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My beloved blue gal is limping, clutch or air?

Hello all. I need help.

Recently my beloved Suzuki VZ800 Marauder has seemed a bit lacking in top speed, struggling to top 70Mph on the highway. I was thinking I was just overdue for a tune up, or air filter change. 

About two days ago she couldnt get past 60MPh on the freeway, when coming up a bridge I topped at 40Mph. This was with the RPM and engine sound being the same as always, not particularly racing, or sputtering. 

Then from stoplights I would accelerate lightly from 1st, to get passed by cars going 10-15MPH. Acceleration seemed lacluster in any gear. RPM would rev fine, but barely any acceleration. Even when shifting up. 

Every once in a while the bike would slip and shift down from 2nd to N, or 4th to 3rd. WIthout the throttle being too far open. 

When shifting the shift seemed a bit clunky, but not stuck at all. 

It's almost as if I'm dragging a few thousand pounds behind the bike at all times. 

I was thinking that my bike is in need of a clutch plate change. The symptoms seems to fit and the previous owner sometimes ran it low on oil. 

But an old Harley rider who's been riding for decades swears it's the Air Flow sensor. 

Does anyone have any advice or possible diagnostic tricks? 

I don't have the money to get her diagnosed and buy the parts to fix. 




First thing you need. Download and save. No bucks sucks.
Start with Chapter 10.

I checked out your link, much better than the basic manual I had. So thanks.
I was able to find out that if I end up replacing my clutch cover gasket that I should not use gasket seal. But still confused as if the clutch is the issue, or as some have now suggested, bad gas.

Drain and refill the gas .Be carefull.

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