| Author | Message | ||
     Thatdudejoe |
Hey bw bikers, I was hoping to pick your brains a little for ideas as to why my 98 S1 is blowing so much oil out of its crankcase breather. It seems to do it when it is revved over 5k rpm, which in my opinion is rediculous. However, it does not do this every ride; it seems to just be a once-every-few-months ordeal. What I have noticed is that once the oil initially comes out the end of the breather tube and exits the filter (located behind the oil tank and right before the rear brake light assembly), it seems to easily drip out every time the bike is revved above the 5k line. As I said previously, this problem only happens once in a while, but when it does, my entire rear fender, brake caliper, tire, rim, etc. is literally dripping oil. Aside from the fact that it is unsafe to ride on an oil-drenched tire, it ruins my ride because I start to worry about things like whether or not the motor is being starved of oil and etc. I bought the bike over a year ago with the breathers already installed (the second one looks to be coming out of the carb). | ||
| Buellistic |
Could be too much oil in oil system ... Stock oil system from dry to wet is 2 1/2 quarts ... This is the way that "i" have found to keep from over filling the oil tank when checking oil level ... Check my oil after a good ride, on the sidestand, engine running ... When you first pull the dip stick out the oil level on the dip stick is the level in the oil tank when riding(operating temperature) ... Then you want the oil level 1(one) inch from the sidestand side of the dip stick hole ... Be quick about your checking as the oil pump returns the oil back to the oil tank faster than it is pumped out with the dip stick out ... | ||
| Funjimmy |
Are you sure you are talking about engine oil? There is a tranny breather that runs from just behind the starter motor and exits up near the ignition module and fuse block. My S1 started blowing tranny fluid when revved above 5K too. Turned out to be the crackshaft seal. When the engine is revved that hign there is a lot of crankcase pressure caused by ring blow by etc. That crankcase pressure forces engine oil past the failing crankcase seal and into the tranny. With the tranny spinning up, the extra oil is sent through the tranny breather and onto your wheel. Buell updated the crankcase seal. Check it out. Cheer FunJimmy | ||
| Phelan |
Are you sure you are talking about engine oil? There is a tranny breather that runs from just behind the starter motor and exits up near the ignition module and fuse block. My S1 started blowing tranny fluid when revved above 5K too. Turned out to be the crackshaft seal. When the engine is revved that hign there is a lot of crankcase pressure caused by ring blow by etc. That crankcase pressure forces engine oil past the failing crankcase seal and into the tranny. With the tranny spinning up, the extra oil is sent through the tranny breather and onto your wheel. Buell updated the crankcase seal. Check it out. I think this is my problem on my S2. I'll have to check into it. | ||
| Bad_karma |
Joe Are you using much engine oil? Have you notice that the primary level is increasing? If so might be a fail crank seal. Joe | ||
| Thatdudejoe |
Tough I have not actually seen the crank seal in my bike, I am almost willing to say that that is most likely what the problem is. Yesterday I added about 3/4 quart of transmission fluid to the primary through the primary chain inspection cover and took the bike for a short ride. The transmission shifted much, much smoother and I am definitely beginning to believe in "Funjimmy's" theory. The guy I bought the bike from had some A+ mechanical skills and managed to strip the head of almost every fastener on the bike; so I was unable to check the exact level due to the fact that the four flat head cap screws (that are hex head on the bike, when the owner's manual says they should be torx headed (is that a word?); yet another clue that the original torx fasteners were most likely stripped out as well and replaced with the current flat head cap screws) on the clutch inspection cover are stripped out. I am just planning on getting a few more rides out of it before winter when I will then try to extract those 4 screws and check out what's really going on in there. Funjimmy, did you purchase the new seal from the dealer or an aftermarket parts supplier? | ||
| Funjimmy |
Joe I purchased the NEW seal from the dealer, and you should too. Harley updated that seal to cure the premature failure problem and you can’t be sure that the aftermarket suppliers have also updated their specs as well. My issue is gone. Thankfully! |
