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sand and top end
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Posted by: vfox44---------------------
I am having top end replaced after get some sand in motor. Think bottom is okay. Should bike be solid after work, or am I looking at the slow death of my xr. One other question, any tips on keeping sand out of air box. Used Uni filter and oil does not seem to be good choice for sand. Heard No Toil stuff is better. Is their anything else like filter skins some type of gasket to create better seal between side number plate and air box. Basicly, I know this bike is made for the desert but is it made for the sand.
Posted by: Moto Squid---------------------
I thought the desert is made out of sand 
I'd suggest using Maxima FFT (foam filter treatment) oil. This stuff is extremely tacky and doesn't let anything get past. It is more of a pain in the rear than just the normal no-toil or spray oils, but the benifits are worth it. And consider a Twin Air filter, as I've been extremely happy with mine.
You cannot keep the sand out of the airbox...it's the quality of the filter and oil that will keep the grit out of the motor.
Posted by: woodsy---------------------
Hey guys dont forget to grease the seal between the filter and the airbox (also around the bolt that holds the filter on if your bike has one). I even like a light smear of grease inside the airbox/carb connection tube - I have found small particles trapped in this at filter cleaning (hey every grain of sand not going into my motor is a PLUS!!!)
Being a 4 stroker that bottom end should be fine. The crank bearings on a 4 stroke are lubed thru crankcase oil not gas/oil premix! Of course it really doenst matter if you grenaded the top end - in this case all those little pieces have to go somewhere - and they usually end up in the BOTTOM end! If it was just a scored jug/damaged piston on that XR you should be fine with a top job!
Woodsy
Posted by: motometal---------------------
I also like the grease in the air boot treatment. How about white lithium so you can see the dirt? Greasing the filter element and the boot where it seals to the carb shouldn't be needed unless something is bent or warped.
Assuming you do your job on oiling the filter, the #1 cause of sand in the motor would be having it wash in with a water crossing or from washing the bike. You can use a ladies' hair net with elastic band around the filter while washing, if there is room to get it over the filter. Don't worry too much about dirt and sand in the air box...as long as it doesn't travel into the boot while the filter element is out for service, no problem. I think putting the special cover over the boot and hozing out the air box regularly is overkill and a bit whacko...just begging to wash dirt into a place where it shouldn't be.
Posted by: reynome---------------------
Personally I would get all over where the contamination is coming from! Examing the filter for "dry spots" which are obvious if you look at the inside of your filter after its use. If you see dirt coming thru the filter its not oiled correctly. I have first hand experience not oiling my filter enough. To combat this I use a designated amount of oil, 4oz (measured) of no toil in my case, and make sure the filter is supersaturated. I also use filter skins when on very dusty races or on a weekend long ride and I cant change the filter all the time. Any dirt past the filter is costing you alot of money and time IMO.
Posted by: motometal---------------------
do you oil the filter skins? same oil or different?
Posted by: reynome---------------------
Yes, I oil the skins just like the filter. They are a pain to put on but they seem to work well.
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