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Drive Chain Adjustment

Replace Spark Plug

Carb and Air/Fuel Adjustment

Break-in Period

CDI Adjustment for E-ton ATVs


Drive Chain Adjustment

The drive chain will stretch with use and will require periodic adjustments. To check the chain tension, remove the chain guard and measure the slack. The amount of slack in the chain should not exceed 10-20mm or ¼” - ½”.


Inspect the drive and axle sprockets for worn, damaged or broken teeth. Replace as needed. Inspect the chain links for damaged, worn or loose rivets. Repair or replace as needed.

Chain Slack Adjustment

Loosen the axle position lock bolts slightly and turn the chain adjuster nut to take up the excess slack in the chain. Once the chain has been adjusted to the proper tension retighten the axle position locking bolt.

The chain should be kept well lubricated to prevent excess wear and premature failure. We recommend that you lubricate the chain every 15 hours of operation, or more frequently if needed, with a high qualitychain lubricant.

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Replace Spark Plug


Two cycle engines burn a mixture of fuel and oil. When the mixture contains too much oil the spark plug can become fouled causing a weak spark condition that will drastically degrade the engine performance. When the plug is fouled heavily a no spark condition can occur the will prevent the engine from running at all.

You should replace your spark plug at the beginning of each riding season. To change the spark plug do the following.

  1. Stop the engine and wait for it to cool, 30-60 min. (Never work on a hot engine because the heat can cause sever burning.)

  2. Locate the spark plug at the front of the engine.

  3. Remove the Spark plug lead wire by gently pulling on the plug wires boot. Do not pull on the wire itself as this could cause damage to the wire.

  4. Remove the old spark plug using the supplied plug wrench and screwdriver by turning the plug counter clockwise.

  5. Set the electro gap on the new plug to 0.6m-0.7mm / 0.023”.

  6. Insert the new plug by hand and tighten finger tight by turning the plug in a clockwise direction. Use caution not to cross thread the plug in the head.

  7. Use the plug wrench to tighten the plug another ¼ to ½ turn. Caution:  over tightening the plug can cause the thread in the
    engine head to be striped, under tightening the plug can cause compression lose and possible cylinder head failure.

  8. Reinstall the plug wire by pressing the wire boot over the plug until it is completely seated on the spark plug.

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Air/Fuel Adjustment




Step 1: Air adjusting screw

Turn adjusting screw all the way in then back off
¾ to 1¼ turn on 50cc engine
1 to 1½ turns on 90cc engine.

Step 2: Adjust idle RPM. (Warm Engine)

Turn the adjustment screw in or out to adjust the engine idle speed to
Between 1700—1900 RPM.


Click photo to enlarge


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Break-in Period

Your ATV requires a break-In period just as with all other internal combustion engines.

This period allows the engine parts to seat and wear properly without undue strain which can cause premature failure.


Below is the recommended break-in period for the E-ton ATVs.

  1. For the first two weeks of operation do not run your ATV at full throttle for extended periods of time.

  2. Viper 50M/50/70/90/90R: Your first tank of fuel should be a pre-mixture of fuel and oil at a 50:1 ratio. This will insure that the oil pump system has been primed and bled of air that may have occurred in shipping.

  3. Viper Jr:  All fuel should be a pre-mixture of fuel and oil at a 50:1 ratio.

  4. Do not operate the unit at more than 85% of maximum speed.

  5. Do not over rev the engine.

  6. Use light braking pressure to allow the brake pads to seat to the rotor and drums.

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CDI Adjustment For E-ton Vipers

Eton has installed an adjustable speed control on the 2005 Viper models from the RXL-50M through the RXL-90R. This devise allow the vehicle speed to be increased in steps as the rider becomes more experienced.


The CDI is located under the seat.


Click photo to enlarge


The table below illustrates the factory setting, which is a combination of the setting on the CDI pod and the throttle stop bolt. It can also be used to set the desired speed limit for each model as the rider develops their skill level. Use a combination the CDI control pod and throttle stop bolt to set the desired for the customer.



Adjustable CDI


Adjustable Position

Viper 50M

Viper 70

Viper 90

Viper 90R


Factory Set Speed 10 mph 10 mph 15 mph 15 mph 35.6 mph
0 9.6 mph 13.2 mph 14.7 mph 14.3 mph NA
1 14.1 mph 18.6 mph 20.6 mph 19.5 mph NA
2 18.2 mph 21.2 mph 25 mph 24.6 mph NA
3 20 mph 23.4 mph 27.2 mph 27.2 mph NA
4 20.1 mph 26.5 mph 29.7 mph 27.8 mph NA



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E-ton Specific Tech Support

E-Ton ATV Optional Accessories
Accessories.  Headlight Kits, Remote Control, Chassis, Etc.
E-Ton Optional Remote Stop Switch Installation
Viper 70 & 90 Optional Remote Installation Instructions.
E-Ton 50/90 Air/Fuel Adjustment Procedure
Viper 50, 70 & 90 Air/Fuel Adjustment Procedure.
E-Ton Adjustable CDI Chart
E-ton Chart for Adjustable CDI.