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DannoXYZ · June 11th, 2019, 11:27 AM

Timing-chain connects crankshaft to the camshafts. This spins the camshafts which opens and closes the valves

Not very likely timing-chain wore out in just 27k-km unless there was severe maintenance neglect. No it would have to be intentional abuse with putting sand into crankcase in order to wear out chain. If chain was worn out with this little mileage, your piston-rings, valves and bearings would also be worn out. Engine would smoke and sound like a shaking bucket of rocks! There are many examples of these bikes with 150k-km and chain is fine with just valve-adjustments needed. If they didn't give you specifics on why it needs to be replaced, it's a kak diagnosis.

If it's not too late, take bike elsewhere for 2nd opinion.

Stalling is probably not related to timing chain. Most likely a vacuum leak throwing off MAP-sensor. If it does it more when cold, could be ECT sensor not detecting cold-engine properly and ECU not using cold-start enrichment. Could be idle-speed not set correctly. Any number of things. Competent shop can get dash to blink error-codes to troubleshoot (if there's any stored from past events).

June 11th, 2019, 11:27 AM	#2
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Timing-chain connects crankshaft to the camshafts. This spins the camshafts which opens and closes the valves Not very likely timing-chain wore out in just 27k-km unless there was severe maintenance neglect. No it would have to be intentional abuse with putting sand into crankcase in order to wear out chain. If chain was worn out with this little mileage, your piston-rings, valves and bearings would also be worn out. Engine would smoke and sound like a shaking bucket of rocks! There are many examples of these bikes with 150k-km and chain is fine with just valve-adjustments needed. If they didn't give you specifics on why it needs to be replaced, it's a kak diagnosis. If it's not too late, take bike elsewhere for 2nd opinion. Stalling is probably not related to timing chain. Most likely a vacuum leak throwing off MAP-sensor. If it does it more when cold, could be ECT sensor not detecting cold-engine properly and ECU not using cold-start enrichment. Could be idle-speed not set correctly. Any number of things. Competent shop can get dash to blink error-codes to troubleshoot (if there's any stored from past events).