crankcase venting question 2008 klr 650 - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

 
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post #1 of 3 Old 09-03-2008, 06:40 AM Thread Starter
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crankcase venting question 2008 klr 650

ok,,,this is gonna sound stupid but i have to do something,,,,i want to plug the case vent on the backside top of the engine and make a new vent in the oil cap with a tube running under the tank or somewhere not sure yet,,,,reason is because when i land a wheelie i get a big amount of oil all over the place,,,i had the vent ran from the back of the crankcase all the way under the tank shroud by the radiator,,,and still a leg full of oil and all over the bike just as soon as the front wheel touched the pavement,,,all in all what do we think would happen if i tapped the oil cap and made it the new vent,,,is their a better way,,,,and for the wise guys i know its easier just to quit riding wheelies,,,,but this is one of the reasons i like to ride my klr
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post #2 of 3 Old 09-03-2008, 09:01 AM
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How about a PCV valve? That might cure the problem.

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post #3 of 3 Old 09-03-2008, 09:38 AM
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Not familiar with the 08, but was the vent line originally to the airbox?

Problem I see with a one-way PCV valve (installed so that it would stop the oil flow ) is that if it stops oil flow, it would also stop crankcase gas flow -- which would be bad.

You might put a reservoir of some type in the vent line - collecting oil during the wheelie and then letting it flow back in normal position. Down side there is reducing oil volume, even temporarily, in the sump.

I see no reason you couldn't tap the filler plug and run a secondary vent hose and block off the original. Most NAPAs or other good auto parts stores will have a variely of brass fittings. A 1/4 threaded hose barb, the correct 1/4 inch tap and tubing are all you would need. I'd do the Mercedes PCV valve mod at the same time. And I would run it into the airbox.
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