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  2. Honda CRF series - Wikipedia

    en.wikipedia.org/wiki/Honda_CRF_series

    2010 Honda CRF250R at the 2009 Seattle International Motorcycle Show. The Honda CRF series is a line of four-stroke motocross, trail, and dual sport motorcycles manufactured and marketed by Honda. The CRF line was launched in 2000 as a successor to the Honda CR series.

  3. Four-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Four-stroke_power_valve_system

    Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). [1] It first appeared on the Yamaha FZR EXUP and was later used on many other Yamahas. Later versions from Honda went by the names Honda Titanium Exhaust Valve (HTEV) and Honda Variable Intake/Exhaust (H-VIX), [1] appearing on the CBR600RR and Honda ...

  4. Honda CRF450R - Wikipedia

    en.wikipedia.org/wiki/Honda_CRF450R

    The Honda CRF450R is a four-stroke racing motocross motorcycle built by Honda Motor Company. ... In 2003, camshaft, exhaust, and ignition map were revised.

  5. Honda CRF250L - Wikipedia

    en.wikipedia.org/wiki/Honda_CRF250L

    The Honda CRF250L (model designations MD38 and MD44) is a dual-sport motorcycle, part of their CRF series, manufactured for a global market. It was first released in 2012 for the 2013 model year. It was first released in 2012 for the 2013 model year.

  6. Federal Motor Vehicle Safety Standards - Wikipedia

    en.wikipedia.org/wiki/Federal_Motor_Vehicle...

    FMVSS are currently codified in Title 49 of the Code of Federal Regulations, Part 571, Subpart B (49 CFR 571), with each FMVSS standard as a section of Part 571, e.g., FMVSS Standard No. 101 is 49 CFR 571.101.

  7. Tuned exhaust - Wikipedia

    en.wikipedia.org/wiki/Tuned_exhaust

    The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head, and merge into two pipes (secondary), which in turn finally link up to form one collector pipe. [2] Compared with a 4-1 exhaust system, a 4-2-1 often produces more power at mid-range engine speeds (RPM), while a 4-1 exhaust produces more power at high RPM.

  8. Exhaust system - Wikipedia

    en.wikipedia.org/wiki/Exhaust_system

    The end of the final length of the exhaust pipe where it vents to open air, generally the only visible part of the exhaust system part on a vehicle, often ends with a straight or angled cut but may include a decorative tip. The tip is sometimes chromed. It frequently has a larger pipe than the rest of the exhaust system.

  9. Muffler - Wikipedia

    en.wikipedia.org/wiki/Muffler

    Silencer (silver) and exhaust pipe on a Ducati motorcycle A silencer cut open to show the insulation, chambers and piping inside the shell. A muffler (North American and Australian English) [1] or silencer (British English) is a device for reducing the noise emitted by the exhaust of an internal combustion engine—especially a noise-deadening device forming part of the exhaust system of an ...

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