Contra spring Naraku +2000 rpm – GY6 / Kymco / Honda 125–200cc

Description

Reinforced Naraku +2000 rpm contra spring is intended for the rear part of the CVT transmission on numerous scooters with GY6, Kymco, Honda and SYM engines. It is primarily suitable for sport-tuned engines, where due to increased power the original contra spring no longer provides optimal transmission operation.

The current version of the Naraku contra spring is made from an improved spring steel alloy and has a special stiffness rating according to the change in rpm, which allows for a more precise spring selection than the usual percentage-based rating.

Operation +2000 rpm

The +2000 rpm designation means that with unchanged roller weight the variator changes the transmission ratio approximately 2000 rpm later than with the original spring. The engine therefore remains in a higher rpm range for longer during acceleration.

The stronger contra spring increases the pressure of the rear pulleys on the drive belt, which helps reduce belt slippage and enables more efficient power transmission on sport-tuned engines.

Technical specifications

• Manufacturer: Naraku
• Type: contra / contrast spring
• Version: +2000 rpm
• Position: rear pulley / CVT transmission
• Material: improved spring steel alloy
• Later variator shifting
• Increased pressure on the drive belt
• Suitable for sport and tuning configurations
• For numerous GY6, Honda, Kymco and SYM 125–200cc engines

Suitable for

Honda

• Honda @ 125 4T – JF07
• Honda @ 150 4T – KF03
• Honda Dylan 125 – JF10
• Honda Dylan 150 – KF05
• Honda Pantheon 125i 4T – JF12
• Honda Pantheon 150i – KF06
• Honda Passion 125i – JF17
• Honda Passion 150i – KF09
• Honda PCX 125i 2010–2011 – JF28
• Honda PCX 125i 2012–2015 – JF47
• Honda PCX 125i 2015–2017 – JF57
• Honda PCX 125i 2018–2020 – JF64
• Honda PCX 125i Euro 5 2021– – JK05
• Honda PCX 150i 2012–2015 – KF12
• Honda PCX 150i 2015–2017 – KF19
• Honda SH 125 2000–2004 – JF09
• Honda SH 125i 2005–2008 – JF14
• Honda SH 125i 2009–2012 – JF23
• Honda SH 125i 2013–2017 – JF41
• Honda SH 150 2000–2004 – KF04
• Honda SH 150i 2005–2008 – KF08
• Honda SH 150i 2009–2012 – KF10
• Honda SH 150i 2013–2016 – KF13
• Honda S-Wing 125i – JF12
• Honda S-Wing 150i – KF06

Kymco

• Kymco Agility 125 – LC2U62000 / KN25SA
• Kymco Agility 125 City – LC2C20000 / KL25BA
• Kymco Agility 125 City+ – LC2C21000 / KL25DA
• Kymco Agility 125 MMC – LC2U62001 / KN25EA
• Kymco Agility 125 One – LC2U62001 / KN25TA
• Kymco DJ 125 S – LC2U62050 / KN25GA
• Kymco Downtown 125i – RFBV21000 / SK25AA
• Kymco Downtown 125i ABS – RFBV21010 / SK25AC
• Kymco Heroism 125 / 150 – RFBSSB25AA / RFBSA30AB
• Kymco K-XCT 125i – RFBD81000 / SK25BA
• Kymco Like 125 / LX – LC2D20000 / KN25AA
• Kymco Movie S 125i – RFBV10010 / SR25BA
• Kymco Movie XL 125 – RFBS50010 / RFBS50011
• Kymco People GT 125i – RFBV41000 / BF25AA
• Kymco People S 125 – RFBD10000 / BA25BA
• Kymco People S 200i – RFBD12000 / BB40AA
• Kymco Super 8 125 – LC2U80000 / KL25SA
• Kymco Super 8 125 – LC2U82000 / KL25CA
• Kymco Super 8 125 Big Tire – LC2U80100 / KL25SB

SYM

• SYM Allo 125 – AJ12W1-6
• SYM Citycom 125 – LG12W-6
• SYM Euro MX125 – HF12W2-6
• SYM Euro MX150 – HF15W-6
• SYM Fiddle II 125 2007–2009 – AW12W-6
• SYM Fiddle II 125 2010–2014 – AW12W-T
• SYM GTS 125 Joymax – LM12W-6 / LM12W3-6 / LM12W5-6
• SYM GTS 125i Joymax 2013–2015 – LN12W1-6F
• SYM HD 125 – LH12W-6 / LH12W5-6 / LH12WB-6
• SYM HD2 125 – LC12W1-6
• SYM Jet 4 125 – AD12W1-6
• SYM Jet V 125 – HM12VA-6
• SYM Joyride 125 – LA12W-6
• SYM Megalo 125 – AK12W-6
• SYM Symphony 125 – AY12W-T
• SYM Symphony 125 SR – AZ12W1
• SYM Symply I 125 – AV12W-6
• SYM Symply II 125 – AV12W5-6
• SYM Tonik 125 – FW11A1-6
• SYM VS 125 2006–2007 – HA12A6-4
• SYM VS 125 2007–2008 – HA12C6-4
• SYM VS 125 2009–2014 – HV12W
• SYM X-Pro 125 – AE12W4

It is also suitable for various GY6 125/150cc, Baotian, Keeway, Znen and other scooters that use the same contra spring dimensions.

When is it recommended?

A stronger contra spring is recommended primarily for:

• sport-tuned engines
• increased engine power
• drive belt slippage
• engines that lose rpm too quickly during acceleration
• sport variators
• setups that require later CVT transmission shifting

Important when tuning

The contra spring directly affects the operation of the variator, drive belt and rollers. After installing the +2000 rpm spring, it may therefore be necessary to readjust the roller weight so that the engine operates in the optimal rpm range.