Bike cuts out after reving?

[Trip]

Yesterday i noticed a distinct lack of power when winding on the throttle it just judders at about 3k. Kept having to change gear to keep the revs down.

My mates dad changed the chain and sprockets yesterday and ive noticed it since then.

Its been leaking oil for a while but not lots dont know if this is connected to it.

After starting it up on the centre stand today after reving it it died.

Its been cutting out when i first start it and drop it into first.

Now my mum suggested dirty plugs which im going to check but it idles fine it just wont rev.

Any ideas guys please?
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Bike: Yamaha XJ600N Mileage: 28500 Miles Rider Mileage: Many Miles
CBT: PASSED Theory: PASSED Test: PASSED
Past-CG125 Present - Yamaha XJ600N Future - WHO KNOWS?

[stinkwheel]

When did you last look at the air filter?
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Trip]

Didnt know it had one.

Its a Yamaha XJ 600N

Could that be whats causing it then Stink?
____________________
Bike: Yamaha XJ600N Mileage: 28500 Miles Rider Mileage: Many Miles
CBT: PASSED Theory: PASSED Test: PASSED
Past-CG125 Present - Yamaha XJ600N Future - WHO KNOWS?

[stinkwheel]

It wouldn't be impossable. Divvys especially have been known to dump a load of oil into the airboxes through the crankcase breather on occasion which does nothing for their ability to draw air into the engine. Not saying that's the problem but it's worth having a look in there anyway.

Not knowing it had one means it may not have been cleaned/replaced for some time? It might have done what the one in my GPZ did and now has loads of foam bunging up the carbs.
https://i48.photobucket.com/albums/f216/stinkwheel/airfilter.jpg
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Trip]

Ah would that be the tube comming down from beneath the petrol tank?

The perhaps yes there has been some oil comming from there i think.

Wont have been touched since at least september.
____________________
Bike: Yamaha XJ600N Mileage: 28500 Miles Rider Mileage: Many Miles
CBT: PASSED Theory: PASSED Test: PASSED
Past-CG125 Present - Yamaha XJ600N Future - WHO KNOWS?

[Trip]

Could it be cured by an oil change do you think?

How do i get at the air filter stink?

Cheers
____________________
Bike: Yamaha XJ600N Mileage: 28500 Miles Rider Mileage: Many Miles
CBT: PASSED Theory: PASSED Test: PASSED
Past-CG125 Present - Yamaha XJ600N Future - WHO KNOWS?

[stinkwheel]

Don't really know. You might be able to take the top or side off the airbox. Not really sure what else would need removing to get at it because I've never worked on a divvy.

The crankcase breather will be a tube running between the top of the engine and the airbox (usually directly under the carbs in the middle.).

What concerns me is that your air filter could be in a shit state. You can't tell unless you physically look at it. It is a routine service part and so should be reasonably easy to get at.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Trip]

Gonna do it later stink.

Seems to be a common fault with the divvy's

Thanky
____________________
Bike: Yamaha XJ600N Mileage: 28500 Miles Rider Mileage: Many Miles
CBT: PASSED Theory: PASSED Test: PASSED
Past-CG125 Present - Yamaha XJ600N Future - WHO KNOWS?