Bike running poorly after a lay-up

I have a Yamaha SR125 which has been laid-up for over a year.

I took it out recently and gave it a service, oil-change, new spark
plug and battery.

However when I took if for a test ride it had no power. It runs
reasonably o.k. in first and second gear but in 3rd gear and above it
has no acceleration. It tends to 'chug' or 'bunny-hop' but that goes
after a couple of hundred yards. However the speed never picks up.
However if I clutch while it is bunny-hopping it seems to rev o.k.
This suggests that it is not a carb' or fuel mix problem.

My theory is that I have a slippling clutch. Does this sound
plausible. The clutch has only 2,500 miles on it so I wouldn't have
expected it to be worn out already. Could the fact that it sat unused
for over a year be the cause.

If I have a clutch problem is there any way of proving it short of a
strip down. And is there any solution for it other than a new clutch.

regards

MJW

 

My theory is that you failed to drain the gas and run it dry
so the carbs are filled up with varnish from the old evaporated
fuel. Drain any old gas from the tank and get the carbs cleaned.