| Author | Message | ||
     Paul_in_japan |
Long story short- My XB12R is in the shop to sort out an idleing, surging, problem thats being bugging me for a few months. The mechanic is good and thorough, and has already checked and tested every little thing the Knowledge Vault had suggested to check finally the intake seals and O2 sensor were replaced. The problem now is the pool of oil he discovered in the bottom of the throttle body (mainly the front cylinder) when he first pulled it apart. He since cleaned it out then ran the bike with the breather tubes aside only to find more oil in the bottom. My bike has always been a big oil consumer (one of the highest on record on this forum) since its purchase. I guess now I know where the oil is going. My question is what now needs replacing/ fixing and is it likely to be expensive. My knowledge of this part of the engine is minimal. Id image some sort of top end overhaul is in need? is this a big job on these bikes? I found a similar thread here http://www.badweatherbikers.com/buell/messages/327 77/276122.html but im not sure what the verdict was. any thoughts? | ||
| Sgthigg |
Sorry to hear your having so many troubles. I thought they already replaced the intake seals?? Anyways I think the only way it can get into your throttle body is by it blowing in there from the breather(puke)tubes. I thought my bike "consumed oil too. The error was trying to use the factory dip stick to measure the oil. To actually know the proper oil level you MUST do this. -run bike till hot -drain all oil and replace filter -add exactly 2.5 qts -run till hot 15 minute ride(not idle) -pull over and remeasure you oil with something you can read the oil line on and MARK it. What I did was I cut a piece of white sheet metal into "T" shape. This is you proper oil full level. Until you do this and ditch the factory dip stick method, your ALWAYS going to think you consume oil. I was using exactly 1.48 onces of oil every 50 miles. Or so I thought until I did this and saw I was over filing it and it was actualy puking it out at the rate..I also has some rough running and cough every now and then too. Well hope this helps Good luck | ||
| Id073897 |
If the breathers were put aside and there's still oil in the manifold, leaky valve seals/valve guides could be a reason. A test is simple: drive at high revs and close throttle, then the vacuum draws oil into the inlet. If it's much, then you will get blue smoke (perhaps you do remember some old BMW cars, who did this frequently). Regards, Gunter | ||
| Jos51700 |
I've never had oil consumption on any XB by overfilling using the factory dipstick..... IDbunchanumbas is on the right path. Sometimes the blue smoke is hard to see, but this process was verifiable through oil consumption on thousands of HD's and the required new valve guide seals are a pretty orange color. | ||
| Sgthigg |
Jos...You might not have, but if you do some searching on here you will quickly see that the factory dip stick is something that has quite often caused over filled oil scenarios on XB's. If here ran it with the breather hoses aside. The valve guides like Id0 said would be my next step also. | ||
| Paul_in_japan |
thanks for the help guys- The problem is not an overfilling issue- Ive done the proper oil check (replace oil with exactly 2.5 quarts and measure and the stick reading was prefect). Ive never been able to maintain this level though. The bike was run with the breather hoses aside so they were unable to contaminate the intake. So it looks like i need to replace the valve seals? and valve guides? sounds expensive. Does this mean the valves themselves might need replacing too? At 10,000miles on the clock should i be getting the rings done while im at it? | ||
| Jos51700 |
A leak-down test before teardown will tell you if the rings are bad, and you can check the valves and guides (and more specifically, the clearance) when you tear down to replace the seals. The factory guide clearance is, well, usually poor, and sending your heads to T-man in Tennessee will net you a GREAT port job in the process if you want to clean up those guides..... But I'm guessing new seals will make it all happy. It is possible to replace the seals without pulling more than the rocker boxes, if you're interested, but a nice inspection of pistons, rod bearings, etc, is always nice. Maybe people should get their info from me instead of BadWed.  I've service hundreds of different Buells, and thousands of HD's, and never had an overfill issue on a single one of them. I've never used anything other that the factory dipstick. Just 'cuz it's on BadWeb, doesn't mean it's right..... |
