250-500cc Chain on non-brake pedal side is MUCH better in mud

Had my first true mud ride on the WR300 this past weekend. You can see by the picture just how much mud and debris was deposited near the rear brake pedal by the spinning chain. Three times throughout the ride I had to stop to clear out the crud that packed in so tightly around the pedal because it caused me to not be able to find the pedal with my boot. Obviously the rear brake is the most used in these conditions, so it pretty much sucked. Not sure how to prevent it next time...

That is a lot of mud build up. I haven't gotten that muddy on the WR yet.
Not sure if it will help in your case, but an old mud trick is to ArmorAll everything which keeps the mud from sticking. So fenders, tires, rims, swingarm, chain guide, etc. Worth a try, can't hurt and at least the mud will rinse off easier.

cheers

I lost my front sprocket circlip not too long ago during a muddy ride like that. Not sure if all the mud caused it...

using this same argument suggests that left hand chain driven cycles cause the gear selector to stop functioning due to mud being flinged from chain.

The fault lies with your brake pedal, get one with proper teeth on, never had an issue with my rfx tip an im in the uk and its muddy here all year round!

Not necessarily. The brake pedal and linkage to the master cylinder are a lot more exposed and are farther back then the shifter shaft and shift lever. And the brake pedal curves over the footpeg, the shifter does not. There is much more opportunity for interference from accumulated mud with the brake pedal than the shifter.

Well it looks like a frame/master cyl. guard is in order. I wonder if a front sprocket guard would contain or limit the mud

My 09 WR 300 has been muddy but never really had any problems finding the brake.

I hear you can put a four stroke rear brake pedal on these. They are less tucked in. CS sprocket covers IMO simply collect mud. Buy a case saver instead.

id say the back wheel is doing a lot of that . the chain isnt going to pick up and carry lumps that big

Im not really sure that your chain location is to blame here. If it wasn't your brake pedal it would be your gear shift lever. I know in really muddy conditions we used to use an oil based chain lube as opposed to a wax based one. The idea being that as the chain runs around & accumulates mud it will fling off along the way. This seems to work really quite well (although it creates a lot of oil spatter on your bike). But once the oil is gone this functions stops so you need to keep the oil up to the chain. I don't know, maybe you are already using an oil based lube. But if you aren't it might be worth a shot. Hope it helps