?

Our slides are designed to fit a variety of cable end sizes. If your cable end is smaller than the hole size that is perfectly acceptable.

If I see smoke and spooge, do I need to lean it out?

Certain brand oils and mixture rates smoke and spooge more than others. Tune it for the best performance, not the least amount of smoke.

Why does my bike sound rich, but run great?

Metering rod carbs draw fuel differently and sound different from a jetted carb. Tune for the best performance, not the best sound. DO NOT tune your bike on a stand in neutral!! You will likely tune the bike too lean if you're used to tuning a conventional carb that way.

Why is there air in my fuel line?

All fuel lines will have some air in them. The difference is now you can see it in our transparent lines and you couldn’t in the black line.

I'm going to an aftermarket head, aftermarket pipe, reeds etc. What do I need to change?

Try riding it with your current settings first. All bikes and combinations of aftermarket parts are different and minor rod tuning may be required based on how that specific part interacts with the rest of your bike.

Can I take a carb off bike "A" and put it on bike "B"?

As long as a bike is in the same CC class (125/150 or 200/250/300) your starting point will be similar. Every bike is slightly different and may require additional tuning. You can reach out to our support team for more info. If you have a TPS equipped carb, we sell different TPS adapters for different models.

What is the starting length of the rod for my carb?

Rods are mechanically ground and zeroed before we calibrate them to match your build. This means each rod will have a different starting length and will vary based on the batch and what we think is a good tune for you based off of your specs. They are always measured from the tip of the rod to the brass ring on the slide insert in inches (to the thousandth). Do not collapse the spring when measuring. The starting length can be found based on the carb serial number if ordered from a supplier, or if ordered directly from Lectron, it will be on your invoice and stored electronically in our system.

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Since 1974, Lectron has been synonymous with championship-winning performance. Pioneering the first metering rod carburetor, we've led the way in innovation and carburetion excellence. Our legacy began in the world of drag racing, where championship victories became our hallmark.

Why Choose Us?

Empowering Performance: Our carburetors deliver unparalleled horsepower and torque gains, with an estimated minimum increase of 10% over competitors. The enhanced CFM and earlier activation elevate power delivery at lower RPM ranges, translating to unmatched throttle response and peak performance.
Simple Mastery: Lectron has consistently simplified carburetion without sacrificing performance. Evolving from single-circuit fuel delivery, our carburetors now feature adjustable power jets, enabling on-the-fly fuel delivery alterations for specific throttle ranges without compromising power across the spectrum.
Set It and Forget It: Installing a Lectron carburetor means bidding farewell to constant jet changes. Our factory-manufactured carburetors, rod selections, and settings are tailored to your desired tuning upon installation, reducing the need for manual adjustments.
Innovative Expertise: Lectron's ownership changes over the years have ushered in new avenues of innovation, such as the adjustable power jet, the high-velocity bore design (H-Series), and the game-changing BILLETRON™. These advancements have solidified Lectron's position on podiums worldwide.
Customer-Centric Approach: Lectron's commitment to customers extends beyond the product. Our comprehensive customer support system encompasses product selection, application guidance, installation assistance, initial tuning, ongoing bike support, and more. Your journey with Lectron is supported every step of the way.
Choose Lectron for a seamless blend of innovation, performance, and unwavering customer dedication. Experience the difference that champions trust.

 
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