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All New dirt bikes come with drive chains that should be replaced very soon after break in
This is common motorcycling knowledge and true industry wide on most all brands
Change out the drive chain to a quality D.I.D Renthal or Magnum before you have damage from a thrown chain
Most Pit Bike Take 420 Chain
Honda XR/CRF50 XR/CRF70 CRF110
All of the 420 Chain we sell will be long enough to suite most all builds but must be custom cut to legnth by you
We offer chain breaker tool or you can use a bench grinder or hand grinder
All of the Chains we sell include a master link
Here is the best way to check your chain tension:
Tip: A quick and easy way to check the chain tension is to place your 3 middle fingers on top of each other (like a 3 fingered gun) between the chain and the back of the rubber chain guide on the front of the swingarm. You should only be able to fit those 3 fingers in. This is a good guide but will not be accurate if you have sausage fingers. Do this with your bike on a bike stand with the rear wheel off the ground.
Tightening your dirt bike chain:
The best way to lube your chain is to place your bike on a bike stand and spray it while spinning the rear wheel.
Final Drive Gearing info:
DIRT BIKE GEARING TECH
For Faster Acceleration (lower gearing)
Lower gearing with make each gear shorter and make you shift thru the gears faster
Use a small front sprocket (countershaft) or larger rear sprocket.
For every 1 tooth you change on the front, it is the equivalent to changing 3 teeth on the rear.
Creates a lower gearing ratio. This is ideal for tight trail riding or tracks without many long straight sections.
A lower gear ratio works well for Arenacross opposed to wide open desert racing.
For Faster Top Speed (higher gearing)
Higher gearing will allow each gear to be used longer
Use a larger front sprocket or smaller rear sprocket. Again, changing the front makes a larger impact to your gearing than changing the rear.
Creates a higher gearing ratio. Higher gearing ratios work well in high speed situations such as desert riding, sandy motocross type tracks or anywhere that does not have very many tight turns.
As a general rule, for every tooth change on the front sprocket you are changing the rear sprocket by approximately three teeth.
If you are looking for a subtle change in your gearing, add or reduce 1-2 teeth on the rear sprocket.
General rules for Pit bikes
If your running MX tracks you want be in 3rd gear most of the time
Drop into second on turns , hit 4th only on longest straights
Most Pit bikers change the front because its cheap to do
Pist bikes have a very low 1st gear
Most guys go to a 17T tooth front right away to allow 1st gear to be usable
Find out what ratio you bike came with stock then adjust
Sprocket Settings And Drive Ratios
Depending on whether you want to ride on tight bush trails, supercross tracks or wide open fast motocross tracks you may want to adjust your sprockets to alter the low-end power or top speed of your bike.
The easiest and cheapest way to adjust the final drive, or gearing of your bike is to change the front sprocket. However, it is recommended you change both to get a better result. As a general guide, changing 1 tooth size on the front is equivalent to changing around 4 teeth on the rear.
If you replace the front sprocket with a smaller one (less teeth) you will increase low end power but decrease the top-end speed - good for tight motocross or supercross tracks. If you replace the rear sprocket with a larger one (more teeth) this will do the same.
Chart for Final Drive Ratio