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Discussion Starter · #1 ·
Hey guys! So I took my wheeler for a ride today. I got about ten miles from home and stopped to light a smoke and man oh man was there a ticking coming from the head. It sounded more like it was from the intake side but it's impossible to really tell. . It has the correct amount of oil in it. I check before every long ride. So I'm home now and I just checked the valve spacing and it's spot on so I know that isn't it. Any ideas on what it could be? There is oil in the head but not as much as i remember from the other times i checked the valves. Oil pump maybe? Is there a way to check that?I just changed to full synthetic and It's been running great. Thanks.
 

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Hmmm... 87 has the cable decompression hookup from the kickstarter. Did that short cable get poked by a stick or something and take all the slack out of it? Did the adjustment nuts come loose or the cable bracket get bent? If the cable gets pulled tight for any reason the decompression cam will be contacting the rocker arm while its running and make quite a racket.
 

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Could also be timing chain slap. Or a failed tensioner. When you adjusted valves did you use your finger and try to move the tappet and see if it was making alot of noise that way? I just had this happen on my 400ex and have the rocker arms and shafts on order because they were at or passed the service limit. Havent confirmed its going to fix it yet but its somsthing to think about. My .02
 

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Discussion Starter · #4 ·
I thought of that too but upon reassembling everything after reinstalling the valve cover last time I was having such a hard time getting the cable back on the decompression lever that I left it disconnected. It was and is fully forward, so not contacting anything. It was the first thing I checked once I heard the noise. A horrible ticking noise though! I'm going to reinstall the motor bracket and start it to see if that will lead me anywhere.
 

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Discussion Starter · #5 ·
I just had the tensioner out recently less than two weeks ago and it was in good working order then. The cam chain is stretched, but has life still in it. I'm not sure what you mean about the tappet though? You mean wiggling it side to side? I just started it again and it is definitely tapping up there in the head something awful. I'm yanking the valve cover off now...
 

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Discussion Starter · #6 ·
Does anyone know what else would make such a tapping noise? I mean it wasn't overly hot or anything. Do valves get bent sometimes just cause they're old? Would a bent valve make that noise??? I decided to go for another ride and enjoy the rest of the daylight. I'm going to wait both for dark and hopefully to hear back from you guys any ideas you may have of what could be making the noise. Thanks again. I hate not riding my honda...?
 

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The tappet is another name for the valve adjuster. I would be pulling the valve cover for sure. Could have a exessively worn rocker arm or cam lobe.
 
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Discussion Starter · #8 ·
Haha I know what a tappet is, I was asking about when you asked me if I could move the tappet with my finger and did it make noise that way? I wasn't sure what you meant. I just had the cover off a week or two ago and while I didn't completely disassemble the cam and check tolerances everything looked good. Pretty hard to see a thousandth of an inch though. ?. I'm just looking for any suggestions of what could make a tapping noise in the head. Especially with the valves adjusted properly. Thanks again!
 

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I i gotcha. Well what i was talking about is on my 400ex. Which this could be different. When i adjust the valves after i torque the lock nut down. I take my finger and put it at the end of the rocker arm and try to snap it up and down rapidly. If it makes noise that way its gunna make alot of noise while running. I just had this exact thing happen and i have a tread about it called 416ex weird valve adjustment issue. After adjusting valves perfectly on multiple attempts i couldnt get one valve to quiet down. It sounds like a sewing machine. I finally broke down and removed the valve cover and all the rocker arms and shafts. I mic'ed all of them to find the one i cant quiet being passed the service limit on the shaft and rocker arm. All the other ones are just at the service limit. So i ordered all of the parts new to hopefully fix it. I have adjusted 100s of valves and never had one fight me like this. Maybe your in the same boat?
 

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Discussion Starter · #10 ·
To be honest with you I haven't the foggiest. Unfortunately I really mean that! I'm just starting to learn about working on engines. I'm a carpenter and I've built r.c. cars, helicopters, and done some projects to my vehicles through the years but never work inside an engine. I've adjusted the valves on this 4 times so far, long story. Whatever happened happened today. The noise wasn't there when I left this morning. Or any noise for that matter and then after riding for about 10 or fifteen minutes BAM it just started. I'm going to go finish removing through valve cover now. I just wish I knew what I was looking for! I probably need to just in stall new everything but I'll check it all with the manual and my micrometer first. Thanks for posting your suggestions! Im sure I'll be back with questions if you'd be kind enough to keep an eye on me...
 

