My M750 sounds like a little cruiser??

ZachDDill · November 25, 2011, 01:14:04 PM

So about a week ago I was on like a 30 mile ride and she started giving me problems, eventually I had to pull over because the engine cut off. Ever since then my bike hasnt been sounding right, when I idle It kinda rumbles like a cruiser does. Also when I am at speed it sounds more whiny, does anybody know what this could be from?

MongoReturns · November 25, 2011, 01:50:47 PM

I'd make sure the belts are ok (ticks lined up) then check the synch on the carbs. Could be a valve issue, but that's somebody else's department.

ZachDDill · November 25, 2011, 01:52:36 PM

Quote from: MongoReturns on November 25, 2011, 01:50:47 PM
I'd make sure the belts are ok (ticks lined up) then check the synch on the carbs. Could be a valve issue, but that's somebody else's department.

I don't know how to do any of that.

MongoReturns · November 25, 2011, 08:02:22 PM

Well, taking the belt covers off isn't hard, just time consuming. There's little marks on each of the cams, and they all line up when it's right. Also your belts may be crazy loose - checking them isn't hard either, there's great info at ducatisuite.com.

Synching carbs is harder. Chances are, unless something's living in your airbox (under the tank), it's not an easy problem to diagnose.

Howie · November 25, 2011, 08:25:41 PM

Is the bike running on both cylinders? Hint: A running cylinder is hot, a non running cylinder is not.

matmcd78 · November 27, 2011, 12:33:08 PM

Had similar problems recently. Ended up being a fouled plug. Might be a good place to start.

ZachDDill · November 27, 2011, 05:08:01 PM

Quote from: matmcd78 on November 27, 2011, 12:33:08 PM
Had similar problems recently. Ended up being a fouled plug. Might be a good place to start.

I replaced my plugs (for the third time) yesterday and that seemed to help but still not at 100%

Howie · November 28, 2011, 05:22:51 AM

Quote from: ZachDDill on November 27, 2011, 05:08:01 PM
I replaced my plugs (for the third time) yesterday and that seemed to help but still not at 100%

How did the plugs look? Got a photo?

ZachDDill · November 28, 2011, 11:50:37 AM

Quote from: howie on November 28, 2011, 05:22:51 AM
How did the plugs look? Got a photo?

I tried to take a picture but I couldn't get it to focus, the tip of the plug that went into the engine was pretty much black. Like it was burnt.

koko64 · November 28, 2011, 01:54:36 PM

How many miles on the clock?

Howie · November 28, 2011, 02:03:48 PM

Powdery black is carbon from running rich, a shiny, thick coating is oil, wet, smells like gasoline, rich or misfire. Overheated would be white, perhaps blistered insulator, excessive electrode wear, and, in extreme cases, insulator broken.

ZachDDill · November 28, 2011, 07:28:28 PM

Quote from: koko64 on November 28, 2011, 01:54:36 PM
How many miles on the clock?

around 33k

koko64 · November 28, 2011, 07:42:25 PM

If those plugs are fouled from the a/f mixture being too rich at low speed and cruising then theres a good chance your carbs need new needle jets. Its quite common.

ZachDDill · November 28, 2011, 07:48:08 PM

Quote from: koko64 on November 28, 2011, 07:42:25 PM
If those plugs are fouled from the a/f mixture being too rich at low speed and cruising then theres a good chance your carbs need new needle jets. Its quite common.

How do I do that?

koko64 · November 28, 2011, 09:57:57 PM

You have to pull the carbs out of the bike and rebuild them with new needle jets. Ducati suite, ducatitech sites and a Haynes manual show you how. There would be a few threads to search on the topic here as well.

Its not a tehnically difficult job, but a real pain in the arse removkng the air box, etc.

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My M750 sounds like a little cruiser??