Restricted???

[Silverlegacy]

Silverlegacy, what you're describing sounds pretty much exactly like my son's Fazer 600 when we had it restricted to 33bhp for him.

The restrictors are 4 big steel "washers" which just slot in the carb mouths - so that when the throttle is wound fully open, there's only the hole in the middle letting air through, and it's only about 1/3 of the size of the carb mouth.

This means that no matter how far you wind the throttle open, things happen slowly after 5k / 6k RPM's, especially in the top two gears.

Cruising on the motorway at 70 didn't leave much in reserve for instant overtaking.

If, when you're riding it, the bike performs reasonably well on part throttle, but it just doesn't seem to do anything more when you wind the throttle past halfway, I'd say your bikes restricted - as long as it runs cleanly and doesn't misfire.


Maybe just take off (or pull back) a carb inlet rubber and you'll soon see if there's a washer stuck in the carb mouth - the aperture left open on our sons bike was probably less than about 20mm diameter.

Thanks for the info.
I was going to look and see if i could see down the carb rubbers but all looks a bit complicated to me, i took tank off to check air filter and other little bits but just cant see how to check that with out stripping off lots of stuff, and think its a bit beyond me.
I have found a local place who will dyno it for me for £45, so hopefully going to get that booked in Tuesday next week.
Hopefully I can pinpoint the issue, the bikes fine and below 5-6k and a joy to ride under 50mph, just beyond that its not so fun.