Mortaza Posted November 9, 2021 Share Posted November 9, 2021 Hey so I’m I have a rattling sound coming from my engine located around the shims area I want to k if it’s common and if it’s a big problem I was just doing a wheelie and the bikes engine started rattling so Um I had a guy listen to it he said it’s either the Spuds like a shim has jumped out of the lifter housing. Lifter tick but also could be a sticky valve spring and I was wondering if anyone else have been thru that before it’s a 2020 mt07 Link to comment Share on other sites More sharing options...
M. Hausknecht Posted November 9, 2021 Share Posted November 9, 2021 Well, if its really the motor, this isn't good. Unless you damaged/bent a valve, I can't imagine a valve shim sneaking out of its retainer on a fairly new motorcycle. There could be an issue with the cam chain tensioner not putting sufficient tension on the cam chain, resulting in a rattling sound on rider's right side of motor just below the cylinder head. Having said that, again tough to imagine a tensioner going bad on a 2020 bike unless the motor is way down on oil. Again absent valve damage, there isn't anything to cause a "sticky valve spring". The motor also doesn't have hydraulic valve lifters (it merely has buckets that sit in their bores and follow the cam lobes) that can get noisy or "tick". If a bucket is making noise, most likely cause is damage to the bucket bores or cam lobe faces due to significant lack of lubrication. Putting aside the rattling sound, how does the motor run? Idle smoothly? Any other symptoms besides the rattling? How much oil in the motor? Has anyone been inside the motor? Any modifications (you're running an air filter)? Absent any additional relevant info, if it was mine, I'd do a compression test on both cylinders; also checking the spark plugs for possible damage. Good luck! 1 Link to comment Share on other sites More sharing options...
Mortaza Posted November 9, 2021 Author Share Posted November 9, 2021 55 minutes ago, M. Hausknecht said: Well, if its really the motor, this isn't good. Unless you damaged/bent a valve, I can't imagine a valve shim sneaking out of its retainer on a fairly new motorcycle. There could be an issue with the cam chain tensioner not putting sufficient tension on the cam chain, resulting in a rattling sound on rider's right side of motor just below the cylinder head. Having said that, again tough to imagine a tensioner going bad on a 2020 bike unless the motor is way down on oil. Again absent valve damage, there isn't anything to cause a "sticky valve spring". The motor also doesn't have hydraulic valve lifters (it merely has buckets that sit in their bores and follow the cam lobes) that can get noisy or "tick". If a bucket is making noise, most likely cause is damage to the bucket bores or cam lobe faces due to significant lack of lubrication. Putting aside the rattling sound, how does the motor run? Idle smoothly? Any other symptoms besides the rattling? How much oil in the motor? Has anyone been inside the motor? Any modifications (you're running an air filter)? Absent any additional relevant info, if it was mine, I'd do a compression test on both cylinders; also checking the spark plugs for possible damage. Good luck! The motor runs the same as before but with a rattling and the sound is coming from that area the motor was low on oil when it started so I put in 1.6 litres more of oil. No one has been inside the motor yet. Only mods an exhaust, pro taper handle bars and a stunt cage but I will definitely check both the compression and the spark plugs the bike has done around 13000kms Link to comment Share on other sites More sharing options...
Triple Jim Posted November 9, 2021 Share Posted November 9, 2021 (edited) The engine was 1.6 liters low on oil? That's very low, especially if you're doing wheelies that could let the pump pick up air. Did you see the low oil pressure warning light flashing? Edited November 9, 2021 by Triple Jim 1 Link to comment Share on other sites More sharing options...
Mortaza Posted November 9, 2021 Author Share Posted November 9, 2021 8 minutes ago, Triple Jim said: The engine was 1.6 liters low on oil? That's very low, especially if you're doing wheelies that could let the pump pick up air. Did you see the low oil pressure warning light flashing? Yes I did but I’m gonna do an oil flush in about a week then do a compression test but first thing in the mourning definitely will check the spark plugs Link to comment Share on other sites More sharing options...
