missing a bit

[halfpint]

just back from holiday on the 1150 ,ran perfect there and back. went to work on it and it seems to hold back a bit ,at 2.5 revs it just seems to miss a bit above 3 ,it s fine ??seems to backfire more on over run any ideas .

 

[wayne]

just back from holiday on the 1150 ,ran perfect there and back. went to work on it and it seems to hold back a bit ,at 2.5 revs it just seems to miss a bit above 3 ,it s fine ??seems to backfire more on over run any ideas .

Try a new or good secondhand Lamber Sensor of new coil pack thats wot fixed mine

 

[Colban]

Single or twin spark?.
Any other mods?.