otubrab
Member
FJR1300
My name is Ed Sorbo. I’m the service manager at Honda Yamaha of Redlands. We are located near San Bernardino CA. at about 1500 ft elevation. One of my customers has an ’07 FJR1300 that has already had its TPS replaced. He brought his bike in for it’s 4000 mile service and told me he was having a lean surge problem. I called Yamaha Tech for advice and learned about this site. I read the posts about the altitude surging problem. Today at 11:30 am I left the shop with a half tank of gas and took I-10 to the 30, the bike was warm by the time I reached the 30, I cruised between 80 mph and 100 mph on the 30 for about 10 miles and took the 330 up to Running Springs and about 7000 ft. I rode most of the way on the 330 in 4th gear reaching 80mph on a few short straights, I spent only a little time behind cars, my lowest speed was about 15mph behind a truck for less then one mile. The bike ran great until I got to the Running Springs exit, I was not sure where to go, I braked late and did not bother downshifting. When I rolled back on the throttle in the exit lane the bike surged badly and nearly stalled, I was still in 4th gear. After coming to a stop and going again in 1st gear the bike ran fine in town. Outside of town and back up to speed the bike started surging when I slowed down behind cars, I was again in 4th gear and under 3000 rpm, as soon as I downshifted to 3rd the rpm came up and the problem went away. From Running Springs I rode to Big Bear Lake and took Hwy 38 around the lake and back down to Redlands. Going around the lake I got stuck behind a school bus, the driver knew the road and the bus was empty but we still got as slow as 10 mph, I kept the rpm above 3000 and had no problems. On the way down the mountain the throttle response was a little abrupt in the just off idle range which requires a smooth hand when opening it after braking, but it was no worse than other stock bikes. I got back to the shop at 12:20 pm, the ride was 100 miles long. Max elevation was 8200 ft, max speed was 120 mph, min. speed was zero, average speed was 55.55.
This is what I think is happening: The bike has an amazing torque curve that lets you leave it in high gears, this leads to lugging and less than perfect throttle response at low rpm. All bikes are lean on the bottom so they can pass emission standards, I think this common slight leanness combined with lugging the engine causes this problem. I can make the problem continue by leaving the bike in a high gear and messing with the throttle or I can solve the problem by down shifting and bring the rpm above 3000. Pulling away from stop signs I noticed how smooth the power is on the bottom and found myself shifting early every time. I found that the surging is more likely to occur after high speed riding. I’m not sure that altitude really is part of the problem, it may be the type of riding we do up in the hills.
Overview: The bike is so smooth and torquey that it can be ridden in to low a rpm range. At low rpm all engines carburate at their worst, when the high load of chugging along in a high gear is added problems will occur. This problem can be exacerbated by prolonged high speed running just prior to the low rpm running. This exacerbation may be caused by unburned fuel in the intake track left there when the speed dropped quickly. Many bikes run way worse on the bottom than the FJR does, they just do it all the time so people know to keep the rpm up.
Solution: Don’t slow down, wait for the last braking marker for the gas station, nail the brakes, use big throttle blips on each down shift, ease off on the brake lever just before you flick it into the drive way, kick the side stand down before you even stop. After filling up pin it and tuck in! If you can’t ride like that all the time, down shift as you slow and keep your rpm above 3000 in 3rd gear and higher.
Follow up: My customer will pick his bike up tomorrow and he will make it surge then see if getting above 3000 fixes it for him. I will report his findings. You can try the same.
My qualifications: In order to judge my recommendations I feel that you need to know something about my experience. You can Goggle me to see my racing results. I was half owner of Sportbike Hawaii for 10 years, I started racing in ’84, I have won many races, club and national. I owned the race club in Hawaii and a Go Kart track. I made my living as a full time AMA 250 GP racer from ’98 till ’03 with a best race finish of 3rd. I was Chris Ulrich’s crew chief from ’04 till ’06. I work for "Roadracing World" as a rider and writer, I have two by lines "Ed Tech" and "Ask Ed." I’ve been the service manager at HYR since December of ’06. I work for HYR and get paid because people like this FJR customer pay us for our services. My job is to solve his problem and to keep him happy not to defend Yamaha or anyone else if they have a poor product. I will check this board a few times and try to answer any questions you may have. I’m troubled by the number of people who expect so little from there dealer and Yamaha and are so quick to criticize. I have found Yamaha to be honest and helpful, I hope my shop is viewed the same. Please include your full real name if you have any questions or comments for me.
Sincerely,
Ed Sorbo
Service manager
HYR
909 793-2833