Can an inline 4 engined bike be made to behave more like a V-twin engined bike?

[Drew]

And use the 2 spare cylinders as a supercharger

I think this has been done a bit, but is too inefficient to make any gains. I could be wrong though, I dismissed the idea on the grounds that, there is no substitute for cubes!

[ducatilover]

I think this has been done a bit, but is too inefficient to make any gains. I could be wrong though, I dismissed the idea on the grounds that, there is no substitute for cubes!

Usually won't work well because the pulse is out of sync with two of four cylinders

[Tigadee]

Got a question about my XJ400 - It sounds like a buzzsaw, where is it likely to be coming from? Any ex-XJ400 owners who might know? (OK that's two questions...)

It almost sounds like a loose fairing, but there's none that I can see or feel. Could it be the exhaust? Or the engine?

What can I do about it?

[ducatilover]

Does it get worse when you go faster, or with engine revs, or with engine load?

[avgas]

I think this has been done a bit, but is too inefficient to make any gains. I could be wrong though, I dismissed the idea on the grounds that, there is no substitute for cubes!

Yep there is...
http://thekneeslider.com/archives/20...le-conversion/

[Tigadee]

Does it get worse when you go faster...

It's pretty constant throughout, though at faster speeds it's a bit harder to hear it but it's still there.

...or with engine revs, or with engine load?

What's the diff between the two?

[ducatilover]

It's pretty constant throughout, though at faster speeds it's a bit harder to hear it but it's still there.



What's the diff between the two?

Load is the amount of throttle. Big throttle at low/mid rpm will be big load, like going up hills, doing skids...
Is it making the noise when you're not moving?
If not, check the chain, chain guard and overflow/vent hoses under the bike.

[Tigadee]

Load is the amount of throttle. Big throttle at low/mid rpm will be big load, like going up hills, doing skids...

Oh, thanks.

I think does it in both at speed or under load. I'll have a careful listen when going home tonight...

Is it making the noise when you're not moving?

No, only when the engine is revving.

At idle, it just sounds like an un-sexy motor engine...

If not, check the chain, chain guard and overflow/vent hoses under the bike.

Will do, sir... Cheers.

[ducatilover]

If it increases in frequency with the engine speed, it's a noise before the gearbox, if not it's in the running gear somewhere or just a loose fitting.
It could be cam chain tensioner rattle.

[Drew]

I'd bet a dollar, that the noise is coming from one of the chrome heat shields on the exhaust pipe. Down by the pegs like.

If I were a betting man of course.

[nodrog:Me]

Oh, thanks.

I think does it in both at speed or under load. I'll have a careful listen when going home tonight...



No, only when the engine is revving.

At idle, it just sounds like an un-sexy motor engine...



Will do, sir... Cheers.

If its as gay as a S40 Boulevard it will be the springs that hold the dash cluster into the tank, I just filled mine up with silicone.

[Tigadee]

If its as gay as a S40 Boulevard it will be the springs that hold the dash cluster into the tank, I just filled mine up with silicone.

Not that I'm saying you're right, but I will check it...

I'd bet a dollar, that the noise is coming from one of the chrome heat shields on the exhaust pipe. Down by the pegs like.
If I were a betting man of course.

Of course.... *sneaking off to check heat shields*

[ducatilover]

I'd bet a dollar, that the noise is coming from one of the chrome heat shields on the exhaust pipe. Down by the pegs like.

If I were a betting man of course.

Up that to a beer, because I like beer and I'm a fool.

[Tigadee]

OK, definitely two sounds: One comes from the right exhaust pipe, somewhere inside it seems. The other from the front, either engine or dash area as Drew suggested.

Need more time to pinpoint...

[ducatilover]

Can you take your muffler off? Could be a stone in there.