fadkar
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Post by fadkar on Aug 20, 2022 17:33:42 GMT -7
When I'm cruising in 4th gear, I notice slight pulsations coming from the engine. I feel it primarily through the footpegs in the form of vibrations.
Never happens in any other gear which is confusing me. Any ideas what it could be?
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weehe
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Post by weehe on Aug 21, 2022 10:28:02 GMT -7
Specific RPM range or throttle?
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fadkar
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Post by fadkar on Aug 22, 2022 13:44:53 GMT -7
Specific RPM range or throttle? Primarily 5-6k RPM. But as I pick up speed, the pulsations also get faster until they disappear from the normal engine vibrations. |
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Post by mt10orc on Aug 22, 2022 21:50:58 GMT -7
Have to ask do you feel any change in speed or torque when it pulses? How old is bike and miles on it? When did you do your last oil change?
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fadkar
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Post by fadkar on Aug 23, 2022 12:56:26 GMT -7
Have to ask do you feel any change in speed or torque when it pulses? How old is bike and miles on it? When did you do your last oil change? Nope, no change in speed or torque, the bike still pulls very strongly when I roll in the throttle. 2017 bike with 11k miles on it. Oil has 1500 miles on it (motul 7100). Just changed out the oil and sparkplugs out of good measure this weekend but that didn't do anything. I'm inclined to believe that it's just some resonant frequency that I'm feeling because there are no other issues that I'm noticing... |
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Post by mt10orc on Aug 23, 2022 19:00:39 GMT -7
Was thinking it might be coming from the clutch. Did you modify anything that may cause a vibration, such as exhaust, sliders? It’s really weird that it happens only between 4-5k. Thinking that something is a bit loose if it isn’t mechanical.
Are you hearing a different tone at all?
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weehe
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Post by weehe on Aug 24, 2022 10:07:10 GMT -7
I'm not sure off hand what speed 5-6k rpms in 4th is, but if you go that speed in 3rd or 5th it doesn't do the vibration? How does your chain and sprockets look?
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fadkar
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Post by fadkar on Aug 24, 2022 11:12:41 GMT -7
Was thinking it might be coming from the clutch. Did you modify anything that may cause a vibration, such as exhaust, sliders? It’s really weird that it happens only between 4-5k. Thinking that something is a bit loose if it isn’t mechanical. Are you hearing a different tone at all? I do have a M4 exhaust and sliders but those have been on for the last 6k miles. What in the clutch would cause these types of vibrations out of curiosity? The pulses are primarily between 5-6k RPMs but they get faster between 6-7k RPM and then start to become a constant vibration from the naturally higher engine speed above 8k rpm. |
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Post by mt10orc on Aug 24, 2022 14:27:26 GMT -7
Was thinking you may have some plate wear that can cause vibrations when engaged. If it increasing as RPM’s go up it’s probably mechanical in nature, was thinking maybe something wasn’t tight in exhaust or motor mount. Could be a slew of things from your description. Clutch, cam, rod bearings, transmission, loose mount, etc. maybe someone else has experienced this on the forum and will chime in. Would be good to hear what u are talking about, but that is rather hard if it only happens when under load.
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fadkar
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Post by fadkar on Aug 24, 2022 17:45:47 GMT -7
Was thinking you may have some plate wear that can cause vibrations when engaged. If it increasing as RPM’s go up it’s probably mechanical in nature, was thinking maybe something wasn’t tight in exhaust or motor mount. Could be a slew of things from your description. Clutch, cam, rod bearings, transmission, loose mount, etc. maybe someone else has experienced this on the forum and will chime in. Would be good to hear what u are talking about, but that is rather hard if it only happens when under load. Thanks for sharing your thoughts! Would any of those manifest as issues only in 4th gear though? That's the particularly perplexing part. And do you think it's worth paying thousands in diagnostic services (engine / transmission teardown) and weeks of down time off the bike to find the cause? Or just keep an eye on it for now and see if the issue gets worse over time? I'm waiting for my dealer to get a 22 MT10 SP anyways so I might just trade it in and let it be the dealer's problem early next year... |
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Post by mt10orc on Aug 24, 2022 22:51:18 GMT -7
If it’s just the one gear that it has the issue, then ride it like u stole it and let the chips fall where they may, or baby it in fourth and limit your time in that gear. My guess if it’s just the one gear it happens in then it’s probably an anomaly in the tranny. If it happened in all gears it would be probably something more major. It’s definitely a strange occurrence that is hard to diagnose on a forum, and is only speculation on my part what maybe the cause. I really wish I could give you golden advice.
I believe your thinking on keeping an eye on it is the best medicine at this point. If you are getting a new bike in the near future then dumping diagnostic money into it can be very expensive and is probably not the route u want to take. If you are good at wrenching you could always tear it down yourself and see if you can find the issue, but that isn’t for everyone.
Again if someone else here on the board has experienced your bike symptoms let us hope they chime in.
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fadkar
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Post by fadkar on Aug 28, 2022 7:41:18 GMT -7
If it’s just the one gear that it has the issue, then ride it like u stole it and let the chips fall where they may, or baby it in fourth and limit your time in that gear. My guess if it’s just the one gear it happens in then it’s probably an anomaly in the tranny. If it happened in all gears it would be probably something more major. It’s definitely a strange occurrence that is hard to diagnose on a forum, and is only speculation on my part what maybe the cause. I really wish I could give you golden advice. I believe your thinking on keeping an eye on it is the best medicine at this point. If you are getting a new bike in the near future then dumping diagnostic money into it can be very expensive and is probably not the route u want to take. If you are good at wrenching you could always tear it down yourself and see if you can find the issue, but that isn’t for everyone. Again if someone else here on the board has experienced your bike symptoms let us hope they chime in. Thank you, I appreciate your thoughts! I'll stick with our plan unless someone else who has experienced this chimes in. |
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bigpoppanoos
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Post by bigpoppanoos on Oct 3, 2022 17:25:07 GMT -7
I just bought a 2019 MT-10 two weeks ago and found this post. I've noticed a pulsing in 4th gear, and only 4th gear around 6k rpm, between 58-65mph. Wasn't sure if this was normal. Bike runs great. No modifications, and I've had another inline 4, an old Yamaha Maxim 650 that would vibrate around the same speed and RPM so I just figured it might be the nature of the beast. Hopefully it's normal!
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