Kirby Powersports and Service

Kirby Powersports and Service Specializing in sport quads and dirtbikes rebuilds

New stickers arrived today!
11/28/2025

New stickers arrived today!

Carb model YFZ450 is a MONSTER! probably one of the fastest quads I’ve ever ridden. So this quad got the following treat...
11/24/2025

Carb model YFZ450 is a MONSTER! probably one of the fastest quads I’ve ever ridden. So this quad got the following treatment.

-fully rebuilt FCR carb with R&D powerbowl 2 and flex jet a/f adjuster and jetted
-valve clearances adjusted
-new DASA exhaust
-oversized radiator
-tether installed
-new iridium plug

Yamaha Timberwolf 250 top end rebuild. All new OEM parts/gasket. Fresh cylinder bore job. Fresh valves, seats cut! Valve...
11/18/2025

Yamaha Timberwolf 250 top end rebuild. All new OEM parts/gasket. Fresh cylinder bore job. Fresh valves, seats cut!

Valve seals were shot allowing a ton of oil into the combustion chamber and caused massive build up in the head. Cam chain guides were toast as well.

11/06/2025

Runs good!

Yamaha RT 180 back to life! Fresh bore, wiseco piston, reeds fixed.
11/06/2025

Yamaha RT 180 back to life! Fresh bore, wiseco piston, reeds fixed.

Ready for iron man! Had to replace cam chain guides and port match the intake to the head.
10/21/2025

Ready for iron man! Had to replace cam chain guides and port match the intake to the head.

New winch and CVT Belt installed on customers 2006 Polaris sportsman 700 twin EFI.
09/24/2025

New winch and CVT Belt installed on customers 2006 Polaris sportsman 700 twin EFI.

09/11/2025
1 day turnaround. Motor rebuilt and back in the quad running. Along with some water protection.
09/11/2025

1 day turnaround. Motor rebuilt and back in the quad running. Along with some water protection.

A little porting fun!
08/20/2025

A little porting fun!

More mini quad work! Getting the machines dialed and ready for Dutch and Briarcliff.  Impact solutions is going through ...
07/20/2025

More mini quad work! Getting the machines dialed and ready for Dutch and Briarcliff. Impact solutions is going through the rear shock. We have a new rear brake line and caliper. Fresh ported 70 2fast motor! New precision stabilizer on the 90
Eric Kirby

Address

Durand, MI
48429

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