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  • Writer's pictureBashir Jardaneh

Project - Build the Ultimate 4XV R1

As this is not a dedicated track bike, I wanted to keep the bike fairly stock, keeping modifications somewhat modest.

Here is the list add reasoning behind the choices.

Exhaust - this R1 uses an EXUP system, after reviewing dyno charts & evaluating the way the stock bike delivers its power, I think it would be best to use only a slip-on exhaust to utilise the EXUP valve and keep that low RPM torque.

I sourced a Harris Performance Titanium slip on, from a 4XV, direct from a mechanic who works for Harris.

Rear Sets - I didn't fancy after market rear-sets, as the shift rod would need to be relocated outside the frame. I have fitted Harris road pegs, and custom machines bosses to fit the new pegs to the OEM footrest brackets.

Brakes - Venhill brake lines all round, in black with black fittings, to look OEM.

Replaced the original Master cylinder with an OEM Nissan MC. Improved braking with OEM looks.

Suspension Shock - Has to be Ohlins! A period Ohlins shock with correct spring for my weight.

Suspension forks - These have been re-valved with K-Tech pistons & matching springs to provide race spec valving and control, while looking totally original.

Drive train - The original 530 chain & sprockets have been swapped out for DID ERV3 520 race chain & Renthal sprockets, down gearing the bike from a theoretical 295kph to 272kph for improved acceleration.

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