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TOPIC: Re:Knocking in Yamaha Roadstar Forum Tools Post New Topic Show latest posts Rules

#4971 CAPR06 (User) Fresh Boarder Posts: 13 Knocking in Yamaha Roadstar 2 Years, 9 Months ago   I recently purchased a new Yamaha roadstar silverado, 1700. It has logged around 140 miles. I'm starting to worry about a knocking noise that I believe comes from the engine. It only happens when the engine is hot (after about 25 minutes on). I have only added fuel once to the tank and I used premium gas. The sound is similar to a diesel engine knock. The sound starts when I accelerate and then stops as the engine RPM increases. There is no noise at idle. While cruising it does not make the noise until I add a little gas to keep the speed. Has anyone experience this. I know Vtwins are noisy but I'm uncertain if I have a problem. After all is a new bike. Thanks in advance.   Logged     The administrator has disabled public write access. #4976 DocShadow (Admin) Hmmmm .... send beer Admin Posts: 11040 Re:Knocking in Yamaha Roadstar 2 Years, 9 Months ago   That's a tough one to tell without hearing it. The bike does make more noise once it gets hot, especially if the air temp is high. You could take it to a dealer but I'd venture to guess he'd say &quot;It's normal&quot;. Where do you live? Also try posting on the R* Riders Forum. Maybe there's someone in your area could listen to it and give you an unbiased opinon. Doc   Logged     My Bike Website   The administrator has disabled public write access. #4993 aceman (User) Fresh Boarder Posts: 73 Re:Knocking in Yamaha Roadstar 2 Years, 9 Months ago   CAPR06 wrote: I have only added fuel once to the tank and I used premium gas. Don't put premium in unless you're running high compression pistons. This probably won't help your knocking issue, but premium gas in these low compresssion motors will cause you other problems. Tom   Logged     The administrator has disabled public write access. #4994 erizo (User) Gold Boarder Posts: 652 Re:Knocking in Yamaha Roadstar 2 Years, 9 Months ago   CAPR06 wrote: I recently purchased a new Yamaha roadstar silverado, 1700. It has logged around 140 miles. I'm starting to worry about a knocking noise that I believe comes from the engine. It only happens when the engine is hot (after about 25 minutes on). I have only added fuel once to the tank and I used premium gas. The sound is similar to a diesel engine knock. The sound starts when I accelerate and then stops as the engine RPM increases. There is no noise at idle. While cruising it does not make the noise until I add a little gas to keep the speed. Has anyone experience this. I know Vtwins are noisy but I'm uncertain if I have a problem. After all is a new bike. Thanks in advance. just out of curiosity, you ain't trying to run it at too low revs are you. it ain&acute;t a harley, and despite having a low setting on the rev limiter, roadstars do like their revs! 5th gear is mostly redundant below 50mph and trying to accelerate at that point will make a knocky clattery sound that will clear up as speed increases. i know it&acute;s just got 140 miles on it but give it some throttle without thrashing it during the break in period. `chugging&acute; a new motor can harm it as much as thrashing it.<br><br>Post edited by: erizo, at: 2006/04/11 10:07   Logged     be realistic - demand the impossible!   The administrator has disabled public write access. #4995 CAPR06 (User) Fresh Boarder Posts: 13 Re:Knocking in Yamaha Roadstar 2 Years, 9 Months ago   Doc, thanks for your advise. I live in Puerto Rico where the average temperatures are in the 80's. My father, who owns a 1990 Suzuki Intruder 1400 says that the problem is that the helmet I use does not cover the ears so what I'm hearing is the normal engine noise. I will try changing to another brand of gas to see if the sound stops. Again, it only happens when I accelerate and that is what guides me to think that it has to do with detonations in the engine.   Logged     The administrator has disabled public write access. #4996 CAPR06 (User) Fresh Boarder Posts: 13 Re:Knocking in Yamaha Roadstar 2 Years, 9 Months ago   It makes the sound in every shift when accelerating and the engine is hot. Even when advancing from stop in firs gear. Thanks for you advise guys.   Logged     The administrator has disabled public write access. #5000 ekonkjack (User) Senior Boarder Posts: 209 Re:Knocking in Yamaha Roadstar 2 Years, 9 Months ago   I have to go along with DocShadow, aceman, and erizo. I experienced the same thing during the breakin period. My 04 manual had shift speed suggestions that didn't make sense. If I followed the book, I ended up lugging the engine. At 3,000 miles the engine has gotten smoother and quieter but some of that might be due to an evolving operation pattern on my part. Fifth gear is only used at speeds above 55mph now. Oh by the way, after I modified the stock exhaust to stage one, I love to tach it up and hear the tones thus avoiding those low chugging rpm's.   Logged     New England rider since 1972,7th bike, EMT.   The administrator has disabled public write access. #5026 vegasdave (User) Gold Boarder Posts: 782 Re:Knocking in Yamaha Roadstar 2 Years, 9 Months ago   I just went over 3000 miles on my 06 RS.Put 300 miles on the 1st day,bought it in LA then drove it home to Las Vegas.Took it easy and tried to very my speed as much as possible.BIKE RUNS GREAT!! Anyway went to Arizona the other day and road without a helmet.Could`nt believe the noise the engine makes,hearing it for the first time.But with the way this bike runs can only think it`s natural.LOVE THIS BIKE IT RUN GREAT!!!Me and my buddy Frank on his Road King do a nice ride every sunday when we can and average 70 to 80 miles an hr!! One of my Bosses has a 01 Road Star says his will do 80 ALL DAY LONG!!Again I say!!LOVE THIS BIKE!!   Logged     If Your Not Moving Forwards,Your Moving Backwards Live To Ride,Ride To Live 06 Road Star Candy Red SMOKIN!!!!   The administrator has disabled public write access. #5028 Roadstar193 (User) Fresh Boarder Posts: 2 Re:Knocking in Yamaha Roadstar 2 Years, 9 Months ago   The &quot;knock&quot; is very common in the Roadstar. It is the topic of discussion on many forums. When I first heard it in my 99, I thought &quot;Oh crap, my engine is toast.&quot; That was 10,000 miles ago. It is no worse, no better. Only knocks when good and hot on a hot day but sounds for all the world like a rod knock. Apparently it isn't. Yamaha claims, I think, that it is a clearance issue with the generator shaft. I decided to ignore it. I notice it more now that I went from my Cobra pipes back to stock exhaust. Tom   Logged     The administrator has disabled public write access. #5032 USAFRETIRED (User) Moderator Posts: 159 Re:Knocking in Yamaha Roadstar 2 Years, 9 Months ago   Check the intake manifold for leaks real good. Jetting can also affect it. Mine did the same thing. First was a leaking intake, then after changing the carb it came back until I changed jetting.<br><br>Post edited by: USAFRETIRED, at: 2006/04/12 21:12   Logged     Patrick Racing 110 ci, Patrick Racing Ported Heads w/ Large Valves and Valve Springs, Speedstar Cams w/Roller Lifters, S&amp;S Super G Carb bored and DaVinci kit, D&amp;M Spike Air Cleaner   The administrator has disabled public write access.

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