YAMAHA YZ 250F - JAMparts

YAMAHA YZ 250F(2008)

RACING & EVOLUTION EXHAUST SYSTEM

Akrapovič d.d. 2008 all rights reserved

YAMAHA YZ 250F (2008)

Product code: (108553) S-Y2MR8-QT racing(108534) S-Y2MR8-QTA racing spark arrester(108530) S-Y2MET8-QC, (108529) S-Y2MET8-QT evolution (108532) S-Y2MET8-QCA, (108531) S-Y2MET8-QTA evolution spark arrester

DESCRIPTIONRACING & EVOLUTION EXHAUST SYSTEM

The Akrapovic Racing and Evolution exhaust systems with their hexagonal muf-flers are the top of the line product for this motorcycle, and are designed for riders who know how to get the most out of their equipment. The increases in power and torque can be clearly seen from the dyno measurements and clearly felt on the motocross track. The muffler includes a noise damper for the European market, and an approved spark arrester for the US market. Header pipe features additional chamber for better response and overrev.

PERFORMANCE

Measurements of the Akrapovic EVOLUTION system on the YAMAHA YZ 250F (with muffler insert):

Power & Torque: the Akrapovic Racing and Evolution systems provide the increased performance that top riders are looking for. Engine performance is increased throughout the entire rpm range. The power curve is steeper and smoother, and the increases are highest in the low end and top of rpm range. We measured max power output of 35.3 HP at 12.050 rpm and max. power increase of 2 HP at 12350 rpm. The torque also gets a major boost, which will make riding smother and lower your times on the track.

CONFIGURATION

The Akrapovic Racing and Evolution systems come with the unique Hexagonal offroad design muffler. They differ only in their selection of tubing material: the Racing uses stainless steel, and the Evolution uses titanium. The conical header tube is made of stainless steel (Racing) or titanium (Evolution). It is attached to the conical SS/titanium link pipe with a sleeve joint secured with a silicon-shielded spring. Header pipe features additional chamber for better response and overrev. The link pipe is welded to the muffler. The inlet cap and the inner perforation are made of the same material as the link pipe, i.e. stainless steel (Racing) or titanium (Evolution). The outlet cap is made of carbon-fiber for evolution and composite polymer for Racing system. The muffler outer sleeve is available in either titanium or carbon-fiber. The system is attached to the motorcycle with Akrapovic carbon-fiber clamps. It also includes an Akrapovic car-bon-fiber heat shield. The system includes a noise damper for the European market, and an approved spark arrester for the US market, which is indicated on the muffler with a laser engraving.

PERFORMANCE

stock AKRAPOVIC max. increased power

max. rear wheel power HP / rpm

(measured on Dynojet ATV) 33.9 / 11500 35.3 / 12050 2 / 12350

interference crossover tubes

- lambda sensor NO

header tube inner sleeves S.S. CNC machined header tube flanges ALU CNC machined

header tubes - collector connection

-collector / header tube -

link pipe connectionSLEEVE JOINT + SILICON

SHIELDED SPRING

link pipe - muffler connection

WELDEDmuffler

inlet cap /outlet capS.S. - Ti / composite polymer

-Ti

muffler metal interior S.S. / Ti muffler outer sleeve Ti / Ti or carb.fiber

muffler clamp CARBON-FIBER muffler bracket -

muffler insertEU YES heat shield CARBON-FIBER

US YES catalytic converter NO

CONFIGURA-TION

CONFIGURATION

header tubes collector link pipe

material TITANIUM / STAINLESS STEEL/

-TITANIUM /

STAINLESS STEEL/

tube shape CONICAL - CONICAL

Technical specifications of Akrapovic exhaust systems and related products subject to change without notice.

ADDITIONAL DATA

weight comparison (kg)

stockAKRAPOVIC difference

3.2racing evolution stock - racing stock - evolution

2.92 2.33 0.28 0.87

noisemeasurements

(dB / rpm)

stock AKRAPOVIC

94 / 5000 94 / 5000

possibility of periodicservice without removing

A.E.S.

oil oil filter

YES YES

legal for street use NO

http://www.akrapovic.net




RACING & EVOLUTION EXHAUST SYSTEM EXHAUST PHOTO





RACING & EVOLUTION EXHAUST SYSTEM BIKE PHOTO





RACING & EVOLUTION EXHAUST SYSTEM BIKE PHOTO






YAMAHA YZ 250F, Complete exhaust system/Racing line, model year: 2008 Product code: S-Y2MR8-QT

P-HF180 HANGING FITTING ASSEMBLY

P-HSY2M1 CARBON HEATSHIELD (OPTIONAL)

P-VST3PO STICKER

M-Q02010T MUFFLER

P-VST2AL LEFT SIDE STICKER

P-MCTQ1 CARBON FIBER CLAMP FOR TITANIUM OUTER SLEEVE MUFFLER

P-FY25 FLANGE

P-73 INNER SLEEVE

P-S2 SPRING

H-Y2MR7 HEADER TUBE

V-TUV077 NOISE REDUCTION INSERT

SHEMATIC






YAMAHA YZ 250F, Complete exhaust system/Racing line with Spark Arrester, model year: 2008 Product code: S-Y2MR8-QTA



P-VST3PO STICKER

M-Q02010TA MUFFLER



P-FY25 FLANGE

P-73 INNER SLEEVE

P-S2 SPRING

H-Y2MR7 HEADER TUBE

P-SA011 SPARK ARRESTER

SHEMATIC






YAMAHA YZ 250F, Complete exhaust system/Evolution line,

model year: 2008

Product code: S-Y2MET8-QC S-Y2MET8-QT


P-HSY2M1 CARBON HEATSHIELD

P-MCCQ1 CARBON FIBER CLAMP FOR CARBON OUTER SLEEVE MUFFLERP-MCTQ1 CARBON FIBER CLAMP FOR TITANIUM OUTER SLEEVE MUFFLER

M-Q02005T FULL TITANIUM MUFFLER M-Q02005C TITANIUM MUFFLER WITH CARBON FIBRE OUTER SLEEVE


P-FY25 FLANGE

P-73 INNER SLEEVE

P-S2 SPRING

H-Y2MET7 HEADER TUBE

V-TUV077/TI NOISE REDUCTION INSERT

P-VST3PO STICKER

SHEMATIC






YAMAHA YZ 250F, Complete exhaust system/Racing line with Spark Arrester, model year: 2008 Product code: S-Y2MR8-QTA



P-VST3PO STICKER

M-Q02010TA MUFFLER



P-FY25 FLANGE

P-73 INNER SLEEVE

P-S2 SPRING

H-Y2MR7 HEADER TUBE

P-SA011 SPARK ARRESTER

SHEMATIC






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DIAGRAM / CHART


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YAMAHA YZ 250F - JAMparts