NHTSA Preliminary Evaluation PE15014

This PE was opened after NHTSA received 10 owner complaints alleging vehicle control was compromised due to inconsistent throttle control in MY 2012-14 Honda GL1800 motorcycles.Typically during the first five minutes of operation (cold engine), riders would experience a pronounced engine stumble when operating the bike at low speeds and minimal throttle applications.Riders were concerned that this scenario would result in a crash if the stumble were to occur while making a sharp turn at low speed.Since opening this investigation we discussed the issue with Honda motorcycle dealers and service personnel and subject vehicle owners / complainants.We test rode one complaint GL1800 and monitored web forum activity.Based on the information gathered, the issue of low speed engine stumble in these motorcycles does not appear to jeopardize safety.The absence of crashes in a population of vehicles with up to 4 years in service indicates riders are able to instinctively correct for any control issue that may accrue from a low speed cold engine stumble.In the absence of a actionable defect trend, we are closing this PE.We continue to monitor complaints and other information sources for any data that may alter this finding.If such information is found, we will respond accordingly.The ODI reports cited above can be reviewed at: http://www-odi.nhtsa.dot.gov/owners/SearchNHTSAID using the following complaint identification numbers: 10785837,10783109,10781852,10760402,10670092,10662128,10653041,10643482,10641998,10639635,10639538,10639483,10633401,10633110,10632624,10632569,10631910,10621114,10577493,10572733,10550566,10549745,10548741,10548568,10546436,10532817,10532620,10532347,10532553,10532249,10531538,10523914,10523890,10523515,10523017,10512486