Quote:
Originally Posted by txgringo
So I got a used Hawk 250 with only 250 miles on it last October. I've put about 200 on it since then. Lots of mods and updates, new chain, sprockets, Mikune carburetor, tires....
The big question I have is regarding the crankcase blow by valve. The guy I got it from had a PCV on it. (tube from the crank case to the PCV which was mounted, poorly, in the space in front of the rear tire and engine) It came loose and the chain actually rubbed a hole in it over the course of a few rides. I removed it and ran the hose from the crankcase blow by valve to what I believe is the now unused air box under the seat. I can wipe out oil that collects in that reservoir. There is a nozzle there that the original owner plugged up with silicone. I think blow by valves in older cars just spat the excess gas/oil via a tube under the vehicle. (the Mikune carburetor's air intake/filter is outside this box, behind the right side panel. It doesn't untilize that box, if that is what it is for)
The big question I have is, what was the original configuration of the blow by valve/venting? Did the original blow by valve have have a tube running out of it? Was there a filter on the end of the tube? I can order parts from a place in Dallas, TX, but I'm not even sure how to refer to it.
Thanks for any help. I've enjoyed reading the forum.
|
Originally, these came from the factory with a hose running from the crank case to the air box with no filter of it's own. A lot of people had trouble with it spewing oil fog all over the paper element air filter that came with the bike. A paper air filter does not work once it gets oil on it. So, one of the reccomended fixes was to put a PCV valve in the line, and lead the end of it so that it would exhale the oil mist onto the rear chain. The PCV valve also reduced air pumping losses by keeping the crank case under a partial vacuum while running. This also makes life a little easier on the crank case seals. I think it is a good idea, but not everyone agrees with me....ARH