Triple Jim Posted November 9, 2021 Share Posted November 9, 2021 (edited) Things like main and rod bearings and cam lobes are what's likely to be damaged from insufficient lubrication, not ring seal or spark plugs. That warning light is a serious thing, not to be ignored. How did a 2020 MT get so low on oil? Edited November 9, 2021 by Triple Jim 1 Link to comment Share on other sites More sharing options...
Mortaza Posted November 9, 2021 Author Share Posted November 9, 2021 (edited) 28 minutes ago, Triple Jim said: Things like main and rod bearings and cam lobes are what's likely to be damaged from insufficient lubrication, not ring seal or spark plugs. That warning light is a serious thing, not to be ignored. How did a 2020 MT get so low on oil? Stunting and it has a rear sprocket of 60 teeth so really redlining it would be the problem on y it was low and aswell the sound is coming from the top not the middle or bottom but I will check the compression and if it’s different then will have it check out Edited November 9, 2021 by Mortaza Link to comment Share on other sites More sharing options...
AP996 Posted November 9, 2021 Share Posted November 9, 2021 Low on oil, wheelies, high revs then rattling engine, Sorry but I think that motors going be quite sick. 2 Link to comment Share on other sites More sharing options...
M. Hausknecht Posted November 9, 2021 Share Posted November 9, 2021 Just now, AP996 said: Low on oil, wheelies, high revs then rattling engine, Sorry but I think that motors going be quite sick. Ummmm yeah, sorry I have to agree. Plugs aren't directly relevant but if a valve is bent, you might find some aluminum on the electrodes. Main and rod bearings,and cam journals need constant oil pressure. I wonder how the oil smells; it could've gotten very hot, further contributing to the lack of lubrication. 1 Link to comment Share on other sites More sharing options...
Mortaza Posted November 10, 2021 Author Share Posted November 10, 2021 7 hours ago, AP996 said: Low on oil, wheelies, high revs then rattling engine, Sorry but I think that motors going be quite sick. The thing is the bike has been wheeling it’s whole life since they first got it it’s a stunt bike so what’s the difference now Link to comment Share on other sites More sharing options...
Global Moderator mjh937 Posted November 10, 2021 Global Moderator Share Posted November 10, 2021 16 minutes ago, Mortaza said: The thing is the bike has been wheeling it’s whole life since they first got it it’s a stunt bike so what’s the difference now I think the biggest difference is the low oil level, also an engine can only be abused for so long before something breaks. I hope it does not end up being an expensive fix for you. I am curious what you find. 2 Link to comment Share on other sites More sharing options...
shinyribs Posted November 10, 2021 Share Posted November 10, 2021 56 minutes ago, Mortaza said: The thing is the bike has been wheeling it’s whole life since they first got it it’s a stunt bike so what’s the difference now Pristine, showroom condition bikes sure are nice. But well ridden, banged up bikes that have given their riders lots of fun have a cool factor that speaks for itself Sounds like all you can do is start doing a visual inspection at this point. Easy to pop off the valve cover to take a look. If that don't pan out, engine side covers next before having to drop the whole engine. Good luck, man! And keep us posted on what you find so the rest of us can learn from it. Hoping it's nothing too bad for you Link to comment Share on other sites More sharing options...
Mortaza Posted November 10, 2021 Author Share Posted November 10, 2021 39 minutes ago, mjh937 said: I think the biggest difference is the low oil level, also an engine can only be abused for so long before something breaks. I hope it does not end up being an expensive fix for you. I am curious what you find. I’m getting it diagnosed on Monday then I will let u k what’s wrong 1 Link to comment Share on other sites More sharing options...
AP996 Posted November 10, 2021 Share Posted November 10, 2021 6 hours ago, Mortaza said: The thing is the bike has been wheeling it’s whole life since they first got it it’s a stunt bike so what’s the difference now Wheeling and stunting no problem, not enough oil pressure= big problems. 2 Link to comment Share on other sites More sharing options...
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