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  Straightline's 727 Big Bore
As seen on the front of the website, Straightline's personal shop ATV. This is the monster, new sleeve, piston, gaskets, Camshaft, and head modification. Turn you ATV into a mud slinging monster. Recommend new exauast and intake changes to help the engine breath.
Price: $850.00 (unassembled)
Yamaha ATV Clutch Kits
Straightline clutch kits come from good old testing. We have kits for trail, mud, better belt life & acceleration, and to help restore lost rpm due to larger tires. We manufacture all of our own componets to top quality standards to ensure long lasting performance.

Kits available for: 660 Grizzly
Zuma Stock Upgrade Kit
Zuma Pipe Upgrade Kit

  Custom 660 Kit
Comes with 660 high comp piston, new camshaft, jetting, gasket kit, and clutch kit.
Price:
Intake cam
Improves mid to upper power. Intake cam can be used on the exhaust for added perfromance. For woods riding applications we recommend intake cam change only and both intake and exhaust for MX or desert riding. Includes adjustable cam timing sprockets. Cams sold separately. Uses stock valve springs.
Price: $159.95
Available for: Warrior, Big Bear, Kodiak, Wolverine
ATV Starter Springs
One of the best add-ons for your roller CVT clutch. This will help engagement rpm, increase low end lag, and increase acceleration. Available for 500 Vinson and 660's.
Price:$80.00 per set
Yamaha Secondary Spring
Load Heaghts 3-1.75
160-180 Purple/White
160-260 Purple/Silver
190-310 Purple/Orange
660 Grizzly CDI Box
High compression Piston
Help the entire range by boosting the compression. Piston comes complete with new rings and piston pin.
Available for:
Grizzly 600 10 to 1 $152.21
Grizzly 660 11to 1 $138.06
Raptor 660 11 to 1 $138.06
ATV Clutch Rollers
Yamaha primary clutch roller are precision made to ensure top quality and matched gram performance. Available in 12/14/16/18grams
Price: $50.00 set
Raptor/Grizzly Stage 1
Excellent bottom end through mid range, with top end power increase. Uses stock valve springs
Price: $149.95

Raptor Stage 2 (Not for Grizzly)
More top end, yet maintains most mid range.
Price- $149.95
Requires spring kit- $160.99
Banshee & Blaster
We are a two stoke specialist. So if you're looking for that mod Banshee or Blaster, look no futher. We do everything from porting to big bores. Call for all of your needs.
Yamaha Grizzly 4X4 (oversize tires)
Installation of larger tires results in taller gearing and loss of power due to turning this rotating mass. This kit helps to restore the performance of your machine. The kit comes complete with primary spring and new primary roller.
Price: $125.00
Warrior Stage one
Excellent bottom end through mid range, with top end power increase. Uses stock valve springs
Price: $149.95
YZF 450
Stage One: Excellent bottom end through mid range, with top end power increase. Uses stock valve springs
Price: $149.95

Stage Two: More top end, yet maintains most mid range.
Price: $149.95
Requires spring kit: $160.99
Yamaha ATV POWER UP KIT
10-15% Horsepower Increase for you ATV. Improved Throttle response. Comes with a jet kit, K&N filtercharger air filter, outerwears water repellant prefilter, K&N service kit, and complete instructions.
Starting at: $141.95
(all components can be purchesed seperately)
Grizzly Hop Up Kit
This is the complete kit to make your Grizzly the leader of the pack! Kit comes with high compression piston, camshaft, exhaust, gaskets, jetting, K&N Filter and pre-filter, Filter cleaner & pre-oil, and clutching. We also supply installation instructions and set-up procedures.
Kit special is -$999.95