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hi depending what bike it is all bikes are different
some bikes the carbs have little diaphragms fitted under a panel on the side of the carburetor
if the diaphragm has a tiny hole in it that can make your bike react like that
other than that a plug breaking down
or ignition timing may be out a little but that could also be down to a plug breaking down
indicates an ignition control/ coil problem that is happening when an internal component is breaking down from heat
take it in to a bike shop that handles your make and have it tested and properly diagnosed
This bike looks to be of the Lemond Revmaster series.
first, dial the resistance knob back until the leather break pad is no longer touching the flywheel. Get down on the floor and postion yourself between the flywheel and pedal cranks. Slowly turn the cranks arms and listen and feel for a roughness in the bike.
This has bike has bearings and a belt. It should not make any noise.
Check that your needle is centred when straight-stitch is selected and / or that you have the correct stitch-plate fitted. Is the needle breaking because it is hitting the stitch-plate or is it breaking when the needle goes down through the slot/hole in the stitch-plate. If you are sewing zig/zag or patterns, you must have a slotted stitch-plate fitted. If it's breaking when the needle passes below the stitch-plate, then take the bobbin /bobbin case out and the hook/shuttle and see if it still happens. If it does, the timing on your machine may be out and need professional adjustment. If it doesn'y happen after removing just the bobbin case, make sure the bobbin case is being correctly fitted.
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