| Author | Message | ||
     Nallac |
Hi posting this for a friend, he has posted it KV but i thought it'd be good here as well.Any ideas?.I haven't seen the bike yet but will be giving Jeff a hand to fix it with any luck. Tena Koutou no Aotearoa. Greetings from New Zealand. Can't say enough about the work forums like u and Buellers Downunder do! Anyhow, im no mechanic but i have an issue with my 05 Buell Lightning. I think its a common issue?? Here's the deal...went to start one morning and POP! lost a cylinder. took the plug out and replaced, but compression was way low. Rode about 10miles and engine light came on. Luckily i was riding to the shop! They did a compression test and, suprise suprise, bad compression. I cant afford the shop to work on it, but heard that this does happen around 20,000miles. So my question is, might there be something specific to be looking for?? Otherwise, when its taken apart, what should i look at doing/replacing? Ill get a local mate to give me a hand, he's got an X1, just did his cylinder head. Cheers for any info!! | ||
| Glitch |
heard that this does happen around 20,000miles I guess I'm 50,000miles overdue? Never heard that one before. He'll have to tear it down. Rings and at least hone the cylinder walls. Unless it's something else. Sorry for the lack of help, but some things just have to be looked at for a proper diagnosis. | ||
| Strato9r |
Before tearing things down, try a couple of easy tests to see where the compression is being lost. First, squirt about a tablespoon of oil down the bad cylinder, then re-do the compression check. If the numbers get a lot better, then there is probably a ring seal problem. If it doesn't change much, then a valve is probably leaking. Since the problem occurred suddenly, it seems possible that something is stuck on the face of a valve seat, hopefully not something metallic! What was the appearance of the original spark plug that came out of it? If there was a lot of deposited material on it, carbon or gummy deposits can, and do occasionally find their way onto a valve seat (usually the exhaust seat). How was it running before the check engine light came on? A leaking exhaust valve would cause a power loss and a definite noise in the exhaust. A leaking intake valve would be chaos; popping back through the airbox and totally confusing any sensors on the intake side of things. Hopefully this helps narrow things down a bit, and it turns out to be nothing too serious. |
