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Motosprtman

Cautious uncorking

6 posts in this topic

I have read about the many advantages of uncorking a stock XR650L, that a "Beast" resides within...thus with my curiosity drawing nearer - I wrestling with the decision to uncork my new toy. Currently the only mods / improvements I have made are a Baja designs skid plate , acerbis fork and disc brake guard and a Uni air filter.

IF I uncork it - may only the smog block off kit and carb rejet kit be used with the stock pipe. I don't want it loud - with an aftermarket pipe. Can you use just the smog block off kit without rejetting? I know you have to grind off the tab that prevents you from adjusting the air / fuel mixture screw, what is the adjustment for it after you remove the tab. Thanks in advance for all answers / advice etc :)

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Yes you can run the stock muff. with larger jets. I used the dyna jet kit and it made a big diff. The only problem I had was that the kit came with out a larger pilot (slow) jet. Once I replaced the stock pilot with a 55 pilot,my sparkplug turned coffey brown and the poping from being to lean went away. As far as the smog kit goes I found no impovement. May be it runs cooler? Just do a search for Daves mods and you will save money and your motor will be better for it. I have just ordered the xrs only complete exaust system (header tail section) in stainles steal. I have been told its not to loud.

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The stock jetting is designed for the stock airflow, which is restricted by the air box snorkel and the stock exhaust. You will need to rejet for a new level of airflow when you change the configuration of the air box and/or the exhaust system. The three items, intake, jetting, and exhaust need to be tuned as a system. If you rejet without changing the restrictive air box and exhaust system, you could end up with problems. If you do a lot of searching of this forum and read what is available on 4strokes.com you will find out what configurations have worked for others. I am no expert, but I followed the 4strokes.com (Dave and Brian) procedure with anew BigGun "Quiet Series" exhaust system, and had great results. The BigGun Quiet Series is a little louder than stock, but not bad, and it meets US Forrest Service sound requirements.

Mac

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Get a White Bros E-Series S bend, and add the Quiet Core insert....it adds mad power over stock and you lose that big ugly bazooka that looks like a WMD off your BRP.

Most guys run a 58/158 jet, shim the needle, and drill the slides to 5/16, then turn the screw out 2.25-2.50 turns. So much better !

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check out Supertrapp IDS2 quiet core pipe (XR600 model fits the 650'L') , ... about same loudness as stock pipe, affordable, too ... remember, when you upgrade your exhaust pipe, you probably will need another (richer) jet change to compensate for the better-flowing pipe ... enjoy

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