Tips

4105 Machining Instructions

Yamaha Blaster +4mm Stroker Crank Instruction Sheet

This crankshaft will not fit into the stock Blaster without machining the crankcase and combustion chamber. The crankcase bore must be increased so that the clearance
between the rod and crankcase is at least 0.020". Not all crankcases are the same due to casting differences. Cases should be inspected before machining to insure they will accept boring requirements.

Cases need only be bored from the center gasket surface outward, on either side, half the width of the rod plus the washer. The squish clearance should be no less than 0.50" with a final cranking compression of 165-180 PSI.

If you do not understand the above instructions, you are not qualified to install this crankshaft! Find a qualified mechanic. For further questions, please contact Hot Rods customer service at 515-402-8100 or online at hotrodproducts.com.

Download a PDF with diagram and information here.

More Tips:

thumbnail

Hot Rods Key Installation

View diagram for correctly installed key

View Tip »

thumbnail

4105 Machining Instructions

Yamaha Blaster +4mm Stroker Crank Instruction Sheet

View Tip »

thumbnail

CR124 Thrust Washer Note

Thrust washer instructions for CR 124

View Tip »

thumbnail

4182 Special Instructions

For KX450F Stroker Crank

View Tip »

thumbnail

HR-034 K046 Seal Notice

Please read before installation of this kit.

View Tip »

thumbnail

4183 Piston Note

For 4183 Stroker Crank

View Tip »

thumbnail

4091 Oil Pump priming instructions

4091 Oil Pump priming instructions

View Tip »

thumbnail

YZ 250 (1999-2016) Service Bulletin

Cylinder installation on YZ 250 (1999-2016)

View Tip »

9 Items - displaying 1-2
Fieldset title

Search By Vehicle

Catalog
Sign up for our newsletter