XR650R airbox/left hand side cover modification by team Honda

It might take in more air but that doesn't mean it breathes better. Honda does not recommend the mod without the cam. So who's right?

Dez - I am doing it to a HRC kitted XR600 - with FCRMX carby- free flowing exhaust etc etc.

Burned suggest I open the bike up as much as possible - after all most bikes are just air pumps.

Hope 'bout this stuff... cheap too... 12in x 12in ~$3.50

www.mcmaster.com

p/n = 9230T525

although, you might want to do long slots, instead of a big square becasue the wire diameter is very thin.

I had a 600 with the HRC 628 kit. I opened the top of the box and drilled 1" holes for White Bros. foam vents in the side cover and it ran fine. I had a 168 main and a 68 pilot also had to run race fuel to keep the octane close to a 100. Did you do the high compression piston too?

I had a 600 with the HRC 628 kit. I opened the top of the box and drilled 1" holes for White Bros. foam vents in the side cover and it ran fine. I had a 168 main and a 68 pilot also had to run race fuel to keep the octane close to a 100. Did you do the high compression piston too?

hey dez

here are my mods ( some waiting on mechanic) most done:

• HRC 628cc engine (the factory honda kit with cam, hogh comp piston etc)

• Complete Staintune header and exhaust

• Setrab oil cooler/XRP lines

• CRF450R (2005) complete front end – forks, triples, hub

• CRF 450R brakes

• XR650R headlight shroud

• XR650R front guard

• Honda OEM 55 watt glass headlight system

• Keihin FCR-MX41mm carburetor with TPS,choke and hot start (with Hot start from CRF450R carb plumbed in) 170mj, 42 pj, emp needle, 4th from top per burned spec... not fitted yet...hope it fits!!!!

Works connection elite clutch perch

• Works connection right side decomp lever

• Works connection CRF450R throttle tube

• Works connection frame guards

• CRF450R throttle pull/cables.

Excel black rims F & R.

Braking oversize front disk

IMS 17 liter tank.

• IMS pro pegs

• Ceet hard seat foam

Renthal sprockets

• Renthal grips

• DID chain

• Pro taper bars

BRP submount

• Grip heaters

Eibach rear spring.

• 200 watt electrical system running dual circuits (AC for lights and DC for instruments and charging duties)

• XR650L regulator rectifier

• XR650L starter clutch, gears, starter motor and wiring.

Everything else is original XR600...

* Garmin gps 276C with tourtech mount system and enduro engineering mounts coming soon

Bike does need min 98 octane to run proper.

WOW, you have one heck of a ride going there. Did you notice the huge difference in 3rd and 4th gear pull after installing the 628 kit?

It might take in more air but that doesn't mean it breathes better. Honda does not recommend the mod without the cam. So who's right?

"Some people with just the power up kit installed have also reported good results with gains of a few horsepower above 4,500 RPM's."

hey dez

here are my mods ( some waiting on mechanic) most done:

HRC 628cc engine (the factory honda kit with cam, hogh comp piston etc)

• Complete Staintune header and exhaust

• Setrab oil cooler/XRP lines

• CRF450R (2005) complete front end – forks, triples, hub

• CRF 450R brakes

• XR650R headlight shroud

• XR650R front guard

• Honda OEM 55 watt glass headlight system

• Keihin FCR-MX41mm carburetor with TPS,choke and hot start (with Hot start from CRF450R carb plumbed in) 170mj, 42 pj, emp needle, 4th from top per burned spec... not fitted yet...hope it fits!!!!

Works connection elite clutch perch

• Works connection right side decomp lever

• Works connection CRF450R throttle tube

• Works connection frame guards

• CRF450R throttle pull/cables.

Excel black rims F & R.

Braking oversize front disk

IMS 17 liter tank.

• IMS pro pegs

• Ceet hard seat foam

Renthal sprockets

• Renthal grips

• DID chain

• Pro taper bars

BRP submount

• Grip heaters

Eibach rear spring.

• 200 watt electrical system running dual circuits (AC for lights and DC for instruments and charging duties)

• XR650L regulator rectifier

• XR650L starter clutch, gears, starter motor and wiring.

Everything else is original XR600...

* Garmin gps 276C with tourtech mount system and enduro engineering mounts coming soon

Bike does need min 98 octane to run proper.

Everything else ? :thumbsup:

As I stated earlier, Precision Concepts does not recomend the side panel mod with the stock cam.

Trail, I misunderstood at first thinking the bike was a 650R. The 600 has to have the airbox opened up to uncork it.

As I stated earlier, Precision Concepts does not recomend the side panel mod with the stock cam.

Have you tried it with the stock cam? With a after market free flowing filter?

Some riders out there are looking for the bike to pull harder in the mid to high rpm's and are not ready to spend the money to buy a header, pumper carb and other mod's to pull them through the big whoops at higher speeds and a little more air into the air box does help here. I do not think it's a wise mod if you do not use a water proof air filter oil like Golden spectro foam air filter oil and you ride through water.

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