ATV Tech Support

Tim’s Tech Tips

for ATVs

 

 

CATALOGS & MANUALS
Online Parts Catalogs
Order parts online. 		Determine Year and Model
How to determine year and model
Owners Manuals
Owners manuals for ATVs & Scooters. 		Wiring Diagrams
Wiring Diagrams
Derestriction Instructions
How to de-restrict your ATV 		Troubleshooting & Tips

Troubleshooting guides
TECH TIPS

Drive Chain Adjustment

Replace Spark Plug

Carb and Air/Fuel Adjustment

Break-in Period

CDI Adjustment for E-ton ATVs

 More

On a daily basis I am asked numerous questions about the proper procedures to operating and maintaining ATVs.  I have started this page in an attempt to assist with the most common questions.  Hopefully, this information will be useful to you.  Keep checking back – I plan to keep adding Tech Tips!  If you need more help please feel free to contact me through the Ask Tim page.

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.