Yukon Trail Dirt Hawk 20 Owners Manual - Manual (Page 28)

DO NOT RETURN STORE. For questions regarding assembly and use, call Customer Service: 877-441-6999.
Adjustment and Replacement
On derailleur geared bicycles the rear derailleur automatically tensions the
chain. To adjust the chain on single speed freewheel, coaster hub braked or 3
speed hub geared bicycles:
1.
Loosen the rear axle nuts ( and coaster brake arm clip ) and move the
wheel forward to loosen , or backward to tighten, in the frame.
2. When correctly adjusted, the chain should have approximately
10mm(3/8’’) of vertical movement when checked in the center between
the chain wheel and rear sprocket. Center the wheel in the frame and
re-tighten the axle nuts after any adjustment. Bicycles which have a
single speed freewheel, coaster brake or 3- speed hub, generally use a
wider type chain than derailleur geared bicycles. These chains can be
disconnected by way of a special U-shaped joining link, that can be pried
off of the master link with a screwdriver. To replace, feed the chain
around the chain wheel and rear sprocket, fit the master link into the
rollers into each end of the chain, position the master link side plate,
and slip on the U-shaped snap-on plate. Make sure the open end of the
U-shaped plate is trailing as the link approaches the chain wheel when
pedaling forward.
Derailleur geared bicycle use narrower chains and require a special tool to
fit and remove chain links, or to change the length. To remove, fit the rivet
tool so that punch pin is centered over any one of the chain rivets. Push the
rivet almost all the way out, then back out the punch and remove the tool.
Holding the chain on both sides of the punched rivet, bend it slightly to
release link form the rivet. To install, feed chain around chain wheel, rear
sprocket and derailleur cage with rivet facing away from the bicycle. Bring
the two ends together within the special tool and punch the rivet into place.
Be sure not to push rivet too for through side plate.