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Gladly! We all started where you are. Hopefully i can get to the bottom of this with you. Take pictures of everything. They can help alot.
 

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Discussion Starter · #12 ·
The valve cover is off and I can see nothing wrong. There's plenty of oil in there and I looked where all the surfaces touch on the cam and rockers and cannot see any one spot that looks any more shiny than anywhere else. So, as I feared, all looks normal. So now I disassemble the cam and rocker arms and check tolerances, correct? Any suggestions or tips or anything to look for that i should do? I'm going to put her to tdc an check cam chain tension next before I do anything else.
 

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Your right on the money. Exactly what i would be doing. Cam sprocket bolt hasn't come loose? Only other thing i can think of to check.
 

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I thought of that too but upon reassembling everything after reinstalling the valve cover last time I was having such a hard time getting the cable back on the decompression lever that I left it disconnected. It was and is fully forward, so not contacting anything. It was the first thing I checked once I heard the noise. A horrible ticking noise though! I'm going to reinstall the motor bracket and start it to see if that will lead me anywhere.
the decompression cable MUST BE INSTALLED !. why ?, simple, it not only decompresses the exhaust valve ?, but it also holds the lever up when not in use ?!. in other words, if the cable is not on/installed/working right ?, it allows the lever to sit there, and rap on the exhaust valve when the motor is running. if this is all good ?, then your valves were set wrong on the wrong stroke !.
 

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The valve cover is off and I can see nothing wrong. There's plenty of oil in there and I looked where all the surfaces touch on the cam and rockers and cannot see any one spot that looks any more shiny than anywhere else. So, as I feared, all looks normal. So now I disassemble the cam and rocker arms and check tolerances, correct? Any suggestions or tips or anything to look for that i should do? I'm going to put her to tdc an check cam chain tension next before I do anything else.
when you check/set/adjust the valves ?, MAKE SURE YOUR ON THE CORRECT STROKE !!, YOU DO NOT WANT TO SET THE VALVES ON THE EXHAUST STROKE !, you want to set them on the compression stroke !.
 

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Discussion Starter · #17 ·
So... I'm a dumba$$. I didn't read the instructions when putting her back together last time and I didn't use threadlocker on the cam sprocket bolts... one of them is loose. I'm hoping I didn't destroy the top end but I can't imagine that I didn't. I'm not sure if the other one is loose yet. I'll get some red threadlocker tomorrow and tighten that one down to 17lbf and then spin her around and check the other one. I can't see any metal shavings nor can I see where it was rubbing. Lord I feel stupid! I guess this how you learn but I'm going to really study up from now on before I do something. I'm hoping for the best and that the bolt had just come loose before I stopped and heard it. Thanks for your help guys. I'll post back to this thread once I get her all back together again and let you know if I lucked out or if I destroyed the top end. Geez I'm wicked mad at myself...
 

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So... I'm a dumba$$. I didn't read the instructions when putting her back together last time and I didn't use threadlocker on the cam sprocket bolts... one of them is loose. I'm hoping I didn't destroy the top end but I can't imagine that I didn't. I'm not sure if the other one is loose yet. I'll get some red threadlocker tomorrow and tighten that one down to 17lbf and then spin her around and check the other one. I can't see any metal shavings nor can I see where it was rubbing. Lord I feel stupid! I guess this how you learn but I'm going to really study up from now on before I do something. I'm hoping for the best and that the bolt had just come loose before I stopped and heard it. Thanks for your help guys. I'll post back to this thread once I get her all back together again and let you know if I lucked out or if I destroyed the top end. Geez I'm wicked mad at myself...
don't kick yourself to hard !, your not the first person that has done this ?..and you won't be the last ! ( yes..many moons ago..i too.. did this ..lol ).
 

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Dont beat yourself up! I did the same thing on a 300ex years ago. I learned my lesson since and always use red locktite and torque them to spec. Mine you could see the mark in the valve cover and still didnt hurt anything but my pride lol. Keep your head up! We have all been there bro!
 

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seeing how we are on the subject of '' whoops '' moments ?..lmao. many years ago, rebuilt a trx250 motor, tightened down the last bolt, by bud comes over, see's the cam chain tensioner guide laying on the floor, ask..where did that come from ?, was it in that motor ?..ummmm..welllll...CHIT !!!..LMAOOO.
 
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